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#!/usr/bin/perl
# Uses symlinks to merge the files contained in a set of vcs
# checkouts to into a single directory. Keeps track of when files are
# removed from the merged directories and removes the symlinks.
#
# Only merges files that match the specified pattern.
#
# Note that the directories given to merge should be paths that will work
# for symlink targets from the destination directory (so either full paths,
# or they should be right inside the destination directory).
#
# Note that other files in the destination directory will be left as-is.
#
# Copyright 2006 by Joey Hess, licensed under the GPL.
if (! @ARGV) {
die "usage: dircombine include-pattern dest dir1 [dir2 ...]\n";
}
my $pattern=shift;
my $dest=shift;
foreach my $dir (@ARGV) {
my %known;
# Link in each thing from the dir.
opendir(DIR, $dir) || die "opendir: $!";
while ($_=readdir(DIR)) {
next if $_ eq '.' || $_ eq '..' || $_ eq 'known' || $_ eq '.svn' || $_ eq '.git' || $_ eq '.gitignore' || $_ eq '_darcs';
next unless /$pattern/;
$known{$_}=1;
if (! -l "$dest/$_" && -e "$dest/$_") {
print STDERR "$_ in $dir is also in $dest\n";
}
elsif (! -l "$dest/$_") {
system("ln", "-svf", "$dir/$_", $dest);
}
}
closedir(DIR);
# Remove anything that was previously linked in but is not in the
# dir anymore.
if (-e "$dir/known") {
open(KNOWN, "$dir/known") || die "open $dir/known: $!";
while (<KNOWN>) {
chomp;
if (! $known{$_}) {
system("rm", "-vf", "$dest/$_");
}
}
close KNOWN;
}
# Save state for next time.
open(KNOWN, ">$dir/known") || die "write $dir/known: $!";
foreach my $file (sort keys %known) {
print KNOWN "$file\n";
}
close KNOWN;
}
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