lib/markdown2/nitmd.nit

   1 # This file is part of NIT ( http://www.nitlanguage.org ).
   2 #
   3 # Licensed under the Apache License, Version 2.0 (the "License");
   4 # you may not use this file except in compliance with the License.
   5 # You may obtain a copy of the License at
   6 #
   7 #     http://www.apache.org/licenses/LICENSE-2.0
   8 #
   9 # Unless required by applicable law or agreed to in writing, software
  10 # distributed under the License is distributed on an "AS IS" BASIS,
  11 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12 # See the License for the specific language governing permissions and
  13 # limitations under the License.
  14
  15 # A Markdown parser for Nit.
  16 module nitmd
  17
  18 import markdown_html_rendering
  19 import markdown_md_rendering
  20 import markdown_man_rendering
  21 import markdown_latex_rendering
  22
  23 import config
  24
  25 var opt_to = new OptionString("Specify output format (html, md, man, latex)", "-t", "--to")
  26
  27 var usage = new Buffer
  28 usage.append "Usage: nitmd [-t format] [file.md]\n"
  29 usage.append "Translate Markdown documents to other formats.\n\n"
  30 usage.append "If no argument, read the Markdown input from `stdin`."
  31
  32 var config = new Config
  33 config.add_option(opt_to)
  34 config.tool_description = usage.write_to_string
  35
  36 config.parse_options(args)
  37 if config.args.length > 1 then
  38         config.usage
  39         exit 1
  40 end
  41
  42 var md
  43 if config.args.is_empty then
  44         md = sys.stdin.read_all
  45 else
  46         var file = config.args.first
  47         if not file.file_exists then
  48                 print "'{file}' not found"
  49                 exit 1
  50         end
  51         md = file.to_path.read_all
  52 end
  53
  54 # Parse the input
  55 var parser = new MdParser
  56 var node = parser.parse(md)
  57
  58 var renderer: MdRenderer
  59 var to = opt_to.value
  60 if to == null or to == "html" then
  61         renderer = new HtmlRenderer
  62 else if to == "md" then
  63         renderer = new MarkdownRenderer
  64 else if to == "man" then
  65         renderer = new ManRenderer
  66 else if to == "latex" then
  67         renderer = new LatexRenderer
  68 else
  69         print "Unknown output format: {to}"
  70         exit 1
  71         return
  72 end
  73 printn renderer.render(node)