mirror of https://github.com/encounter/SDL.git
116 lines
4.7 KiB
Plaintext
116 lines
4.7 KiB
Plaintext
# ===========================================================================
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# https://www.gnu.org/software/autoconf-archive/ax_normalize_path.html
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# ===========================================================================
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#
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# SYNOPSIS
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#
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# AX_NORMALIZE_PATH(VARNAME, [REFERENCE_STRING])
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#
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# DESCRIPTION
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#
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# Perform some cleanups on the value of $VARNAME (interpreted as a path):
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#
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# - empty paths are changed to '.'
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# - trailing slashes are removed
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# - repeated slashes are squeezed except a leading doubled slash '//'
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# (which might indicate a networked disk on some OS).
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#
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# REFERENCE_STRING is used to turn '/' into '\' and vice-versa: if
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# REFERENCE_STRING contains some backslashes, all slashes and backslashes
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# are turned into backslashes, otherwise they are all turned into slashes.
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#
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# This makes processing of DOS filenames quite easier, because you can
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# turn a filename to the Unix notation, make your processing, and turn it
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# back to original notation.
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#
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# filename='A:\FOO\\BAR\'
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# old_filename="$filename"
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# # Switch to the unix notation
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# AX_NORMALIZE_PATH([filename], ["/"])
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# # now we have $filename = 'A:/FOO/BAR' and we can process it as if
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# # it was a Unix path. For instance let's say that you want
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# # to append '/subpath':
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# filename="$filename/subpath"
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# # finally switch back to the original notation
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# AX_NORMALIZE_PATH([filename], ["$old_filename"])
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# # now $filename equals to 'A:\FOO\BAR\subpath'
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#
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# One good reason to make all path processing with the unix convention is
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# that backslashes have a special meaning in many cases. For instance
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#
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# expr 'A:\FOO' : 'A:\Foo'
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#
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# will return 0 because the second argument is a regex in which
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# backslashes have to be backslashed. In other words, to have the two
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# strings to match you should write this instead:
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#
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# expr 'A:\Foo' : 'A:\\Foo'
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#
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# Such behavior makes DOS filenames extremely unpleasant to work with. So
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# temporary turn your paths to the Unix notation, and revert them to the
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# original notation after the processing. See the macro
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# AX_COMPUTE_RELATIVE_PATHS for a concrete example of this.
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#
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# REFERENCE_STRING defaults to $VARIABLE, this means that slashes will be
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# converted to backslashes if $VARIABLE already contains some backslashes
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# (see $thirddir below).
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#
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# firstdir='/usr/local//share'
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# seconddir='C:\Program Files\\'
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# thirddir='C:\home/usr/'
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# AX_NORMALIZE_PATH([firstdir])
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# AX_NORMALIZE_PATH([seconddir])
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# AX_NORMALIZE_PATH([thirddir])
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# # $firstdir = '/usr/local/share'
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# # $seconddir = 'C:\Program Files'
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# # $thirddir = 'C:\home\usr'
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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 8
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AU_ALIAS([ADL_NORMALIZE_PATH], [AX_NORMALIZE_PATH])
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AC_DEFUN([AX_NORMALIZE_PATH],
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[case ":[$]$1:" in
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# change empty paths to '.'
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::) $1='.' ;;
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# strip trailing slashes
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:*[[\\/]]:) $1=`echo "[$]$1" | sed 's,[[\\/]]*[$],,'` ;;
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:*:) ;;
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esac
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# squeeze repeated slashes
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case ifelse($2,,"[$]$1",$2) in
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# if the path contains any backslashes, turn slashes into backslashes
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*\\*) $1=`echo "[$]$1" | sed 's,\(.\)[[\\/]][[\\/]]*,\1\\\\,g'` ;;
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# if the path contains slashes, also turn backslashes into slashes
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*) $1=`echo "[$]$1" | sed 's,\(.\)[[\\/]][[\\/]]*,\1/,g'` ;;
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esac])
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