Migrate documentation to LaTeX

rakelib/doc.rake

@@ -0,0 +1,23 @@
+# This Source Code Form is subject to the terms of the Mozilla Public License,
+# v. 2.0. If a copy of the MPL was not distributed with this file, You can
+# obtain one at https://mozilla.org/MPL/2.0/.
+# frozen_string_literal: true
+
+require 'pathname'
+require 'rake/clean'
+
+CLEAN.include 'build/doc'
+
+directory 'build/doc'
+
+rule /build\/doc\/\w+.pdf/ => lambda { |t|
+  [
+    Pathname.new(t).relative_path_from('build').sub_ext('.tex').to_path,
+    'build/doc'
+  ]
+} do |t|
+  sh 'pdflatex', '--output-directory', 'build/doc', t.prerequisites.first
+end
+
+desc 'Generate documentation'
+task doc: 'build/doc/language.pdf'

rakelib/ninja.rake

@@ -3,6 +3,7 @@
 # obtain one at https://mozilla.org/MPL/2.0/.
 # frozen_string_literal: true
 
+require 'pathname'
 require 'rake/clean'
 
 CLEAN.include 'build/boot', 'build/valid'