#!/bin/sh
#
# Copyright © 2008 Mike O'Connor <stew@vireo.org>
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 2, or (at your option) any
# later version.
# 
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
# 
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
# USA.  

set -e

usage() {
    bn=$(basename $0)
    cat <<EOF
$0: manage home directory using mr

NAME
  $bn - a command to manage detached git repositories using mr

SYNOPSIS
  $bn command [options]

  $bn init
  $bn add repository_name
  $bn new repository_name file1 [file2 file3...]

COMMANDS
  init 
      create ~/.mrconfig

  add repository_name
      checkout the repository from the remote host and add it to
      mr's configuration

  new repository_name file1 [file2 file3...]  
      create a new repository on the remote host, and checkin the
      listed files to the new repository.   Add the new repository
      to mr's configuration
EOF

    exit 1
}


GIT_HOST=flounder.vireo.org
REMOTE_REPOS=~/git
LOCAL_REPOS=~/.fgits
MRCONFIG=~/.mrconfig
MOVEIN=~/.movein

[ -e source $MOVEIN ] && source $MOVEIN

init() {

    if [ $# -ne 0 ]; then 
	usage
    fi
    
    if [ -e $MRCONFIG ]; then
	echo $MRCONFIG already exists
	exit 1
    fi
    
    if [ -e $MOVEIN ]; then
	echo $MOVEIN already exists
	exit 1
    fi

    echo -n "git server hostname? [git.vireo.org] " 
    read GIT_HOST
    if [ -z "$GIT_HOST" ]; then 
	GIT_HOST=git.vireo.org
    fi

    echo -n "path to remote repositories? [~/git] " 
    read REMOTE_REPOS
    if [ -z "$REMOTE_REPOS" ]; then 
	REMOTE_REPOS=~/git
    fi

    echo -n "Local repository directory? [~/.fgit] " 
    read LOCAL_REPOS
    if [ -z "$LOCAL_REPOS" ]; then 
	LOCAL_REPOS=~/.fgits
    fi

    echo -n "Location of .mrconfig file? [~/.mrconfig] " 
    read MRCONFIG
    if [ -z "$MRCONFIG" ]; then 
	MRCONFIG=~/.mrconfig
    fi

    cat <<EOF > .movein
GIT_HOST=$GIT_HOST
REMOTE_REPOS=$REMOTE_REPOS
LOCAL_REPOS=$LOCAL_REPOS
MRCONFIG=$MRCONFIG
EOF

    mkdir $LOCAL_REPOS
    cat <<END > $MRCONFIG
[DEFAULT]
include = cat /usr/share/mr/git-fake-bare
END

    
}


add() {
    if [ $# -ne 1 ]; then 
	usage
    fi
    REPO_NAME=$1.git ; shift
    LOCAL_REPO=$LOCAL_REPOS/$REPO_NAME
    REPO_URL=ssh://$GIT_HOST/$REMOTE_REPOS/$REPO_NAME

    if [ -e "$LOCAL_REPO" ]; then
	echo $LOCAL_REPO already exists
	exit 1
    else
	trap "rm -rf $LOCAL_REPO" 0
	mkdir "$LOCAL_REPO"
	export GIT_DIR="$LOCAL_REPO"
	git init --bare
	git remote add origin $REPO_URL
	git config branch.master.remote origin
	git config branch.master.merge refs/heads/master
	git config core.worktree ../../
	git config core.bare false
	GIT_WORK_TREE="$PWD" git pull
	trap - 0
	cat <<END >> $MRCONFIG

[$LOCAL_REPO]
checkout = git_fake_bare_checkout '$REPO_URL' '$REPO_NAME' '../../'
END
    fi

}

new() {
    if [ $# -lt 2 ]; then 
	usage
    fi
    REPO_NAME=$1.git ; shift
    LOCAL_REPO="$LOCAL_REPOS/$REPO_NAME"
    REPO_URL="ssh://$GIT_HOST/$REMOTE_REPOS/$REPO_NAME"

    if [ ! -e "$1" ]; then
	echo $1 not found
	exit 1
    fi

    if [ -e "$LOCAL_REPO" ]; then
	echo $LOCAL_REPO already exists
	exit 1
    else
	trap "rm -rf $LOCAL_REPO" 0
	mkdir -p "$LOCAL_REPO"

	ssh $GIT_HOST "
               GIT_DIR=$REMOTE_REPOS/$REPO_NAME git --bare init
        " </dev/null

	export GIT_DIR="$LOCAL_REPO"
	git init --bare
	git remote add origin $REPO_URL
	git config branch.master.remote origin
	git config branch.master.merge refs/heads/master
	git config core.worktree ../../
	git config core.bare false
#	for file in  ; do 
	export GIT_WORK_TREE="$PWD"
	    git add "$@"
#	done
	git commit -m "initial checkin"
	git push --all
	
	trap - 0
	cat <<END >> $MRCONFIG

[$LOCAL_REPO]
checkout = git_fake_bare_checkout '$REPO_URL' '$REPO_NAME' '../../'
END
    fi

}

command=$1 ; shift
case "$command" in 
    init)
	init $@
	;;
    add)
        add $@
	;;
    new)
        new $@
	;;
esac