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#!/usr/bin/env perl
use strict;
use warnings;
use feature 'say';
BEGIN {
use File::Basename qw(dirname);
use File::Spec;
my $d = dirname(File::Spec->rel2abs($0));
require "$d/../setenv.pl";
}
use CSS::Sass;
use File::ChangeNotify;
use File::Find::Rule;
use File::Slurp;
use Getopt::Long;
use MIME::Base64;
use MIME::Types;
use Path::Tiny;
use Pod::Usage;
# Store ARGV in case we need to restart later.
my @ARGVorig = @ARGV;
GetOptions(
'verbose' => \my $verbose,
'watch' => \my $watch,
'help|?' => \my $help,
) or pod2usage(2);
pod2usage(1) if $help;
my $mime_types = MIME::Types->new;
my $sass = CSS::Sass->new(
output_style => SASS_STYLE_COMPRESSED,
dont_die => 1,
sass_functions => {
'inline-image($url)' => sub {
my ($url) = @_;
die '$url should be a string' unless $url->isa("CSS::Sass::Value::String");
# URL is given with reference to the file, which we don't have here. Assume.
my $data = encode_base64(path("web/cobrands/fixmystreet/$url")->slurp_raw, "");
my $type = $mime_types->mimeTypeOf($url);
return "url('data:$type;base64,$data')";
}
},
);
# Get directories from the command line, defaulting to 'web' if none.
# We need absolute paths so that the include files lookup works.
my @dirs = map { m{/} ? $_ : "web/cobrands/$_" } @ARGV;
@dirs = 'web' unless @dirs;
@dirs = map { path($_)->absolute->stringify } @dirs;
# Initial compilation, to also discover all the included files.
my %includes;
my %include_to_main;
foreach my $file (File::Find::Rule->file->name(qr/^[^_].*\.scss$/)->in(@dirs)) {
my @includes = compile($file, $verbose);
$includes{$file} = \@includes;
map { push @{$include_to_main{$_}}, $file } @includes ? @includes : $file;
}
# If we're not watching, we're done!
exit unless $watch;
my $watcher = File::ChangeNotify->instantiate_watcher(
directories => [ @dirs, keys %include_to_main ],
filter => qr/\.scss$/,
);
say "\033[34mWatching for changes\033[0m";
while ( my @events = $watcher->wait_for_events() ) {
for my $file (map { $_->path } @events) {
verbose($file, "%s was updated");
for my $inc (@{$include_to_main{$file}}) {
my @includes = compile($inc, 1);
# From CSS::Sass::Watchdog test, we see includes are sorted
if (@includes && @{$includes{$inc}} && "@{$includes{$inc}}" ne "@includes") {
say "\033[34mRestarting to update includes\033[0m";
exec( $^X, $0, @ARGVorig ) or die "Can't re-exec myself($^X,$0): $!\n";
}
}
}
}
# Given a SCSS file, compile it and generate a .map file,
# show an error if any, and return the list of includes.
sub compile {
my ($file, $verbose) = @_;
(my $output_file = $file) =~ s/scss$/css/;
my $source_map_file = "$output_file.map";
$sass->options->{source_map_file} = $source_map_file;
my ($css, $stats) = $sass->compile_file($file);
unless ($css) {
warn "\033[31m" . $sass->last_error . "\033[0m";;
return;
}
my $written = write_if_different($output_file, $css);
if ($written) {
verbose($file, " \033[32mupdated\033[0m %s");
} elsif ($verbose) {
verbose($file, " \033[33munchanged\033[0m %s");
}
write_if_different($source_map_file, $stats->{source_map_string});
return @{$stats->{included_files} || []};
}
# Write a file, only if it has changed.
sub write_if_different {
my ($fn, $data) = @_;
my $current = File::Slurp::read_file($fn, { binmode => ':utf8', err_mode => 'quiet' });
if (!$current || $current ne $data) {
File::Slurp::write_file($fn, { binmode => ':utf8' }, $data);
return 1;
}
return 0;
}
sub verbose {
my ($file, $format) = @_;
# Strip most of file path, keep dir/file
(my $pr = $file) =~ s{.*/(.*/.*)\.scss}{$1};
say sprintf $format, $pr;
}
__END__
=head1 NAME
make_css - Generate CSS files from SCSS files, watch for changes.
=head1 SYNOPSIS
make_css [options] [dirs ...]
Options:
--verbose display more information
--watch wait for file updates and compile automatically
--help this help message
If no directories are specified, any .scss files under web/ that do not begin
with a "_" will be processed. "web/cobrands/" may be omitted from a given
directory.
=cut
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