1 files changed, 29 insertions, 0 deletions
diff --git a/ql/completer.py b/ql/completer.py
new file mode 100644
index 0000000..a9b7d8d
--- /dev/null
+++ b/ql/completer.py
@@ -0,0 +1,29 @@
+import readline
+
+
+class Completer(object):
+
+    @classmethod
+    def install_new_completer(cls, options):
+        completer = cls(options)
+        readline.set_completer(completer.complete)
+        readline.set_completer_delims('')  # allow options with whitespace
+        readline.parse_and_bind('tab: complete')
+
+    def __init__(self, options):
+        self.options = options
+
+    def complete(self, text, state):
+        text = text.lower()
+        if state == 0:  # on first trigger, build possible matches
+            if text:  # cache matches (entries that start with entered text)
+                self.matches = [s for s in self.options
+                                    if s and s.lower().startswith(text)]
+            else:  # no text entered, all matches possible
+                self.matches = self.options[:]
+
+        # return match indexed by state
+        try:
+            return self.matches[state]
+        except IndexError:
+            return None