Use pre-commit hook from pre-commit-hooks.nix

.gitignore

@@ -1,2 +1,3 @@
-wordclock_credentials.py
+/.pre-commit-config.yaml
 __pycache__
+wordclock_credentials.py

.pre-commit-config.yaml

@@ -1,6 +0,0 @@
-repos:
-  - repo: https://github.com/psf/black
-    rev: stable
-    hooks:
-      - id: black
-        language_version: python3

default.nix

@@ -0,0 +1,11 @@
+let
+  nix-pre-commit-hooks = import (builtins.fetchTarball "https://github.com/cachix/pre-commit-hooks.nix/tarball/master");
+in
+{
+  pre-commit-check = nix-pre-commit-hooks.run {
+    src = ./.;
+    hooks = {
+      black.enable = true;
+    };
+  };
+}

latexpic.sh

@@ -1,4 +1,10 @@
 #!/usr/bin/env bash
+# shellception since nix-shell and shebang does not work with combining texlive
+if ! command -v xelatex >> /dev/null; then
+	nix-shell -p 'texlive.combine { inherit (pkgs.texlive) scheme-small chemfig simplekv siunitx standalone varwidth; }' --run "$0 $@"
+	exit $?
+fi
+
 tmpdir=$(mktemp -d)
 cd $tmpdir
 
@@ -19,7 +25,7 @@ $(cat $OLDPWD/$1)
 \end{document}
 EOF
 
-lualatex doc.tex
+xelatex doc.tex
 mutool draw -o doc.svg doc.pdf
 inkscape -D -A doc.pdf doc.svg
 mutool draw -r 600 -o $OLDPWD/${1}.png doc.pdf

quizlet2anki.py

@@ -0,0 +1,24 @@
+#!/usr/bin/env nix-shell
+#!nix-shell -i python3 -p python3
+# I want to use Anki instead of Quizlet. However, Quizlet only provides a very
+# limited “export” functionality, that exports something like csv, but does nut
+# support quoting. So it will fail if your separation character is either your
+# column or row separator (e.g. if you have multiple lines in one field).
+
+# This script takes unquoted data with uncommon separators (|||||| for columns,
+# \n------\n for rows) and exports it as a more usable csv (quoted, cols
+# separated by \t, rows separated by \n)
+import sys
+
+outfile = sys.argv[1]
+
+quizlet_output = sys.stdin.read()
+
+maybe_tsv = (
+    '"' + quizlet_output.replace("||||||", '"\t"').replace("\n------\n", '"\n"') + '"'
+)
+
+maybe_tsv = maybe_tsv[:-2]
+
+with open(outfile, "w") as f:
+    f.write(maybe_tsv)

shell.nix

@@ -2,13 +2,9 @@
 
 pkgs.mkShell {
   nativeBuildInputs = with pkgs; [
-    gitAndTools.pre-commit
-    (python3.withPackages(ps: [ ps.virtualenv ]))
+    nixpkgs-fmt
   ];
   shellHook = ''
-    # black’s pre-commit hook builds a wheel (zip file) for black and fails
-    # when the timestamp is lower than 1980 (due to zip limitations)
-    export SOURCE_DATE_EPOCH=315532800
-    pre-commit install -f >/dev/null
+    ${(import ./default.nix).pre-commit-check.shellHook}
   '';
 }