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