#!/bin/bash
#
# usage:
#    ./make-release --dry-run|--real <branch>
# eg
#    ./make-release --dry-run main

#---------- argument parsing and options ----------

set -e

fail () { echo >&2 "${0##*/}: error: $*"; exit 12; }

dryrun=x-dry-run-unset
cargo_dryrun=--not-a-cargo-option-please-crash

case "$#.$1" in
2.--real)    dryrun=x     ; cargo_dryrun=''         ; ;;
2.--dry-run) dryrun=dryrun; cargo_dryrun='--dry-run'; ;;
*)           fail "bad usage" ;;
esac

keyid=0x559AE46C2D6B6D3265E7CBA1E3E3392348B50D39

branch="$2"

dryrun () { echo "WOULD  $*"; }
x () { echo >&2 "+ $*"; "$@"; }

trouble=false
trouble () { echo >&2 "***TROUBLE***: $*"; trouble=true; }

#---------- checks ----------

version=$(perl <Cargo.toml -ne '
    next unless m{^version\s*=\s*\"([0-9.]+)\"\s*$};
    print "$1\n" or die $!;
    exit 0;
')

case "$version" in
'') fail "no version?" ;;
esac

echo "version $version"

equals () {
    diff <(git rev-parse refs/heads/$1) <(git rev-parse HEAD) \
	|| trouble "HEAD not equal to $1"
}

equals $branch
equals tested

bad=$(git status --porcelain)
if [ "x$bad" != x ]; then
    printf >&2 '%s\n' "$bad"
    trouble 'tree is dirty'
fi

tag="otter-$version"
tag_exists=$(git for-each-ref "[r]efs/tags/$tag")
if [ "x$tag_exists" != x ]; then trouble "tag $tag already exists"; fi

head -1 CHANGELOG.md | grep "^Version $version" \
|| trouble "CHANGELOG.md not updated"

cargo_order='base . daemon wasm apitest wdriver'
missing=(git ls-files :\*/Cargo.toml :Cargo.toml)
for x in $cargo_order; do missing+=(:!$x/Cargo.toml); done
missing=$( "${missing[@]}" )
if [ "x$missing" != x ]; then trouble "missing cargo package(s) $missing"; fi

#---------- end of checks ----------

if $trouble; then
    $dryrun fail "trouble! checks failed!"
else
    echo 'checks passed'
fi

#---------- actually do the work ----------

$dryrun git push chiark $branch
$dryrun git push origin $branch

#---------- non-idempotent things ----------

$dryrun make -j12 publish

$dryrun git tag -s -u "$keyid" -m "Otter v$version" $tag
$dryrun git push chiark $tag
$dryrun git push origin $tag


for cargo_dir in $cargo_order; do
    $dryrun_no_more_cargo \
    nailing-cargo --no-nail --linkfarm=git --- \
        sh -xec "
          find . ! -type l ! -type d ! -path './target/*' -print0 \
              | xargs -0r rm --
          cd $cargo_dir; cargo publish $cargo_dryrun
        "
    dryrun_no_more_cargo=$dryrun

done

#---------- finish ----------

$dryrun cat <<END


Successfully released to
  - git tags
  - all git branches
  - cargo publish

Consider
  - make deploy

You need to write release announcements
  - sgo-software-announce
  - blog

END