scripts/verify-commits.sh

#!/bin/bash

# Semantic commit pattern:
# feat|fix|docs|style|refactor|test|perf|build|ci|chore|revert(optional scope): message
# Allow dots (.), uppercase letters, and other common filename characters in scope
PATTERN='^(feat|fix|docs|style|refactor|test|perf|build|ci|chore|revert)(\([a-zA-Z0-9\-\.\_]+\))?: .{1,}$'

# Pattern for merge commits from pull requests - simplified to catch all formats
PR_MERGE_PATTERN='^Merge pull request'

# Pattern for standard Git merge commits
GIT_MERGE_PATTERN='^Merge (branch|remote-tracking branch) .+ into .+$'

# Counters for reporting
TOTAL_COMMITS=0
VALID_COMMITS=0
INVALID_COMMITS=0
MERGE_COMMITS=0

# Check if colors should be used
USE_COLORS=1
if [ "$1" = "--no-color" ] || [ "$1" = "-n" ]; then
    USE_COLORS=0
fi

# Define color functions that check if colors should be used
color() {
    if [ $USE_COLORS -eq 1 ] && [ -t 1 ]; then
        case "$1" in
        "red") echo -en "\033[0;31m" ;;
        "green") echo -en "\033[0;32m" ;;
        "yellow") echo -en "\033[0;33m" ;;
        "blue") echo -en "\033[0;34m" ;;
        "reset") echo -en "\033[0m" ;;
        esac
    fi
}

# Function to check if current directory is a Git repository
check_git_repo() {
    if ! git rev-parse --is-inside-work-tree >/dev/null 2>&1; then
        color "red"
        echo "Error: This is not a Git repository"
        color "reset"
        exit 1
    fi
}

# Ask for commit range or use default
get_commit_range() {
    color "yellow"
    echo "Enter commit range to check (default: all commits):"
    color "reset"
    echo "Examples:"
    echo "  - HEAD~10..HEAD (last 10 commits)"
    echo "  - main..feature (commits in feature branch not in main)"
    echo "  - Press Enter for all commits"
    read -r RANGE

    if [ -z "$RANGE" ]; then
        RANGE="--all"
    fi

    color "yellow"
    echo "Checking commits in range: "
    color "reset"
    echo "$RANGE"
}

# Initialize
check_git_repo
get_commit_range

# Get all commit hashes
if [ "$RANGE" = "--all" ]; then
    COMMITS=$(git log --format="%H")
else
    COMMITS=$(git log "$RANGE" --format="%H")
fi

# Check each commit message
for COMMIT in $COMMITS; do
    TOTAL_COMMITS=$((TOTAL_COMMITS + 1))
    COMMIT_MSG=$(git log --format=%B -n 1 "$COMMIT")
    COMMIT_SUBJECT=$(echo "$COMMIT_MSG" | head -n 1)
    COMMIT_DATE=$(git show -s --format=%ci "$COMMIT")
    COMMIT_AUTHOR=$(git show -s --format="%an <%ae>" "$COMMIT")
    PARENT_COUNT=$(git rev-list --parents -n 1 "$COMMIT" | awk '{print NF - 1}')

    echo
    color "yellow"
    echo -n "Commit: "
    color "reset"
    echo "${COMMIT:0:8} - $COMMIT_DATE - $COMMIT_AUTHOR"
    echo "  $COMMIT_SUBJECT"

    # Check if it's a merge commit
    if [ $PARENT_COUNT -gt 1 ] && (echo "$COMMIT_SUBJECT" | grep -E "$PR_MERGE_PATTERN" >/dev/null || echo "$COMMIT_SUBJECT" | grep -E "$GIT_MERGE_PATTERN" >/dev/null); then
        color "blue"
        echo -n "  ➜ Merge commit (exempt from validation)"
        color "reset"
        echo
        MERGE_COMMITS=$((MERGE_COMMITS + 1))
        continue
    fi

    # Validate against semantic pattern
    if echo "$COMMIT_SUBJECT" | grep -E "$PATTERN" >/dev/null; then
        color "green"
        echo -n "  ✓ Valid semantic commit"
        color "reset"
        echo
        VALID_COMMITS=$((VALID_COMMITS + 1))
    else
        color "red"
        echo -n "  ✗ Invalid commit message"
        color "reset"
        echo
        color "yellow"
        echo -n "    Should follow pattern:"
        color "reset"
        echo " type(scope): message"
        INVALID_COMMITS=$((INVALID_COMMITS + 1))
    fi
done

# Print summary
echo
color "yellow"
echo "========== Validation Summary =========="
color "reset"
echo "Total commits checked:       ${TOTAL_COMMITS}"

color "green"
echo -n "Valid semantic commits:      ${VALID_COMMITS}"
color "reset"
echo

color "blue"
echo -n "Merge commits (exempted):    ${MERGE_COMMITS}"
color "reset"
echo

color "red"
echo -n "Invalid semantic commits:    ${INVALID_COMMITS}"
color "reset"
echo

# Print percentage
if [ $TOTAL_COMMITS -gt 0 ]; then
    VALID_PERCENT=$((($VALID_COMMITS + $MERGE_COMMITS) * 100 / $TOTAL_COMMITS))
    echo "Compliance rate:             ${VALID_PERCENT}%"

    if [ $INVALID_COMMITS -gt 0 ]; then
        echo
        color "yellow"
        echo "Recommendations:"
        color "reset"
        echo "- Review invalid commits and consider amending them for consistency"
        echo "- Run this script periodically to ensure commit message standards"
    else
        echo
        color "green"
        echo "All commits comply with semantic commit standards!"
        color "reset"
    fi
fi

exit 0