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https://github.com/gnustep/tools-make.git
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4aa67de2e7
fixed case of paths with no common path in common git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/tools/make/trunk@13848 72102866-910b-0410-8b05-ffd578937521
132 lines
No EOL
3.9 KiB
Bash
Executable file
132 lines
No EOL
3.9 KiB
Bash
Executable file
#!/bin/sh
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# relative_path.sh
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#
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# Copyright (C) 2002 Free Software Foundation, Inc.
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#
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# Author: Nicola Pero <n.pero@mi.flashnet.it>
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# Date: April 2001
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#
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# This file is part of the GNUstep Makefile Package.
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License
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# as published by the Free Software Foundation; either version 2
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# of the License, or (at your option) any later version.
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#
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# You should have received a copy of the GNU General Public
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# License along with this library; see the file COPYING.LIB.
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# If not, write to the Free Software Foundation,
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# 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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# This script gets two paths as argument - and outputs a relative path
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# which, when appended to the first one, gives the second one ... more
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# precisely, the path of minimum length with this property.
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#
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# <NB: the paths must be absolute, and can only contain empty path components
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# (ie, as in /usr/./GNUstep/) only in the final part of the paths. This is
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# a restriction in the implementation ... but it is enough for our needs.>
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#
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# for example,
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#
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# $GNUSTEP_MAKEFILES/relative_path.sh /usr/GNUstep/Local /usr/GNUstep/System
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#
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# returns ../System (and not ../../GNUstep/System which is not the minimum).
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#
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# This is needed by `ln -s' to properly create symlinks between
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# directories which are related ... but we don't know how. We only
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# need this for frameworks, which are particularly complex and
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# delicate. For example, to create the link
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#
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# /usr/GNUstep/System/Libraries/ix86/linux-gnu/gnu-gnu-gnu/libnicola.so
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# --> ../../../../Frameworks/nicola.framework/Versions/Current/ix86/linux-gnu/gnu-gnu-gnu/libnicola.so
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#
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# (and where the paths are actually computed by make variables which
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# might depend on variables in user makefiles outside our control, so
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# it's not obvious what the relationship is between the two paths, and
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# you only have the absolute paths) we do -
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#
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# cd /usr/GNUstep/System/Libraries/ix86/linux-gnu/gnu-gnu-gnu/libnicola.so
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# $(LN_S) `$(RELATIVE_PATH_SCRIPT) /usr/GNUstep/System/Frameworks/nicola.framework/Versions/Current/ix86/linux-gnu/gnu-gnu-gnu/libnicola.so /usr/GNUstep/System/Libraries/ix86/linux-gnu/gnu-gnu-gnu/`
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#
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# which creates the link. We need to use the minimum path because
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# that is the most relocatable possible path. I consider all this a
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# trick and a hack and recommend to use libraries and bundles instead
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# of frameworks, since libraries and bundles are much more portable
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# and stable, anyway here we are.
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#
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if [ "$#" != 2 ]; then
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exit 1
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fi
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a="$1";
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b="$2";
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if [ "$a" = "" ]; then
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exit 1
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fi
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if [ "$b" = "" ]; then
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exit 1
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fi
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#
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# Our first argument is a path like /xxx/yyy/zzz/ccc/ttt
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# Our second argument is a path like /xxx/yyy/kkk/nnn/ppp
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#
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# We first want to remove the common root -- we want to get into having
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# /zzz/ccc/tt and /kkk/nnn/ppp.
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# We first try to match as much as possible between the first and the second
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# So we loop on the fields in the second. The common root must not contain
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# empty path components (/./) for this to work.
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tmp_IFS="$IFS"
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IFS=/
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partial_b=""
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partial_match=""
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for component in $b; do
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if [ -n "$component" ]; then
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partial_b="$partial_b/$component"
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case "$a" in
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"$partial_b"*) partial_match="$partial_b";;
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*) break;;
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esac
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fi
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done
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IFS="$tmp_IFS"
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if [ "$partial_match" != "" ]; then
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# Now partial_match is the substring which matches (/xxx/yyy/) in the
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# example. Remove it from both a and b.
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a=`echo $a | sed -e "s#$partial_match##"`
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b=`echo $b | sed -e "s#$partial_match##"`
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fi
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# Ok - now ready to build the result
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result=""
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# First add as many ../ as there are components in a
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tmp_IFS="$IFS"
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IFS=/
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for component in $a; do
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if [ -n "$component" -a "$component" != "." ]; then
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if [ -z "$result" ]; then
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result=".."
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else
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result="$result/.."
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fi
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fi
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done
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IFS="$tmp_IFS"
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# Then, append b
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if [ -n "$result" ]; then
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result="$result$b"
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else
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result="$b"
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fi
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echo "$result" |