Script to report stats on a Git project. Who's been working nights and weekends? (Spoiler alert: this guy)

git-statistics.sh

#!/bin/bash

# Pass project dir as a param (could be '.' for the current dir)
cd $1

if [ ! -d .git ]; then
    echo "This is not a valid git directory."
    exit 1
fi

# Convert email to a case-insensitive regex pattern
case_insensitive_pattern() {
    local email="$1"
    local pattern=""
    for (( i=0; i<${#email}; i++ )); do
        char="${email:$i:1}"
        if [[ "$char" =~ [a-zA-Z] ]]; then
            lower=$(echo "$char" | tr '[:upper:]' '[:lower:]')
            upper=$(echo "$char" | tr '[:lower:]' '[:upper:]')
            pattern+="[$lower$upper]"
        else
            pattern+="$char"
        fi
    done
    echo "$pattern"
}

# Get stats for the given developer
process_commits() {
    local email="$1"
    local pattern=$(case_insensitive_pattern "$email")
    echo "$email:"

    # Total commits
    total_commits=$(git log --author="$pattern" --oneline | wc -l)

    # Commits before noon
    before_noon=$(git log --author="$pattern" --pretty=format:'%ad' --date=format:'%H:%M' | awk -F: '$1 < 12' | wc -l)

    # Commits between noon and 5pm
    noon_to_5pm=$(git log --author="$pattern" --pretty=format:'%ad' --date=format:'%H:%M' | awk -F: '$1 >= 12 && $1 < 17' | wc -l)

    # Commits after 5pm
    after_5pm=$(git log --author="$pattern" --pretty=format:'%ad' --date=format:'%H:%M' | awk -F: '$1 >= 17' | wc -l)

    # Commits on weekends (note these might be double counting some of what's above)
    weekend_commits=$(git log --author="$pattern" --pretty=format:'%ad' | grep -E '^(Sat|Sun)' | wc -l)

    echo "  Total commits:       $total_commits"
    echo "  Commits before noon: $before_noon"
    echo "  Commits from 12-5pm: $noon_to_5pm"
    echo "  Commits after 5pm:   $after_5pm"
    echo "  Commits on weekends: $weekend_commits"
    echo ""
}

echo -e "Getting git statistics...\n"

# Get list of authors
authors=$(git log --format='%aE' | sort -uf)

# Process each author
while IFS= read -r author; do
    process_commits "$author"
done <<< "$authors"