Create prepare-commit-msg (#175)

Co-authored-by: gstraccini[bot] <150967461+gstraccini[bot]@users.noreply.github.com>

.githooks/prepare-commit-msg

@@ -0,0 +1,60 @@
+#!/usr/bin/env sh
+
+# This script generates an AI-powered commit message using dotnet-aicommitmessage.
+# It can be bypassed by setting the GIT_AICOMMIT_SKIP environment variable.
+
+# Exit immediately if GIT_AICOMMIT_SKIP is set
+if [ -n "$GIT_AICOMMIT_SKIP" ]; then
+    exit 0
+fi
+
+# 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="$1"
+
+# Check if the commit message file exists
+if [ ! -f "$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" "${COMMIT_MSG_FILE}.bak"
+
+# Generate the AI commit message
+if ! AI_MESSAGE=$(dotnet-aicommitmessage generate-message -m "$CURRENT_MESSAGE" 2>/dev/null); then
+    echo "Error: Failed to generate AI commit message. Using original message." >&2
+    exit 0
+fi
+
+# Check if the generated message is empty
+if [ -z "$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