#!/usr/bin/env bash

#
# Echo <msg> and exit
#

abort() {
  echo >&2 "$@"
  exit 1
}

#
# Produce json with <title>, <body>, <head> and <base>
#

json() {
  local title="${1//\"/\\\"}"
  local body="${2//\"/\\\"}"
  local head="${3//\"/\\\"}"
  local base="${4//\"/\\\"}"
  cat <<EOF
{
  "title": "$title",
  "body": "$body",
  "head": "$head",
  "base": "$base"
}
EOF
}

# user

user=$(git config user.email)
test -z "$user" && abort "git config user.email required"

# branch

branch=${1-$(git symbolic-ref HEAD | sed 's/refs\/heads\///')}

# make sure it's pushed

git push origin "$branch" || abort "failed to push $branch"

origin=$(git config remote.origin.url)
if [[ $origin == git@* ]]; then
    project=${origin##*:}
else
    project=${origin#https://*/}
fi
project=${project%.git}

# prompt

echo
echo "  create pull-request for $project '$branch'"
echo
printf "  title: " && read -r title
printf "  body: " && read -r body
printf "  base [master]: " && read -r base
echo

# create pull request

if [ -z "$base" ]
then
    base="master"
fi

body=$(json "$title" "$body" "$branch" "$base")

curl -u "$user" "https://api.github.com/repos/$project/pulls" -d "$body"

