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ax_normalize_path.m4
# =========================================================================== # https://www.gnu.org/software/autoconf-archive/ax_normalize_path.html # =========================================================================== # # SYNOPSIS # # AX_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 # AX_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 # AX_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 # AX_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/' # AX_NORMALIZE_PATH([firstdir]) # AX_NORMALIZE_PATH([seconddir]) # AX_NORMALIZE_PATH([thirddir]) # # $firstdir = '/usr/local/share' # # $seconddir = 'C:\Program Files' # # $thirddir = 'C:\home\usr' # # LICENSE # # Copyright (c) 2008 Alexandre Duret-Lutz <adl@gnu.org> # # This program is free software; you can redistribute it and/or modify it # under the terms of the GNU General Public License as published by the # Free Software Foundation; either version 2 of the License, or (at your # option) any later version. # # This program is distributed in the hope that it will be useful, but # WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General # Public License for more details. # # You should have received a copy of the GNU General Public License along # with this program. If not, see <https://www.gnu.org/licenses/>. # # As a special exception, the respective Autoconf Macro's copyright owner # gives unlimited permission to copy, distribute and modify the configure # scripts that are the output of Autoconf when processing the Macro. You # need not follow the terms of the GNU General Public License when using # or distributing such scripts, even though portions of the text of the # Macro appear in them. The GNU General Public License (GPL) does govern # all other use of the material that constitutes the Autoconf Macro. # # This special exception to the GPL applies to versions of the Autoconf # Macro released by the Autoconf Archive. When you make and distribute a # modified version of the Autoconf Macro, you may extend this special # exception to the GPL to apply to your modified version as well. #serial 6 AU_ALIAS([ADL_NORMALIZE_PATH], [AX_NORMALIZE_PATH]) AC_DEFUN([AX_NORMALIZE_PATH], [case ":[$]$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])