release

#!/usr/bin/env -S bash -e

token_file=token

cd "$(dirname "$0")" || exit

check_can_release() {
  local version="$1"

  type -P asciidoctor >/dev/null || usage "You need asciidoctor to make releases"

  if [ -n "$(git status --porcelain)" ]
  then
    git status >&2
    echo >&2
    usage "Please commit your pending changes first"
  fi

  [[ -z "$version" ]] && usage "No version specified on command line"
  echo "$version" | grep -E '^v[0-9]*\.[0-9]*\.[0-9]*$' >/dev/null || usage "Invalid format for version: $version"
  [ -r "$token_file" ] || usage "'$token_file' file does not exist"

  # shellcheck disable=1090
  source "$token_file"

  [[ -z "$user" ]]  && usage "user not found in file '$token_file'"
  [[ -z "$token" ]] && usage "token not found in file '$token_file'"
  true #avoid error on last instruction of function (see bash -e)
}

prepare_release() {
  set -x
  local version="$1"
  shift

  update_version "$version"
  update_man

  git add bash_unit
  git add docs/man/man1/bash_unit.1

  if [ $# -eq 0 ]
  then
    git commit -m "prepare release $version"
  else
    git commit -m "$*"
  fi

  git tag "$version"
}

update_version() {
  local version="$1"
  sed -i -e "s:^VERSION=.*:VERSION=$version:" bash_unit
}

update_man() {
  asciidoctor -D docs/man/man1 -d manpage -b manpage README.adoc
}

publish_release() {
  local version="$1"

  git push
  git push --tags
  curl  -u "$user:$token" -XPOST https://api.github.com/repos/pgrange/bash_unit/releases -d "
{
  \"tag_name\": \"$version\"
  }"
}

usage() {
  local message=$1

  cat >&2 <<EOF
$message

  $0 <version>  [release note]
Publishes a new release of bash_unit on github.
Version must respect [Semantic Versioning](http://semver.org/)
A token file must exist in the current working directory. This file must be of the form:
user=<user>
token=<token>

<user> is your github account.
<token> is your github api token. See https://github.com/settings/tokens
EOF

  exit 1
}

[[ $# -ge 1 ]] || usage "You must specify version on command line"
version=$1
shift

check_can_release "$version"

prepare_release "$version" "$@"
publish_release "$version"