Convert stylesheet to SCSS and preprocess with SASS.

[homepage.git] / lib / css-source.rb

diff --git a/lib/css-source.rb b/lib/css-source.rb
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+++ b/lib/css-source.rb
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+# Nick's web site: css_source filter.  Add a notice to generated CSS
+# files where the reader may find the source code.
+#
+# Copyright © 2020 Nick Bowler
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+class CssSourceFilter < Nanoc::Filter
+    identifier :css_source
+
+    def run(content, params = {})
+        srcuri = if params[:uribase]
+            then params[:uribase] + item_source(@item) end
+        copypattern = /\/\*.*?[Cc]opyright.*?\*\//m
+        css = content.gsub(copypattern, "")
+        css.gsub!(/^@charset.*?$\n?/m, "")
+
+        begin
+            copymsgs = @item.compiled_content(snapshot: :css_source)
+        rescue Nanoc::Core::Errors::NoSuchSnapshot
+            copymsgs = content
+        end
+        copymsgs = copymsgs.scan(copypattern)
+
+        ["/*",
+         " * Generated file, do not edit!",
+         " * Compiled from " + item_source(@item) + " on " +
+            Time.now.gmtime.strftime("%Y-%m-%d %H:%M UTC"),
+         if srcuri then
+            " * Source code is available online at <" + srcuri + ">"
+         end, "*/", copymsgs, css].compact.join("\n")
+    end
+end