#!/bin/bash

# git-affecting
# @link https://gist.github.com/shadowhand/130dbcf6d9b01877797b
# @author shadowhand https://github.com/shadowhand
# @license MIT
#
# installation:
# save this file as git-affecting somewhere in your $PATH
# make it executable: chmod +x git-affecting
#
# optional:
# git config --global alias.af '! git affecting'
#
# usage:
# git affecting
# see all the branches that are modifying the file
# ???
# profit
#
# enjoy!
#

usage() {
    echo "usage: git affecting <file> [<file> ...]"
}

# changelog
#
# 0.0.1
# - initial release
#

version() {
    echo "switchbranch v0.0.1"
}

_affecting() {
    # First get all branches that are known to the origin
    local branches=$(git branch -a | grep "remotes/origin/" | grep -v "master")
    local found=0
    local GREEN="\033[0;32m"
    local BLANK="\033[0m"

    if [ -z "$1" ]; then
        usage
        exit 1
    fi

    for file in $@; do
        if [ $found -gt 0 ]; then
            echo " " # add newline from previous run
        fi
        found=0
        for branch in $branches; do
            git diff --name-only $branch $(git merge-base $branch master) | grep "$file" 2>&1 >/dev/null
            if [ $? -eq 0 ]; then
                if [ $found -eq 0 ]; then
                    found=1
                    echo -e "File $GREEN$file$BLANK changed in:"
                fi
                echo "- $branch" | sed -e 's/remotes\/origin\///'
            fi
        done
    done
    exit 0
}

main() {
    local command="$1"
    case $command in
        "version") version;;
        *) _affecting "$@";;
    esac
}

main "$@"