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Amy de Buitléir
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5 changed files with 100 additions and 69 deletions
13
index.html
13
index.html
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@ -4766,8 +4766,8 @@ However, you can use any of the flake reference styles defined in <a href="#flak
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<span class="hll"> hello-flake<span class="tok-o">.</span><span class="tok-ss">url</span> <span class="tok-o">=</span> <span class="tok-s2">"git+https://codeberg.org/mhwombat/hello-flake"</span><span class="tok-p">;</span>
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</span> <span class="tok-p">};</span>
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<span class="tok-ss">outputs</span> <span class="tok-o">=</span> <span class="tok-p">{</span> self<span class="tok-p">,</span> nixpkgs<span class="tok-p">,</span> flake-utils<span class="tok-p">,</span> hello-flake <span class="tok-p">}:</span>
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flake-utils<span class="tok-o">.</span>lib<span class="tok-o">.</span>eachDefaultSystem <span class="tok-p">(</span>system<span class="tok-p">:</span>
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<span class="hll"> <span class="tok-ss">outputs</span> <span class="tok-o">=</span> <span class="tok-p">{</span> self<span class="tok-p">,</span> nixpkgs<span class="tok-p">,</span> flake-utils<span class="tok-p">,</span> hello-flake <span class="tok-p">}:</span>
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</span> flake-utils<span class="tok-o">.</span>lib<span class="tok-o">.</span>eachDefaultSystem <span class="tok-p">(</span>system<span class="tok-p">:</span>
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<span class="tok-k">let</span>
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<span class="tok-ss">pkgs</span> <span class="tok-o">=</span> <span class="tok-nb">import</span> nixpkgs <span class="tok-p">{</span> <span class="tok-k">inherit</span> system<span class="tok-p">;</span> <span class="tok-p">};</span>
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<span class="tok-k">in</span>
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@ -4784,6 +4784,11 @@ However, you can use any of the flake reference styles defined in <a href="#flak
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</div>
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</div>
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<div class="paragraph">
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<p>Line 5 adds <code>hello-flake</code> as an input to this flake.
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Line 8 allows the output function to reference <code>hello-flake</code>.
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Line 16 adds <code>hello-flake</code> as a build input for this flake.</p>
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</div>
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<div class="paragraph">
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<p>Let’s take a closer look at the <code>buildInputs</code> expression from line 16.</p>
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</div>
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<div class="literalblock">
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@ -4803,7 +4808,7 @@ and the last part is the name of the package or app we want.
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<div class="literalblock">
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<div class="content">
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<pre class="nowrap">$ hello-flake # Fails; dependency not available
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bash: line 31: hello-flake: command not found
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bash: line 35: hello-flake: command not found
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$ nix develop
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$ hello-flake # Works in development environment
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Hello from your flake!</pre>
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@ -5633,7 +5638,7 @@ Hello from your flake!</pre>
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</div>
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<div id="footer">
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<div id="footer-text">
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Last updated 2025-09-15 17:54:57 IST
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Last updated 2025-09-15 18:02:04 IST
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</div>
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</div>
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</body>
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@ -21,12 +21,17 @@ it's usually more convenient to use `haskell-flake` as described in <<#haskell-f
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together with the _high-level workflow_ described in <<_development_workflows>>.
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====
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[source,nix,linenums,highlight='11,16']
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[source,nix,linenums,highlight='5,8,12,17']
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.flake.nix
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....
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include::flake.nix[]
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....
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Line 5 adds `pandoc-columns` as an input to this flake.
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Line 8 allows the output function to reference `pandoc-columns`.
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Line 12 makes a custom GHC that knows about `pandoc-columns`,
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and line 17 uses the custom GHC as a build input for this flake.
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Here's a short Haskell program that uses it.
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[source,haskell,linenums]
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6
source/recipes/devshell/haskell-pkg/tempwork/Main.hs
Normal file
6
source/recipes/devshell/haskell-pkg/tempwork/Main.hs
Normal file
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@ -0,0 +1,6 @@
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import Text.Pandoc.Filters.Columns
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main :: IO ()
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main = do
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putStrLn "Prove we have access to the pandoc-columns package"
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print $ defaultColSpec
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@ -1,5 +1,23 @@
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{
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"nodes": {
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"flake-parts": {
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"inputs": {
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"nixpkgs-lib": "nixpkgs-lib"
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},
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"locked": {
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"lastModified": 1756770412,
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"narHash": "sha256-+uWLQZccFHwqpGqr2Yt5VsW/PbeJVTn9Dk6SHWhNRPw=",
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"owner": "hercules-ci",
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"repo": "flake-parts",
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"rev": "4524271976b625a4a605beefd893f270620fd751",
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"type": "github"
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},
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"original": {
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"owner": "hercules-ci",
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"repo": "flake-parts",
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"type": "github"
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}
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},
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"flake-utils": {
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"inputs": {
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"systems": "systems"
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@ -18,59 +36,22 @@
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"type": "github"
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}
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},
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"flake-utils_2": {
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"inputs": {
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"systems": "systems_2"
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},
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"haskell-flake": {
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"locked": {
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"lastModified": 1731533236,
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"narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
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"owner": "numtide",
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"repo": "flake-utils",
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"rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
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"lastModified": 1756607542,
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"narHash": "sha256-+99fEAk0HwjYgIW2tEOs7ayBDxnU9NAM5E29ZxgyX40=",
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"owner": "srid",
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"repo": "haskell-flake",
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"rev": "73e3891fb135c679a1c30fae4b101e5b41b8ca61",
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"type": "github"
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},
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"original": {
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"owner": "numtide",
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"repo": "flake-utils",
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"owner": "srid",
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"repo": "haskell-flake",
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"type": "github"
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}
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},
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"hello-flake": {
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"inputs": {
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"flake-utils": "flake-utils_2",
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"nixpkgs": "nixpkgs"
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},
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"locked": {
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"lastModified": 1757875192,
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"narHash": "sha256-JBkm6NAOYjR3Sc3BxJ2ijrTqW8Ga0NlN9GPUJ/NUsGM=",
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"ref": "refs/heads/main",
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"rev": "2d9363f255c44a41be2e5291dd624e078e7f4139",
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"revCount": 25,
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"type": "git",
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"url": "https://codeberg.org/mhwombat/hello-flake"
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},
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"original": {
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"type": "git",
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"url": "https://codeberg.org/mhwombat/hello-flake"
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}
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},
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"nixpkgs": {
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"locked": {
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"lastModified": 1757873102,
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"narHash": "sha256-kYhNxLlYyJcUouNRazBufVfBInMWMyF+44xG/xar2yE=",
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"owner": "NixOS",
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"repo": "nixpkgs",
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"rev": "88cef159e47c0dc56f151593e044453a39a6e547",
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"type": "github"
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},
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"original": {
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"owner": "NixOS",
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"repo": "nixpkgs",
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"type": "github"
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}
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},
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"nixpkgs_2": {
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"locked": {
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"lastModified": 1757952092,
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"narHash": "sha256-BcfTLFCU7elUJ2dwyt0iTjxsz/XLh+8ZygDcFwy6xPE=",
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@ -85,29 +66,62 @@
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"type": "github"
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}
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},
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"root": {
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"inputs": {
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"flake-utils": "flake-utils",
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"hello-flake": "hello-flake",
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"nixpkgs": "nixpkgs_2"
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}
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},
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"systems": {
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"nixpkgs-lib": {
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"locked": {
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"lastModified": 1681028828,
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"narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
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"owner": "nix-systems",
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"repo": "default",
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"rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
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"lastModified": 1754788789,
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"narHash": "sha256-x2rJ+Ovzq0sCMpgfgGaaqgBSwY+LST+WbZ6TytnT9Rk=",
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"owner": "nix-community",
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"repo": "nixpkgs.lib",
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"rev": "a73b9c743612e4244d865a2fdee11865283c04e6",
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"type": "github"
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},
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"original": {
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"owner": "nix-systems",
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"repo": "default",
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"owner": "nix-community",
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"repo": "nixpkgs.lib",
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"type": "github"
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}
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},
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"systems_2": {
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"nixpkgs_2": {
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"locked": {
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"lastModified": 1756911493,
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"narHash": "sha256-6n/n1GZQ/vi+LhFXMSyoseKdNfc2QQaSBXJdgamrbkE=",
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"owner": "nixos",
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"repo": "nixpkgs",
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"rev": "c6a788f552b7b7af703b1a29802a7233c0067908",
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"type": "github"
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},
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"original": {
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"owner": "nixos",
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"ref": "nixpkgs-unstable",
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"repo": "nixpkgs",
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"type": "github"
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}
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},
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"pandoc-columns": {
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"inputs": {
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"flake-parts": "flake-parts",
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"haskell-flake": "haskell-flake",
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"nixpkgs": "nixpkgs_2"
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},
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"locked": {
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"lastModified": 1757244346,
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"narHash": "sha256-Ewpv8f+CvF0du1egjRJoeOZhKsdoqPkb2ecrwTPI+os=",
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"path": "/home/amy/github/pandoc-columns",
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"type": "path"
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},
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"original": {
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"path": "/home/amy/github/pandoc-columns",
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"type": "path"
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}
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},
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"root": {
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"inputs": {
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"flake-utils": "flake-utils",
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"nixpkgs": "nixpkgs",
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"pandoc-columns": "pandoc-columns"
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}
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},
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"systems": {
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"locked": {
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"lastModified": 1681028828,
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"narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
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@ -2,18 +2,19 @@
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inputs = {
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nixpkgs.url = "github:NixOS/nixpkgs";
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flake-utils.url = "github:numtide/flake-utils";
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hello-flake.url = "git+https://codeberg.org/mhwombat/hello-flake";
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pandoc-columns.url = "/home/amy/github/pandoc-columns";
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};
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outputs = { self, nixpkgs, flake-utils, hello-flake }:
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outputs = { self, nixpkgs, flake-utils, pandoc-columns }:
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flake-utils.lib.eachDefaultSystem (system:
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let
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pkgs = import nixpkgs { inherit system; };
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customGhc = pkgs.haskellPackages.ghcWithPackages (p: with p; [ pandoc-columns ]);
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in
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{
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devShells = rec {
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default = pkgs.mkShell {
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buildInputs = [ hello-flake.packages.${system}.hello ];
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buildInputs = [ customGhc ];
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};
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};
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}
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