GitHub "open PR" script. Add somewhere in your path, then opening a PR is as easy as typing `pr` on the branch you want to open a PR for

pr

#!/usr/bin/env bash

# GitHub "Open Pull Request" script
#
# Add somewhere in your path, then opening a PR is as easy as typing `pr` while you're
# on the branch you want to open a Pull Request for
#
# NOTES:
# - If working from a fork, name your fork's remote "origin" and the main repo "upstream"
# - `pr <branch_name>` will open a PR against the branch you give - rather than "master".
# - Use `git config pr.defaultbranch <branch_name>` to tell this script the correct branch
#   to use by default (ie if your repos default branch is not "master")
# - If you're working against a GitHub enterprise instance, set the github URL with `git config pr.githuburl`
#   eg $ git config pr.githuburl "https://git.mycompany.com"
set -e

PUSH_ARGS=""
OPENBROWSER=1
LOCAL_BRANCH=`git branch | grep ^\* | sed 's/^* //'`
BOX=`uname -s`

while test $# -gt 0
do
    case "$1" in
        --force) PUSH_ARGS="--force"
            ;;
        -f) PUSH_ARGS="--force"
            ;;
        --no-browser) OPENBROWSER=0
            ;;
        -n) OPENBROWSER=0
            ;;
        *) MERGE_BRANCH=$1
            ;;
    esac
    shift
done

git push origin $LOCAL_BRANCH $PUSH_ARGS

set +e
ORIGIN_ORG_NAME=`git config remote.origin.url | sed -E 's/.*:(.*)\/.*/\1/'`
UPSTREAM_ORG_NAME=`git config remote.upstream.url | sed -E 's/.*:(.*)\/.*/\1/'`
REPO_NAME=`git config remote.upstream.url | sed -E 's/.*\/([^\/]*)\.git/\1/'`
GITHUB_URL=`git config pr.githuburl`
set -e

if [ "$GITHUB_URL" == "" ]; then
    GITHUB_URL=https://github.com
fi
if [ "$MERGE_BRANCH" == "" ]; then
    set +e
    MERGE_BRANCH=`git config pr.defaultbranch`
    if [ "$MERGE_BRANCH" == "" ]; then
        MERGE_BRANCH=master
    fi
    set -e
fi

if [ "$ORIGIN_ORG_NAME" == "" ]; then
    echo Cannot divine the origin organisation name. Ensure you have a remote called "origin"
    exit 1
fi
if [ "$UPSTREAM_ORG_NAME" == "" ]; then
    UPSTREAM_ORG_NAME=$ORIGIN_ORG_NAME
fi
if [ "$REPO_NAME" == "" ]; then
    REPO_NAME=`git config remote.origin.url | sed -E 's/.*\/([^\/]*)\.git/\1/'`
fi

URL=$GITHUB_URL/$UPSTREAM_ORG_NAME/$REPO_NAME/pull/new/$MERGE_BRANCH...$ORIGIN_ORG_NAME:$LOCAL_BRANCH

if [ "$OPENBROWSER" == "1" ]; then
    echo Opening $URL
    if [ "$BOX" == "Linux" ]; then
        xdg-open $URL > /dev/null
    elif [ "$BOX" == "Darwin" ]; then
        open $URL
    else
        explorer.exe $URL
    fi
fi