Add a code plugin, for sending highlighted snippets of code.

plugins/code.py

@@ -0,0 +1,44 @@
+"""
+This plugin adds a :term:`/code` command, to send syntax highlighted snippets
+of code using pygments and XHTML-IM (XEP-0071).
+
+Install
+-------
+
+Either use your distribution tools to install python3-pygments or equivalent,
+or run:
+
+.. code-block:: shell
+
+    pip install --user pygments
+
+Usage
+-----
+
+.. glossary::
+
+    /code <language> <snippet>
+
+        Run this command to send the <snippet> of code, syntax highlighted
+        using pygments’s <language> lexer.
+"""
+
+from plugin import BasePlugin
+
+from pygments import highlight
+from pygments.lexers import get_lexer_by_name
+from pygments.formatters import HtmlFormatter
+FORMATTER = HtmlFormatter(noclasses=True)
+
+class Plugin(BasePlugin):
+    def init(self):
+        self.api.add_command('code', self.command_code,
+                usage='<message>',
+                short='Sends syntax-highlighted code',
+                help='Sends syntax-highlighted code in the current tab')
+
+    def command_code(self, args):
+        language, code = args.split(None, 1)
+        lexer = get_lexer_by_name(language)
+        room = self.api.current_tab()
+        room.command_xhtml(highlight(code, lexer, FORMATTER).strip().replace('\n</pre>', '</pre>'))