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#!/usr/bin/perl
# build -- process and act on embedded build instructions
use strict;
use warnings;
# parse arguments
my ($debug, $fork) = (0, 0);
my $usage = "usage: $0 [-dddf] file [...]\n";
while (@ARGV and ($_ = $ARGV[0]) =~ /^-/) {
shift @ARGV;
last if $_ eq '--';
$debug++ for /(d)/g;
$fork++ if /f/;
die $usage if /[^-df]/;
}
die $usage if not @ARGV;
# find build line(s) in each file
my $i;
for my $file (@ARGV) {
my ($cmd, $target, @deps);
open my $f, '<', $file or die "could not open $file: $!\n";
$i = 1;
while (<$f>) {
if (not $cmd and m{
^ .*
(?: (?:build|generate) \s+ (?:it \s+)? with
| (?:built|generated) \s+ with
| the \s+ command
| run(?:ning)?
| issu(?:e|ing)
) \s+
(.+?) \s* (?: > \s* (.+?))? \.? \s*
(?:\*/)? \s* $
}x) {
warn "$file build line: $_" if $debug > 2;
$cmd = $1;
$target = $2;
}
elsif (not @deps and m{
^ .*
(?: depends \s+ on
| dependent \s+ on
) \s+
(?: the \s+ files? \s+ )?
(.+?) \.? \s*
(?:\*/)? \s* $
}x) {
warn "$file dependency line: $_" if $debug > 2;
push @deps, $_ for split /,?\s+/, $1;
if ($deps[-2] eq 'and') {
$deps[-2] = $deps[-1];
pop @deps;
}
}
last if ++$i > 20;
}
warn "$file dependencies: @deps\n" if $debug > 1;
build($file, $cmd, $target, @deps) if $cmd;
warn "$file: no build line found\n" if not $cmd;
}
# build target according to build line
sub build {
my ($source, $cmd, $target, @deps) = @_;
my $m = (stat$target)[9];
if (! -e $target) {
warn "$source: building because $target does not exist\n"
if $debug;
goto update;
}
for ($source, @deps) {
if (! -e $_) {
warn "$source: non-existent dependency '$_'\n";
next;
}
if ($m < (stat$_)[9]) {
warn "$source: building because $_ is modified\n"
if $debug;
goto update;
}
}
warn "$source: $target already up-to-date\n";
return;
update:
warn "$source: $cmd > $target\n";
if ($fork) {
exec('/bin/sh', '-c', "$cmd > $target") if fork() == 0;
} else {
system("$cmd > $target");
}
return;
}
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