add alfred socket support (--alfred-sock)

lib/alfred.py

@@ -1,20 +1,35 @@
 import subprocess
 import json
+import os
 
 
-def _fetch(data_type):
-    output = subprocess.check_output(
-        ["alfred-json", "-z", "-f", "json", "-r", str(data_type)])
-    return json.loads(output.decode("utf-8")).values()
+class Alfred(object):
+    """
+    Bindings for the alfred-json utility
+    """
+    def __init__(self, unix_sockpath=None):
+        if unix_sockpath:
+            if os.path.exists(unix_sockpath):
+                self.unix_sock = unix_sockpath
+            else:
+                raise RuntimeError('alfred: invalid unix socket path given')
 
+    def _fetch(self, data_type):
+        cmd = ['alfred-json',
+               '-z',
+               '-f', 'json',
+               '-r', data_type]
+        if self.unix_sock:
+            cmd.extend(['-s', self.unix_sock])
 
-def nodeinfo():
-    return _fetch(158)
+        output = subprocess.check_output(cmd)
+        return json.loads(output.decode("utf-8")).values()
 
+    def nodeinfo(self):
+        return self._fetch(158)
 
-def statistics():
-    return _fetch(159)
+    def statistics(self):
+        return self._fetch(159)
 
-
-def vis():
-    return _fetch(160)
+    def vis(self):
+        return self._fetch(160)