docs: add a changelog and the release notes flow
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#!/usr/bin/env bash
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#
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# Builds the GitHub release notes for a tag, the way big projects such as
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# Immich lay them out: the hand-written entry from CHANGELOG.md (a welcome,
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# the highlights), a support section, then every commit since the last
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# release, sorted by kind, and a link to the full changelog.
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#
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# .github/release-notes.sh v1.2.0 the notes
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# .github/release-notes.sh --title v1.2.0 the title (checks the entry exists)
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#
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# Commit authors come from the GitHub API through gh. Without it the list
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# goes without them.
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set -euo pipefail
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cd -- "$(dirname -- "${BASH_SOURCE[0]}")/.."
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title=0
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if [[ ${1:-} == --title ]]; then
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title=1
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shift
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fi
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tag="${1:?usage: release-notes.sh [--title] vX.Y.Z}"
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if ! grep -qx "## $tag" CHANGELOG.md; then
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echo "CHANGELOG.md has no entry for $tag. Add \"## $tag\" first." >&2
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exit 1
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fi
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if (( title )); then
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printf '%s\n' "$tag"
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exit 0
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fi
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repo="${GITHUB_REPOSITORY:-$(git remote get-url origin | sed -E 's#^.*github\.com[:/]##; s#\.git$##')}"
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name="${repo#*/}"
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# The entry: up to the next one, without the date line (GitHub shows the
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# date), one heading level up, outside code blocks.
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entry="$(awk -v h="## $tag" '
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$0 == h { on = 1; next }
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on && /^## / { exit }
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!on { next }
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/^```/ { code = !code }
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!code && /^_[0-9]{4}-[0-9]{2}-[0-9]{2}_$/ { next }
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!code && /^###/ { sub(/^#/, "") }
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{ print }
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' CHANGELOG.md | sed -e '/./,$!d')"
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# The commits: from the last release, or from the start. A tag that does not
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# exist yet is a preview of what HEAD would become.
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if git rev-parse -q --verify "refs/tags/$tag" > /dev/null; then
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target="$tag"
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prev="$(git describe --tags --abbrev=0 --match 'v[0-9]*' "$tag^" 2>/dev/null || true)"
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else
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target="$(git rev-parse HEAD)"
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prev="$(git describe --tags --abbrev=0 --match 'v[0-9]*' HEAD 2>/dev/null || true)"
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fi
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declare -A login=()
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if command -v gh > /dev/null; then
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if [[ -n $prev ]]; then
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api=(api "repos/$repo/compare/$prev...$target" --jq '.commits[] | [.sha, (.author.login // "")] | @tsv')
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else
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api=(api --paginate "repos/$repo/commits?sha=$target&per_page=100" --jq '.[] | [.sha, (.author.login // "")] | @tsv')
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fi
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while IFS=$'\t' read -r sha who; do
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[[ -n $who ]] && login[$sha]="$who"
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done < <(gh "${api[@]}" 2>/dev/null || true)
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fi
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declare -A list=()
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count_maint=0
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while IFS=$'\t' read -r sha subject body; do
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# Version bumps say nothing a reader needs.
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[[ $subject =~ ^(chore:\ )?($name\ )?v?[0-9]+\.[0-9]+\.[0-9]+$ ]] && continue
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case "$subject" in
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*!:*) kind=breaking ;;
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feat:* | feat\(*) kind=feat ;;
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fix:* | fix\(*) kind=fix ;;
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perf:* | perf\(*) kind=enh ;;
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docs:* | docs\(*) kind=docs ;;
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chore* | ci:* | ci\(* | build* | refactor* | test* | style*) kind=maint ;;
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# Older commits without a prefix, sorted by what they say.
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*README* | *readme* | *Readme*) kind=docs ;;
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Add\ * | Put\ * | Introduce\ *) kind=feat ;;
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Fix\ * | Repair\ * | Recover\ * | Stop\ *) kind=fix ;;
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*\ *) kind=enh ;;
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*) kind=maint ;;
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esac
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[[ $body == *"BREAKING CHANGE"* ]] && kind=breaking
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[[ $subject == "Initial commit" ]] && kind=maint
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line="* $subject"
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[[ -n ${login[$sha]:-} ]] && line+=" by @${login[$sha]}"
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line+=" in https://github.com/$repo/commit/$sha"
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list[$kind]+="$line"$'\n'
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[[ $kind == maint ]] && count_maint=$((count_maint + 1))
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done < <(git log --reverse --no-merges --format='%H%x09%s%x09%b%x1e' "${prev:+$prev..}$target" | tr '\n\036' ' \n' | sed 's/^ //')
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changes=''
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for pair in "breaking:🚨 Breaking Changes" "feat:🚀 Features" "enh:🌟 Enhancements" "fix:🐛 Bug fixes" "docs:📚 Documentation"; do
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kind="${pair%%:*}"
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[[ -n ${list[$kind]:-} ]] || continue
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changes+="### ${pair#*:}"$'\n'"${list[$kind]}"
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done
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if [[ -n ${list[maint]:-} ]]; then
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changes+=$'\n'"<details><summary>🧰 Maintenance ($count_maint)</summary>"$'\n\n'"${list[maint]}"$'\n'"</details>"$'\n'
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fi
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if [[ -n $prev ]]; then
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full="**Full Changelog**: https://github.com/$repo/compare/$prev...$tag"
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else
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full="**Full Changelog**: https://github.com/$repo/commits/$tag"
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fi
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# A release with highlights is a big one: it gets a heading and the support
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# section, as in Immich. A patch is a sentence or two and the list.
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if grep -q '^## Highlights$' <<< "$entry"; then
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cat <<EOF
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# 🚀 $name $tag
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$entry
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## ☕ Support $name
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If $name is useful to you, you can buy me a coffee. It keeps these tools going. Found a bug or have an idea? Tell me in the [issues](https://github.com/$repo/issues).
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<a href="https://buymeacoffee.com/felitendo"><img src="https://cdn.buymeacoffee.com/buttons/v2/default-yellow.png" alt="Buy Me A Coffee" height="48"></a>
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----
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EOF
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else
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printf '%s\n\n' "$entry"
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fi
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printf "## What's Changed\n%s\n\n%s\n" "$changes" "$full"
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