mod-CmdMSG/hooks/post-commit

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#!/bin/bash
set -eu
# destination of the final changelog file
OUTPUT_FILE=CHANGELOG.md
# generate the changelog
git --no-pager log --no-merges --format="### %s%d%n>%aD%n%n>Author: %aN (%aE)%n%n>Commiter: %cN (%cE)%n%n%b%n%N%n" > $OUTPUT_FILE
# prevent recursion!
# since a 'commit --amend' will trigger the post-commit script again
# we have to check if the changelog file has changed or not
res=$(git status --porcelain | grep -c ".\$OUTPUT_FILE$")
if [ "$res" -gt 0 ]; then
git add $OUTPUT_FILE
git commit --amend
echo "Populated Changelog in $OUTPUT_FILE"
fi