use gnu parallel to run pre-commit hook check commands in parallel

check.sh

@@ -1,28 +1,20 @@
 #!/bin/bash
 
 source /etc/profile
+source /lib/gentoo/functions.sh
 
 export PATH="${HOME}/.local/bin:${PATH}" CC=clang CXX=clang++
 
-if command -v ldd; then
-    export LDFLAGS=-fuse-ld=lld
-fi
+ldd=$(command -v ldd)
 
-for file in $(find src -type f -name '*.rs'); do
-    rustfmt --edition 2024 --check ${file} || exit $?
-done
+if [[ -n ${ldd} ]]; then
+    export LDFLAGS=-fuse-ld=${ldd}
+fi
 
 if [[ ! -d build ]]; then
     meson setup -Dfuzz=enabled -Dtests=enabled build || exit $?
 fi
 
-meson compile -C build || exit $?
-
-ninja clippy -C build || exit $?
-
-for test in unittests; do
-    meson test -v ${test} -C build || exit $?
-done
-
-# hack to make sure we use the system meson, since meson format from git is broken
-/usr/bin/meson format --recursive --check-only || exit $?
+ebegin "running check commands"
+parallel --halt soon,fail=1 --keep-order -j$(nproc) < check_commands.txt
+eend $? || exit $?

check_commands.txt

@@ -0,0 +1,4 @@
+/usr/bin/meson format --recursive --check-only
+rustfmt --edition 2024 --check $(find src -type f -name '*.rs')
+ninja clippy -C build
+meson test unittests -C build