make new file detection be based on filename, instead of age

notescriber/picker.py

@@ -1,16 +1,38 @@
 import time
 import os
 
+from datetime import datetime
+
 class Picker:
 
     directory = None
     dispatcher = None
     observer = None
-    last_file_time = None
+    last_file_marker = None
 
     def __init__(self, directory, dispatcher):
         self.directory = directory
         self.dispatcher = dispatcher
+        self.last_file_marker = None
+
+    def read_last_file_marker(self):
+        if self.last_file_marker is None:
+            self.last_file_marker = datetime.now()
+        return self.last_file_marker
+
+    def update_last_file_marker(self, filename):
+        filename = filename.rstrip(".m4a")
+        marker = datetime.strptime(filename, "%Y_%m_%d_%H_%M_%S")
+        self.last_file_marker = marker
+        # TODO: also write to file, that one for later...
+
+    def find_next_file(self, files, file_marker):
+        for file in files:
+            short = os.path.basename(file).rstrip(".m4a")
+            marker = datetime.strptime(short, "%Y_%m_%d_%H_%M_%S")
+            if file_marker < marker:
+                return file
+
 
     def identify_time_window(self, file_time):
         if self.last_file_time is None:
@@ -23,17 +45,16 @@ class Picker:
         files = []
         for filename in os.listdir(self.directory):
             filepath = os.path.join(self.directory, filename)
-            if os.path.isfile(filepath):
+            if os.path.isfile(filepath) and filename.endswith(".m4a"):
                 files.append(filepath)
         return files
 
-
     def observe(self):
         while True:
+            file_marker = self.read_last_file_marker()
             files = self.list_files()
-            for file in files:
-                file_time = os.path.getmtime(file)
-                if self.identify_time_window(file_time):
-                    self.dispatcher.process_audio_file(file)
-            self.last_file_time = time.time()
+            next_file = self.find_next_file(files, file_marker)
+            if next_file is not None:
+                self.dispatcher.process_audio_file(next_file)
+                self.update_last_file_marker(os.path.basename(next_file).rstrip(".m4a"))
             time.sleep(10)