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##### http://autoconf-archive.cryp.to/adl_normalize_path.html
#
# SYNOPSIS
#
#   adl_NORMALIZE_PATH(VARNAME, [REFERENCE_STRING])
#
# DESCRIPTION
#
#   Perform some cleanups on the value of $VARNAME (interpreted as a
#   path):
#
#     - empty paths are changed to '.'
#     - trailing slashes are removed
#     - repeated slashes are squeezed except a leading doubled slash '//'
#       (which might indicate a networked disk on some OS).
#
#   REFERENCE_STRING is used to turn '/' into '\' and vice-versa: if
#   REFERENCE_STRING contains some backslashes, all slashes and
#   backslashes are turned into backslashes, otherwise they are all
#   turned into slashes.
#
#   This makes processing of DOS filenames quite easier, because you
#   can turn a filename to the Unix notation, make your processing, and
#   turn it back to original notation.
#
#     filename='A:\FOO\\BAR\'
#     old_filename="$filename"
#     # Switch to the unix notation
#     adl_NORMALIZE_PATH([filename], ["/"])
#     # now we have $filename = 'A:/FOO/BAR' and we can process it as if
#     # it was a Unix path.  For instance let's say that you want
#     # to append '/subpath':
#     filename="$filename/subpath"
#     # finally switch back to the original notation
#     adl_NORMALIZE_PATH([filename], ["$old_filename"])
#     # now $filename equals to 'A:\FOO\BAR\subpath'
#
#   One good reason to make all path processing with the unix
#   convention is that backslashes have a special meaning in many
#   cases. For instance
#
#     expr 'A:\FOO' : 'A:\Foo'
#
#   will return 0 because the second argument is a regex in which
#   backslashes have to be backslashed. In other words, to have the two
#   strings to match you should write this instead:
#
#     expr 'A:\Foo' : 'A:\\Foo'
#
#   Such behavior makes DOS filenames extremely unpleasant to work
#   with. So temporary turn your paths to the Unix notation, and revert
#   them to the original notation after the processing. See the macro
#   adl_COMPUTE_RELATIVE_PATHS for a concrete example of this.
#
#   REFERENCE_STRING defaults to $VARIABLE, this means that slashes
#   will be converted to backslashes if $VARIABLE already contains some
#   backslashes (see $thirddir below).
#
#     firstdir='/usr/local//share'
#     seconddir='C:\Program Files\\'
#     thirddir='C:\home/usr/'
#     adl_NORMALIZE_PATH([firstdir])
#     adl_NORMALIZE_PATH([seconddir])
#     adl_NORMALIZE_PATH([thirddir])
#     # $firstdir = '/usr/local/share'
#     # $seconddir = 'C:\Program Files'
#     # $thirddir = 'C:\home\usr'
#
# LAST MODIFICATION
#
#   2006-10-22
#
# COPYLEFT
#
#   Copyright (c) 2006 Alexandre Duret-Lutz <adl@gnu.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 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, write to the Free Software
#   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
#   02111-1307, USA.
#
#   As a special exception, the respective Autoconf Macro's copyright
#   owner gives unlimited permission to copy, distribute and modify the
#   configure scripts that are the output of Autoconf when processing
#   the Macro. You need not follow the terms of the GNU General Public
#   License when using or distributing such scripts, even though
#   portions of the text of the Macro appear in them. The GNU General
#   Public License (GPL) does govern all other use of the material that
#   constitutes the Autoconf Macro.
#
#   This special exception to the GPL applies to versions of the
#   Autoconf Macro released by the Autoconf Macro Archive. When you
#   make and distribute a modified version of the Autoconf Macro, you
#   may extend this special exception to the GPL to apply to your
#   modified version as well.

AC_DEFUN([adl_NORMALIZE_PATH],
[case ":[$]$1:" in
# change empty paths to '.'
  ::) $1='.' ;;
# strip trailing slashes
  :*[[\\/]]:) $1=`echo "[$]$1" | sed 's,[[\\/]]*[$],,'` ;;
  :*:) ;;
esac
# squeze repeated slashes
case ifelse($2,,"[$]$1",$2) in
# if the path contains any backslashes, turn slashes into backslashes
 *\\*) $1=`echo "[$]$1" | sed 's,\(.\)[[\\/]][[\\/]]*,\1\\\\,g'` ;;
# if the path contains slashes, also turn backslashes into slashes
 *) $1=`echo "[$]$1" | sed 's,\(.\)[[\\/]][[\\/]]*,\1/,g'` ;;
esac])







##### http://autoconf-archive.cryp.to/adl_compute_relative_paths.html
#
# SYNOPSIS
#
#   adl_COMPUTE_RELATIVE_PATHS(PATH_LIST)
#
# DESCRIPTION
#
#   PATH_LIST is a space-separated list of colon-separated triplets of
#   the form 'FROM:TO:RESULT'. This function iterates over these
#   triplets and set $RESULT to the relative path from $FROM to $TO.
#   Note that $FROM and $TO needs to be absolute filenames for this
#   macro to success.
#
#   For instance,
#
#      first=/usr/local/bin
#      second=/usr/local/share
#      adl_COMPUTE_RELATIVE_PATHS([first:second:fs second:first:sf])
#      # $fs is set to ../share
#      # $sf is set to ../bin
#
#   $FROM and $TO are both eval'ed recursively and normalized, this
#   means that you can call this macro with autoconf's dirnames like
#   `prefix' or `datadir'. For example:
#
#      adl_COMPUTE_RELATIVE_PATHS([bindir:datadir:bin_to_data])
#
#   adl_COMPUTE_RELATIVE_PATHS should also works with DOS filenames.
#
#   You may want to use this macro in order to make your package
#   relocatable. Instead of hardcoding $datadir into your programs just
#   encode $bin_to_data and try to determine $bindir at run-time.
#
#   This macro requires adl_NORMALIZE_PATH.
#
# LAST MODIFICATION
#
#   2006-10-22
#
# COPYLEFT
#
#   Copyright (c) 2006 Alexandre Duret-Lutz <adl@gnu.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 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, write to the Free Software
#   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
#   02111-1307, USA.
#
#   As a special exception, the respective Autoconf Macro's copyright
#   owner gives unlimited permission to copy, distribute and modify the
#   configure scripts that are the output of Autoconf when processing
#   the Macro. You need not follow the terms of the GNU General Public
#   License when using or distributing such scripts, even though
#   portions of the text of the Macro appear in them. The GNU General
#   Public License (GPL) does govern all other use of the material that
#   constitutes the Autoconf Macro.
#
#   This special exception to the GPL applies to versions of the
#   Autoconf Macro released by the Autoconf Macro Archive. When you
#   make and distribute a modified version of the Autoconf Macro, you
#   may extend this special exception to the GPL to apply to your
#   modified version as well.

AC_DEFUN([adl_COMPUTE_RELATIVE_PATHS],
[for _lcl_i in $1; do
  _lcl_from=\[$]`echo "[$]_lcl_i" | sed 's,:.*$,,'`
  _lcl_to=\[$]`echo "[$]_lcl_i" | sed 's,^[[^:]]*:,,' | sed 's,:[[^:]]*$,,'`
  _lcl_result_var=`echo "[$]_lcl_i" | sed 's,^.*:,,'`
  adl_RECURSIVE_EVAL([[$]_lcl_from], [_lcl_from])
  adl_RECURSIVE_EVAL([[$]_lcl_to], [_lcl_to])
  _lcl_notation="$_lcl_from$_lcl_to"
  adl_NORMALIZE_PATH([_lcl_from],['/'])
  adl_NORMALIZE_PATH([_lcl_to],['/'])
  adl_COMPUTE_RELATIVE_PATH([_lcl_from], [_lcl_to], [_lcl_result_tmp])
  adl_NORMALIZE_PATH([_lcl_result_tmp],["[$]_lcl_notation"])
  eval $_lcl_result_var='[$]_lcl_result_tmp'
done])

## Note:
## *****
## The following helper macros are too fragile to be used out
## of adl_COMPUTE_RELATIVE_PATHS (mainly because they assume that
## paths are normalized), that's why I'm keeping them in the same file.
## Still, some of them maybe worth to reuse.

dnl adl_COMPUTE_RELATIVE_PATH(FROM, TO, RESULT)
dnl ===========================================
dnl Compute the relative path to go from $FROM to $TO and set the value
dnl of $RESULT to that value.  This function work on raw filenames
dnl (for instead it will considerate /usr//local and /usr/local as
dnl two distinct paths), you should really use adl_COMPUTE_REALTIVE_PATHS
dnl instead to have the paths sanitized automatically.
dnl
dnl For instance:
dnl    first_dir=/somewhere/on/my/disk/bin
dnl    second_dir=/somewhere/on/another/disk/share
dnl    adl_COMPUTE_RELATIVE_PATH(first_dir, second_dir, first_to_second)
dnl will set $first_to_second to '../../../another/disk/share'.
AC_DEFUN([adl_COMPUTE_RELATIVE_PATH],
[adl_COMPUTE_COMMON_PATH([$1], [$2], [_lcl_common_prefix])
adl_COMPUTE_BACK_PATH([$1], [_lcl_common_prefix], [_lcl_first_rel])
adl_COMPUTE_SUFFIX_PATH([$2], [_lcl_common_prefix], [_lcl_second_suffix])
$3="[$]_lcl_first_rel[$]_lcl_second_suffix"])

dnl adl_COMPUTE_COMMON_PATH(LEFT, RIGHT, RESULT)
dnl ============================================
dnl Compute the common path to $LEFT and $RIGHT and set the result to $RESULT.
dnl
dnl For instance:
dnl    first_path=/somewhere/on/my/disk/bin
dnl    second_path=/somewhere/on/another/disk/share
dnl    adl_COMPUTE_COMMON_PATH(first_path, second_path, common_path)
dnl will set $common_path to '/somewhere/on'.
AC_DEFUN([adl_COMPUTE_COMMON_PATH],
[$3=''
_lcl_second_prefix_match=''
while test "[$]_lcl_second_prefix_match" != 0; do
  _lcl_first_prefix=`expr "x[$]$1" : "x\([$]$3/*[[^/]]*\)"`
  _lcl_second_prefix_match=`expr "x[$]$2" : "x[$]_lcl_first_prefix"`
  if test "[$]_lcl_second_prefix_match" != 0; then
    if test "[$]_lcl_first_prefix" != "[$]$3"; then
      $3="[$]_lcl_first_prefix"
    else
      _lcl_second_prefix_match=0
    fi
  fi
done])

dnl adl_COMPUTE_SUFFIX_PATH(PATH, SUBPATH, RESULT)
dnl ==============================================
dnl Substrack $SUBPATH from $PATH, and set the resulting suffix
dnl (or the empty string if $SUBPATH is not a subpath of $PATH)
dnl to $RESULT.
dnl
dnl For instace:
dnl    first_path=/somewhere/on/my/disk/bin
dnl    second_path=/somewhere/on
dnl    adl_COMPUTE_SUFFIX_PATH(first_path, second_path, common_path)
dnl will set $common_path to '/my/disk/bin'.
AC_DEFUN([adl_COMPUTE_SUFFIX_PATH],
[$3=`expr "x[$]$1" : "x[$]$2/*\(.*\)"`])

dnl adl_COMPUTE_BACK_PATH(PATH, SUBPATH, RESULT)
dnl ============================================
dnl Compute the relative path to go from $PATH to $SUBPATH, knowing that
dnl $SUBPATH is a subpath of $PATH (any other words, only repeated '../'
dnl should be needed to move from $PATH to $SUBPATH) and set the value
dnl of $RESULT to that value.  If $SUBPATH is not a subpath of PATH,
dnl set $RESULT to the empty string.
dnl
dnl For instance:
dnl    first_path=/somewhere/on/my/disk/bin
dnl    second_path=/somewhere/on
dnl    adl_COMPUTE_BACK_PATH(first_path, second_path, back_path)
dnl will set $back_path to '../../../'.
AC_DEFUN([adl_COMPUTE_BACK_PATH],
[adl_COMPUTE_SUFFIX_PATH([$1], [$2], [_lcl_first_suffix])
$3=''
_lcl_tmp='xxx'
while test "[$]_lcl_tmp" != ''; do
  _lcl_tmp=`expr "x[$]_lcl_first_suffix" : "x[[^/]]*/*\(.*\)"`
  if test "[$]_lcl_first_suffix" != ''; then
     _lcl_first_suffix="[$]_lcl_tmp"
     $3="../[$]$3"
  fi
done])


dnl adl_RECURSIVE_EVAL(VALUE, RESULT)
dnl =================================
dnl Interpolate the VALUE in loop until it doesn't change,
dnl and set the result to $RESULT.
dnl WARNING: It's easy to get an infinite loop with some unsane input.
AC_DEFUN([adl_RECURSIVE_EVAL],
[_lcl_receval="$1"
$2=`(test "x$prefix" = xNONE && prefix="$ac_default_prefix"
     test "x$exec_prefix" = xNONE && exec_prefix="${prefix}"
     _lcl_receval_old=''
     while test "[$]_lcl_receval_old" != "[$]_lcl_receval"; do
       _lcl_receval_old="[$]_lcl_receval"
       eval _lcl_receval="\"[$]_lcl_receval\""
     done
     echo "[$]_lcl_receval")`])