From de7a450d92eabd4d1229611effaef1aef22d4589 Mon Sep 17 00:00:00 2001
From: "Paul R. Tagliamonte" <paultag@debian.org>
Date: Thu, 28 Mar 2013 21:42:40 -0400
Subject: [PATCH] Adding in a completer.

---
 bin/hy          |  4 +++-
 hy/completer.py | 41 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 44 insertions(+), 1 deletion(-)
 create mode 100644 hy/completer.py

diff --git a/bin/hy b/bin/hy
index f1fbd70..fbb396d 100755
--- a/bin/hy
+++ b/bin/hy
@@ -22,6 +22,8 @@ from hy.lex.machine import Machine
 from hy.compiler import hy_compile
 from hy.core import process
 
+import hy.completer
+
 from hy.macros import macro
 from hy.models.expression import HyExpression
 from hy.models.string import HyString
@@ -120,7 +122,7 @@ try:
 except IOError:
     open(history, 'wa').close()
 
-# readline.parse_and_bind("tab: complete")
+readline.parse_and_bind("tab: complete")
 
 hr = HyREPL()
 hr.interact("{appname} {version}".format(
diff --git a/hy/completer.py b/hy/completer.py
new file mode 100644
index 0000000..f14ec28
--- /dev/null
+++ b/hy/completer.py
@@ -0,0 +1,41 @@
+import hy.macros
+import hy.compiler
+
+import __builtin__
+
+
+PATH = [hy.compiler._compile_table, hy.macros._hy_macros, __builtin__.__dict__]
+
+
+class Completer:
+    def __init__(self, namespace = None):
+        if namespace and not isinstance(namespace, dict):
+            raise TypeError,'namespace must be a dictionary'
+        self.namespace = namespace
+
+    def complete(self, text, state):
+        path = PATH
+        if self.namespace:
+            path.append(self.namespace)
+
+        matches = []
+
+        for p in path:
+            p = filter(lambda x: isinstance(x, str), p.keys())
+            p = [x.replace("_", "-") for x in p]
+            [matches.append(x) for x in
+                filter(lambda x: x.startswith(text), p)]
+
+        try:
+            return matches[state]
+        except IndexError:
+            return None
+
+
+try:
+    import readline
+except ImportError:
+    pass
+else:
+    readline.set_completer(Completer().complete)
+    readline.set_completer_delims("()[]{}")