lib/markdown2: introduce nitmd client

Signed-off-by: Alexandre Terrasa <[email protected]>

lib/markdown2/nitmd.nit

@@ -0,0 +1,73 @@
+# This file is part of NIT ( http://www.nitlanguage.org ).
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# A Markdown parser for Nit.
+module nitmd
+
+import markdown_html_rendering
+import markdown_md_rendering
+import markdown_man_rendering
+import markdown_latex_rendering
+
+import config
+
+var opt_to = new OptionString("Specify output format (html, md, man, latex)", "-t", "--to")
+
+var usage = new Buffer
+usage.append "Usage: nitmd [-t format] [file.md]\n"
+usage.append "Translate Markdown documents to other formats.\n\n"
+usage.append "If no argument, read the Markdown input from `stdin`."
+
+var config = new Config
+config.add_option(opt_to)
+config.tool_description = usage.write_to_string
+
+config.parse_options(args)
+if config.args.length > 1 then
+	config.usage
+	exit 1
+end
+
+var md
+if config.args.is_empty then
+	md = sys.stdin.read_all
+else
+	var file = config.args.first
+	if not file.file_exists then
+		print "'{file}' not found"
+		exit 1
+	end
+	md = file.to_path.read_all
+end
+
+# Parse the input
+var parser = new MdParser
+var node = parser.parse(md)
+
+var renderer: MdRenderer
+var to = opt_to.value
+if to == null or to == "html" then
+	renderer = new HtmlRenderer
+else if to == "md" then
+	renderer = new MarkdownRenderer
+else if to == "man" then
+	renderer = new ManRenderer
+else if to == "latex" then
+	renderer = new LatexRenderer
+else
+	print "Unknown output format: {to}"
+	exit 1
+	return
+end
+printn renderer.render(node)