Add session files base concept.

naive-nlu/tree_nlu/session/org_mode.py

@@ -0,0 +1,45 @@
+import logging
+import datetime
+
+SESSION = None
+
+
+def __gen_session_name__():
+    now = datetime.datetime.utcnow()
+    return "treeNLU-session-{}.org".format(
+        now.strftime("%y_%m_%d %H:%M:%S_%f"))
+
+
+def create_global_session(fname):
+    global SESSION
+    SESSION = OrgModeSession(fname)
+
+
+def global_session():
+    if SESSION is None:
+        session_name = __gen_session_name__()
+        logging.warn("Session not created, saved on {}".format(session_name))
+        create_global_session(session_name)
+
+    assert(SESSION is not None)
+    return SESSION
+
+
+class OrgModeSession:
+    def __init__(self, fname):
+        self.f = open(fname, 'wt')
+        self.last_level = 0
+
+    def annotate(self, annotation):
+        self.f.write("{indentation} {data}\n".format(
+            indentation=' ' * (self.last_level + 2 + 1),
+            data=annotation))
+
+    def log_step(self, string, level):
+        self.f.write("{indentation} {data}\n".format(
+            indentation='*' * (level + 1),
+            data=string))
+        self.last_level = level
+
+    def close(self):
+        self.f.close()