added log file

README.md

@@ -234,6 +234,12 @@ Are you interested in how the idea of Video2X was born? Do you want to know the
 ### -c CONFIG, --config CONFIG
     video2x config file path
 
+### --log LOG
+    log file path (default: program_directory\video2x_%Y-%m-%d_%H-%M-%S.log)
+
+### --nolog
+    disable logging (default: False)
+
 ### -v, --version
     display version, lawful information and exit
 

src/bilogger.py

@@ -0,0 +1,33 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+"""
+Creator: Video2X Bidirectional Logger
+Author: K4YT3X
+Date Created: June 4, 2020
+Last Modified: June 4, 2020
+"""
+
+# built-in imports
+import _io
+import pathlib
+
+
+class BiLogger(object):
+    """ A bidirectional logger that both prints the output
+    and log all output to file.
+
+    Original code from: https://stackoverflow.com/a/14906787
+    """
+
+    def __init__(self, terminal: _io.TextIOWrapper, logfile: pathlib.Path):
+        self.terminal = terminal
+        self.log = logfile.open(mode='a+')
+
+    def write(self, message):
+        self.terminal.write(message)
+        self.terminal.flush()
+        self.log.write(message)
+        self.log.flush()
+
+    def flush(self):
+        pass

src/video2x.py

@@ -49,12 +49,14 @@ smooth and edges sharp.
 """
 
 # local imports
+from bilogger import BiLogger
 from upscaler import AVAILABLE_DRIVERS
 from upscaler import UPSCALER_VERSION
 from upscaler import Upscaler
 
 # built-in imports
 import argparse
+import datetime
 import gettext
 import importlib
 import locale
@@ -79,8 +81,7 @@ language = gettext.translation(DOMAIN, LOCALE_DIRECTORY, [default_locale], fallb
 language.install()
 _ = language.gettext
 
-
-CLI_VERSION = '4.0.1'
+CLI_VERSION = '4.1.0'
 
 LEGAL_INFO = _('''Video2X CLI Version: {}
 Upscaler Version: {}
@@ -118,6 +119,9 @@ def parse_arguments():
 
     video2x_options.add_argument('-c', '--config', type=pathlib.Path, help=_('video2x config file path'), action='store',
                                  default=pathlib.Path(__file__).parent.absolute() / 'video2x.yaml')
+    video2x_options.add_argument('--log', type=pathlib.Path, help=_('log file path'),
+                                 default=pathlib.Path(__file__).parent.absolute() / f'video2x_{datetime.datetime.now().strftime("%Y-%m-%d_%H-%M-%S")}.log')
+    video2x_options.add_argument('--nolog', help=_('disable logging'), action='store_true')
     video2x_options.add_argument('-v', '--version', help=_('display version, lawful information and exit'), action='store_true')
 
     # scaling options
@@ -179,6 +183,13 @@ if video2x_args.version:
     print(LEGAL_INFO)
     sys.exit(0)
 
+# redirect output to both terminal and log file
+if video2x_args.nolog is False:
+    LOGFILE = video2x_args.log
+    Avalon.debug_info(_('Redirecting console logs to {}').format(LOGFILE))
+    sys.stdout = BiLogger(sys.stdout, LOGFILE)
+    sys.stderr = BiLogger(sys.stderr, LOGFILE)
+
 # read configurations from configuration file
 config = read_config(video2x_args.config)
 

src/video2x_gui.py

@@ -8,12 +8,14 @@ Last Modified: June 4, 2020
 """
 
 # local imports
+from bilogger import BiLogger
 from upscaler import UPSCALER_VERSION
 from upscaler import Upscaler
 from wrappers.ffmpeg import Ffmpeg
 
 # built-in imports
 import contextlib
+import datetime
 import json
 import mimetypes
 import os
@@ -32,7 +34,7 @@ from PyQt5.QtGui import *
 from PyQt5.QtWidgets import *
 import magic
 
-GUI_VERSION = '2.5.1'
+GUI_VERSION = '2.6.0'
 
 LEGAL_INFO = f'''Video2X GUI Version: {GUI_VERSION}\\
 Upscaler Version: {UPSCALER_VERSION}\\
@@ -190,6 +192,9 @@ class Video2XMainWindow(QMainWindow):
         super().__init__(*args, **kwargs)
         uic.loadUi(str(resource_path('video2x_gui.ui')), self)
 
+        # generate log file name
+        self.logfile = pathlib.Path(__file__).parent.absolute() / f'video2x_{datetime.datetime.now().strftime("%Y-%m-%d_%H-%M-%S")}.log'
+
         # create thread pool for upscaler workers
         self.threadpool = QThreadPool()
 
@@ -1032,8 +1037,9 @@ class Video2XMainWindow(QMainWindow):
 {}\\
 Check the console output for details.\\
 When reporting an error, please include console output.\\
-You can [submit an issue on GitHub](https://github.com/k4yt3x/video2x/issues/new?assignees=K4YT3X&labels=bug&template=bug-report.md&title={}) to report this error.'''
-        message_box.setText(error_message.format(exception, urllib.parse.quote(str(exception))))
+You can [submit an issue on GitHub](https://github.com/k4yt3x/video2x/issues/new?assignees=K4YT3X&labels=bug&template=bug-report.md&title={}) to report this error.\\
+It\'s also highly recommended for you to attach the [log file]({}) under the programs\'s parent folder named {}.'''
+        message_box.setText(error_message.format(exception, urllib.parse.quote(str(exception)), self.logfile.as_uri(), self.logfile.name))
         message_box.exec_()
 
     def progress_monitor(self, progress_callback: pyqtSignal):
@@ -1137,6 +1143,10 @@ You can [submit an issue on GitHub](https://github.com/k4yt3x/video2x/issues/new
                 self.show_warning('Output path unspecified')
                 return
 
+            print(f'Redirecting console logs to {self.logfile}', file=sys.stderr)
+            sys.stdout = BiLogger(sys.stdout, self.logfile)
+            sys.stderr = BiLogger(sys.stderr, self.logfile)
+
             if len(self.input_table_data) == 1:
                 input_directory = self.input_table_data[0]
             else: