Add flake check

build.sh

@@ -26,25 +26,23 @@ 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/$d" || exit 1
-    mkdir -p "$HUGO/$d" || exit 1
+  DESIRED_LOCATION=$(basename "$d")
-    DESIRED_LOCATION=$(basename "$d")
+  DEST=$(dirname "$d")
-    DEST=$(dirname "$d")
+  cp -r "$IMAGES/$DESIRED_LOCATION" "$HUGO/$DEST"
-    cp -r "$IMAGES/$DESIRED_LOCATION" "$HUGO/$DEST"
+done <"$IMAGES/image-targets.txt"
-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")
-    DIR="$HUGO"/$(dirname "$texfile")
+  TEXFILE_BASE=$(basename "$texfile")
-    TEXFILE_BASE=$(basename "$texfile")
+  PDFFILE=$(basename "$texfile" .tex).pdf
-    PDFFILE=$(basename "$texfile" .tex).pdf
+  mkdir -p "$DIR"
-    mkdir -p "$DIR"
+  cp "$PDFS/$TEXFILE_BASE" "$DIR/"
-    cp "$PDFS/$TEXFILE_BASE" "$DIR/"
+  cp "$PDFS/$PDFFILE" "$DIR/"
-    cp "$PDFS/$PDFFILE" "$DIR/"
+done <"$PDFS/pdf-targets.txt"
-done < "$PDFS/pdf-targets.txt"
 
 echo Building site.
 docker run --user "$(id -u):$(id -g)" -v "$HUGO:/hugo" -v "$OUTPUT:/output" build-hugo sh -c "/build.sh /hugo /output" || exit 1

build/all.sh

@@ -8,33 +8,31 @@ 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 "$texfile")
-    DIR=$(dirname "$texfile")
+  TEXFILE_BASE=$(basename "$texfile")
-    TEXFILE_BASE=$(basename "$texfile")
+  if [ -z "${TEXFILE_BASE}" ]; then
-    if [ -z "${TEXFILE_BASE}" ]; then
+    echo "Skipping empty line"
-      echo "Skipping empty line"
+  else
-    else
+    PDFFILE=$(basename "$texfile" .tex).pdf
-      PDFFILE=$(basename "$texfile" .tex).pdf
+    mkdir -p "$DIR"
-      mkdir -p "$DIR"
+    echo "$TEXFILE_BASE"
-      echo "$TEXFILE_BASE"
+    echo "$PDFFILE"
-      echo "$PDFFILE"
+    cp "${pdfs}/$TEXFILE_BASE" "$texfile"
-      cp "${pdfs}/$TEXFILE_BASE" "$texfile"
+    cp "${pdfs}/$PDFFILE" "$DIR/"
-      cp "${pdfs}/$PDFFILE" "$DIR/"
+  fi
-    fi
+done <"${pdfs}/pdf-targets.txt"
-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
-    if [ -n "${d}" ]; then
+    DIR=$(dirname "$d")
-      DIR=$(dirname "$d")
+    mkdir -p "$DIR" || exit 1
-      mkdir -p "$DIR" || exit 1
+    DESIRED_LOCATION=$(basename "$d")
-      DESIRED_LOCATION=$(basename "$d")
+    echo "$d -> $DESIRED_LOCATION"
-      echo "$d -> $DESIRED_LOCATION"
+    cp -r "${images}/$DESIRED_LOCATION" "$d"
-      cp -r "${images}/$DESIRED_LOCATION" "$d"
+  fi
-    fi
+done <"${images}/image-targets.txt"
-done < "${images}/image-targets.txt"
 
 echo "Linking Anki decks."
 mkdir static/AnkiDecks && cp -R "${ankiDecks}/." static/AnkiDecks
@@ -47,12 +45,11 @@ cp -r "$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 "$file_to_copy"
-    echo "$file_to_copy"
+  sourcefile=$(echo "$file_to_copy" | cut -d ' ' -f 1)
-    sourcefile=$(echo "$file_to_copy" | cut -d ' ' -f 1)
+  destfile=$(echo "$file_to_copy" | cut -d ' ' -f 2-)
-    destfile=$(echo "$file_to_copy" | cut -d ' ' -f 2-)
+  cp "$extraContent/$sourcefile" "$destfile"
-    cp "$extraContent/$sourcefile" "$destfile"
+done <"$extraContent/map.txt"
-done < "$extraContent/map.txt"
 
 /bin/sh "${buildHugo}/run.sh" . ./output

docker/hadolint/build.sh

@@ -1,3 +1,3 @@
 #!/bin/sh
 
-find /work -type f -name 'Dockerfile' -print0 | xargs -0 -n1 hadolint
+find /work -type f -name 'Dockerfile' -print0 | xargs -0 -n1 hadolint

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"
+  hugo --minify --source "$SOURCE_DIR" --destination "$OUTPUT_DIR"

docker/load/build.sh

@@ -7,4 +7,4 @@ cp -Rf /git/. /output || exit 1
 
 chmod -R a+rw /output || exit 1
 
-touch /sentinels/load.txt
+touch /sentinels/load.txt

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

@@ -44,51 +44,77 @@
   }:
     flake-utils.lib.eachDefaultSystem (system: let
       pkgs = nixpkgs.legacyPackages.${system};
+    in let
+      buildHugo = scripts.lib.createShellScript pkgs "hugo" ./docker/hugo/build.sh;
+    in let
+      katex-parts = pkgs.stdenv.mkDerivation {
+        __contentAddressed = true;
+        pname = "katex";
+        version = "0.1.0";
+        src = katex.outputs.packages.${system}.default;
+
+        installPhase = ''
+          mkdir "$out"
+          ls -la .
+          cp -r ./libexec/katex/dist "$out/dist"
+        '';
+      };
+    in let
+      website = pkgs.stdenv.mkDerivation {
+        __contentAddressed = true;
+        pname = "patrickstevens.co.uk";
+        version = "0.1.0";
+
+        src = ./hugo;
+
+        buildInputs = [
+          pkgs.hugo
+          pkgs.html-tidy
+        ];
+
+        buildPhase = ''
+          ${scripts.lib.createShellScript pkgs "all" ./build/all.sh}/run.sh "${pdfs.packages.${system}.default}" "${images.packages.${system}.default}" "${anki-decks.packages.${system}.default}" "${buildHugo}" "${katex-parts}" "${extra-content}"
+        '';
+
+        checkPhase = ''
+          echo "Linting HTML."
+          ${pkgs.html-tidy}/bin/tidy
+        '';
+
+        installPhase = ''
+          mv output $out
+        '';
+      };
     in rec {
       packages = flake-utils.lib.flattenTree {
         gitAndTools = pkgs.gitAndTools;
+        default = website;
       };
-      defaultPackage =
+      checks = {
-      let
+        fmt-check = pkgs.stdenvNoCC.mkDerivation {
-        buildHugo = scripts.lib.createShellScript pkgs "hugo" ./docker/hugo/build.sh;
+          name = "fmt-check";
-      in let
+          src = ./.;
-        katex-parts = pkgs.stdenv.mkDerivation {
+          nativeBuildInputs = [pkgs.alejandra pkgs.shellcheck pkgs.shfmt];
-          __contentAddressed = true;
-          pname = "katex";
-          version = "0.1.0";
-          src = katex.outputs.packages.${system}.default;
-
-          installPhase = ''
-            mkdir "$out"
-            ls -la .
-            cp -r ./libexec/katex/dist "$out/dist"
-          '';
-        };
-      in
-        pkgs.stdenv.mkDerivation {
-          __contentAddressed = true;
-          pname = "patrickstevens.co.uk";
-          version = "0.1.0";
-
-          src = ./hugo;
-
-          buildInputs = [
-            pkgs.hugo
-            pkgs.html-tidy
-          ];
-
-          buildPhase = ''
-            ${scripts.lib.createShellScript pkgs "all" ./build/all.sh}/run.sh "${pdfs.packages.${system}.default}" "${images.packages.${system}.default}" "${anki-decks.packages.${system}.default}" "${buildHugo}" "${katex-parts}" "${extra-content}"
-          '';
-
           checkPhase = ''
-            echo "Linting HTML."
+            find . -type f -name '*.sh' | xargs shfmt -d -s -i 2 -ci
-            ${pkgs.html-tidy}/bin/tidy
+            alejandra -c .
+            find . -type f -name '*.sh' -exec shellcheck -x {} \;
           '';
+          installPhase = "mkdir $out";
+          dontBuild = true;
+          doCheck = true;
+        };
 
-          installPhase = ''
+        website-check = pkgs.stdenvNoCC.mkDerivation {
-            mv output $out
+          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.
@@ -81,5 +79,4 @@ That ends the proof. Its beauty lies in the way it regards sums of two squares a
 [Gaussian integers]: https://en.wikipedia.org/wiki/Gaussian_integers
 [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
+[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