prepare-commit-msg

#!/bin/bash

# Get the git diff
changes=$(git diff --cached --numstat)

# Initialize counters
additions=0
deletions=0
modifications=0

# Parse the diff stats
while read -r added deleted file; do
    if [ "$added" != "-" ] && [ "$deleted" != "-" ]; then
        if [[ "$file" == */* ]]; then
            if [ "$deleted" -eq 0 ]; then
                # Pure addition
                ((additions++))
            elif [ "$added" -eq 0 ]; then
                # Pure deletion
                ((deletions++))
            else
                # Modification (both added and deleted lines)
                ((modifications++))
            fi
        fi
    fi
    dir=$(dirname "$file")
done <<< "$changes"

# Determine the predominant change type
if [[ "$modifications" -gt 0 ]]; then
    prefix="updpatch:"
elif [[ "$additions" -gt 0 ]]; then
    prefix="addpatch:"
elif [[ "$deletions" -gt 0 ]]; then
    prefix="rmvpatch:"
else
    prefix="updconfig:"
fi

if [[ ! -z $dir ]]; then
    if [[ -f $WORKDIR/$dir/PKGBUILD ]]; then
        PKGVERREL=$(source $WORKDIR/$dir/PKGBUILD; echo $epoch${epoch:+:}$pkgver-$pkgrel)
    fi
fi

# Get the existing commit message
commit_msg=$(cat "$1")

if [[ $prefix == "updconfig:" ]]; then
    echo "$prefix$commit_msg" > "$1"
else
    echo "$prefix $dir, ver=$PKGVERREL$commit_msg" > "$1"
fi