#!/bin/bash
set -o errexit

SCRIPT="`readlink -e $0`"
SCRIPTPATH=$(dirname ${SCRIPT})
source ${SCRIPTPATH}/hv-hg-functions.sh

# 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) -- HG subrepository importer for git-remote-hg"
    echo "Usage: $(basename $0) [OPTIONS...]"
}

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

asm=$(cat .git/config | grep "hg::" | sed "s/.*url = hg::\(.*\)/\1/")
hg_parse_projrc ${asm}

hg_parse_subpaths

HGSUB_TMP="/tmp/$(basename $0).hgsub-$$.tmp"

# Create temporary copy to replace backslashes with slashes.
cat .hgsub | sed 's/\\/\//g' > ${HGSUB_TMP}

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

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

        # Replace using Mercurial subpaths substitutions (either projrc or from hgrc)
        src=$(apply_substitutions ${src})

        # Original name
        repo=$(basename "${src}")
        srcpath=$(dirname "${src}")

        # 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/")

        # Get revision of subrepository (remove CR from .hgsubstate)
        rev=$(cat .hgsubstate | tr -d '\r' | grep "${id}" | sed "s/ .*//")

        if [ -n "${debug}" ]; then
            echo "repo: ${repo}"
            echo "  path:  ${srcpath}"
            echo "  id:    ${id}"
            echo "  local: ${dest}"
            echo "  rev:   ${rev}"
        fi

        if [ ! -d "${dest}" ]; then
            subrepo_find_branch "${src}" ${id} ${rev}

            # git-remote-hg seems to replace
            #   "BRANCH - NAME"
            # with
            #   "BRANCH___-___NAME"
            branch="${branch// /___}"

            if [ -n "${debug}" ]; then
                echo "branch: ${branch}"
            fi

            git clone "hg::${src}" "${dest}"

            cd "${dest}"

            if [ -x ${HOME}/scripts/git-set-local-author.sh ]; then
                # Make sure commits have correct author for LSI
                ${HOME}/scripts/git-set-local-author.sh
            fi

            if [ "x${branch}" != "xdefault" ]; then
                # Make tracking branch
                git checkout -f "branches/${branch}"

                # Adjusting git tree to specific commit specified in
                # .hgsubstate:
                # The SHA from hg and git are not the same, therefore, we must
                # find the commit sequence in hg and map this
                # to a hash in git using the ${num} variable:
                git_rev=$(git log --oneline | sed -n "${num}p" | awk '{print $1}')
                git reset --hard ${git_rev}
            fi

            cd ..

            if ! grep -q "${dest}" .gitignore ; then
                # Ignore subrepo in top-level git repository
                echo "${dest}" >> .gitignore
            fi
        fi
    fi
done < ${HGSUB_TMP}

rm ${HGSUB_TMP}