moved dependency checking to utility module

coub-dl.py

@@ -5,7 +5,7 @@
 # terms of the Do What The Fuck You Want To Public License, Version 2,
 # as published by Sam Hocevar. See http://www.wtfpl.net/ for more details.
 
-from subprocess import call, Popen, PIPE, check_output, DEVNULL, CalledProcessError
+from subprocess import call, Popen, PIPE, DEVNULL
 from os import listdir, remove
 from os.path import splitext, exists, join
 from re import match
@@ -17,7 +17,7 @@ from signal import signal, SIGINT
 from sys import exit
 from copy import deepcopy
 import utility
-from utility import call_verbose, print_opt, get_output, temporary_directory, yes_no_question
+from utility import call_verbose, print_opt, get_output, temporary_directory, yes_no_question, check_dependencies
 
 
 class Stream(Enum):
@@ -168,20 +168,6 @@ class coub_dl:
         return get_output(('youtube-dl', '--get-title', url))
 
 
-    @staticmethod
-    @call_verbose(before_message='Checking your system for dependencies... ', after_message='Found all!')
-    def check_for_dependencies():
-        check_for = (('youtube-dl', '--version'), ('ffmpeg', '-version'))
-        error_str = '\nMissing dependencies: {}'
-        missing = []
-
-        for command in check_for:
-            try: check_output(command)
-            except (CalledProcessError, FileNotFoundError): missing.append(command[0])
-
-        if missing: exit(error_str.format(', '.join(missing)))
-
-
 def run(URL, output, extension):
     # create dict that contains files used
     FILES = deepcopy(coub_dl.default_files)
@@ -232,7 +218,7 @@ if __name__ == '__main__':
     args = parse_cmd_arguments()
     utility.VERBOSE = False if args.nonverbose else True
 
-    coub_dl.check_for_dependencies()
+    check_dependencies((('youtube-dl', '--version'), ('ffmpeg', '-version')))
 
     for url in set(args.URLs):
         print_opt('\nCreating video from {}'.format(url))

utility.py

@@ -1,7 +1,7 @@
 from functools import wraps
 from tempfile import mkdtemp
 from shutil import rmtree
-from subprocess import check_output
+from subprocess import check_output, CalledProcessError
 
 
 VERBOSE = True
@@ -55,4 +55,16 @@ class temporary_directory:
 
 
 def get_output(*args, **kwargs):
-    return check_output(*args, **kwargs).decode().rstrip('\n')
+    return check_output(*args, **kwargs).decode().rstrip('\n')
+
+
+@call_verbose(before_message='Checking your system for dependencies... ', after_message='Found all!')
+def check_dependencies(check_for):
+    error_str = '\nMissing dependencies: {}'
+    missing = []
+
+    for command in check_for:
+        try: check_output(command)
+        except (CalledProcessError, FileNotFoundError): missing.append(command[0])
+
+    if missing: exit(error_str.format(', '.join(missing)))