#!/bin/bash

REPOSFILE=(~/.git_repos)

if [ -n "$1" ]; then
    REPOSFILE="$1"
fi

saveIFS="$IFS"
IFS=$'\n'
LINES=($(<"$REPOSFILE"))
IFS="$saveIFS"

# Set defaults to user's homedir and no group (e.g., subdir)
WORKSPACE=$HOME
GRP=""
for LINE in "${LINES[@]}"; do
    if [ ${LINE:0:1} = '#' ] || [ -z $LINE ]; then
        # Comment or empty line encountered, skip
        #echo "comment or empty line"
        continue
    fi

    if [ ${LINE:0:10} = 'workspace=' ]; then
        length=${#LINE}
        WORKSPACEDIR=`echo $LINE | cut -d'=' -f 2`
        if [ -z $WORKSPACEDIR ]; then
            WORKSPACE=$HOME
        else
            WORKSPACE="$HOME/$WORKSPACEDIR"
        fi
        echo "workspace: $WORKSPACE"
        # Reset GRP, as we enter a new workspace
        GRP=""
        GPRDIR=""

        if [ ! -e $WORKSPACE ]; then
            mkdir -p $WORKSPACE
        fi
        continue
    fi

    if [ ${LINE:0:6} = 'group=' ]; then
        GRP=`echo $LINE | cut -d'=' -f 2`
        if [ ! -z $GRP ]; then
            GRPDIR=$WORKSPACE/$GRP
        else
            GRPDIR=$WORKSPACE
        fi
        continue
    fi

    if [ ! -e $GRPDIR ]; then
        mkdir $GRPDIR
    elif [ -f $GRPDIR ]; then
        echo -e "[\e[31mX\e[0m] Group directory already exists as file: $GRPDIR"
        exit 1
    fi

    cd $GRPDIR
    REPODIR=$(basename "$LINE")
    #extension="${filename##*.}"
    REPODIR="${REPODIR%.*}"
    if [ -e $REPODIR ]; then
        cd $REPODIR

        git remote update &> /dev/null

        LOCAL=$(git rev-parse @)
        REMOTE=$(git rev-parse @{u})
        BASE=$(git merge-base @ @{u})

        # 31: red, 32: green, 33: orange/yellow
        if ! git diff --quiet; then
            echo -e "[\e[31mX\e[0m] $GRP/$REPODIR changed - $WORKSPACE/$GRP/$REPODIR"
        elif [ $LOCAL = $REMOTE ]; then
            # Up-to-date
            echo -e "[\e[32m-\e[0m] $GRP/$REPODIR"
        elif [ $LOCAL = $BASE ]; then
            # Need to pull
            echo -e "[\e[33mU\e[0m] $GRP/$REPODIR"
            git pull --all --quiet
        elif [ $REMOTE = $BASE ]; then
            # Need to push
            echo -e "[\e[33mP\e[0m] $GRP/$REPODIR pushing"
            git push --all --quiet
            git push --tags --quiet
        else
            # Diverged
            echo -e "[\e[31mX\e[0m] $GRP/$REPODIR diverged - $WORKSPACE/$GRP/$REPODIR"
        fi
    else
        echo -e "[\e[33mC\e[0m] $GRP/$REPODIR"
        git clone --quiet $LINE
    fi
done