wip-pr

#!/bin/bash

# Description:
#   Backlog + git-flow + WIP PR script

# Usage:
#   wip-pr pj-123
#
# Requirement:
#   use Mac OS X
#   install git
#   install hub
#   install backlog-cli@0.2.0
#   create master repository
#   create backlog issue
#   cd /path/to/your/repository
#   git checkout develop
#
# Note:
#   brew install git
#   brew install hub
#   npm install -g backlog-cli@0.2.0
#

declare -r SCRIPT_NAME=${0##*/}

declare -r DEFAULT_BACKLOG_USERNAME="$WIP_PR_BACKLOG_USERNAME"
declare -r DEFAULT_GITHUB_USERNAME="$WIP_PR_GITHUB_USERNAME"
declare -r DEFAULT_GITHUB_UPSTREAM_USERNAME="$WIP_PR_GITHUB_UPSTREAM_USERNAME"

print_usage()
{
  cat << EOF
Usage: $SCRIPT_NAME [-f] [-b NAME1] [-g NAME2] [-u NAME3] PROJECT_NAME ISSUE_NUMBER
Backlog + git-flow + WIP pull request script.
This script performs following steps.

  Create feature branch
  Push empty commit, so create feature branch in origin repository
  Send pull request to upstream repository
  Update backlog issue

  -b           specify backlog username
  -g           specify github username
  -u           specify github upstream username
  -f           never prompt
  -h           display this help and exit

Examples:
  $SCRIPT_NAME proj 120
  $SCRIPT_NAME -f proj 120

ENVIRONMENT VARIABLES:
  WIP_PR_BACKLOG_USERNAME  specifies default backlog username
  WIP_PR_GITHUB_USERNAME  specifies default github username
  WIP_PR_GITHUB_UPSTREAM_USERNAME  specifies default github upstream username
EOF
}

print_error()
{
  echo "$SCRIPT_NAME: $@" 1>&2
  echo "Try \`-h' option for more information." 1>&2
}

# $1 = $2 => 0
# $1 > $2 => 1
# $1 < $2 => 2
compare_version() {
  if [[ "$1" == "$2" ]]; then
    return 0
  fi

  local IFS=.
  local i ver1=($1) ver2=($2)
  # fill empty fields in ver1 with zeros
  for ((i=${#ver1[@]}; i<${#ver2[@]}; i++)); do
    ver1[i]=0
  done

  for ((i=0; i<${#ver1[@]}; i++)); do
    if [[ -z "${ver2[i]}" ]]; then
      # fill empty fields in ver2 with zeros
      ver2[i]=0
    fi

    if ((10#${ver1[i]} > 10#${ver2[i]})); then
      return 1
    fi
    if ((10#${ver1[i]} < 10#${ver2[i]})); then
      return 2
    fi
  done

  return 0
}

required_commands_are_installed()
{
  installed=0

  if ! which git > /dev/null 2>&1; then
    echo "git isn't installed" 1>&2
    echo "Try 'brew install git'" 1>&2
    installed=1
  fi

  if ! which hub > /dev/null 2>&1; then
    echo "hub isn't installed" 1>&2
    echo "Try 'brew install hub'" 1>&2
    installed=1
  fi

  if ! which backlog > /dev/null 2>&1; then
    echo "backlog isn't installed" 1>&2
    echo "Try 'npm install -g backlog-cli'" 1>&2
    installed=1
  else
    local backlog_cli_version=$(backlog --version)
    compare_version "$backlog_cli_version" "0.2.0"
    if [[ $? -eq "2" ]]; then
      echo "need backlog cli version 0.2.0 or later" 1>&2
      echo "Try 'npm install -g backlog-cli'" 1>&2
      installed=1
    fi
  fi

  return $installed
}

force=1

backlog_username="$DEFAULT_BACKLOG_USERNAME"
github_username="$DEFAULT_GITHUB_USERNAME"
github_upstream_username="$DEFAULT_GITHUB_UPSTREAM_USERNAME"

while getopts ':b:g:u:fh' option; do
  case $option in
    b)
      backlog_username="$OPTARG"
      ;;
    g)
      github_username="$OPTARG"
      ;;
    u)
      github_upstream_username="$OPTARG"
      ;;
    f)
      force=0
      ;;
    h)
      print_usage
      exit 0
      ;;
    :)
      print_error "option requires an argument -- $OPTARG"
      exit 1
      ;;
    *)
      print_error "invalid option -- $OPTARG"
      exit 1
      ;;
  esac
done
shift $(expr $OPTIND - 1)

if ! required_commands_are_installed; then
  exit 1
fi

if [[ $(git rev-parse --is-inside-work-tree 2> /dev/null) != 'true' ]]; then
  print_error "Not in a git repository"
  exit 1
fi

if [[ "$(git symbolic-ref HEAD 2>/dev/null)" != 'refs/heads/develop' ]]; then
  print_error "Not in develop branch"
  exit 1
fi

if [[ -z "$backlog_username" ]]; then
  print_error "You must specify backlog_username"
  exit 1
fi

if [[ -z "$github_username" ]]; then
  print_error "You must specify github_username"
  exit 1
fi

if [[ -z "$github_upstream_username" ]]; then
  print_error "You must specify github_upstream_username"
  exit 1
fi

# parse args
project=$(echo $1 | tr '[:lower:]' '[:upper:]')
issue_no=$2
issue_key="${project}-${issue_no}"

if [[ -z "$project" ]]; then
  print_error "You must specify project name"
  exit 1
fi

if [[ -z "$issue_no" ]]; then
  print_error "You must specify issue number"
  exit 1
fi

# fetch issue info
issue_summary=$(backlog issue info ${issue_key} -f summary)
issue_url=$(backlog issue info ${issue_key} -f url)
test -n "${issue_summary}" || exit 1
test -n "${issue_url}" || exit 1

# prompt
if [[ "$force" == "0" ]]; then
  echo ${issue_summary} 1>&2
  echo ${issue_url} 1>&2
  read -p 'OK? [yN]' yn
  test "${yn}" = 'y' -o "${yn}" = 'Y' || exit 0
fi

# exit immediately if any command return error
set -e

# commit & push
git checkout -b feature/${issue_no}
git commit --allow-empty -m "[WIP] ${issue_key} ${issue_summary}"
# TODO : ${github_username} is origin??
git push ${github_username} feature/${issue_no}

# pull request
pull_request_url=$(
  {
    echo "[WIP] ${issue_key} ${issue_summary}"
    echo ""
    echo "${issue_url}"
  } | \
  hub pull-request \
    -F - \
    -b "${github_upstream_username}:develop" \
)

# update issue
backlog issue status ${issue_key} 2 \
  --assigner ${backlog_username} \
  --comment ${pull_request_url}