use which from stdlib instead our own version

lib/svtplay_dl/postprocess/__init__.py

@@ -3,12 +3,13 @@ from random import sample
 import os
 import platform
 import re
+from shutil import which
 from requests import post, codes, Timeout
 from re import match
 
 from svtplay_dl.log import log
 from svtplay_dl.utils.output import formatname
-from svtplay_dl.utils.proc import which, run_program
+from svtplay_dl.utils.proc import run_program
 
 
 class postprocess(object):

lib/svtplay_dl/utils/getmedia.py

@@ -2,6 +2,7 @@ import os
 import sys
 import copy
 import logging
+from shutil import which
 
 
 from svtplay_dl.log import log
@@ -90,7 +91,6 @@ def get_one_media(stream):
         return
 
     if stream.config.get("merge_subtitle"):
-        from svtplay_dl.utils.proc import which
         if not which('ffmpeg'):
             log.error("--merge-subtitle needs ffmpeg. Please install ffmpeg.")
             log.info("https://ffmpeg.org/download.html")

lib/svtplay_dl/utils/proc.py

@@ -1,34 +1,7 @@
-import platform
 import subprocess
 import logging
 
 
-def which(program):
-    import os
-
-    if platform.system() == "Windows":
-        program = "{0}.exe".format(program)
-
-    def is_exe(fpath):
-        return os.path.isfile(fpath) and os.access(fpath, os.X_OK)
-
-    fpath, fname = os.path.split(program)
-    if fpath:
-        if is_exe(program):
-            return program
-    else:
-        for path in os.environ["PATH"].split(os.pathsep):
-            path = path.strip('"')
-            exe_file = os.path.join(path, program)
-            if is_exe(exe_file):
-                return exe_file
-        if os.path.isfile(program):
-            exe_file = os.path.join(os.getcwd(), program)
-            if is_exe(exe_file):
-                return exe_file
-    return None
-
-
 def run_program(cmd, show=True):
     p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, stdin=subprocess.PIPE)
     stdout, stderr = p.communicate()