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173 lines
7.0 KiB
173 lines
7.0 KiB
# ==============================================================================
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# https://www.gnu.org/software/autoconf-archive/ax_compute_relative_paths.html
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# ==============================================================================
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#
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# SYNOPSIS
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#
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# AX_COMPUTE_RELATIVE_PATHS(PATH_LIST)
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#
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# DESCRIPTION
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#
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# PATH_LIST is a space-separated list of colon-separated triplets of the
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# form 'FROM:TO:RESULT'. This function iterates over these triplets and
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# set $RESULT to the relative path from $FROM to $TO. Note that $FROM and
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# $TO needs to be absolute filenames for this macro to success.
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#
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# For instance,
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#
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# first=/usr/local/bin
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# second=/usr/local/share
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# AX_COMPUTE_RELATIVE_PATHS([first:second:fs second:first:sf])
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# # $fs is set to ../share
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# # $sf is set to ../bin
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#
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# $FROM and $TO are both eval'ed recursively and normalized, this means
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# that you can call this macro with autoconf's dirnames like `prefix' or
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# `datadir'. For example:
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#
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# AX_COMPUTE_RELATIVE_PATHS([bindir:datadir:bin_to_data])
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#
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# AX_COMPUTE_RELATIVE_PATHS should also works with DOS filenames.
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#
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# You may want to use this macro in order to make your package
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# relocatable. Instead of hardcoding $datadir into your programs just
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# encode $bin_to_data and try to determine $bindir at run-time.
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#
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# This macro requires AX_NORMALIZE_PATH and AX_RECURSIVE_EVAL.
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#
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# LICENSE
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#
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# Copyright (c) 2008 Alexandre Duret-Lutz <adl@gnu.org>
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#
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# This program is free software; you can redistribute it and/or modify it
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# under the terms of the GNU General Public License as published by the
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# Free Software Foundation; either version 2 of the License, or (at your
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# option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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# Public License for more details.
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#
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# You should have received a copy of the GNU General Public License along
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# with this program. If not, see <https://www.gnu.org/licenses/>.
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#
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# As a special exception, the respective Autoconf Macro's copyright owner
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# gives unlimited permission to copy, distribute and modify the configure
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# scripts that are the output of Autoconf when processing the Macro. You
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# need not follow the terms of the GNU General Public License when using
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# or distributing such scripts, even though portions of the text of the
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# Macro appear in them. The GNU General Public License (GPL) does govern
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# all other use of the material that constitutes the Autoconf Macro.
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#
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# This special exception to the GPL applies to versions of the Autoconf
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# Macro released by the Autoconf Archive. When you make and distribute a
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# modified version of the Autoconf Macro, you may extend this special
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# exception to the GPL to apply to your modified version as well.
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#serial 12
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AU_ALIAS([ADL_COMPUTE_RELATIVE_PATHS], [AX_COMPUTE_RELATIVE_PATHS])
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AC_DEFUN([AX_COMPUTE_RELATIVE_PATHS],
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[for _lcl_i in $1; do
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_lcl_from=\[$]`echo "[$]_lcl_i" | sed 's,:.*$,,'`
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_lcl_to=\[$]`echo "[$]_lcl_i" | sed 's,^[[^:]]*:,,' | sed 's,:[[^:]]*$,,'`
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_lcl_result_var=`echo "[$]_lcl_i" | sed 's,^.*:,,'`
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AX_RECURSIVE_EVAL([[$]_lcl_from], [_lcl_from])
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AX_RECURSIVE_EVAL([[$]_lcl_to], [_lcl_to])
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_lcl_notation="$_lcl_from$_lcl_to"
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AX_NORMALIZE_PATH([_lcl_from],['/'])
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AX_NORMALIZE_PATH([_lcl_to],['/'])
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AX_COMPUTE_RELATIVE_PATH([_lcl_from], [_lcl_to], [_lcl_result_tmp])
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AX_NORMALIZE_PATH([_lcl_result_tmp],["[$]_lcl_notation"])
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eval $_lcl_result_var='[$]_lcl_result_tmp'
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done])
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## Note:
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## *****
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## The following helper macros are too fragile to be used out
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## of AX_COMPUTE_RELATIVE_PATHS (mainly because they assume that
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## paths are normalized), that's why I'm keeping them in the same file.
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## Still, some of them maybe worth to reuse.
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dnl AX_COMPUTE_RELATIVE_PATH(FROM, TO, RESULT)
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dnl ===========================================
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dnl Compute the relative path to go from $FROM to $TO and set the value
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dnl of $RESULT to that value. This function work on raw filenames
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dnl (for instead it will considerate /usr//local and /usr/local as
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dnl two distinct paths), you should really use AX_COMPUTE_RELATIVE_PATHS
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dnl instead to have the paths sanitized automatically.
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dnl
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dnl For instance:
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dnl first_dir=/somewhere/on/my/disk/bin
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dnl second_dir=/somewhere/on/another/disk/share
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dnl AX_COMPUTE_RELATIVE_PATH(first_dir, second_dir, first_to_second)
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dnl will set $first_to_second to '../../../another/disk/share'.
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AC_DEFUN([AX_COMPUTE_RELATIVE_PATH],
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[AX_COMPUTE_COMMON_PATH([$1], [$2], [_lcl_common_prefix])
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AX_COMPUTE_BACK_PATH([$1], [_lcl_common_prefix], [_lcl_first_rel])
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AX_COMPUTE_SUFFIX_PATH([$2], [_lcl_common_prefix], [_lcl_second_suffix])
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$3="[$]_lcl_first_rel[$]_lcl_second_suffix"])
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dnl AX_COMPUTE_COMMON_PATH(LEFT, RIGHT, RESULT)
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dnl ============================================
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dnl Compute the common path to $LEFT and $RIGHT and set the result to $RESULT.
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dnl
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dnl For instance:
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dnl first_path=/somewhere/on/my/disk/bin
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dnl second_path=/somewhere/on/another/disk/share
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dnl AX_COMPUTE_COMMON_PATH(first_path, second_path, common_path)
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dnl will set $common_path to '/somewhere/on'.
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AC_DEFUN([AX_COMPUTE_COMMON_PATH],
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[$3=''
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_lcl_second_prefix_match=''
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while test "[$]_lcl_second_prefix_match" != 0; do
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_lcl_first_prefix=`expr "x[$]$1" : "x\([$]$3/*[[^/]]*\)"`
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_lcl_second_prefix_match=`expr "x[$]$2" : "x[$]_lcl_first_prefix"`
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if test "[$]_lcl_second_prefix_match" != 0; then
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if test "[$]_lcl_first_prefix" != "[$]$3"; then
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$3="[$]_lcl_first_prefix"
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else
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_lcl_second_prefix_match=0
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fi
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fi
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done])
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dnl AX_COMPUTE_SUFFIX_PATH(PATH, SUBPATH, RESULT)
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dnl ==============================================
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dnl Subtract $SUBPATH from $PATH, and set the resulting suffix
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dnl (or the empty string if $SUBPATH is not a subpath of $PATH)
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dnl to $RESULT.
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dnl
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dnl For instance:
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dnl first_path=/somewhere/on/my/disk/bin
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dnl second_path=/somewhere/on
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dnl AX_COMPUTE_SUFFIX_PATH(first_path, second_path, common_path)
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dnl will set $common_path to '/my/disk/bin'.
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AC_DEFUN([AX_COMPUTE_SUFFIX_PATH],
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[$3=`expr "x[$]$1" : "x[$]$2/*\(.*\)"`])
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dnl AX_COMPUTE_BACK_PATH(PATH, SUBPATH, RESULT)
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dnl ============================================
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dnl Compute the relative path to go from $PATH to $SUBPATH, knowing that
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dnl $SUBPATH is a subpath of $PATH (any other words, only repeated '../'
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dnl should be needed to move from $PATH to $SUBPATH) and set the value
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dnl of $RESULT to that value. If $SUBPATH is not a subpath of PATH,
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dnl set $RESULT to the empty string.
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dnl
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dnl For instance:
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dnl first_path=/somewhere/on/my/disk/bin
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dnl second_path=/somewhere/on
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dnl AX_COMPUTE_BACK_PATH(first_path, second_path, back_path)
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dnl will set $back_path to '../../../'.
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AC_DEFUN([AX_COMPUTE_BACK_PATH],
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[AX_COMPUTE_SUFFIX_PATH([$1], [$2], [_lcl_first_suffix])
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$3=''
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_lcl_tmp='xxx'
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while test "[$]_lcl_tmp" != ''; do
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_lcl_tmp=`expr "x[$]_lcl_first_suffix" : "x[[^/]]*/*\(.*\)"`
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if test "[$]_lcl_first_suffix" != ''; then
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_lcl_first_suffix="[$]_lcl_tmp"
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$3="../[$]$3"
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fi
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done])
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