pre-commit.template

#!/bin/bash

if git rev-parse --verify HEAD >/dev/null 2>&1; then
    against=HEAD
else
    # Initial commit: Diff against an empty tree object.
    against=4b825dc642cb6eb9a060e54bf8d69288fbee4904
fi

for file in $(git diff --cached --name-only --diff-filter=AM $against); do
    [[ "$file" != *.xml.lzma ]] && continue

    # Skip the check for a manually changed issue date when rebasing.
    [ -d ".git/rebase-merge" -o -d ".git/rebase-apply" ] && continue

    # Only bump the issue date if it has not been changed manually.
    git diff --cached --word-diff=porcelain -- "$file" | grep -q "^\+issue=" && continue

    issue=$(sed -nr 's/.* issue="([0-9]{10})">/\1/p' "$file")
    date=${issue:0:8}
    rev=${issue:8:2}

    today=$(date +%Y%m%d)
    if [ "$date" = "$today" ]; then
        let rev=rev+1
        rev="0${rev}"
    else
        rev="00"
    fi

    sed -i -r "s/(.* issue=\")[0-9]{10}(\">)/\1${today}${rev: -2}\2/" "$file"
    git add "$file"
done