add functions to only run once and catch keyboard interrupt

f_run_once.py

@@ -0,0 +1,16 @@
+import sys
+import fcntl
+import os
+
+_run_once_file_handle = 0
+
+
+def run_once():
+    global _run_once_file_handle
+
+    host_script_file_path = os.path.realpath(sys.argv[0])
+    _run_once_file_handle = open(host_script_file_path, 'r')
+    try:
+        fcntl.flock(_run_once_file_handle, fcntl.LOCK_EX | fcntl.LOCK_NB)
+    except:
+        sys.exit('Another instance already running') 

f_sigint.py

@@ -0,0 +1,6 @@
+import signal
+import sys
+
+def sigint_handler(signal, frame):
+    sys.exit(0)
+signal.signal(signal.SIGINT, sigint_handler)

main.py

@@ -1,4 +1,6 @@
+import argparse, time
 import feedparser
+import f_run_once, f_sigint
 from settings import *
 from mastodon import Mastodon
 from os.path import exists
@@ -83,6 +85,28 @@ def main():
                 for lines in send_data:
                     f.write('%s\n' %lines)
             f.close()
-            
+def startup():
+    f_run_once.run_once()
+    print("ok")
+    parser = argparse.ArgumentParser(description = "Mastodon robot posting RSS-Feeds")
+    parser.add_argument('--daemon', dest='daemon', action='store_true', help='run in daemon mode and repeat after a delay')
+    parser.add_argument('--delay', dest='daemon_delay', action='store', type=int, help='number of seconds to wait for next run default=3600')
+    args = parser.parse_args()
+    run_as_daemon = False
+    if args.daemon or args.daemon_delay:
+        run_as_daemon = True
+    if run_as_daemon:
+        daemon_delay = 3600
+        if args.daemon_delay:
+            daemon_delay = args.daemon_delay
+        if daemon_delay == 0 or not isinstance(daemon_delay, int):
+            daemon_delay = 3600
+
+    if run_as_daemon:
+        while True:
+            main()
+            time.sleep(daemon_delay)
+    else:
+        main()
 if __name__ == "__main__":
-    main()
+    startup()