1 #!/usr/bin/env perl
2 #
3 # Copyright (c) 2022 Omar Polo <op@omarpolo.com>
4 #
5 # Permission to use, copy, modify, and distribute this software for any
6 # purpose with or without fee is hereby granted, provided that the above
7 # copyright notice and this permission notice appear in all copies.
8 #
9 # THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 # WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 # MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 # ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 # WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 # ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 # OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 #
17 # subst -- filter that replaces key=values pairs
18 #
19 # usage: subst key1=val1 [... keyn=valn] [files...]
20 #
21 # Use `--' before the first file if it may contain an = in its name.
22 # If no files are given, read and substitute from standard input.
23 
24 use v5.10;
25 use strict;
26 use warnings;
27 
28 my @args = ();
29 
30 while (1) {
31 	$_ = shift;
32 	last if !$_;
33 
34 	if ($_ eq '--') {
35 		last;
36 	} elsif ($_ !~ m/=/) {
37 		unshift @ARGV, $_;
38 		last;
39 	}
40 
41 	my ($match, $repl) = m/^([^\s]*)=(.*)$/;
42 	push @args, "-e", "s,$match,$repl,g";
43 }
44 
45 # OK, shelling out to sed is a bit lame...
46 exec "sed", @args, @ARGV;