Clean Functionality

1. Clean functionality ( running flow clean )
2. New md5 entry files have data to mark them as new and md5 sum is
not immediatly updated in them.
3. Output art and changes

flow

@@ -1,13 +1,35 @@
 #!/usr/bin/python3
 
-import os
+import os # for checking if file exists
-import hashlib
+import hashlib # for md5sum
-from subprocess import run
+import sys  # for reading cmd args
+import shutil # for removind directories recursively
+from subprocess import run # running external programs
 
 build_files_src = {}
 build_files_level = {}
 build_files_toBuild = {}
 
+# Taken from https://www.asciiart.eu/nature/deserts
+done_art = r"""
+    .    _    +     .  ______   .          .
+ (      /|\      .    |      \      .   +
+     . |||||     _    | |   | | ||         .
+.      |||||    | |  _| | | | |_||    .
+   /\  ||||| .  | | |   | |      |       .
+__||||_|||||____| |_|_____________\__________
+. |||| |||||  /\   _____      _____  .   .
+  |||| ||||| ||||   .   .  .         ________
+ . \|`-'|||| ||||    __________       .    .
+    \__ |||| ||||      .          .     .
+ __    ||||`-'|||  .       .    __________
+.    . |||| ___/  ___________             .
+   . _ ||||| . _               .   _________
+_   ___|||||__  _ \\--//    .          _
+     _ `---'    .)=\oo|=(.   _   .   .    .
+_  ^      .  -    . \.|
+"""
+
 def check_if_file(filename, build_file_name):
     """ Checks it the given file exists, else print error and exit """
     if os.path.isfile(filename):
@@ -39,6 +61,11 @@ def update_md5(filename):
     with open(".flow/" + fname, "w") as f:
         f.write(getmd5(filename).strip())
 
+def create_md5(filename):
+    """ Takes the filename in .flow as var fname and updates it's md5sum value according to contents of var filename """
+    fname = get_meta_file(filename)
+    with open(".flow/" + fname, "w") as f:
+        f.write("new file")
 
 def getstoredmd5(filename):
     """ get value of file's md5 from .flow folder, else create entry. return the (md5, createdEntry)"""
@@ -49,7 +76,7 @@ def getstoredmd5(filename):
             md5_returned = f.readline()
     else:
         print("INFO : md5sum entry not present for " + filename + " creating one.")
-        update_md5(filename)
+        create_md5(filename)
     return md5_returned
 
 def recieved_file(filename, level, rebuild):
@@ -101,15 +128,44 @@ def recieved_file(filename, level, rebuild):
         recieved_file(entry, level + 1, build_files_toBuild[filename])
 
 
+def remove_if_exists(filename):
+    """ Check if the given filename exists, if yes then print filename and delete """
+    if os.path.isfile(filename):
+        print("Deleting " + filename)
+        os.remove(filename)
 
 def main():
     with open("build.flow", "r") as main_build_file:
         if not os.path.exists(".flow"):
             os.makedirs(".flow")
+
+        """ flow clean """
+        for i in sys.argv:
+            if i == "clean":
+                # delete the .flow folder
+                if os.path.exists(".flow"):
+                    print("Deleting .flow directory")
+                    shutil.rmtree(".flow")
+
+                # delete the mentioned files
+                cleaning_started = False
+                for line in main_build_file:
+                    entry = line.strip()
+                    if cleaning_started:
+                        remove_if_exists(entry)
+                    if entry == ";!remove!;":
+                        cleaning_started = True
+                print("Cleaning done")
+                exit(0)
+                        
+
+        """ creating data for build process """
         for line in main_build_file:
             entry = line.strip()
             
-            if os.path.isfile(entry):
+            if entry == ";!remove!;":
+                break
+            elif os.path.isfile(entry):
                 recieved_file(entry, 0, False)
             else:
                 print("ERROR : " + entry + " is neither a file or a directory")
@@ -119,10 +175,10 @@ def main():
     print(build_files_src)
     print(build_files_toBuild)
     print()
-    print("┅ ┅ ┅ ┅ ┅ ┅ ┅ ┅ ┅ ┅ ┅ ┅ ┅ ┅ ┅ ┅ ┅ ┅ ┅ ┅ ")
+    print("<-> <-> <-> <-> <-> <-> <-> <-> <-> <-> <-> <-> <-> <-> <-> <->")
     print()
 
-    """ Build by using the data structures """
+    """ Build by using the data """
     for f, x  in list(build_files_toBuild.items()):
         if x == False:
             del build_files_level[f]
@@ -150,4 +206,12 @@ def main():
         for src_file in build_files_src[build_file_name]:
             update_md5(src_file)
 
-main()
+    print(done_art)
+    print("Build Completed Successfully")
+    print()
+    print("<-> <-> <-> <-> <-> <-> <-> <-> <-> <-> <-> <-> <-> <-> <-> <->")
+    print()
+
+
+if __name__ == "__main__":
+    main()