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| 1 | +# =========================================================================== |
| 2 | +# http://www.gnu.org/software/autoconf-archive/ax_normalize_path.html |
| 3 | +# =========================================================================== |
| 4 | +# |
| 5 | +# SYNOPSIS |
| 6 | +# |
| 7 | +# AX_NORMALIZE_PATH(VARNAME, [REFERENCE_STRING]) |
| 8 | +# |
| 9 | +# DESCRIPTION |
| 10 | +# |
| 11 | +# Perform some cleanups on the value of $VARNAME (interpreted as a path): |
| 12 | +# |
| 13 | +# - empty paths are changed to '.' |
| 14 | +# - trailing slashes are removed |
| 15 | +# - repeated slashes are squeezed except a leading doubled slash '//' |
| 16 | +# (which might indicate a networked disk on some OS). |
| 17 | +# |
| 18 | +# REFERENCE_STRING is used to turn '/' into '\' and vice-versa: if |
| 19 | +# REFERENCE_STRING contains some backslashes, all slashes and backslashes |
| 20 | +# are turned into backslashes, otherwise they are all turned into slashes. |
| 21 | +# |
| 22 | +# This makes processing of DOS filenames quite easier, because you can |
| 23 | +# turn a filename to the Unix notation, make your processing, and turn it |
| 24 | +# back to original notation. |
| 25 | +# |
| 26 | +# filename='A:\FOO\\BAR\' |
| 27 | +# old_filename="$filename" |
| 28 | +# # Switch to the unix notation |
| 29 | +# AX_NORMALIZE_PATH([filename], ["/"]) |
| 30 | +# # now we have $filename = 'A:/FOO/BAR' and we can process it as if |
| 31 | +# # it was a Unix path. For instance let's say that you want |
| 32 | +# # to append '/subpath': |
| 33 | +# filename="$filename/subpath" |
| 34 | +# # finally switch back to the original notation |
| 35 | +# AX_NORMALIZE_PATH([filename], ["$old_filename"]) |
| 36 | +# # now $filename equals to 'A:\FOO\BAR\subpath' |
| 37 | +# |
| 38 | +# One good reason to make all path processing with the unix convention is |
| 39 | +# that backslashes have a special meaning in many cases. For instance |
| 40 | +# |
| 41 | +# expr 'A:\FOO' : 'A:\Foo' |
| 42 | +# |
| 43 | +# will return 0 because the second argument is a regex in which |
| 44 | +# backslashes have to be backslashed. In other words, to have the two |
| 45 | +# strings to match you should write this instead: |
| 46 | +# |
| 47 | +# expr 'A:\Foo' : 'A:\\Foo' |
| 48 | +# |
| 49 | +# Such behavior makes DOS filenames extremely unpleasant to work with. So |
| 50 | +# temporary turn your paths to the Unix notation, and revert them to the |
| 51 | +# original notation after the processing. See the macro |
| 52 | +# AX_COMPUTE_RELATIVE_PATHS for a concrete example of this. |
| 53 | +# |
| 54 | +# REFERENCE_STRING defaults to $VARIABLE, this means that slashes will be |
| 55 | +# converted to backslashes if $VARIABLE already contains some backslashes |
| 56 | +# (see $thirddir below). |
| 57 | +# |
| 58 | +# firstdir='/usr/local//share' |
| 59 | +# seconddir='C:\Program Files\\' |
| 60 | +# thirddir='C:\home/usr/' |
| 61 | +# AX_NORMALIZE_PATH([firstdir]) |
| 62 | +# AX_NORMALIZE_PATH([seconddir]) |
| 63 | +# AX_NORMALIZE_PATH([thirddir]) |
| 64 | +# # $firstdir = '/usr/local/share' |
| 65 | +# # $seconddir = 'C:\Program Files' |
| 66 | +# # $thirddir = 'C:\home\usr' |
| 67 | +# |
| 68 | +# LICENSE |
| 69 | +# |
| 70 | +# Copyright (c) 2008 Alexandre Duret-Lutz <adl@gnu.org> |
| 71 | +# |
| 72 | +# This program is free software; you can redistribute it and/or modify it |
| 73 | +# under the terms of the GNU General Public License as published by the |
| 74 | +# Free Software Foundation; either version 2 of the License, or (at your |
| 75 | +# option) any later version. |
| 76 | +# |
| 77 | +# This program is distributed in the hope that it will be useful, but |
| 78 | +# WITHOUT ANY WARRANTY; without even the implied warranty of |
| 79 | +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General |
| 80 | +# Public License for more details. |
| 81 | +# |
| 82 | +# You should have received a copy of the GNU General Public License along |
| 83 | +# with this program. If not, see <http://www.gnu.org/licenses/>. |
| 84 | +# |
| 85 | +# As a special exception, the respective Autoconf Macro's copyright owner |
| 86 | +# gives unlimited permission to copy, distribute and modify the configure |
| 87 | +# scripts that are the output of Autoconf when processing the Macro. You |
| 88 | +# need not follow the terms of the GNU General Public License when using |
| 89 | +# or distributing such scripts, even though portions of the text of the |
| 90 | +# Macro appear in them. The GNU General Public License (GPL) does govern |
| 91 | +# all other use of the material that constitutes the Autoconf Macro. |
| 92 | +# |
| 93 | +# This special exception to the GPL applies to versions of the Autoconf |
| 94 | +# Macro released by the Autoconf Archive. When you make and distribute a |
| 95 | +# modified version of the Autoconf Macro, you may extend this special |
| 96 | +# exception to the GPL to apply to your modified version as well. |
| 97 | + |
| 98 | +#serial 5 |
| 99 | + |
| 100 | +AU_ALIAS([ADL_NORMALIZE_PATH], [AX_NORMALIZE_PATH]) |
| 101 | +AC_DEFUN([AX_NORMALIZE_PATH], |
| 102 | +[case ":[$]$1:" in |
| 103 | +# change empty paths to '.' |
| 104 | + ::) $1='.' ;; |
| 105 | +# strip trailing slashes |
| 106 | + :*[[\\/]]:) $1=`echo "[$]$1" | sed 's,[[\\/]]*[$],,'` ;; |
| 107 | + :*:) ;; |
| 108 | +esac |
| 109 | +# squeze repeated slashes |
| 110 | +case ifelse($2,,"[$]$1",$2) in |
| 111 | +# if the path contains any backslashes, turn slashes into backslashes |
| 112 | + *\\*) $1=`echo "[$]$1" | sed 's,\(.\)[[\\/]][[\\/]]*,\1\\\\,g'` ;; |
| 113 | +# if the path contains slashes, also turn backslashes into slashes |
| 114 | + *) $1=`echo "[$]$1" | sed 's,\(.\)[[\\/]][[\\/]]*,\1/,g'` ;; |
| 115 | +esac]) |
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