From 2798b66fc24972a2df16a95feabe8ce9d33c8c8d Mon Sep 17 00:00:00 2001
From: Steven Lambert <2433219+straker@users.noreply.github.com>
Date: Wed, 10 Jan 2024 08:10:51 -0700
Subject: [PATCH] chore: only run build in changed dirs (#124)

---
 .github/workflows/update-generated-files.yml |  2 +-
 .husky/pre-commit                            | 26 +++++++++++++++++++-
 2 files changed, 26 insertions(+), 2 deletions(-)

diff --git a/.github/workflows/update-generated-files.yml b/.github/workflows/update-generated-files.yml
index 3290e76b..f936fc5b 100644
--- a/.github/workflows/update-generated-files.yml
+++ b/.github/workflows/update-generated-files.yml
@@ -52,7 +52,7 @@ jobs:
           git checkout -b $BRANCH_NAME
           git commit -m "chore: sync generated files"
           git push origin $BRANCH_NAME
-          gh pr create --base main --head $BRANCH_NAME --title "chore: sync generated files" --body ""
+          gh pr create --base main --head $BRANCH_NAME --title "chore: sync generated files" --body "This PR was opened by a robot :robot: :tada:."
         env:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
diff --git a/.husky/pre-commit b/.husky/pre-commit
index d8fd1bef..99339525 100755
--- a/.husky/pre-commit
+++ b/.husky/pre-commit
@@ -1,6 +1,30 @@
 #!/usr/bin/env sh
 . "$(dirname -- "$0")/_/husky.sh"
 
-npm run build -ws
+# only run the npm build script for each workspace directory that has changed files
+function run_build {
+  # convert multiline string into array
+  # @see https://stackoverflow.com/questions/24628076/convert-multiline-string-to-array
+  local IFS=$'\n'
+  local lines=($1)
+  local i
+
+  # get only the unique values from an array
+  # `lines[$i]%%/*` gets the substring up to the first '/'. so `semantic-pr-footer-v1/src/run.ts` becomes `semantic-pr-footer-v1`
+  # @see https://www.baeldung.com/linux/bash-unique-values-arrays
+  unique_dirs=($(for (( i=0; i<${#lines[@]}; i++ )) ; do echo "${lines[$i]%%/*}"; done | sort -u))
+
+  for dir in "${unique_dirs[@]}"; do
+     npm run build -w "$dir"
+  done
+}
+
+cd ./.github/actions
+files=$(git diff HEAD~1 --name-only --relative)
+if [ "$files" != "" ]; then
+  run_build "$files"
+fi
+
+cd ../../
 git add .
 npx lint-staged
\ No newline at end of file