Update ElixirLexer and example_elixir.ex

Elixir syntax has evolved quite significantly since the initial lexer
was written. In this update I have rewritten most of the code to support
modern Elixir (as of v0.14.0-dev).

The example file has also been updated to give an quick overview
of most of the language constructs.

1 files changed, 74 insertions, 0 deletions

diff --git a/pygments/plugin.py b/pygments/plugin.py
new file mode 100644
index 00000000..103e7b71
--- /dev/null
+++ b/pygments/plugin.py
@@ -0,0 +1,74 @@
+# -*- coding: utf-8 -*-
+"""
+    pygments.plugin
+    ~~~~~~~~~~~~~~~
+
+    Pygments setuptools plugin interface. The methods defined
+    here also work if setuptools isn't installed but they just
+    return nothing.
+
+    lexer plugins::
+
+        [pygments.lexers]
+        yourlexer = yourmodule:YourLexer
+
+    formatter plugins::
+
+        [pygments.formatters]
+        yourformatter = yourformatter:YourFormatter
+        /.ext = yourformatter:YourFormatter
+
+    As you can see, you can define extensions for the formatter
+    with a leading slash.
+
+    syntax plugins::
+
+        [pygments.styles]
+        yourstyle = yourstyle:YourStyle
+
+    filter plugin::
+
+        [pygments.filter]
+        yourfilter = yourfilter:YourFilter
+
+
+    :copyright: Copyright 2006-2014 by the Pygments team, see AUTHORS.
+    :license: BSD, see LICENSE for details.
+"""
+try:
+    import pkg_resources
+except ImportError:
+    pkg_resources = None
+
+LEXER_ENTRY_POINT = 'pygments.lexers'
+FORMATTER_ENTRY_POINT = 'pygments.formatters'
+STYLE_ENTRY_POINT = 'pygments.styles'
+FILTER_ENTRY_POINT = 'pygments.filters'
+
+
+def find_plugin_lexers():
+    if pkg_resources is None:
+        return
+    for entrypoint in pkg_resources.iter_entry_points(LEXER_ENTRY_POINT):
+        yield entrypoint.load()
+
+
+def find_plugin_formatters():
+    if pkg_resources is None:
+        return
+    for entrypoint in pkg_resources.iter_entry_points(FORMATTER_ENTRY_POINT):
+        yield entrypoint.name, entrypoint.load()
+
+
+def find_plugin_styles():
+    if pkg_resources is None:
+        return
+    for entrypoint in pkg_resources.iter_entry_points(STYLE_ENTRY_POINT):
+        yield entrypoint.name, entrypoint.load()
+
+
+def find_plugin_filters():
+    if pkg_resources is None:
+        return
+    for entrypoint in pkg_resources.iter_entry_points(FILTER_ENTRY_POINT):
+        yield entrypoint.name, entrypoint.load()