#!/bin/sh
# Take a list of MSYS-compatible paths and convert them to native
# MS-Windows format.
# Status is zero if successful, nonzero otherwise.

VERSION='2013-11-09 10:48'; # UTC
# The definition above must lie within the first 8 lines in order
# for the Emacs time-stamp write hook (at end) to update it.
# If you change this file with Emacs, please let the write hook
# do its job.  Otherwise, update this string manually.

# Copyright (C) 2002-2013 Free Software Foundation, Inc.

# 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 3 of the License, 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, see <http://www.gnu.org/licenses/>.

usage="usage: $0 PATHLIST [MUSTEXIST] [SEPARATOR [SEPARATOR2]]"

help="$usage
  or:  $0 OPTION

Convert MSYS-compatible paths to MS-Windows native format.

PATHLIST should be a list of paths separated by SEPARATOR.  This list
will be written to the standard output after performing the following
transformations:
1. Empty paths will be discarded.
2. Backslashes will be replaced by forward slashed.
3. Two consecutive slashes will be replaced by a single one.
4. Each path will be translated to Windows-native format, using
   forward slashes (e.g. 'c:/foo/bar').  This translated path will
   never end with a slash.
5. Ocurrences of SEPARATOR2 withing the paths will be escaped with
   backslashes.
6. Different paths will be separated with SEPARATOR2.

If MUSTEXIST is 'Y' (or not supplied), then each path in PATHLIST must
exists.

If SEPARATOR is not supplied, PATHLIST will be regarded as a single
path.

If SEPARATOR2 is not supplied, it will take the same value as
SEPARATOR.

Options:
  --help     display this help and exit
  --version  output version information and exit

Report bugs to <bug-gnu-emacs@gnu.org>."

version=`expr "$VERSION" : '\([^ ]*\)'`
version="msys-to-w32 $version
Copyright (C) 2011 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law."

for arg
do
  case $arg in
    --help | --hel | --he | --h)
      exec echo "$help" ;;
    --version | --versio | --versi | --vers | --ver | --ve | --v)
      exec echo "$version" ;;
    --)
      shift
      break ;;
    -*)
      echo "$0: invalid option: $arg" >&2
      exit 1 ;;
    *)
      break ;;
  esac
done

{ test $# -ge 1 && test $# -le 4; } ||
{ echo "$0: $usage" >&2; exit 1; }

# Arguments
pathlist=$1
mustexist=${2:-Y}
separator=$3
separator2=${4:-${separator}}

# Split pathlist into its path components
if test -n "$separator"
then
    IFS=${separator} patharray=( $pathlist )
else
    patharray=( "$pathlist" )
fi

# Output pathlist
pathlist2=""

for p in "${patharray[@]}"
do
    # Skip empty paths
    test "$p" = "" && continue

    # Replace '\' with '/', '//' with '/' and remove the final slash
    # (if any).
    p=${p//"\\"/"/"}
    p=${p//\/\//"/"}
    test ${#p} -gt 1 && p=${p%"/"}

    if test -d "$p"
    then
	# The path exists, so just translate it
	p2=`cd "$p" && pwd -W`
    else
	# The path does not exists.  So, try to guess the
	# Windows-native translation

	test "${mustexist}" = "Y" &&
	{ echo "$0: invalid path: $p" >&2; exit 1; }
	
	# Look for the deepest existing directory in this path,
	# testing with partial paths by removing one component from
	# the right side in each iteration
	IFS=/ pcomponents=( $p )
	pa=$p

	for (( i=${#pcomponents[@]}-1 ; i>=0 ; i-- ))
	do

	    if test "${pcomponents[i]}" = ""
	    then
		# The path component is empty.  This can only mean
		# that the path starts with "/" and all components
		# have been stripped out already.  So in this case
		# "pa" must be set to the MSYS root directory
		pa="/"
	    else
		pa=${pa%"/${pcomponents[i]}"}
	    fi

	    if test -d "${pa}"
	    then

		# Translate the existing part
		p2=`cd "${pa}" && pwd -W`

		# Remainder
		pb="${p#${pa}}"

		# Concatenate both parts (existing and remainder)
		test "${p2}" = "/" || p2="${p2}/"
		pb=${pb#/}
		p2="${p2}${pb}"

		break
	    fi

	done

	# If no existing directory was found, error out
	test -e "${pa}" ||
	{ echo "$0: invalid path: ${p}" >&2; exit 1; }
    fi

    # Add this translated path to the translated pathlist
    test "${pathlist2}" = "" || pathlist2="${pathlist2}${separator2}"
    pathlist2="${pathlist2}${p2//${separator2}/\\${separator2}}"

done

# Write the translated pathlist to the standard output
printf "${pathlist2}"

## Local Variables:
## eval: (add-hook 'write-file-functions 'time-stamp)
## time-stamp-start: "VERSION='"
## time-stamp-format: "%:y-%02m-%02d %02H:%02M"
## time-stamp-time-zone: "UTC"
## time-stamp-end: "'; # UTC"
## End: