#!/bin/bash
set -o errexit

# Version control status command for all subrepositories.
# For use with git-remote-hg:
#   http://felipec.wordpress.com/2012/11/13/git-remote-hg-bzr-2/

# Uncomment to have verbose debug output
#debug=1

print_usage()
{
    echo "$(basename $0) -- Version control subrepository status"
    echo "Usage: $(basename $0) [OPTIONS...]"
    echo "Options:"
    echo "  -h   display this help and exit"
    echo "  -m   display only subrepositories with local modifications"
}

# git-remote-hg doesn't work with Mercurial subpaths extension,
# so use it manually
hg_subpaths_config()
{
    subpaths=$(hg showconfig | grep "subpaths")

    if [ -n "${subpaths}" ]; then
        sp_src=${subpaths//subpaths./}
        sp_src=${sp_src//=*/}
        sp_src=${sp_src//\\/} # Remove windows separator (LSI)
        sp_dst=${subpaths//*=/}

        if [ -n "${debug}" ]; then
            echo "sp_src = $sp_src"
            echo "sp_dst = $sp_dst"
        fi
    fi
}

display_subrepo_name()
{
    COLOR_BLUE='\033[1;34m'
    COLOR_NORMAL='\033[0m'

    echo -en "${COLOR_BLUE}"
    echo "[${dest}]"
    echo -en "${COLOR_NORMAL}"
}

if [ "x${1}" = "x--help" ]; then
    print_usage
    exit 1
fi

if [ ! -f .hgsub ]; then
    echo "No Mercurial subrepositories found"
    exit 1
fi

if [ ! -f .gitignore ]; then
    # We do not want to track .gitignore itself
    echo ".gitignore" > .gitignore
fi

hg_subpaths_config

# Read lines from .hgsub
while read sub; do
    # Remove CR (DOS)
    sub="${sub//$'\r'/}"

    if [ "${sub}" != "" ]; then
        # Get subrepository URL
        src="${sub//*= /}"

        # Replace using subpaths extension content
        src=${src/${sp_src}/${sp_dst}}

        # Get subrepository local alias or label
        dest="${sub// =*}"

        # Get project ID (example: S0289)
        id=$(echo ${sub} | sed "s/.*\(S[0-9][0-9][0-9][0-9]\).*/\1/")

        if [ -n "${debug}" ]; then
            echo "repo: ${src}"
            echo "  id:     ${id}"
            echo "  src:    ${src}"
            echo "  dest:   ${dest}"
        fi

        if [ -d "${dest}" ]; then
            pushd "${dest}" 1> /dev/null

            changed=$(vs --porcelain)

            if [ -n "${changed}" ]; then
                display_subrepo_name
                vs -s
                echo # Blank line
            fi

            popd 1> /dev/null
        else
            display_subrepo_name
            echo "Error: missing local subrepository"
            echo # Blank line
        fi
    fi
done < .hgsub