Fixes acquia#4496 to make a zsh version of git hooks.

config/build.yml

@@ -86,13 +86,16 @@ drush:
   dir: ${docroot}
   sanitize: true
 
+# Valid options are bash or zsh to support git hooks for both shells.
+shell: bash
+
 git:
   # The value of a hook should be the file path to a directory containing an
   # executable file named after the hook. Changing a hook value to 'false' will disable it.
   # You should execute `blt blt:init:git-hooks` after modifying these values.
   hooks:
-    pre-commit: ${blt.root}/scripts/git-hooks
-    pre-push: ${blt.root}/scripts/git-hooks
+    pre-commit: ${blt.root}/scripts/git-hooks/${shell}
+    pre-push: ${blt.root}/scripts/git-hooks/${shell}
     commit-msg: ${blt.root}/scripts/git-hooks
   commit-msg:
     # Commit messages must conform to this pattern.

scripts/git-hooks/bash/pre-push

@@ -0,0 +1,9 @@
+#!/usr/bin/env zsh
+
+ROOT_DIR="$(pwd)/"
+
+echo "Executing .git/hooks/pre-push..."
+"${ROOT_DIR}"/vendor/bin/blt internal:git-hook:execute:pre-push
+
+# Return the status of the last run command.
+exit $?

scripts/git-hooks/zsh/pre-commit

@@ -0,0 +1,11 @@
+#!/usr/bin/env zsh
+
+ROOT_DIR="$(pwd)/"
+LIST=$( git diff --name-only --cached --diff-filter=ACM )
+
+echo "Executing .git/hooks/pre-commit..."
+git diff-index --quiet HEAD -- || echo "Untracked files are present, this may impact the validity of pre-commit checks."
+"${ROOT_DIR}"/vendor/bin/blt internal:git-hook:execute:pre-commit "${LIST}"
+
+# Return the status of the last run command.
+exit $?