174 lines
7.0 KiB
Plaintext
174 lines
7.0 KiB
Plaintext
# ==============================================================================
|
|
# https://www.gnu.org/software/autoconf-archive/ax_compute_relative_paths.html
|
|
# ==============================================================================
|
|
#
|
|
# SYNOPSIS
|
|
#
|
|
# AX_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
|
|
# AX_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:
|
|
#
|
|
# AX_COMPUTE_RELATIVE_PATHS([bindir:datadir:bin_to_data])
|
|
#
|
|
# AX_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 AX_NORMALIZE_PATH and AX_RECURSIVE_EVAL.
|
|
#
|
|
# LICENSE
|
|
#
|
|
# Copyright (c) 2008 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, see <https://www.gnu.org/licenses/>.
|
|
#
|
|
# 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 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.
|
|
|
|
#serial 12
|
|
|
|
AU_ALIAS([ADL_COMPUTE_RELATIVE_PATHS], [AX_COMPUTE_RELATIVE_PATHS])
|
|
AC_DEFUN([AX_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,^.*:,,'`
|
|
AX_RECURSIVE_EVAL([[$]_lcl_from], [_lcl_from])
|
|
AX_RECURSIVE_EVAL([[$]_lcl_to], [_lcl_to])
|
|
_lcl_notation="$_lcl_from$_lcl_to"
|
|
AX_NORMALIZE_PATH([_lcl_from],['/'])
|
|
AX_NORMALIZE_PATH([_lcl_to],['/'])
|
|
AX_COMPUTE_RELATIVE_PATH([_lcl_from], [_lcl_to], [_lcl_result_tmp])
|
|
AX_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 AX_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 AX_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 AX_COMPUTE_RELATIVE_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 AX_COMPUTE_RELATIVE_PATH(first_dir, second_dir, first_to_second)
|
|
dnl will set $first_to_second to '../../../another/disk/share'.
|
|
AC_DEFUN([AX_COMPUTE_RELATIVE_PATH],
|
|
[AX_COMPUTE_COMMON_PATH([$1], [$2], [_lcl_common_prefix])
|
|
AX_COMPUTE_BACK_PATH([$1], [_lcl_common_prefix], [_lcl_first_rel])
|
|
AX_COMPUTE_SUFFIX_PATH([$2], [_lcl_common_prefix], [_lcl_second_suffix])
|
|
$3="[$]_lcl_first_rel[$]_lcl_second_suffix"])
|
|
|
|
dnl AX_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 AX_COMPUTE_COMMON_PATH(first_path, second_path, common_path)
|
|
dnl will set $common_path to '/somewhere/on'.
|
|
AC_DEFUN([AX_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 AX_COMPUTE_SUFFIX_PATH(PATH, SUBPATH, RESULT)
|
|
dnl ==============================================
|
|
dnl Subtract $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 instance:
|
|
dnl first_path=/somewhere/on/my/disk/bin
|
|
dnl second_path=/somewhere/on
|
|
dnl AX_COMPUTE_SUFFIX_PATH(first_path, second_path, common_path)
|
|
dnl will set $common_path to '/my/disk/bin'.
|
|
AC_DEFUN([AX_COMPUTE_SUFFIX_PATH],
|
|
[$3=`expr "x[$]$1" : "x[$]$2/*\(.*\)"`])
|
|
|
|
dnl AX_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 AX_COMPUTE_BACK_PATH(first_path, second_path, back_path)
|
|
dnl will set $back_path to '../../../'.
|
|
AC_DEFUN([AX_COMPUTE_BACK_PATH],
|
|
[AX_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])
|