Added percentage counter

bin/flac2pod

@@ -2,8 +2,11 @@
 
 # external modules
 
-from os import path, system, walk
+from os import cpu_count, path, walk
 from pathlib import Path
+from sys import argv, exit as s_exit
+from time import sleep
+from subprocess import check_output, Popen
 
 
 # utility functions
@@ -35,21 +38,42 @@ def create_destination():
 
 
 def scan_destination_convert_mp3():
+    _i, _total_files = 0, len(source_directories)
     for _file in source_directories[1]:
         if not Path(f"{_file.replace(path.expanduser(source), path.expanduser(destination))}.mp3").is_file():
-            _file_s = _file.replace(' ', '\\ ').replace("'", "\\'") + '.flac'
-            _file_d = _file.replace(path.expanduser(source),
-                                    path.expanduser(destination)).replace(' ', '\\ ').replace("'", "\\'") + '.mp3'
-            print(f"\n\u001b[38;5;0;48;5;15mConverting {_file_s} to {_file_d}...\u001b[0m\n")
-            system(f"ffmpeg -i {_file_s} -c:v copy -ab 320k -map_metadata 0 -id3v2_version 3 {_file_d}")
-            rg2sc(_file_d)
+            _file_s = _file.replace(' ', '\\ ').replace("'", "\\'").replace(')', '\\)').replace('(', '\\(').replace\
+                          ('&', '\\&').replace('`', '\\`').replace('$', '\\$') + '.flac'
+            _file_d = _file.replace(path.expanduser(source), path.expanduser(destination)).replace(' ', '\\ ')\
+                          .replace("'", "\\'").replace(')', '\\)').replace('(', '\\(').replace('&', '\\&')\
+                          .replace('`', '\\`').replace('$', '\\$') + '.mp3'
+            _active_processes = int(check_output('ps -C ffmpeg | wc -l', shell=True)) - 1
+            if _active_processes >= cpu_count():
+                while _active_processes >= cpu_count():
+                    print(f"\nThere are already {cpu_count()} processes running...\n")
+                    sleep(1)
+                    _active_processes = int(check_output('ps -C ffmpeg | wc -l', shell=True)) - 1
+            _i += 1
+            _progress = _i / _total_files
+            print(f"\n{_progress}% | \u001b[38;5;0;48;5;15mConverting {_file_s} to {_file_d}...\u001b[0m\n")
+            if '-s' in arguments:
+                _cmd = f"screen -DmS flac2pod{_i} ffmpeg -i {_file_s} -map 0:a -ab 320k -map_metadata 0" \
+                       f" -id3v2_version 3 {_file_d} </dev/null; rg2sc -f -s {_file_d}"
+            else:
+                _cmd = f"screen -DmS flac2pod{_i} ffmpeg -i {_file_s} -c:v copy -ab 320k -map_metadata 0" \
+                       f" -id3v2_version 3 {_file_d} </dev/null; rg2sc -f {_file_d}"
+            Popen(_cmd, shell=True)
+    _active_processes = int(check_output('ps -C ffmpeg | wc -l', shell=True)) - 1
+    while _active_processes != 0:
+        print('\nPlease wait for the remaining conversions to complete...\n')
+        sleep(1)
+        _active_processes = int(check_output('ps -C ffmpeg | wc -l', shell=True)) - 1
+    sleep(1)
+    print('\niPod conversion complete!\n')
+    s_exit()
 
 
-def rg2sc(_file):
-    system(f"rg2sc -f {_file}")
-
-
-# program start sequence
+# retrieve typed argument
+arguments = argv
 
 source = input('Source parent directory: ')
 if source.endswith('/'):