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<title data-rh="true">Advent of Code '22 in Rust | mf</title><meta data-rh="true" name="viewport" content="width=device-width,initial-scale=1"><meta data-rh="true" name="twitter:card" content="summary_large_image"><meta data-rh="true" property="og:url" content="https://blog.mfocko.xyz/blog/aoc-2022/intro"><meta data-rh="true" name="docusaurus_locale" content="en"><meta data-rh="true" name="docusaurus_tag" content="default"><meta data-rh="true" name="docsearch:language" content="en"><meta data-rh="true" name="docsearch:docusaurus_tag" content="default"><meta data-rh="true" property="og:title" content="Advent of Code '22 in Rust | mf"><meta data-rh="true" name="description" content="Preparing for Advent of Code '22."><meta data-rh="true" property="og:description" content="Preparing for Advent of Code '22."><meta data-rh="true" property="og:type" content="article"><meta data-rh="true" property="article:published_time" content="2022-12-14T21:45:00.000Z"><meta data-rh="true" property="article:author" content="https://gitlab.com/mfocko"><meta data-rh="true" property="article:tag" content="advent-of-code,advent-of-code-2022,rust"><link data-rh="true" rel="icon" href="/img/favicon.ico"><link data-rh="true" rel="canonical" href="https://blog.mfocko.xyz/blog/aoc-2022/intro"><link data-rh="true" rel="alternate" href="https://blog.mfocko.xyz/blog/aoc-2022/intro" hreflang="en"><link data-rh="true" rel="alternate" href="https://blog.mfocko.xyz/blog/aoc-2022/intro" hreflang="x-default"><link data-rh="true" rel="preconnect" href="https://0VXRFPR4QF-dsn.algolia.net" crossorigin="anonymous"><link rel="search" type="application/opensearchdescription+xml" title="mf" href="/opensearch.xml">
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href="/blog/leetcode/sort-diagonally">Sort the matrix diagonally</a></li><li class="sidebarItem__DBe"><a class="sidebarItemLink_mo7H" href="/blog/aoc-2022/2nd-week">2nd week of Advent of Code '22 in Rust</a></li></ul></nav></aside><main class="col col--7" itemscope="" itemtype="http://schema.org/Blog"><article itemprop="blogPost" itemscope="" itemtype="http://schema.org/BlogPosting"><header><h1 class="title_f1Hy" itemprop="headline">Advent of Code '22 in Rust</h1><div class="container_mt6G margin-vert--md"><time datetime="2022-12-14T21:45:00.000Z" itemprop="datePublished">December 14, 2022</time> · <!-- -->9 min read</div><div class="margin-top--md margin-bottom--sm row"><div class="col col--6 authorCol_Hf19"><div class="avatar margin-bottom--sm"><a href="https://gitlab.com/mfocko" target="_blank" rel="noopener noreferrer" class="avatar__photo-link"><img class="avatar__photo" src="https://github.com/mfocko.png" alt="Matej Focko"></a><div class="avatar__intro" itemprop="author" itemscope="" itemtype="https://schema.org/Person"><div class="avatar__name"><a href="https://gitlab.com/mfocko" target="_blank" rel="noopener noreferrer" itemprop="url"><span itemprop="name">Matej Focko</span></a></div><small class="avatar__subtitle" itemprop="description">a.k.a. @mf</small></div></div></div></div></header><div id="__blog-post-container" class="markdown" itemprop="articleBody"><p>Let's talk about the preparations for this year's <a href="https://adventofcode.com" target="_blank" rel="noopener noreferrer"><em>Advent of Code</em></a>.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="choosing-a-language">Choosing a language<a href="#choosing-a-language" class="hash-link" aria-label="Direct link to Choosing a language" title="Direct link to Choosing a language"></a></h2><p>When choosing a language for AoC, you usually want a language that gives you a
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quick feedback which allows you to iterate quickly to the solution of the puzzle.
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One of the most common choices is Python, many people also use JavaScript or Ruby.</p><p>Given the competitive nature of the AoC and popularity among competitive programming,
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C++ might be also a very good choice. Only if you are familiar with it, I guess…</p><p>If you want a challenge, you might also choose to rotate the languages each day.
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Though I prefer to use only one language.</p><p>For this year I have been deciding between <em>Rust</em>, <em>C++</em> and <em>Pascal</em> or <em>Ada</em>.</p><p>I have tried Rust last year and have survived with it for 3 days and then gave
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up and switched to <em>Kotlin</em>, which was pretty good given it is “Java undercover”.
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I pretty much like the ideas behind Rust, I am not sure about the whole cult and
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implementation of those ideas though. After some years with C/C++, I would say
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that Rust feels <em>too safe</em> for my taste and tries to “<em>punish me</em>” even for the
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most trivial things.</p><p>C++ is a very robust, but also comes with a wide variety of options providing you
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the ability to shoot yourself in the leg. I have tried to solve few days of previous
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Advent of Code events, it was <em>relatively easy</em> to solve the problems in C++, given
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that I do not admit writing my own iterator for <code>enumerate</code>…</p><p>Pascal or Ada were meme choices :) Ada is heavily inspired by Pascal and has a
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pretty nice standard library that offers enough to be able to quickly solve some
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problems in it. However the toolkit is questionable :/</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="choosing-libraries">Choosing libraries<a href="#choosing-libraries" class="hash-link" aria-label="Direct link to Choosing libraries" title="Direct link to Choosing libraries"></a></h2><h2 class="anchor anchorWithStickyNavbar_LWe7" id="preparations-for-rust">Preparations for Rust<a href="#preparations-for-rust" class="hash-link" aria-label="Direct link to Preparations for Rust" title="Direct link to Preparations for Rust"></a></h2><p>All of the sources, later on including solutions, can be found at my
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<a href="https://gitlab.com/mfocko/advent-of-code-2022" target="_blank" rel="noopener noreferrer">GitLab</a>.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="toolkit">Toolkit<a href="#toolkit" class="hash-link" aria-label="Direct link to Toolkit" title="Direct link to Toolkit"></a></h3><p>Since we are using Rust, we are going to use a <a href="https://doc.rust-lang.org/cargo/" target="_blank" rel="noopener noreferrer">Cargo</a> and more than likely VSCode
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with <a href="https://rust-analyzer.github.io/" target="_blank" rel="noopener noreferrer"><code>rust-analyzer</code></a>. Because of my choice of libraries, we will also introduce
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a <code>.envrc</code> file that can be used by <a href="https://direnv.net/" target="_blank" rel="noopener noreferrer"><code>direnv</code></a>, which allows you to set specific
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environment variables when you enter a directory. In our case, we will use</p><div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#000000;--prism-background-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#000000"><span class="token comment" style="color:rgb(0, 128, 0)"># to show nice backtrace when using the color-eyre</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"></span><span class="token builtin class-name" style="color:rgb(38, 127, 153)">export</span><span class="token plain"> </span><span class="token assign-left variable" style="color:rgb(9, 134, 88)">RUST_BACKTRACE</span><span class="token operator" style="color:rgb(0, 0, 0)">=</span><span class="token number" style="color:rgb(9, 134, 88)">1</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"></span><span class="token comment" style="color:rgb(0, 128, 0)"># to catch logs generated by tracing</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"></span><span class="token builtin class-name" style="color:rgb(38, 127, 153)">export</span><span class="token plain"> </span><span class="token assign-left variable" style="color:rgb(9, 134, 88)">RUST_LOG</span><span class="token operator" style="color:rgb(0, 0, 0)">=</span><span class="token plain">trace</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>And for the one of the most obnoxious things ever, we will use a script to download
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the inputs instead of “<em>clicking, opening and copying to a file</em>”<sup id="fnref-1-793a30"><a href="#fn-1-793a30" class="footnote-ref">1</a></sup>. There is
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no need to be <em>fancy</em>, so we will adjust Python script by Martin<sup id="fnref-2-793a30"><a href="#fn-2-793a30" class="footnote-ref">2</a></sup>.</p><div class="language-py codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#000000;--prism-background-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-py codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#000000"><span class="token comment" style="color:rgb(0, 128, 0)">#!/usr/bin/env python3</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"></span><span class="token keyword" style="color:rgb(0, 0, 255)">import</span><span class="token plain"> datetime</span><br></span><span class="token-line" style="color:#000000"><span class="token plain"></span><span class="token keyword" style="color:rgb(0, 0, 255)">import</span><span class="token plain"> yaml</span><br></span><span class="token-line" style="color:#000000"><span class="token plain"></span><span class="token keyword" style="color:rgb(0, 0, 255)">import</span><span class="token plain"> requests</span><br></span><span class="token-line" style="color:#000000"><span class="token plain"></span><span class="token keyword" style="color:rgb(0, 0, 255)">import</span><span class="token plain"> sys</span><br></span><span class="token-line" style="color:#000000"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"></span><span class="token keyword" style="color:rgb(0, 0, 255)">def</span><span class="token plain"> </span><span class="token function" style="color:rgb(0, 0, 255)">load_config</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token punctuation" style="color:rgb(4, 81, 165)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"> </span><span class="token keyword" style="color:rgb(0, 0, 255)">with</span><span class="token plain"> </span><span class="token builtin" style="color:rgb(0, 112, 193)">open</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token string" style="color:rgb(163, 21, 21)">"env.yaml"</span><span class="token punctuation" style="color:rgb(4, 81, 165)">,</span><span class="token plain"> </span><span class="token string" style="color:rgb(163, 21, 21)">"r"</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(0, 0, 255)">as</span><span class="token plain"> f</span><span class="token punctuation" style="color:rgb(4, 81, 165)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"> js </span><span class="token operator" style="color:rgb(0, 0, 0)">=</span><span class="token plain"> yaml</span><span class="token punctuation" style="color:rgb(4, 81, 165)">.</span><span class="token plain">load</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token plain">f</span><span class="token punctuation" style="color:rgb(4, 81, 165)">,</span><span class="token plain"> Loader</span><span class="token operator" style="color:rgb(0, 0, 0)">=</span><span class="token plain">yaml</span><span class="token punctuation" style="color:rgb(4, 81, 165)">.</span><span class="token plain">Loader</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"> </span><span class="token keyword" style="color:rgb(0, 0, 255)">return</span><span class="token plain"> js</span><span class="token punctuation" style="color:rgb(4, 81, 165)">[</span><span class="token string" style="color:rgb(163, 21, 21)">"session"</span><span class="token punctuation" style="color:rgb(4, 81, 165)">]</span><span class="token punctuation" style="color:rgb(4, 81, 165)">,</span><span class="token plain"> js</span><span class="token punctuation" style="color:rgb(4, 81, 165)">[</span><span class="token string" style="color:rgb(163, 21, 21)">"year"</span><span class="token punctuation" style="color:rgb(4, 81, 165)">]</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"></span><span class="token keyword" style="color:rgb(0, 0, 255)">def</span><span class="token plain"> </span><span class="token function" style="color:rgb(0, 0, 255)">get_input</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token plain">session</span><span class="token punctuation" style="color:rgb(4, 81, 165)">,</span><span class="token plain"> year</span><span class="token punctuation" style="color:rgb(4, 81, 165)">,</span><span class="token plain"> day</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token punctuation" style="color:rgb(4, 81, 165)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"> </span><span class="token keyword" style="color:rgb(0, 0, 255)">return</span><span class="token plain"> requests</span><span class="token punctuation" style="color:rgb(4, 81, 165)">.</span><span class="token plain">get</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"> </span><span class="token string-interpolation string" style="color:rgb(163, 21, 21)">f"https://adventofcode.com/</span><span class="token string-interpolation interpolation punctuation" style="color:rgb(4, 81, 165)">{</span><span class="token string-interpolation interpolation">year</span><span class="token string-interpolation interpolation punctuation" style="color:rgb(4, 81, 165)">}</span><span class="token string-interpolation string" style="color:rgb(163, 21, 21)">/day/</span><span class="token string-interpolation interpolation punctuation" style="color:rgb(4, 81, 165)">{</span><span class="token string-interpolation interpolation">day</span><span class="token string-interpolation interpolation punctuation" style="color:rgb(4, 81, 165)">}</span><span class="token string-interpolation string" style="color:rgb(163, 21, 21)">/input"</span><span class="token punctuation" style="color:rgb(4, 81, 165)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"> cookies</span><span class="token operator" style="color:rgb(0, 0, 0)">=</span><span class="token punctuation" style="color:rgb(4, 81, 165)">{</span><span class="token string" style="color:rgb(163, 21, 21)">"session"</span><span class="token punctuation" style="color:rgb(4, 81, 165)">:</span><span class="token plain"> session</span><span class="token punctuation" style="color:rgb(4, 81, 165)">}</span><span class="token punctuation" style="color:rgb(4, 81, 165)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"> headers</span><span class="token operator" style="color:rgb(0, 0, 0)">=</span><span class="token punctuation" style="color:rgb(4, 81, 165)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"> </span><span class="token string" style="color:rgb(163, 21, 21)">"User-Agent"</span><span class="token punctuation" style="color:rgb(4, 81, 165)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(163, 21, 21)">"{repo} by {mail}"</span><span class="token punctuation" style="color:rgb(4, 81, 165)">.</span><span class="token builtin" style="color:rgb(0, 112, 193)">format</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"> repo</span><span class="token operator" style="color:rgb(0, 0, 0)">=</span><span class="token string" style="color:rgb(163, 21, 21)">"gitlab.com/mfocko/advent-of-code-2022"</span><span class="token punctuation" style="color:rgb(4, 81, 165)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"> mail</span><span class="token operator" style="color:rgb(0, 0, 0)">=</span><span class="token string" style="color:rgb(163, 21, 21)">"me@mfocko.xyz"</span><span class="token punctuation" style="color:rgb(4, 81, 165)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(4, 81, 165)">}</span><span class="token punctuation" style="color:rgb(4, 81, 165)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token punctuation" style="color:rgb(4, 81, 165)">.</span><span class="token plain">content</span><span class="token punctuation" style="color:rgb(4, 81, 165)">.</span><span class="token plain">decode</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token string" style="color:rgb(163, 21, 21)">"utf-8"</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"></span><span class="token keyword" style="color:rgb(0, 0, 255)">def</span><span class="token plain"> </span><span class="token function" style="color:rgb(0, 0, 255)">main</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token punctuation" style="color:rgb(4, 81, 165)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"> day </span><span class="token operator" style="color:rgb(0, 0, 0)">=</span><span class="token plain"> datetime</span><span class="token punctuation" style="color:rgb(4, 81, 165)">.</span><span class="token plain">datetime</span><span class="token punctuation" style="color:rgb(4, 81, 165)">.</span><span class="token plain">now</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token punctuation" style="color:rgb(4, 81, 165)">.</span><span class="token plain">day</span><br></span><span class="token-line" style="color:#000000"><span class="token plain"> </span><span class="token keyword" style="color:rgb(0, 0, 255)">if</span><span class="token plain"> </span><span class="token builtin" style="color:rgb(0, 112, 193)">len</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token plain">sys</span><span class="token punctuation" style="color:rgb(4, 81, 165)">.</span><span class="token plain">argv</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token plain"> </span><span class="token operator" style="color:rgb(0, 0, 0)">==</span><span class="token plain"> </span><span class="token number" style="color:rgb(9, 134, 88)">2</span><span class="token punctuation" style="color:rgb(4, 81, 165)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"> day </span><span class="token operator" style="color:rgb(0, 0, 0)">=</span><span class="token plain"> sys</span><span class="token punctuation" style="color:rgb(4, 81, 165)">.</span><span class="token plain">argv</span><span class="token punctuation" style="color:rgb(4, 81, 165)">[</span><span class="token number" style="color:rgb(9, 134, 88)">1</span><span class="token punctuation" style="color:rgb(4, 81, 165)">]</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"> session</span><span class="token punctuation" style="color:rgb(4, 81, 165)">,</span><span class="token plain"> year </span><span class="token operator" style="color:rgb(0, 0, 0)">=</span><span class="token plain"> load_config</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"> problem_input </span><span class="token operator" style="color:rgb(0, 0, 0)">=</span><span class="token plain"> get_input</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token plain">session</span><span class="token punctuation" style="color:rgb(4, 81, 165)">,</span><span class="token plain"> year</span><span class="token punctuation" style="color:rgb(4, 81, 165)">,</span><span class="token plain"> day</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"> </span><span class="token keyword" style="color:rgb(0, 0, 255)">with</span><span class="token plain"> </span><span class="token builtin" style="color:rgb(0, 112, 193)">open</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token string-interpolation string" style="color:rgb(163, 21, 21)">f"./inputs/day</span><span class="token string-interpolation interpolation punctuation" style="color:rgb(4, 81, 165)">{</span><span class="token string-interpolation interpolation">day</span><span class="token string-interpolation interpolation punctuation" style="color:rgb(4, 81, 165)">:</span><span class="token string-interpolation interpolation format-spec">>02</span><span class="token string-interpolation interpolation punctuation" style="color:rgb(4, 81, 165)">}</span><span class="token string-interpolation string" style="color:rgb(163, 21, 21)">.txt"</span><span class="token punctuation" style="color:rgb(4, 81, 165)">,</span><span class="token plain"> </span><span class="token string" style="color:rgb(163, 21, 21)">"w"</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(0, 0, 255)">as</span><span class="token plain"> f</span><span class="token punctuation" style="color:rgb(4, 81, 165)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"> f</span><span class="token punctuation" style="color:rgb(4, 81, 165)">.</span><span class="token plain">write</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token plain">problem_input</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"></span><span class="token keyword" style="color:rgb(0, 0, 255)">if</span><span class="token plain"> __name__ </span><span class="token operator" style="color:rgb(0, 0, 0)">==</span><span class="token plain"> </span><span class="token string" style="color:rgb(163, 21, 21)">"__main__"</span><span class="token punctuation" style="color:rgb(4, 81, 165)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"> main</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>If the script is called without any arguments, it will deduce the day from the
|
||
system, so we do not need to change the day every morning. It also requires a
|
||
configuration file:</p><div class="language-yaml codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#000000;--prism-background-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-yaml codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#000000"><span class="token comment" style="color:rgb(0, 128, 0)"># env.yaml</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"></span><span class="token key atrule">session</span><span class="token punctuation" style="color:rgb(4, 81, 165)">:</span><span class="token plain"> ‹your session cookie›</span><br></span><span class="token-line" style="color:#000000"><span class="token plain"></span><span class="token key atrule">year</span><span class="token punctuation" style="color:rgb(4, 81, 165)">:</span><span class="token plain"> </span><span class="token number" style="color:rgb(9, 134, 88)">2022</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><h3 class="anchor anchorWithStickyNavbar_LWe7" id="libraries">Libraries<a href="#libraries" class="hash-link" aria-label="Direct link to Libraries" title="Direct link to Libraries"></a></h3><p>Looking at the list of the libraries, I have chosen “a lot” of them. Let's walk
|
||
through each of them.</p><p><a href="https://crates.io/crates/tracing" target="_blank" rel="noopener noreferrer"><code>tracing</code></a> and <a href="https://crates.io/crates/tracing-subscriber" target="_blank" rel="noopener noreferrer"><code>tracing-subscriber</code></a> are the crates that can be used for tracing
|
||
and logging of your Rust programs, there are also other crates that can help you
|
||
with providing backtrace to the Sentry in case you have deployed your application
|
||
somewhere and you want to watch over it. In our use case we will just utilize the
|
||
macros for debugging in the terminal.</p><p><a href="https://crates.io/crates/thiserror" target="_blank" rel="noopener noreferrer"><code>thiserror</code></a>, <a href="https://crates.io/crates/anyhow" target="_blank" rel="noopener noreferrer"><code>anyhow</code></a> and <a href="https://crates.io/crates/color-eyre" target="_blank" rel="noopener noreferrer"><code>color-eyre</code></a> are used for error reporting.
|
||
<code>thiserror</code> is a very good choice for libraries, cause it extends the <code>Error</code>
|
||
from the <code>std</code> and allows you to create more convenient error types. Next is
|
||
<code>anyhow</code> which kinda builds on top of the <code>thiserror</code> and provides you with simpler
|
||
error handling in binaries<sup id="fnref-3-793a30"><a href="#fn-3-793a30" class="footnote-ref">3</a></sup>. And finally we have <code>color-eyre</code> which, as I found
|
||
out later, is a colorful (<em>wink wink</em>) extension of <code>eyre</code> which is fork of <code>anyhow</code>
|
||
while supporting customized reports.</p><p>In the end I have decided to remove <code>thiserror</code> and <code>anyhow</code>, since first one is
|
||
suitable for libraries and the latter was basically fully replaced by <code>{color-,}eyre</code>.</p><p><a href="https://crates.io/crates/regex" target="_blank" rel="noopener noreferrer"><code>regex</code></a> and <a href="https://crates.io/crates/lazy_static" target="_blank" rel="noopener noreferrer"><code>lazy_static</code></a> are a very good and also, I hope, self-explanatory
|
||
combination. <code>lazy_static</code> allows you to have static variables that must be initialized
|
||
during runtime.</p><p><a href="https://crates.io/crates/itertools" target="_blank" rel="noopener noreferrer"><code>itertools</code></a> provides some nice extensions to the iterators from the <code>std</code>.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="my-own-library">My own “library”<a href="#my-own-library" class="hash-link" aria-label="Direct link to My own “library”" title="Direct link to My own “library”"></a></h3><p>When creating the crate for this year's Advent of Code, I have chosen a library
|
||
type. Even though standard library is huge, some things might not be included and
|
||
also we can follow <em>KISS</em>. I have 2 modules that my “library” exports, one for
|
||
parsing and one for 2D vector (that gets used quite often during Advent of Code).</p><p>Key part is, of course, processing the input and my library exports following
|
||
functions that get used a lot:</p><div class="language-rust codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#000000;--prism-background-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-rust codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#000000"><span class="token comment" style="color:rgb(0, 128, 0)">/// Reads file to the string.</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"></span><span class="token keyword" style="color:rgb(0, 0, 255)">pub</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(0, 0, 255)">fn</span><span class="token plain"> </span><span class="token function-definition function" style="color:rgb(0, 0, 255)">file_to_string</span><span class="token operator" style="color:rgb(0, 0, 0)"><</span><span class="token class-name" style="color:rgb(38, 127, 153)">P</span><span class="token punctuation" style="color:rgb(4, 81, 165)">:</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(38, 127, 153)">AsRef</span><span class="token operator" style="color:rgb(0, 0, 0)"><</span><span class="token class-name" style="color:rgb(38, 127, 153)">Path</span><span class="token operator" style="color:rgb(0, 0, 0)">>></span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token plain">pathname</span><span class="token punctuation" style="color:rgb(4, 81, 165)">:</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(38, 127, 153)">P</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(4, 81, 165)">-></span><span class="token plain"> </span><span class="token class-name" style="color:rgb(38, 127, 153)">String</span><span class="token punctuation" style="color:rgb(4, 81, 165)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"></span><span class="token comment" style="color:rgb(0, 128, 0)">/// Reads file and returns it as a vector of characters.</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"></span><span class="token keyword" style="color:rgb(0, 0, 255)">pub</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(0, 0, 255)">fn</span><span class="token plain"> </span><span class="token function-definition function" style="color:rgb(0, 0, 255)">file_to_chars</span><span class="token operator" style="color:rgb(0, 0, 0)"><</span><span class="token class-name" style="color:rgb(38, 127, 153)">P</span><span class="token punctuation" style="color:rgb(4, 81, 165)">:</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(38, 127, 153)">AsRef</span><span class="token operator" style="color:rgb(0, 0, 0)"><</span><span class="token class-name" style="color:rgb(38, 127, 153)">Path</span><span class="token operator" style="color:rgb(0, 0, 0)">>></span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token plain">pathname</span><span class="token punctuation" style="color:rgb(4, 81, 165)">:</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(38, 127, 153)">P</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(4, 81, 165)">-></span><span class="token plain"> </span><span class="token class-name" style="color:rgb(38, 127, 153)">Vec</span><span class="token operator" style="color:rgb(0, 0, 0)"><</span><span class="token keyword" style="color:rgb(0, 0, 255)">char</span><span class="token operator" style="color:rgb(0, 0, 0)">></span><span class="token punctuation" style="color:rgb(4, 81, 165)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"></span><span class="token comment" style="color:rgb(0, 128, 0)">/// Reads file and returns a vector of parsed structures. Expects each structure</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"></span><span class="token comment" style="color:rgb(0, 128, 0)">/// on its own line in the file. And `T` needs to implement `FromStr` trait.</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"></span><span class="token keyword" style="color:rgb(0, 0, 255)">pub</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(0, 0, 255)">fn</span><span class="token plain"> </span><span class="token function-definition function" style="color:rgb(0, 0, 255)">file_to_structs</span><span class="token operator" style="color:rgb(0, 0, 0)"><</span><span class="token class-name" style="color:rgb(38, 127, 153)">P</span><span class="token punctuation" style="color:rgb(4, 81, 165)">:</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(38, 127, 153)">AsRef</span><span class="token operator" style="color:rgb(0, 0, 0)"><</span><span class="token class-name" style="color:rgb(38, 127, 153)">Path</span><span class="token operator" style="color:rgb(0, 0, 0)">></span><span class="token punctuation" style="color:rgb(4, 81, 165)">,</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(38, 127, 153)">T</span><span class="token punctuation" style="color:rgb(4, 81, 165)">:</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(38, 127, 153)">FromStr</span><span class="token operator" style="color:rgb(0, 0, 0)">></span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token plain">pathname</span><span class="token punctuation" style="color:rgb(4, 81, 165)">:</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(38, 127, 153)">P</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(4, 81, 165)">-></span><span class="token plain"> </span><span class="token class-name" style="color:rgb(38, 127, 153)">Vec</span><span class="token operator" style="color:rgb(0, 0, 0)"><</span><span class="token class-name" style="color:rgb(38, 127, 153)">T</span><span class="token operator" style="color:rgb(0, 0, 0)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"></span><span class="token keyword" style="color:rgb(0, 0, 255)">where</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"> </span><span class="token operator" style="color:rgb(0, 0, 0)"><</span><span class="token class-name" style="color:rgb(38, 127, 153)">T</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(0, 0, 255)">as</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(38, 127, 153)">FromStr</span><span class="token operator" style="color:rgb(0, 0, 0)">></span><span class="token punctuation" style="color:rgb(4, 81, 165)">::</span><span class="token class-name" style="color:rgb(38, 127, 153)">Err</span><span class="token punctuation" style="color:rgb(4, 81, 165)">:</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(38, 127, 153)">Debug</span><span class="token punctuation" style="color:rgb(4, 81, 165)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"></span><span class="token comment" style="color:rgb(0, 128, 0)">/// Converts iterator over strings to a vector of parsed structures. `T` needs</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"></span><span class="token comment" style="color:rgb(0, 128, 0)">/// to implement `FromStr` trait and its error must derive `Debug` trait.</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"></span><span class="token keyword" style="color:rgb(0, 0, 255)">pub</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(0, 0, 255)">fn</span><span class="token plain"> </span><span class="token function-definition function" style="color:rgb(0, 0, 255)">strings_to_structs</span><span class="token operator" style="color:rgb(0, 0, 0)"><</span><span class="token class-name" style="color:rgb(38, 127, 153)">T</span><span class="token punctuation" style="color:rgb(4, 81, 165)">:</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(38, 127, 153)">FromStr</span><span class="token punctuation" style="color:rgb(4, 81, 165)">,</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(38, 127, 153)">U</span><span class="token operator" style="color:rgb(0, 0, 0)">></span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"> iter</span><span class="token punctuation" style="color:rgb(4, 81, 165)">:</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(0, 0, 255)">impl</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(38, 127, 153)">Iterator</span><span class="token operator" style="color:rgb(0, 0, 0)"><</span><span class="token class-name" style="color:rgb(38, 127, 153)">Item</span><span class="token plain"> </span><span class="token operator" style="color:rgb(0, 0, 0)">=</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(38, 127, 153)">U</span><span class="token operator" style="color:rgb(0, 0, 0)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"></span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(4, 81, 165)">-></span><span class="token plain"> </span><span class="token class-name" style="color:rgb(38, 127, 153)">Vec</span><span class="token operator" style="color:rgb(0, 0, 0)"><</span><span class="token class-name" style="color:rgb(38, 127, 153)">T</span><span class="token operator" style="color:rgb(0, 0, 0)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"></span><span class="token keyword" style="color:rgb(0, 0, 255)">where</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"> </span><span class="token operator" style="color:rgb(0, 0, 0)"><</span><span class="token class-name" style="color:rgb(38, 127, 153)">T</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(0, 0, 255)">as</span><span class="token plain"> </span><span class="token namespace">std</span><span class="token namespace punctuation" style="color:rgb(4, 81, 165)">::</span><span class="token keyword" style="color:rgb(0, 0, 255)">str</span><span class="token punctuation" style="color:rgb(4, 81, 165)">::</span><span class="token class-name" style="color:rgb(38, 127, 153)">FromStr</span><span class="token operator" style="color:rgb(0, 0, 0)">></span><span class="token punctuation" style="color:rgb(4, 81, 165)">::</span><span class="token class-name" style="color:rgb(38, 127, 153)">Err</span><span class="token punctuation" style="color:rgb(4, 81, 165)">:</span><span class="token plain"> </span><span class="token namespace">std</span><span class="token namespace punctuation" style="color:rgb(4, 81, 165)">::</span><span class="token namespace">fmt</span><span class="token namespace punctuation" style="color:rgb(4, 81, 165)">::</span><span class="token class-name" style="color:rgb(38, 127, 153)">Debug</span><span class="token punctuation" style="color:rgb(4, 81, 165)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"> </span><span class="token class-name" style="color:rgb(38, 127, 153)">U</span><span class="token punctuation" style="color:rgb(4, 81, 165)">:</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(38, 127, 153)">Deref</span><span class="token operator" style="color:rgb(0, 0, 0)"><</span><span class="token class-name" style="color:rgb(38, 127, 153)">Target</span><span class="token plain"> </span><span class="token operator" style="color:rgb(0, 0, 0)">=</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(0, 0, 255)">str</span><span class="token operator" style="color:rgb(0, 0, 0)">></span><span class="token punctuation" style="color:rgb(4, 81, 165)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"></span><span class="token comment" style="color:rgb(0, 128, 0)">/// Reads file and returns it as a vector of its lines.</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"></span><span class="token keyword" style="color:rgb(0, 0, 255)">pub</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(0, 0, 255)">fn</span><span class="token plain"> </span><span class="token function-definition function" style="color:rgb(0, 0, 255)">file_to_lines</span><span class="token operator" style="color:rgb(0, 0, 0)"><</span><span class="token class-name" style="color:rgb(38, 127, 153)">P</span><span class="token punctuation" style="color:rgb(4, 81, 165)">:</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(38, 127, 153)">AsRef</span><span class="token operator" style="color:rgb(0, 0, 0)"><</span><span class="token class-name" style="color:rgb(38, 127, 153)">Path</span><span class="token operator" style="color:rgb(0, 0, 0)">>></span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token plain">pathname</span><span class="token punctuation" style="color:rgb(4, 81, 165)">:</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(38, 127, 153)">P</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(4, 81, 165)">-></span><span class="token plain"> </span><span class="token class-name" style="color:rgb(38, 127, 153)">Vec</span><span class="token operator" style="color:rgb(0, 0, 0)"><</span><span class="token class-name" style="color:rgb(38, 127, 153)">String</span><span class="token operator" style="color:rgb(0, 0, 0)">></span><span class="token punctuation" style="color:rgb(4, 81, 165)">;</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>As for the vector, I went with a rather simple implementation that allows only
|
||
addition of the vectors for now and accessing the elements via functions <code>x()</code>
|
||
and <code>y()</code>. Also the vector is generic, so we can use it with any numeric type we
|
||
need.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="skeleton">Skeleton<a href="#skeleton" class="hash-link" aria-label="Direct link to Skeleton" title="Direct link to Skeleton"></a></h3><p>We can also prepare a template to quickly bootstrap each of the days. We know
|
||
that each puzzle has 2 parts, which means that we can start with 2 functions that
|
||
will solve them.</p><div class="language-rust codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#000000;--prism-background-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-rust codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#000000"><span class="token keyword" style="color:rgb(0, 0, 255)">fn</span><span class="token plain"> </span><span class="token function-definition function" style="color:rgb(0, 0, 255)">part1</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token plain">input</span><span class="token punctuation" style="color:rgb(4, 81, 165)">:</span><span class="token plain"> </span><span class="token operator" style="color:rgb(0, 0, 0)">&</span><span class="token class-name" style="color:rgb(38, 127, 153)">Input</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(4, 81, 165)">-></span><span class="token plain"> </span><span class="token class-name" style="color:rgb(38, 127, 153)">Output</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(4, 81, 165)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"> </span><span class="token macro property">todo!</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"></span><span class="token punctuation" style="color:rgb(4, 81, 165)">}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"></span><span class="token keyword" style="color:rgb(0, 0, 255)">fn</span><span class="token plain"> </span><span class="token function-definition function" style="color:rgb(0, 0, 255)">part2</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token plain">input</span><span class="token punctuation" style="color:rgb(4, 81, 165)">:</span><span class="token plain"> </span><span class="token operator" style="color:rgb(0, 0, 0)">&</span><span class="token class-name" style="color:rgb(38, 127, 153)">Input</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(4, 81, 165)">-></span><span class="token plain"> </span><span class="token class-name" style="color:rgb(38, 127, 153)">Output</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(4, 81, 165)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"> </span><span class="token macro property">todo!</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"></span><span class="token punctuation" style="color:rgb(4, 81, 165)">}</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>Both functions take reference to the input and return some output (in majority
|
||
of puzzles, it is the same type). <code>todo!()</code> can be used as a nice placeholder,
|
||
it also causes a panic when reached and we could also provide some string with
|
||
an explanation, e.g. <code>todo!("part 1")</code>. We have not given functions a specific
|
||
type and to avoid as much copy-paste as possible, we will introduce type aliases.</p><div class="language-rust codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#000000;--prism-background-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-rust codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#000000"><span class="token keyword" style="color:rgb(0, 0, 255)">type</span><span class="token plain"> </span><span class="token type-definition class-name" style="color:rgb(38, 127, 153)">Input</span><span class="token plain"> </span><span class="token operator" style="color:rgb(0, 0, 0)">=</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(38, 127, 153)">String</span><span class="token punctuation" style="color:rgb(4, 81, 165)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"></span><span class="token keyword" style="color:rgb(0, 0, 255)">type</span><span class="token plain"> </span><span class="token type-definition class-name" style="color:rgb(38, 127, 153)">Output</span><span class="token plain"> </span><span class="token operator" style="color:rgb(0, 0, 0)">=</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(0, 0, 255)">i32</span><span class="token punctuation" style="color:rgb(4, 81, 165)">;</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><div class="theme-admonition theme-admonition-tip alert alert--success admonition_LlT9"><div class="admonitionHeading_tbUL"><span class="admonitionIcon_kALy"><svg viewBox="0 0 12 16"><path fill-rule="evenodd" d="M6.5 0C3.48 0 1 2.19 1 5c0 .92.55 2.25 1 3 1.34 2.25 1.78 2.78 2 4v1h5v-1c.22-1.22.66-1.75 2-4 .45-.75 1-2.08 1-3 0-2.81-2.48-5-5.5-5zm3.64 7.48c-.25.44-.47.8-.67 1.11-.86 1.41-1.25 2.06-1.45 3.23-.02.05-.02.11-.02.17H5c0-.06 0-.13-.02-.17-.2-1.17-.59-1.83-1.45-3.23-.2-.31-.42-.67-.67-1.11C2.44 6.78 2 5.65 2 5c0-2.2 2.02-4 4.5-4 1.22 0 2.36.42 3.22 1.19C10.55 2.94 11 3.94 11 5c0 .66-.44 1.78-.86 2.48zM4 14h5c-.23 1.14-1.3 2-2.5 2s-2.27-.86-2.5-2z"></path></svg></span>tip</div><div class="admonitionContent_S0QG"><p>This allows us to quickly adjust the types only in one place without the need to
|
||
do <em>regex-replace</em> or replace them manually.</p></div></div><p>For each day we get a personalized input that is provided as a text file. Almost
|
||
all the time, we would like to get some structured type out of that input, and
|
||
therefore it makes sense to introduce a new function that will provide the parsing
|
||
of the input.</p><div class="language-rust codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#000000;--prism-background-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-rust codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#000000"><span class="token keyword" style="color:rgb(0, 0, 255)">fn</span><span class="token plain"> </span><span class="token function-definition function" style="color:rgb(0, 0, 255)">parse_input</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token plain">path</span><span class="token punctuation" style="color:rgb(4, 81, 165)">:</span><span class="token plain"> </span><span class="token operator" style="color:rgb(0, 0, 0)">&</span><span class="token keyword" style="color:rgb(0, 0, 255)">str</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(4, 81, 165)">-></span><span class="token plain"> </span><span class="token class-name" style="color:rgb(38, 127, 153)">Input</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(4, 81, 165)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"> </span><span class="token macro property">todo!</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"></span><span class="token punctuation" style="color:rgb(4, 81, 165)">}</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>This “parser” will take a path to the file, just in case we would like to run the
|
||
sample instead of input.</p><p>OK, so now we can write a <code>main</code> function that will take all of the pieces and
|
||
run them.</p><div class="language-rust codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#000000;--prism-background-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-rust codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#000000"><span class="token keyword" style="color:rgb(0, 0, 255)">fn</span><span class="token plain"> </span><span class="token function-definition function" style="color:rgb(0, 0, 255)">main</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(4, 81, 165)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"> </span><span class="token keyword" style="color:rgb(0, 0, 255)">let</span><span class="token plain"> input </span><span class="token operator" style="color:rgb(0, 0, 0)">=</span><span class="token plain"> </span><span class="token function" style="color:rgb(0, 0, 255)">parse_input</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token string" style="color:rgb(163, 21, 21)">"inputs/dayXX.txt"</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token punctuation" style="color:rgb(4, 81, 165)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"> </span><span class="token macro property">println!</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token string" style="color:rgb(163, 21, 21)">"Part 1: {}"</span><span class="token punctuation" style="color:rgb(4, 81, 165)">,</span><span class="token plain"> </span><span class="token function" style="color:rgb(0, 0, 255)">part_1</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token operator" style="color:rgb(0, 0, 0)">&</span><span class="token plain">input</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token punctuation" style="color:rgb(4, 81, 165)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"> </span><span class="token macro property">println!</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token string" style="color:rgb(163, 21, 21)">"Part 2: {}"</span><span class="token punctuation" style="color:rgb(4, 81, 165)">,</span><span class="token plain"> </span><span class="token function" style="color:rgb(0, 0, 255)">part_2</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token operator" style="color:rgb(0, 0, 0)">&</span><span class="token plain">input</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token punctuation" style="color:rgb(4, 81, 165)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"></span><span class="token punctuation" style="color:rgb(4, 81, 165)">}</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>This would definitely do :) But we have installed a few libraries and we want to
|
||
use them. In this part we are going to utilize <em><a href="https://crates.io/crates/tracing" target="_blank" rel="noopener noreferrer"><code>tracing</code></a></em> (for tracing, duh…)
|
||
and <em><a href="https://crates.io/crates/color-eyre" target="_blank" rel="noopener noreferrer"><code>color-eyre</code></a></em> (for better error reporting, e.g. from parsing).</p><div class="language-rust codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#000000;--prism-background-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-rust codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#000000"><span class="token keyword" style="color:rgb(0, 0, 255)">fn</span><span class="token plain"> </span><span class="token function-definition function" style="color:rgb(0, 0, 255)">main</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(4, 81, 165)">-></span><span class="token plain"> </span><span class="token class-name" style="color:rgb(38, 127, 153)">Result</span><span class="token operator" style="color:rgb(0, 0, 0)"><</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token operator" style="color:rgb(0, 0, 0)">></span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(4, 81, 165)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"> </span><span class="token namespace">tracing_subscriber</span><span class="token namespace punctuation" style="color:rgb(4, 81, 165)">::</span><span class="token function" style="color:rgb(0, 0, 255)">fmt</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(4, 81, 165)">.</span><span class="token function" style="color:rgb(0, 0, 255)">with_env_filter</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token class-name" style="color:rgb(38, 127, 153)">EnvFilter</span><span class="token punctuation" style="color:rgb(4, 81, 165)">::</span><span class="token function" style="color:rgb(0, 0, 255)">from_default_env</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(4, 81, 165)">.</span><span class="token function" style="color:rgb(0, 0, 255)">with_target</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token boolean">false</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(4, 81, 165)">.</span><span class="token function" style="color:rgb(0, 0, 255)">with_file</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token boolean">true</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(4, 81, 165)">.</span><span class="token function" style="color:rgb(0, 0, 255)">with_line_number</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token boolean">true</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(4, 81, 165)">.</span><span class="token function" style="color:rgb(0, 0, 255)">without_time</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(4, 81, 165)">.</span><span class="token function" style="color:rgb(0, 0, 255)">compact</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(4, 81, 165)">.</span><span class="token function" style="color:rgb(0, 0, 255)">init</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token punctuation" style="color:rgb(4, 81, 165)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"> </span><span class="token namespace">color_eyre</span><span class="token namespace punctuation" style="color:rgb(4, 81, 165)">::</span><span class="token function" style="color:rgb(0, 0, 255)">install</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token operator" style="color:rgb(0, 0, 0)">?</span><span class="token punctuation" style="color:rgb(4, 81, 165)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"> </span><span class="token keyword" style="color:rgb(0, 0, 255)">let</span><span class="token plain"> input </span><span class="token operator" style="color:rgb(0, 0, 0)">=</span><span class="token plain"> </span><span class="token function" style="color:rgb(0, 0, 255)">parse_input</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token string" style="color:rgb(163, 21, 21)">"inputs/dayXX.txt"</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token punctuation" style="color:rgb(4, 81, 165)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"> </span><span class="token macro property">info!</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token string" style="color:rgb(163, 21, 21)">"Part 1: {}"</span><span class="token punctuation" style="color:rgb(4, 81, 165)">,</span><span class="token plain"> </span><span class="token function" style="color:rgb(0, 0, 255)">part_1</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token operator" style="color:rgb(0, 0, 0)">&</span><span class="token plain">input</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token punctuation" style="color:rgb(4, 81, 165)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"> </span><span class="token macro property">info!</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token string" style="color:rgb(163, 21, 21)">"Part 2: {}"</span><span class="token punctuation" style="color:rgb(4, 81, 165)">,</span><span class="token plain"> </span><span class="token function" style="color:rgb(0, 0, 255)">part_2</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token operator" style="color:rgb(0, 0, 0)">&</span><span class="token plain">input</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token punctuation" style="color:rgb(4, 81, 165)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"> </span><span class="token class-name" style="color:rgb(38, 127, 153)">Ok</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"></span><span class="token punctuation" style="color:rgb(4, 81, 165)">}</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>The first statement will set up tracing and configure it to print out the logs to
|
||
terminal, based on the environment variable. We also change the formatting a bit,
|
||
since we do not need all the <em>fancy</em> features of the logger. Pure initialization
|
||
would get us logs like this:</p><div class="codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#000000;--prism-background-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-text codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#000000"><span class="token plain">2022-12-11T19:53:19.975343Z INFO day01: Part 1: 0</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>However after running that command, we will get the following:</p><div class="codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#000000;--prism-background-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-text codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#000000"><span class="token plain"> INFO src/bin/day01.rs:35: Part 1: 0</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>And the <code>color_eyre::install()?</code> is quite straightforward. We just initialize the
|
||
error reporting by <em>color eyre</em>.</p><div class="theme-admonition theme-admonition-caution alert alert--warning admonition_LlT9"><div class="admonitionHeading_tbUL"><span class="admonitionIcon_kALy"><svg viewBox="0 0 16 16"><path fill-rule="evenodd" d="M8.893 1.5c-.183-.31-.52-.5-.887-.5s-.703.19-.886.5L.138 13.499a.98.98 0 0 0 0 1.001c.193.31.53.501.886.501h13.964c.367 0 .704-.19.877-.5a1.03 1.03 0 0 0 .01-1.002L8.893 1.5zm.133 11.497H6.987v-2.003h2.039v2.003zm0-3.004H6.987V5.987h2.039v4.006z"></path></svg></span>caution</div><div class="admonitionContent_S0QG"><p>Notice that we had to add <code>Ok(())</code> to the end of the function and adjust the
|
||
return type of the <code>main</code> to <code>Result<()></code>. It is caused by the <em>color eyre</em> that
|
||
can be installed only once and therefore it can fail, that is how we got the <code>?</code>
|
||
at the end of the <code>::install</code> which <em>unwraps</em> the <strong>»result«</strong> of the installation.</p></div></div><p>Overall we will get to a template like this:</p><div class="language-rust codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#000000;--prism-background-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-rust codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#000000"><span class="token keyword" style="color:rgb(0, 0, 255)">use</span><span class="token plain"> </span><span class="token namespace">aoc_2022</span><span class="token namespace punctuation" style="color:rgb(4, 81, 165)">::</span><span class="token operator" style="color:rgb(0, 0, 0)">*</span><span class="token punctuation" style="color:rgb(4, 81, 165)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"></span><span class="token keyword" style="color:rgb(0, 0, 255)">use</span><span class="token plain"> </span><span class="token namespace">color_eyre</span><span class="token namespace punctuation" style="color:rgb(4, 81, 165)">::</span><span class="token namespace">eyre</span><span class="token namespace punctuation" style="color:rgb(4, 81, 165)">::</span><span class="token class-name" style="color:rgb(38, 127, 153)">Result</span><span class="token punctuation" style="color:rgb(4, 81, 165)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"></span><span class="token keyword" style="color:rgb(0, 0, 255)">use</span><span class="token plain"> </span><span class="token namespace">tracing</span><span class="token namespace punctuation" style="color:rgb(4, 81, 165)">::</span><span class="token plain">info</span><span class="token punctuation" style="color:rgb(4, 81, 165)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"></span><span class="token keyword" style="color:rgb(0, 0, 255)">use</span><span class="token plain"> </span><span class="token namespace">tracing_subscriber</span><span class="token namespace punctuation" style="color:rgb(4, 81, 165)">::</span><span class="token class-name" style="color:rgb(38, 127, 153)">EnvFilter</span><span class="token punctuation" style="color:rgb(4, 81, 165)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"></span><span class="token keyword" style="color:rgb(0, 0, 255)">type</span><span class="token plain"> </span><span class="token type-definition class-name" style="color:rgb(38, 127, 153)">Input</span><span class="token plain"> </span><span class="token operator" style="color:rgb(0, 0, 0)">=</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(38, 127, 153)">String</span><span class="token punctuation" style="color:rgb(4, 81, 165)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"></span><span class="token keyword" style="color:rgb(0, 0, 255)">type</span><span class="token plain"> </span><span class="token type-definition class-name" style="color:rgb(38, 127, 153)">Output</span><span class="token plain"> </span><span class="token operator" style="color:rgb(0, 0, 0)">=</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(0, 0, 255)">i32</span><span class="token punctuation" style="color:rgb(4, 81, 165)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"></span><span class="token keyword" style="color:rgb(0, 0, 255)">fn</span><span class="token plain"> </span><span class="token function-definition function" style="color:rgb(0, 0, 255)">parse_input</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token plain">path</span><span class="token punctuation" style="color:rgb(4, 81, 165)">:</span><span class="token plain"> </span><span class="token operator" style="color:rgb(0, 0, 0)">&</span><span class="token keyword" style="color:rgb(0, 0, 255)">str</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(4, 81, 165)">-></span><span class="token plain"> </span><span class="token class-name" style="color:rgb(38, 127, 153)">Input</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(4, 81, 165)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"> </span><span class="token macro property">todo!</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"></span><span class="token punctuation" style="color:rgb(4, 81, 165)">}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"></span><span class="token keyword" style="color:rgb(0, 0, 255)">fn</span><span class="token plain"> </span><span class="token function-definition function" style="color:rgb(0, 0, 255)">part1</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token plain">input</span><span class="token punctuation" style="color:rgb(4, 81, 165)">:</span><span class="token plain"> </span><span class="token operator" style="color:rgb(0, 0, 0)">&</span><span class="token class-name" style="color:rgb(38, 127, 153)">Input</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(4, 81, 165)">-></span><span class="token plain"> </span><span class="token class-name" style="color:rgb(38, 127, 153)">Output</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(4, 81, 165)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"> </span><span class="token macro property">todo!</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"></span><span class="token punctuation" style="color:rgb(4, 81, 165)">}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"></span><span class="token keyword" style="color:rgb(0, 0, 255)">fn</span><span class="token plain"> </span><span class="token function-definition function" style="color:rgb(0, 0, 255)">part2</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token plain">input</span><span class="token punctuation" style="color:rgb(4, 81, 165)">:</span><span class="token plain"> </span><span class="token operator" style="color:rgb(0, 0, 0)">&</span><span class="token class-name" style="color:rgb(38, 127, 153)">Input</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(4, 81, 165)">-></span><span class="token plain"> </span><span class="token class-name" style="color:rgb(38, 127, 153)">Output</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(4, 81, 165)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"> </span><span class="token macro property">todo!</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"></span><span class="token punctuation" style="color:rgb(4, 81, 165)">}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"></span><span class="token keyword" style="color:rgb(0, 0, 255)">fn</span><span class="token plain"> </span><span class="token function-definition function" style="color:rgb(0, 0, 255)">main</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(4, 81, 165)">-></span><span class="token plain"> </span><span class="token class-name" style="color:rgb(38, 127, 153)">Result</span><span class="token operator" style="color:rgb(0, 0, 0)"><</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token operator" style="color:rgb(0, 0, 0)">></span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(4, 81, 165)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"> </span><span class="token namespace">tracing_subscriber</span><span class="token namespace punctuation" style="color:rgb(4, 81, 165)">::</span><span class="token function" style="color:rgb(0, 0, 255)">fmt</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(4, 81, 165)">.</span><span class="token function" style="color:rgb(0, 0, 255)">with_env_filter</span><span class="token punctuation" style="color:rgb(4, 81, 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style="color:#000000"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(4, 81, 165)">.</span><span class="token function" style="color:rgb(0, 0, 255)">with_file</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token boolean">true</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(4, 81, 165)">.</span><span class="token function" style="color:rgb(0, 0, 255)">with_line_number</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token boolean">true</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(4, 81, 165)">.</span><span class="token function" style="color:rgb(0, 0, 255)">without_time</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(4, 81, 165)">.</span><span class="token function" style="color:rgb(0, 0, 255)">compact</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(4, 81, 165)">.</span><span class="token function" style="color:rgb(0, 0, 255)">init</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token punctuation" style="color:rgb(4, 81, 165)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"> </span><span class="token namespace">color_eyre</span><span class="token namespace punctuation" style="color:rgb(4, 81, 165)">::</span><span class="token function" style="color:rgb(0, 0, 255)">install</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token operator" style="color:rgb(0, 0, 0)">?</span><span class="token punctuation" style="color:rgb(4, 81, 165)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"> </span><span class="token keyword" style="color:rgb(0, 0, 255)">let</span><span class="token plain"> input </span><span class="token operator" style="color:rgb(0, 0, 0)">=</span><span class="token plain"> </span><span class="token function" style="color:rgb(0, 0, 255)">parse_input</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token string" style="color:rgb(163, 21, 21)">"inputs/dayXX.txt"</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token punctuation" style="color:rgb(4, 81, 165)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"> </span><span class="token macro property">info!</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token string" style="color:rgb(163, 21, 21)">"Part 1: {}"</span><span class="token punctuation" style="color:rgb(4, 81, 165)">,</span><span class="token plain"> </span><span class="token function" style="color:rgb(0, 0, 255)">part_1</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token operator" style="color:rgb(0, 0, 0)">&</span><span class="token plain">input</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token punctuation" style="color:rgb(4, 81, 165)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"> </span><span class="token macro property">info!</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token string" style="color:rgb(163, 21, 21)">"Part 2: {}"</span><span class="token punctuation" style="color:rgb(4, 81, 165)">,</span><span class="token plain"> </span><span class="token function" style="color:rgb(0, 0, 255)">part_2</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token operator" style="color:rgb(0, 0, 0)">&</span><span class="token plain">input</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token punctuation" style="color:rgb(4, 81, 165)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"> </span><span class="token class-name" style="color:rgb(38, 127, 153)">Ok</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#000000"><span class="token plain"></span><span class="token punctuation" style="color:rgb(4, 81, 165)">}</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><div class="footnotes"><hr><ol><li id="fn-1-793a30">Copy-pasting might be a relaxing thing to do, but you can also discover
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nasty stuff about your PC. See <a href="https://www.reddit.com/r/adventofcode/comments/zb98pn/comment/iyq0ono" target="_blank" rel="noopener noreferrer">this Reddit post and the comment</a>.<a href="#fnref-1-793a30" class="footnote-backref">↩</a></li><li id="fn-2-793a30"><a href="https://github.com/martinjonas" target="_blank" rel="noopener noreferrer">GitHub profile</a><a href="#fnref-2-793a30" class="footnote-backref">↩</a></li><li id="fn-3-793a30">Even though you can use it even for libraries, but handling errors from
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libraries using <code>anyhow</code> is nasty… You will be the stinky one ;)<a href="#fnref-3-793a30" class="footnote-backref">↩</a></li></ol></div></div><footer class="row docusaurus-mt-lg blogPostFooterDetailsFull_mRVl"><div class="col"><b>Tags:</b><ul class="tags_jXut padding--none margin-left--sm"><li class="tag_QGVx"><a class="tag_zVej tagRegular_sFm0" href="/blog/tags/advent-of-code">advent-of-code</a></li><li class="tag_QGVx"><a class="tag_zVej tagRegular_sFm0" href="/blog/tags/advent-of-code-2022">advent-of-code-2022</a></li><li class="tag_QGVx"><a class="tag_zVej tagRegular_sFm0" href="/blog/tags/rust">rust</a></li></ul></div><div class="col margin-top--sm"><a href="https://gitlab.com/mfocko/blog/tree/main/blog/aoc-2022/00-intro.md" target="_blank" rel="noreferrer noopener" class="theme-edit-this-page"><svg fill="currentColor" height="20" width="20" viewBox="0 0 40 40" class="iconEdit_Z9Sw" aria-hidden="true"><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 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toc-highlight">Toolkit</a></li><li><a href="#libraries" class="table-of-contents__link toc-highlight">Libraries</a></li><li><a href="#my-own-library" class="table-of-contents__link toc-highlight">My own “library”</a></li><li><a href="#skeleton" class="table-of-contents__link toc-highlight">Skeleton</a></li></ul></li></ul></div></div></div></div></div><footer class="footer footer--dark"><div class="container container-fluid"><div class="row footer__links"><div class="col footer__col"><div class="footer__title">Git</div><ul class="footer__items clean-list"><li class="footer__item"><a href="https://github.com/mfocko" target="_blank" rel="noopener noreferrer" class="footer__link-item">GitHub<svg width="13.5" height="13.5" aria-hidden="true" viewBox="0 0 24 24" class="iconExternalLink_nPIU"><path fill="currentColor" d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z"></path></svg></a></li><li class="footer__item"><a 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