From 777f9d3fd8caf56e6bc6999a4b05379307d0733f Mon Sep 17 00:00:00 2001
From: Justin Gassner <justin.gassner@mailbox.org>
Date: Tue, 12 Sep 2023 07:36:33 +0200
Subject: Initial commit

---
 _plugins/enunciation.rb  | 32 ++++++++++++++++++++++++++++++++
 _plugins/proof.rb        | 12 ++++++++++++
 _plugins/singledollar.rb | 19 +++++++++++++++++++
 3 files changed, 63 insertions(+)
 create mode 100644 _plugins/enunciation.rb
 create mode 100644 _plugins/proof.rb
 create mode 100644 _plugins/singledollar.rb

(limited to '_plugins')

diff --git a/_plugins/enunciation.rb b/_plugins/enunciation.rb
new file mode 100644
index 0000000..75c777a
--- /dev/null
+++ b/_plugins/enunciation.rb
@@ -0,0 +1,32 @@
+module Jekyll
+  class EnunciationTagBlock < Liquid::Block
+
+    def initialize(tag_name, arg, parse_context)
+      super
+      @arg = arg.strip
+    end
+
+    def render(context)
+      text = super
+      # If the enunciation ends with a KaTeX displayed equation,
+      # then we remove the bottom margin.
+      if text[-3,3] == "$$\n"
+        text += '{: .katex-display .mb-0 }'
+      end
+      # Check if a description was given.
+      if @arg.length < 1
+        "{: .#{block_name} }\n #{text.gsub!(/^/,'> ')}"
+      else
+        "{: .#{block_name}-title }\n> #{block_name.capitalize} (#{@arg})\n>\n#{text.gsub!(/^/,'> ')}"
+      end
+    end
+
+  end
+end
+
+Liquid::Template.register_tag('definition', Jekyll::EnunciationTagBlock)
+Liquid::Template.register_tag('theorem', Jekyll::EnunciationTagBlock)
+Liquid::Template.register_tag('proposition', Jekyll::EnunciationTagBlock)
+Liquid::Template.register_tag('lemma', Jekyll::EnunciationTagBlock)
+Liquid::Template.register_tag('corollary', Jekyll::EnunciationTagBlock)
+Liquid::Template.register_tag('axiom', Jekyll::EnunciationTagBlock)
diff --git a/_plugins/proof.rb b/_plugins/proof.rb
new file mode 100644
index 0000000..ab824e5
--- /dev/null
+++ b/_plugins/proof.rb
@@ -0,0 +1,12 @@
+module Jekyll
+  class ProofTagBlock < Liquid::Block
+
+    def render(context)
+      text = super
+      "<span style=\"text-transform: uppercase; font-weight: bold; font-size: .75em;\">Proof</span> #{text} <span style=\"float:right;\">$\\square\\enspace$</span>"
+    end
+
+  end
+end
+
+Liquid::Template.register_tag('proof', Jekyll::ProofTagBlock)
diff --git a/_plugins/singledollar.rb b/_plugins/singledollar.rb
new file mode 100644
index 0000000..fe665ab
--- /dev/null
+++ b/_plugins/singledollar.rb
@@ -0,0 +1,19 @@
+# https://gist.github.com/sp301415/db9f7bee03bda483aa2ca7c0ca92fbfa
+
+require 'kramdown/parser/kramdown'
+require 'kramdown-parser-gfm'
+
+class Kramdown::Parser::GFMKatex < Kramdown::Parser::GFM
+    # Override inline math parser
+    @@parsers.delete(:inline_math)
+
+    INLINE_MATH_START = /(\$+)([^\$]+)(\$+)/m
+
+    def parse_inline_math
+        start_line_number = @src.current_line_number
+        @src.pos += @src.matched_size
+        @tree.children << Element.new(:math, @src.matched[1..-2], nil, category: :span, location: start_line_number)
+    end
+
+    define_parser(:inline_math, INLINE_MATH_START, '\$')
+end
-- 
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