GO-5600 fix hook

.githooks/commit-msg

@@ -1,27 +1,28 @@
 #!/usr/bin/env bash
-# The script below adds the branch name automatically to
-# every one of your commit messages. The regular expression
-# below searches for linear issue key's. The issue key will
-# be extracted out of your branch name
+#
+# Extract ISSUE_ID from branch (e.g. JS-1234, GO-4222, FOO-99999) and
+# prepend it to your commit message if not already present.
 
-REGEX_ISSUE_ID="[a-zA-Z0-9]+-[0-9]+"
-
-# Find current branch name
+REGEX_ISSUE_ID='[A-Za-z]+-[0-9]+'    # letters-dash-numbers
 BRANCH_NAME=$(git rev-parse --abbrev-ref HEAD)
 COMMIT_MSG_FILE=$1
-COMMIT_TEXT=$(cat "$COMMIT_MSG_FILE")
+COMMIT_TEXT=$(< "$COMMIT_MSG_FILE")
 
-if [[ -z "$BRANCH_NAME" ]]; then
-    echo "Commit message validation failed: no branch name!"; exit 1
+# Find and uppercase the first matching issue key
+ISSUE_ID=$(echo "$BRANCH_NAME" \
+  | grep -oE "$REGEX_ISSUE_ID" \
+  | head -1 \
+  | tr '[:lower:]' '[:upper:]')
+
+# If no issue key, reject the commit
+if [[ -z "$ISSUE_ID" ]]; then
+  echo "ERROR: Branch name must contain an issue key (e.g. GO-1234)." >&2
+  exit 1
 fi
 
-# Extract issue id from branch name
-ISSUE_ID=$(echo "$BRANCH_NAME" | grep -o -E "$REGEX_ISSUE_ID" | head -1 | awk '{print toupper($0)}')
-
-if [[ "$ISSUE_ID" != "GO-"* ]]; then
-  echo "Commit message validation failed: branch name should contain issue name!"; exit 1
+# If the commit message doesn’t already start with ISSUE_ID, prepend it
+if [[ ! "$COMMIT_TEXT" =~ ^$ISSUE_ID ]]; then
+  printf "%s %s\n" "$ISSUE_ID" "$COMMIT_TEXT" > "$COMMIT_MSG_FILE"
 fi
 
-if [[ "$COMMIT_TEXT" != "GO-"* ]]; then
-  echo "$ISSUE_ID" "$COMMIT_TEXT" > "$COMMIT_MSG_FILE"
-fi
+exit 0