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grammars.nix: allow the user to apply overlays #8749

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grammars.nix: allow the user to apply overlays
You can now apply overlays to the grammar derivations via
`grammarOverlays`. Also, the `src` in the derivation is now properly
unpacked to the build directory, allowing the user to mutate the source
files if they want to.
mydumpfire committed Nov 7, 2023
commit bc366086e76af00be7f7f7e626d5e2609d8f1607
45 changes: 24 additions & 21 deletions grammars.nix
Original file line number Diff line number Diff line change
@@ -5,6 +5,7 @@
runCommand,
yj,
includeGrammarIf ? _: true,
grammarOverlays ? [],
...
}: let
# HACK: nix < 2.6 has a bug in the toml parser, so we convert to JSON
@@ -48,22 +49,22 @@
then sourceGitHub
else sourceGit;
in
stdenv.mkDerivation rec {
stdenv.mkDerivation {
# see https://github.com/NixOS/nixpkgs/blob/fbdd1a7c0bc29af5325e0d7dd70e804a972eb465/pkgs/development/tools/parsing/tree-sitter/grammar.nix

pname = "helix-tree-sitter-${grammar.name}";
version = grammar.source.rev;

src =
if builtins.hasAttr "subpath" grammar.source
then "${source}/${grammar.source.subpath}"
else source;
src = source;
sourceRoot = if builtins.hasAttr "subpath" grammar.source then
"source/${grammar.source.subpath}"
else
"source";

dontUnpack = true;
dontConfigure = true;

FLAGS = [
"-I${src}/src"
"-Isrc"
"-g"
"-O3"
"-fPIC"
@@ -76,13 +77,13 @@
buildPhase = ''
runHook preBuild
if [[ -e "$src/src/scanner.cc" ]]; then
$CXX -c "$src/src/scanner.cc" -o scanner.o $FLAGS
elif [[ -e "$src/src/scanner.c" ]]; then
$CC -c "$src/src/scanner.c" -o scanner.o $FLAGS
if [[ -e src/scanner.cc ]]; then
$CXX -c src/scanner.cc -o scanner.o $FLAGS
elif [[ -e src/scanner.c ]]; then
$CC -c src/scanner.c -o scanner.o $FLAGS
fi
$CC -c "$src/src/parser.c" -o parser.o $FLAGS
$CC -c src/parser.c -o parser.o $FLAGS
$CXX -shared -o $NAME.so *.o
ls -al
@@ -105,15 +106,17 @@
'';
};
grammarsToBuild = builtins.filter includeGrammarIf gitGrammars;
builtGrammars =
builtins.map (grammar: {
inherit (grammar) name;
artifact = buildGrammar grammar;
})
grammarsToBuild;
grammarLinks =
builtins.map (grammar: "ln -s ${grammar.artifact}/${grammar.name}.so $out/${grammar.name}.so")
builtGrammars;
builtGrammars = builtins.map (grammar: {
inherit (grammar) name;
value = buildGrammar grammar;
}) grammarsToBuild;
extensibleGrammars =
lib.makeExtensible (self: builtins.listToAttrs builtGrammars);
overlayedGrammars = lib.pipe extensibleGrammars
(builtins.map (overlay: grammar: grammar.extend overlay) grammarOverlays);
grammarLinks = lib.mapAttrsToList
(name: artifact: "ln -s ${artifact}/${name}.so $out/${name}.so")
(lib.filterAttrs (n: v: lib.isDerivation v) overlayedGrammars);
in
runCommand "consolidated-helix-grammars" {} ''
mkdir -p $out