1#!/usr/bin/env perl
2# a script for use by autoconf to make the Makefiles
3# from the Makefile.in's
4#
5# the original autoconf mechanism first splits all substitutions into groups
6# of ca. 90, and than invokes sed for _every_ Makefile.in and every group
7# (so around 2-3 times per Makefile.in). So this takes forever, as sed
8# has to recompile the regexps every time.
9#
10# this script does better. It changes all Makefile.ins in one process.
11# in kdelibs the time for building Makefile went down from 2:59 min to 13 sec!
12#
13# written by Michael Matz <matz@kde.org>
14# adapted by Dirk Mueller <mueller@kde.org>
15
16#   This file is free software; you can redistribute it and/or
17#   modify it under the terms of the GNU Library General Public
18#   License as published by the Free Software Foundation; either
19#   version 2 of the License, or (at your option) any later version.
20
21#   This library is distributed in the hope that it will be useful,
22#   but WITHOUT ANY WARRANTY; without even the implied warranty of
23#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
24#   Library General Public License for more details.
25
26#   You should have received a copy of the GNU Library General Public License
27#   along with this library; see the file COPYING.LIB.  If not, write to
28#   the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
29#   Boston, MA 02110-1301, USA.
30
31use strict;
32
33use File::Path;
34
35my $ac_subs=$ARGV[0];
36my $ac_sacfiles = $ARGV[1];
37my $ac_given_srcdir=$ARGV[2];
38my $ac_given_INSTALL=$ARGV[3];
39
40my @comp_match;
41my @comp_subs;
42
43#print "ac_subs=$ac_subs\n";
44#print "ac_sacfiles=$ac_sacfiles\n";
45#print "ac_given_srcdir=$ac_given_srcdir\n";
46#print "ac_given_INSTALL=$ac_given_INSTALL\n";
47
48my $configure_input;
49my ($srcdir, $top_srcdir);
50my $INSTALL;
51my $bad_perl = ($] < 5.005);
52my $created_file_count = 0;
53
54open(CF, "< $ac_subs") || die "can't open $ac_subs: $!";
55my @subs = <CF>;
56my $pat;
57close(CF);
58chomp @subs;
59@comp_match=();
60@comp_subs=();
61
62if ($bad_perl) {
63    print "Using perl older than version 5.005\n";
64    foreach $pat (@subs) {
65	if (  ($pat =~ m/s%([^%]*)%([^%]*)%g/ )
66	   || ($pat =~ m/s%([^%]*)%([^%]*)%;t/ )
67           || ($pat =~ m/s,([^,]*),(.*),;t/)
68	   || ($pat =~ m%s/([^/]*)/([^/]*)/g% )
69	   || ($pat =~ m%s/([^/]*)/([^/]*)/;t% )
70	   ) {
71            # form : s%bla%blubb%g
72            # or     s%bla%blubb%;t t   (autoconf > 2.13 and < 2.52 ?)
73            # or     s,bla,blubb,;t t   (autoconf 2.52)
74            my $srch = $1;
75            my $repl = $2;
76            $repl =~ s/\\(.)/$1/g;
77	    push @comp_subs, make_closure($srch, $repl);
78
79	} elsif ( ($pat =~ /%([^%]*)%d/ )
80	   || ($pat =~ m%/([^/]*)/d% )
81	   ) {
82	    push @comp_subs, make_closure($1, "");
83	} else {
84	    die "Uhh. Malformed pattern in $ac_subs ($pat)"
85		unless ( $pat =~ /^\s*$/ );   # ignore white lines
86	}
87    }
88} else {
89    foreach $pat (@subs) {
90       if ( ($pat =~ /s%([^%]*)%([^%]*)%g/ ) ||
91            ($pat =~ /s%([^%]*)%([^%]*)%;t/ ) ||
92            ($pat =~ /s,([^,]*),(.*),;t/) ) {
93         # form : s%bla%blubb%g
94         # or     s%bla%blubb%;t t   (autoconf > 2.13 and < 2.52 ?)
95         # or     s,bla,blubb,;t t   (autoconf 2.52)
96         my $srch = $1;
97         my $repl = $2;
98         push @comp_match, eval "qr/\Q$srch\E/";  # compile match pattern
99         $repl =~ s/\\(.)/$1/g;
100         push @comp_subs, $repl;
101      } elsif ( ($pat =~ /%([^%]*)%d/ )
102                || ($pat =~ m%/([^/]*)/d% )
103              ) {
104        push @comp_match, eval "qr/\Q$1\E/";
105        push @comp_subs, "";
106      } else {
107          die "Uhh. Malformed pattern in $ac_subs ($pat)"
108          unless ( $pat =~ /^\s*$/ );   # ignore white lines
109      }
110    }
111}
112undef @subs;
113
114# read the list of files to be patched, form:
115# ./Makefile arts/Makefile arts/examples/Makefile arts/flow/Makefile
116
117open(CF, "< $ac_sacfiles") || die "can't open $ac_sacfiles: $!";
118my @ac_files = <CF>;
119close(CF);
120chomp @ac_files;
121
122
123my $ac_file;
124foreach $ac_file (@ac_files) {
125    next if $ac_file =~ /\.\./;
126    next if $ac_file =~ /^\s*$/;
127    my $ac_file_in;
128    my ($ac_dir, $ac_dots, $ac_dir_suffix);
129
130    if ($ac_file =~ /.*:.*/ ) {
131	($ac_file_in = $ac_file) =~ s%[^:]*:%%;
132	$ac_file =~ s%:.*%%;
133    } else {
134	$ac_file_in = $ac_file.".in";
135    }
136
137# Adjust a relative srcdir, top_srcdir, and INSTALL for subdirectories.
138
139# Remove last slash and all that follows it.  Not all systems have dirname.
140    ($ac_dir = $ac_file) =~ s%/[^/][^/]*$%%;
141    if ( ($ac_dir ne $ac_file) && ($ac_dir ne ".")) {
142# The file is in a subdirectory.
143	if (! -d "$ac_dir") { mkpath "$ac_dir", 0, 0777; }
144	($ac_dir_suffix = $ac_dir) =~ s%^./%%;
145	$ac_dir_suffix="/".$ac_dir_suffix;
146# A "../" for each directory in $ac_dir_suffix.
147	($ac_dots = $ac_dir_suffix) =~ s%/[^/]*%../%g;
148    } else {
149	$ac_dir_suffix="";
150	$ac_dots="";
151    }
152
153    if ($ac_given_srcdir eq ".") {
154	$srcdir=".";
155	if ($ac_dots) {
156	    ( $top_srcdir = $ac_dots) =~ s%/$%%;
157	} else { $top_srcdir="."; }
158    } elsif ($ac_given_srcdir =~ m%^/%) {
159	$srcdir=$ac_given_srcdir.$ac_dir_suffix;
160	$top_srcdir = $ac_given_srcdir;
161    } else {
162	$srcdir = $ac_dots.$ac_given_srcdir.$ac_dir_suffix;
163	$top_srcdir = $ac_dots.$ac_given_srcdir;
164    }
165
166    if ($ac_given_INSTALL) {
167	if ($ac_given_INSTALL =~ m%^/% ) {
168	    $INSTALL = $ac_given_INSTALL;
169	} else {
170	    $INSTALL = $ac_dots.$ac_given_INSTALL;
171	}
172    }
173
174    print "fast creating $ac_file\n";
175    unlink $ac_file;
176    my $ac_comsub="";
177    my $fname=$ac_file_in;
178    $fname =~ s%.*/%%;
179    $configure_input="$ac_file.  Generated from $fname by config.pl.";
180
181    my $ac_file_inputs;
182    ($ac_file_inputs = $ac_file_in) =~ s%^%$ac_given_srcdir/%;
183    $ac_file_inputs =~ s%:% $ac_given_srcdir/%g;
184
185    patch_file($ac_file, $ac_file_inputs);
186    ++$created_file_count;
187}
188
189print "config.pl: fast created $created_file_count file(s).\n";
190
191sub patch_file {
192    my ($outf, $infiles) = @_;
193    my $filedata;
194    my @infiles=split(' ', $infiles);
195    my $i=0;
196    my $name;
197
198    foreach $name (@infiles) {
199	if (open(CF, "< $name")) {
200	    while (<CF>) {
201		$filedata .= $_;
202	    }
203	    close(CF);
204	} else {
205	    print STDERR "can't open $name: $!"."\n";
206	}
207    }
208
209    $filedata =~ s%\@configure_input\@%$configure_input%g;
210    $filedata =~ s%\@srcdir\@%$srcdir%g;
211    $filedata =~ s%\@top_srcdir\@%$top_srcdir%g;
212    $filedata =~ s%\@INSTALL\@%$INSTALL%g;
213
214    if ($bad_perl) {
215	while ($i <= $#comp_subs) {
216	    my $ref = $comp_subs[$i];
217	    &$ref(\$filedata);
218	    $i++;
219	}
220    } else {
221	while ($i <= $#comp_match) {
222	    $filedata =~ s/$comp_match[$i]/$comp_subs[$i]/g;
223	    $i++;
224	}
225    }
226    open(CF, "> $outf") || die "can't create $outf: $!";
227    print CF $filedata;
228    close(CF);
229}
230
231sub make_closure {
232    my ($pat, $sub) = @_;
233    my $ret = eval "return sub { my \$ref=shift; \$\$ref =~ s%\Q$pat\E%\Q$sub\E%g; }";
234    if ($@) {
235        print "can't create CODE: $@\n";
236    }
237    return $ret;
238}
239