modman-inport

#!/bin/bash -x

set -e

pushd `dirname $0` > /dev/null
SCRIPTPATH=`pwd`
popd > /dev/null
SCRIPT="$SCRIPTPATH/$(basename $0)"

#############################################################
# Echo in bold font if stdout is a terminal
ISTTY=0; if [ -t 1 ]; then ISTTY=1; fi
bold () { if [ $ISTTY -eq 1 ]; then tput bold; fi; }
unbold () { if [ $ISTTY -eq 1 ]; then tput sgr0; fi; }
echo_b ()
{
  if [ "$1" = "-e" ]; then
    echo -e "$(bold)$2$(unbold)"
  else
    echo "$(bold)$1$(unbold)"
  fi
}

#############################################################
# Colors in terminal
yellow () { if [ $ISTTY -eq 1 ]; then tput setaf 3; fi; }
red () { if [ $ISTTY -eq 1 ]; then tput setaf 1; fi; }

#############################################################
# Handling warning messages
warning ()
{
  echo -e "$(bold)$(yellow)WARNING:$(unbold) "$1
}

#############################################################
# Handling Error messages
error ()
{
  echo -e "$(bold)$(red)ERROR:$(unbold) "$1
}






#############################################################
#check modman file support
function check_modman {
	IFS=$'\r\n'
 	for line in $(grep -v -e '^#' -e '^\s*$' "$1"); do
		IFS=$' \t\n'

		# Split <target> <real>
    		read target real <<< $line

    		# Assume target == real if only one path is given
    		if [ -z "$real" ]; then
        		real="$target"
    		fi

    		# Sanity check for empty data
    		if [ -z "$target" -o -z "$real" ]; then
      			error "Invalid input in modman file ($relpath):\n $line"
      			return 1
    		fi

		# check for modman things not supported
		if [ "${taget:0:1}" -eq "@"  ]; then
			error "@ opperator not supported"
			return 1
		fi
	done
	return 0
}


#############################################################
#filter the current git branch to the modman targets

function do_modman_filter {
	FILE=$1
	GITKEEP=""

	#$* are now the git arguments
	shift



	#parse the modman file into a list of dirs/files to keep in the git repo
	IFS=$'\r\n'
 	for line in $(grep -v -e '^#' -e '^\s*$' "$FILE"); do
		IFS=$' \t\n'

		# Split <target> <real>
    		read target real <<< $line

    		# Assume target == real if only one path is given
    		if [ -z "$real" ]; then
        		real="$target"
    		fi

    		# Sanity check for empty data
    		if [ -z "$target" -o -z "$real" ]; then
      			error "Invalid input in modman file ($relpath):\n $line"
      			return 1
    		fi

		if [ -z "$GITKEEP" ]; then
			GITKEEP="git reset -q \$GIT_COMMIT -- $real"
		else
			GITKEEP="$GITKEEP;git reset -q \$GIT_COMMIT -- $real"
		fi
	done
	if [ -z "$GITKEEP" ]; then
		error "modman file empty?"
		return 1
	fi
	echo START FILTER

	rm -rf .git/refs/original/

	#first remove all files from the current tree and then only add what is sopesed to be kept
	git filter-branch --index-filter "git rm --cached -qr -- . ;$GITKEEP" --prune-empty

	echo DONE FILTER
}

#############################################################
#rebases the entire branch to remove (empty) merge commits
function do_git_rebase {
	rm -rf .git/refs/original/
	git rebase $(git log --pretty=format:%H|tail -1)
}


#############################################################
#moves the files in a repo to the new locations
function do_modman_move {
	FILE=$1
	#parse the modman file into a list of dirs/files to move in the git repo
	IFS=$'\r\n'
 	for line in $(grep -v -e '^#' -e '^\s*$' "$FILE"); do
		IFS=$' \t\n'

		# Split <target> <real>
    		read target real <<< $line
		error "$line"

    		# Assume target == real if only one path is given
    		if [ -z "$real" ]; then
        		real="$target"
    		fi

    		# Sanity check for empty data
    		if [ -z "$target" -o -z "$real" ]; then
      			error "Invalid input in modman file ($relpath):\n $line"
      			return 1
    		fi

		# ceck for if source and dest are the same
		if [ "$real" == "$target" ]; then
			continue
		fi

		echo START MOVING $target

		rm -rf .git/refs/original/

		git filter-branch --tree-filter "mkdir -p `dirname $target`; test $real && mv $real $target || true"

		echo DONE MOVING $target
	done
}



function start {
	if [ -f "$1" ]; then
		check_modman $1
		do_modman_filter $*
		do_git_rebase $*
		do_modman_move $*
		echo "DONE"
	else
		echo "please specify the Modman file location"
	fi
}









cmd=$1
shift
$cmd $*