Update prepare-commit-msg (#135)

* Update prepare-commit-msg

* Update .githooks/prepare-commit-msg

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

---------

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

.githooks/prepare-commit-msg

@@ -8,43 +8,53 @@ if [ -n "$GIT_AICOMMIT_SKIP" ]; then
     exit 0
 fi
 
-if ! command -v dotnet-aicommitmessage &>/dev/null
-then
+# Check if dotnet-aicommitmessage is installed and in PATH
+if ! command -v dotnet-aicommitmessage >/dev/null 2>&1; then
     echo "Error: dotnet-aicommitmessage is not installed or not in PATH" >&2
     echo "Please install it by running 'dotnet tool install -g aicommitmessage'" >&2
     exit 1
 fi
 
+# Ensure the commit message file is provided
 if [ -z "$1" ]; then
     echo "Error: Commit message file not provided" >&2
     exit 1
 fi
 
-COMMIT_MSG_FILE=$1
+COMMIT_MSG_FILE="$1"
+
+# Check if the commit message file exists
 if [ ! -f "$COMMIT_MSG_FILE" ]; then
     echo "Error: Commit message file '$COMMIT_MSG_FILE' not found" >&2
     exit 1
 fi
 
+# Read the current commit message
 CURRENT_MESSAGE=$(cat "$COMMIT_MSG_FILE")
+
+# Backup the commit message file
 cp "$COMMIT_MSG_FILE" "${COMMIT_MSG_FILE}.bak"
 
-if ! AI_MESSAGE=$(dotnet-aicommitmessage generate-message -m "$CURRENT_MESSAGE"); then
+# Generate the AI commit message
+if ! AI_MESSAGE=$(dotnet-aicommitmessage generate-message -m "$CURRENT_MESSAGE" 2>/dev/null); then
     echo "Error: Failed to generate AI commit message. Using original message." >&2
     exit 0
 fi
 
-if [ -z "$AI_MESSAGE" ] || [ "$AI_MESSAGE" =~ ^[[:space:]]*$ ]; then
+# Check if the generated message is empty
+if [ -z "$AI_MESSAGE" ] || echo "$AI_MESSAGE" | grep -q '^[[:space:]]*$'; then
     echo "Error: Generated commit message is empty." >&2
     exit 1
 fi
 
+# Write the new commit message back to the file
 if ! echo "$AI_MESSAGE" > "$COMMIT_MSG_FILE" 2>/dev/null; then
     echo "Error: Failed to write new commit message" >&2
     cp "${COMMIT_MSG_FILE}.bak" "$COMMIT_MSG_FILE"
     rm "${COMMIT_MSG_FILE}.bak"
     exit 1
 fi
 
+# Remove the backup file
 rm "${COMMIT_MSG_FILE}.bak"
 exit 0