move pre-commit logic to separate bash file, phetsims/perennial#404

doc/phet-development-overview.md

@@ -84,7 +84,7 @@ Method 1 (recommended): Get all PhET repos
 
 * Change directory to phetsims: `cd phetsims`
 * Get [phetsims/perennial](https://github.com/phetsims/perennial): `git clone https://github.com/phetsims/perennial`
-* Run "clone-missing-repos.sh": `./perennial/bin/clone-missing-repos.sh`
+* Run "clone-missing-repos.sh": `./perennial-alias/bin/clone-missing-repos.sh`
 
 Method 2: Manually get specific PhET repos
 
@@ -475,8 +475,8 @@ https://github.com/phetsims/chipper/blob/main/js/initialize-globals.js
 13. Install PhET's git hooks to run basic checks as part of the git lifecycle. Run this from the root of your checkout.
     First it clears any pre-existing commit hooks, then installs the new hooks.
 
-```
-perennial/bin/for-each.sh perennial/data/active-repos "rm .git/hooks/pre-commit; git init --template=../phet-info/git-template-dir"
+```sh
+perennial-alias/bin/for-each.sh perennial-alias/data/active-repos "rm .git/hooks/pre-commit; git init --template=../phet-info/git-template-dir"
 ```
 
 Getting to optimal performance on all supported platforms can be tricky--this section enumerates possible optimizations

git-template-dir/hooks/pre-commit

@@ -1,15 +1,17 @@
 #!/bin/bash
 #-----------------------------------------------------------------------------------------------------------------------
-# git pre-commit hooks
+# git pre-commit hooks for the PhET Codebase. These are installed on all repos.
+#
+# This script only launches another bash script, and new logic should NOT be added here. This way, changes can be made
+# without the need to reinstall git hooks across all repos.
 #
 # Please see https://github.com/phetsims/phet-info/blob/main/doc/phet-development-overview.md#utilities-and-instrumentation-for-development-and-testing
 # for installation instructions.
 #-----------------------------------------------------------------------------------------------------------------------
 
-# Detect the current branch. Requires git 2.22.0 or higher
-current_branch=$(git branch --show-current)
+PRE_COMMIT_SCRIPT="../perennial-alias/bin/hook-launcher-pre-commit.sh"
 
-# Only run pre-commit hooks in main, see https://github.com/phetsims/perennial/issues/276
-if [[ "$current_branch" == "main" ]]; then
-  ../perennial-alias/bin/sage run ../chipper/js/scripts/hook-pre-commit.js
+# only run the file if it exists. This helps with backwards compatibility if on an older version of perennial-alias.
+if test -f "$PRE_COMMIT_SCRIPT"; then
+  $PRE_COMMIT_SCRIPT
 fi