Provide file output for status

This allows to have better atomicity than shell redirection

src/surykatka/bot.py

@@ -51,6 +51,8 @@ from .ssl import (
 )
 import datetime
 from email.utils import parsedate_to_datetime
+import tempfile
+import os
 
 
 __version__ = "0.6.0"
@@ -645,24 +647,39 @@ class WebBot:
                     float(self.config["WARNING_PERIOD"]),
                 )
             if self.config["FORMAT"] == "json":
-                print(json.dumps(status_dict))
+                status_output = json.dumps(status_dict)
             else:
+                status_list = []
+                append_status = status_list.append
                 for table_key in status_dict:
-                    print("# %s" % table_key)
-                    print("")
+                    append_status("# %s" % table_key)
+                    append_status("")
                     table = status_dict[table_key]
                     if table:
                         # Print the header
                         table_key_list = [x for x in table[0].keys()]
                         table_key_list.sort()
-                        print(" | ".join(table_key_list))
+                        append_status(" | ".join(table_key_list))
                         for line in table:
-                            print(
+                            append_status(
                                 " | ".join(
                                     ["%s" % (line[x]) for x in table_key_list]
                                 )
                             )
-                        print("")
+                        append_status("")
+                status_output = "\n".join(status_list)
+            if self.config["STDOUT"] == "":
+                print(status_output)
+            else:
+                # https://blog.gocept.com/2013/07/15/reliable-file-updates-with-python/#write-replace
+                with tempfile.NamedTemporaryFile(
+                    "w",
+                    dir=os.path.dirname(self.config["STDOUT"]),
+                    delete=False,
+                ) as temp_file:
+                    temp_file.write(status_output)
+                    temp_file_name = temp_file.name
+                os.rename(temp_file_name, self.config["STDOUT"])
 
 
 def create_bot(**kw):

src/surykatka/cli.py

@@ -48,6 +48,9 @@ from .bot import create_bot
     help="Reload the configuration file between each crawl.",
     show_default=True,
 )
+@click.option(
+    "--stdout", help="File to store status. (default: stdout)", default=""
+)
 @click.option(
     "--output",
     "-o",
@@ -69,6 +72,7 @@ def runSurykatka(
     warning,
     configuration,
     reload,
+    stdout,
     output,
     profile,
 ):
@@ -91,6 +95,7 @@ def runSurykatka(
         mapping["NAMESERVER"] = nameserver
     if reload:
         mapping["RELOAD"] = str(reload)
+    mapping["STDOUT"] = stdout
     mapping["FORMAT"] = output
     bot = create_bot(cfgfile=configuration, mapping=mapping)
     if profile is None: