Fancy Markdown Git Changelog in 25 lines or less

gitchangelog.sh

#!/bin/bash

OUT="changelog.md"
echo "$(basename $(git rev-parse --show-toplevel)) Changelog" > $OUT
echo "----------------------" >> $OUT
echo >> $OUT

git log --format=format:"  - %d %s" \
    | sed -e '/Merge /d' \
          -e '/Update/d' -e '/update/d' \
          -e '/README/d' -e '/readme/d' \
          -e '/AUTHORS/d' -e '/COPYING/d' -e '/LICENSE/d' \
          -e '/authors/d' -e '/copying/d' -e '/license/d' \
          -e '/WIP/d' \
          -e '/ci skip/d' \
          -e '/skip ci/d' \
    | sed -e 's/[ \t]*-[ \t]*(tag: \([^)]\+\)) \(.*\)/\n**v\1**\n\n  -  \2/g' \
    | sed -e 's/[ \t]*-[ \t]*([^)]\+, tag: \([^)]\+\), [^)]\+, [^)]\+) \(.*\)/**v\1**\n\n  -  \2/g' \
    | fold -s \
    | sed -e '/^\(  -\|\*\*\)/!s/^/     /' \
    | sed -e 's/\[.*\]/`&` /g' \
    | sed -e 's/[a-zA-Z0-9_]\+([a-zA-Z0-9, ]*)/`&`/g' \
    | sed -e 's/[a-zA-Z]\+_[a-zA-Z0-9_]*/`&`/g' \
    >> $OUT