#!/bin/sh
# Release one workflow: bump its version, date its changelog, commit, tag,
# package, then (after confirmation) push, publish the package on the tag
# and redeploy the site.
#
#   scripts/release <name> major|minor|patch [--dry-run]
#
# --dry-run does everything up to the package, shows the release commit, then
# undoes the commit and tag. The package stays in dist/.
set -eu

die() {
  echo "error: $*" >&2
  exit 1
}

usage="usage: scripts/release <name> major|minor|patch [--dry-run]"
[ $# -eq 2 ] || [ $# -eq 3 ] || die "$usage"
name=$1
bump=$2
dry_run=false
if [ $# -eq 3 ]; then
  [ "$3" = --dry-run ] || die "$usage"
  dry_run=true
fi
root=$(cd "$(dirname "$0")/.." && pwd)
cd "$root"
dir=workflows/$name
[ -d "$dir" ] || die "no workflow at $dir"

[ -z "$(jj diff --summary)" ] || die "the working copy has changes"
[ "$(jj log --no-graph -r @- -T commit_id)" = "$(jj log --no-graph -r main -T commit_id)" ] ||
  die "the working copy's parent isn't main"

# The Unreleased section becomes the release notes.
notes=$(awk '/^## Unreleased/ { f = 1; next } /^## / { f = 0 } f' "$dir/CHANGELOG.md" |
  sed -e '/./,$!d')
[ -n "$notes" ] || die "nothing under ## Unreleased in $dir/CHANGELOG.md"

current=$(sed -n 's/^version = "\(.*\)"$/\1/p' "$dir/Cargo.toml" | head -1)
IFS=. read -r major minor patch <<EOF
$current
EOF
case "$bump" in
major) version=$((major + 1)).0.0 ;;
minor) version=$major.$((minor + 1)).0 ;;
patch) version=$major.$minor.$((patch + 1)) ;;
*) die "bump must be major, minor or patch" ;;
esac
tag=$name-v$version
display=$(plutil -extract name raw "$dir/workflow/info.plist")
git rev-parse -q --verify "refs/tags/$tag" >/dev/null && die "tag $tag already exists"

echo "Releasing $display $current -> $version"
start=$(jj op log -n 1 --no-graph -T 'id.short()')

sed -i '' "1,/^version = /s/^version = \".*\"$/version = \"$version\"/" "$dir/Cargo.toml"
plutil -replace version -string "$version" "$dir/workflow/info.plist"
cargo metadata --format-version 1 --offline >/dev/null # updates Cargo.lock

changelog=$(awk -v heading="## $version - $(date +%Y-%m-%d)" \
  '{ print } /^## Unreleased/ { print ""; print heading }' "$dir/CHANGELOG.md")
printf '%s\n' "$changelog" >"$dir/CHANGELOG.md"

# The site's data (and its download link) now sees the dated changelog.
site/scripts/workflow-data >/dev/null

jj --quiet commit -m "Release $display $version"
jj --quiet sign -r @- # sign now, so pushing doesn't rewrite the tagged commit
jj --quiet bookmark move main --to @-
commit=$(jj log --no-graph -r main -T commit_id)
# verbatim: the notes' "### Added" headings would otherwise be stripped as
# comments.
git tag -a --cleanup=verbatim "$tag" -m "$display $version" -m "$notes" "$commit"

package=$(scripts/package "$name" "$tag")

if $dry_run; then
  echo
  jj show --stat -r main
  echo
  git tag -n99 -l "$tag"
  git tag -d "$tag" >/dev/null
  jj --quiet op restore "$start"
  echo
  echo "Dry run: undid the release commit and tag. Package: $package"
  exit 0
fi

echo
echo "Tagged $tag and built $package."
printf 'Push, publish the package and deploy the site? [y/N] '
read -r answer
if [ "$answer" != y ]; then
  echo "Stopped before pushing. To undo: git tag -d $tag && jj op restore $start"
  exit 0
fi

jj git push --bookmark main
git push origin "refs/tags/$tag"
scripts/publish-artifact "$tag" "$package"
site/scripts/deploy