Add flake check

build.sh

@@ -26,8 +26,7 @@ docker build docker/hugo -t build-hugo || exit 1
 
 echo Building thumbnails.
 docker run --user "$(id -u):$(id -g)" -v "$IMAGES:/output" build-pictures sh -c "/build.sh /output" || exit 1
-while read -r d
+while read -r d; do
-do
   mkdir -p "$HUGO/$d" || exit 1
   DESIRED_LOCATION=$(basename "$d")
   DEST=$(dirname "$d")
@@ -36,8 +35,7 @@ done < "$IMAGES/image-targets.txt"
 
 echo Building LaTeX.
 docker run --user "$(id -u):$(id -g)" -v "$PDFS:/inputs" build-latex sh -c "/build.sh /inputs" || exit 1
-while read -r texfile
+while read -r texfile; do
-do
   DIR="$HUGO"/$(dirname "$texfile")
   TEXFILE_BASE=$(basename "$texfile")
   PDFFILE=$(basename "$texfile" .tex).pdf

build/all.sh

@@ -8,8 +8,7 @@ katex=$5
 extraContent=$6
 
 echo "Linking PDFs: $PDF_FOLDER/pdf-targets.txt"
-while IFS= read -r texfile || [[ -n "$r" ]]
+while IFS= read -r texfile || [[ -n $r ]]; do
-do
   DIR=$(dirname "$texfile")
   TEXFILE_BASE=$(basename "$texfile")
   if [ -z "${TEXFILE_BASE}" ]; then
@@ -25,8 +24,7 @@ do
 done <"${pdfs}/pdf-targets.txt"
 
 echo "Linking thumbnails."
-while IFS= read -r d || [[ -n "$d" ]]
+while IFS= read -r d || [[ -n $d ]]; do
-do
   if [ -n "${d}" ]; then
     DIR=$(dirname "$d")
     mkdir -p "$DIR" || exit 1
@@ -47,8 +45,7 @@ cp -r "$katex/dist/contrib" themes/anatole/assets/contrib
 cp "$katex"/dist/*.js themes/anatole/assets/
 cp "$katex"/dist/*.css themes/anatole/assets/
 
-while IFS= read -r file_to_copy
+while IFS= read -r file_to_copy; do
-do
   echo "$file_to_copy"
   sourcefile=$(echo "$file_to_copy" | cut -d ' ' -f 1)
   destfile=$(echo "$file_to_copy" | cut -d ' ' -f 2-)

docker/hugo/build.sh

@@ -3,5 +3,5 @@
 SOURCE_DIR=$(readlink -f "$1")
 OUTPUT_DIR=$(readlink -f "$2")
 
-rm -rf "${OUTPUT_DIR:?}/*" && \
+rm -rf "${OUTPUT_DIR:?}/*" &&
   hugo --minify --source "$SOURCE_DIR" --destination "$OUTPUT_DIR"

flake.lock

@@ -104,11 +104,11 @@
         "scripts": "scripts_2"
       },
       "locked": {
-        "lastModified": 1696161637,
+        "lastModified": 1696175612,
-        "narHash": "sha256-GwkTsWHakdktMrIlaonEGl/+/GxEgC3xpn1QzNNxKhU=",
+        "narHash": "sha256-8V8klzc7T3EdAdS4r8RRjNvTTytQOsvfi7DfK6NFK6M=",
         "ref": "refs/heads/main",
-        "rev": "f47d539cedfaab677133b53fd4d02e24d2256985",
+        "rev": "ac0b0180304bce7683dc8b4466a6e92b339c0b7e",
-        "revCount": 14,
+        "revCount": 15,
         "type": "git",
         "url": "file:/Users/patrick/Desktop/website/static-site-images"
       },

flake.nix

@@ -44,12 +44,7 @@
   }:
     flake-utils.lib.eachDefaultSystem (system: let
       pkgs = nixpkgs.legacyPackages.${system};
-    in rec {
+    in let
-      packages = flake-utils.lib.flattenTree {
-        gitAndTools = pkgs.gitAndTools;
-      };
-      defaultPackage =
-      let
       buildHugo = scripts.lib.createShellScript pkgs "hugo" ./docker/hugo/build.sh;
     in let
       katex-parts = pkgs.stdenv.mkDerivation {
@@ -64,8 +59,8 @@
           cp -r ./libexec/katex/dist "$out/dist"
         '';
       };
-      in
+    in let
-        pkgs.stdenv.mkDerivation {
+      website = pkgs.stdenv.mkDerivation {
         __contentAddressed = true;
         pname = "patrickstevens.co.uk";
         version = "0.1.0";
@@ -90,5 +85,36 @@
           mv output $out
         '';
       };
+    in rec {
+      packages = flake-utils.lib.flattenTree {
+        gitAndTools = pkgs.gitAndTools;
+        default = website;
+      };
+      checks = {
+        fmt-check = pkgs.stdenvNoCC.mkDerivation {
+          name = "fmt-check";
+          src = ./.;
+          nativeBuildInputs = [pkgs.alejandra pkgs.shellcheck pkgs.shfmt];
+          checkPhase = ''
+            find . -type f -name '*.sh' | xargs shfmt -d -s -i 2 -ci
+            alejandra -c .
+            find . -type f -name '*.sh' -exec shellcheck -x {} \;
+          '';
+          installPhase = "mkdir $out";
+          dontBuild = true;
+          doCheck = true;
+        };
+
+        website-check = pkgs.stdenvNoCC.mkDerivation {
+          name = "website-check";
+          src = website;
+          installPhase = "mkdir $out";
+          dontBuild = true;
+          doCheck = true;
+          checkPhase = ''
+            ${pkgs.bash}/bin/bash ${scripts.lib.createShellScript pkgs "linkcheck" ./linkcheck.sh}/run.sh ${pkgs.lynx}/bin/lynx
+          '';
+        };
+      };
     });
 }

hugo/content/anki-decks/index.md

@@ -10,9 +10,9 @@ I have deleted almost all of the Anki decks on this page, because I think they w
 They were made during a time when I didn't really know how to use Anki appropriately.
 Any remaining decks here are CC-BY-SA.
 
-*   [Geography]. You can filter out the `london-tube` tag if you like, or `world-capitals`, or `american-geography`.
+*   [Geography] (the deck has a misleading name; it's actually a general Geography deck). You can filter out the `london-tube` tag if you like, or `world-capitals`, or `american-geography`.
 
 <a href="http://creativecommons.org/licenses/by-sa/3.0/deed.en_GB" rel="license"><img style="border-width: 0;" alt="Creative Commons Licence" src="https://licensebuttons.net/l/by-sa/3.0/88x31.png" /></a>
 This work by <a href="/anki-decks" rel="cc:attributionURL">Patrick Stevens</a> is licensed under a <a href="http://creativecommons.org/licenses/by-sa/3.0/deed.en_GB" rel="license">Creative Commons Attribution-ShareAlike 3.0 Unported License</a>.
 
-[Geography]: /AnkiDecks/Geography.apkg
+[Geography]: /AnkiDecks/CapitalsOfTheWorld.apkg

hugo/content/posts/2013-06-26-sylow-theorems.md

@@ -14,7 +14,7 @@ summary: "A fairly long and winding way through a proof of the three Sylow theor
 ---
 (This post is mostly to set up a kind of structure for the website; in particular, to be the first in a series of posts summarising some mathematical results I stumble across.)
 
-EDIT: There is now [an Anki deck](/AnkiDecks/SylowTheoremsProof.apkg) of this proof, and a [collection of poems][sylow sonnets] summarising it.
+EDIT: There is now a [collection of poems][sylow sonnets] summarising this proof.
 
 In Part IB of the Mathematical Tripos (that is, second-year material), there is a course called Groups, Rings and Modules. I took it in the academic year 2012-2013, when it was lectured by [Imre Leader](https://en.wikipedia.org/wiki/Imre_Leader). He told us that there were three main proofs of the [Sylow theorems](https://en.wikipedia.org/wiki/Sylow_theorems), two of which were horrible and one of which was nice; he presented the "nice" one. At the time, I thought this was the most beautiful proof of anything I'd ever seen, although other people have told me it's a disgusting proof.
 

hugo/content/posts/2014-09-09-sum-of-two-squares-theorem.md

@@ -12,7 +12,7 @@ aliases:
 title: Sum-of-two-squares theorem
 ---
 
-*Wherein I detail the most beautiful proof of a theorem I've ever seen, in a bite-size form suitable for an Anki deck. I attach the [Anki deck], which contains the bulleted lines of this post as flashcards.*
+*Wherein I detail the most beautiful proof of a theorem I've ever seen, in a bite-size form suitable for an Anki deck.
 
 # Statement
 There's no particularly nice way to motivate this in this context, I'm afraid, so we'll just dive in. I have found this method extremely hard to motivate - a few of the steps are a glorious magic.
@@ -32,8 +32,6 @@ Additionally, we'll call a number which is the sum of two squares a **nice** num
 ## First implication: if primes 3 mod 4 appear only to even powers…
 We prove the result first for the primes, and will then show that niceness is preserved on taking products.
 
-
-
 * Let \\(p=2\\). Then \\(p\\) is trivially the sum of two squares: it is \\(1+1\\).
 * Let \\(p\\) be 1 mod 4.
 * Then modulo \\(p\\), we have \\(-1\\) is square.
@@ -82,4 +80,3 @@ That ends the proof. Its beauty lies in the way it regards sums of two squares a
 [UFD]: https://en.wikipedia.org/wiki/Unique_factorization_domain
 [irreducible]: https://en.wikipedia.org/wiki/Irreducible_element
 [prime]: https://en.wikipedia.org/wiki/Prime_element
-[Anki deck]: {{< baseurl >}}AnkiDecks/SumOfTwoSquaresTheorem.apkg

linkcheck.sh

@@ -0,0 +1,37 @@
+#!/bin/bash
+
+bad=0
+
+LYNX=$1
+
+evaluate_file() {
+  target=$1
+  links=$("$LYNX" -dump --listonly -image_links --nonumbers -hiddenlinks=listonly "$target" | awk '
+/Visible links/ {
+found=1
+next
+}
+found { print }
+' | grep 'file:' | cut -d '/' -f 3- | grep -v '#')
+
+  # hurr durrr accidentally quadratic
+  for link in $links; do
+    filename=".$link"
+    if [ -d "$filename" ]; then
+      filename="$filename/index.html"
+    fi
+
+    if ! [ -e "$filename" ]; then
+      echo "File does not exist, while parsing '$target': $filename" >&2
+      bad=1
+    fi
+  done
+}
+
+while IFS= read -d '' -u3 -r file; do
+  evaluate_file "$file"
+done 3< <(find . -type f -name '*.html' -print0)
+
+if [ $bad -eq 1 ]; then
+  exit $bad
+fi