Add SASS compiler script and make target

- Tries to use `sass` first
- If no `sass` is present, tries to compile with CSS::Sass module

Author: zoffixznet

Makefile

@@ -15,6 +15,9 @@ html-nohighlight:
 sparse:
 	perl6 htmlify.p6 --no-highlight --sparse=10
 
+sass:
+	./util/compile-sass.sh
+
 webdev-build:
 	perl6 htmlify.p6 --no-highlight --sparse=200
 

util/compile-sass.sh

@@ -0,0 +1,32 @@
+#!/bin/bash
+#
+# This script compiles site's SASS into CSS
+# It requires either the presence of `sass` command (which will be tried first)
+# or the CSS::Sass Perl 5 module: https://metacpan.org/pod/CSS::Sass
+#
+
+if command -v sass >/dev/null 2>&1; then
+	sass -t compressed assets/sass/style.scss:html/css/style.css &&
+	echo "Successfully compiled SASS using 'sass' command" ||
+	{ echo "Failed to compile SASS with 'sass' command"; exit 1; }
+elif perl -MCSS::Sass -e '' >/dev/null 2>&1 ; then
+	perl -MData::Dumper -MCSS::Sass -wlE '
+        my ($css, $err, $stats) = CSS::Sass::sass_compile_file(
+			"assets/sass/style.scss",
+			output_style => SASS_STYLE_COMPRESSED
+		);
+		if (defined $err) {
+			print Dumper $stats;
+			say "Failed to compile sass (see diagnostics above)";
+			exit 1
+		};
+		my $f = "html/css/style.css";
+		open my $fh, ">", $f or
+			die "Failed to open $f to write CSS into: $!";
+		print $fh $css;
+	' && echo "Successfully compiled SASS using CSS::Sass module" ||
+		{ echo "Failed to compile SASS with CSS::Sass module"; exit 1; }
+else
+    echo "Need either 'sass' command or CSS::Sass Perl 5 module"
+	exit 1;
+fi