From 7edb003cd1c9b53ffdff11ef85532e39f08db16d Mon Sep 17 00:00:00 2001
From: Luke Shumaker <lukeshu@sbcglobal.net>
Date: Fri, 6 Jan 2017 19:50:45 -0500
Subject: wip

---
 lib/pandoc.rb | 96 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 96 insertions(+)
 create mode 100644 lib/pandoc.rb

(limited to 'lib/pandoc.rb')

diff --git a/lib/pandoc.rb b/lib/pandoc.rb
new file mode 100644
index 0000000..f0bf3f6
--- /dev/null
+++ b/lib/pandoc.rb
@@ -0,0 +1,96 @@
+# coding: utf-8
+require 'open3'
+require 'json'
+
+module Pandoc
+	def self.prog
+		@prog ||= 'pandoc'
+	end
+	def self.prog=(val)
+		@prog = val
+	end
+	def self.load(fmt, input)
+		cmd = Pandoc::prog + " -t json"
+		unless fmt.nil?
+			cmd += " -f " + fmt
+		end
+		str = input
+		if str.respond_to? :read
+			str = str.read
+		end
+		json = ''
+		errors = ''
+		Open3::popen3(cmd) do |stdin, stdout, stderr|
+			stdin.puts(str)
+			stdin.close
+			json = stdout.read
+			errors = stderr.read
+		end
+		unless errors.empty?
+			raise errors
+		end
+		return Pandoc::AST::new(json)
+	end
+
+	class AST
+		def initialize(json)
+			@js = JSON::parse(json)
+		end
+
+		def [](key)
+			Pandoc::AST::js2sane(@js["meta"][key])
+		end
+
+		def js
+			@js
+		end
+
+		def to(format)
+			cmd = Pandoc::prog + " -f json -t " + format.to_s
+			output = ''
+			errors = ''
+			Open3::popen3(cmd) do |stdin, stdout, stderr|
+				stdin.puts @js.to_json
+				stdin.close
+				output = stdout.read
+				errors = stderr.read
+			end
+			unless errors.empty?
+				raise errors
+			end
+			return output
+		end
+
+		def self.js2sane(js)
+			if js.nil?
+				return js
+			end
+			case js["t"]
+			when "MetaMap"
+				Hash[js["c"].map{|k,v| [k, js2sane(v)]}]
+			when "MetaList"
+				js["c"].map{|c| js2sane(c)}
+			when "MetaBool"
+				js["c"]
+			when "MetaString"
+				js["c"]
+			when "MetaInlines"
+				js["c"].map{|c| js2sane(c)}.join()
+			when "MetaBlocks"
+				js["c"].map{|c| js2sane(c)}.join("\n")
+			when "Str"
+				js["c"]
+			when "Space"
+				" "
+			when "RawInline"
+				js["c"][1]
+			when "RawBlock"
+				js["c"][1]
+			when "Para"
+				js["c"].map{|c| js2sane(c)}.join()
+			else
+				throw js["t"]
+			end
+		end
+	end
+end
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