chext

#!/usr/bin/env python3

#################### ALESSANDRO RIDOLFI ########################
#                        Version 1.1                           #
#                   Cagliari, August 2023                      #
################################################################


import sys, os, os.path, glob



#ARGOMENTI DA SHELL
string_version = "1.1 (28Aug2023)"
flag_force = 0

if "-f" in sys.argv:
        sys.argv.remove("-f")
        flag_force = 1

if (len(sys.argv) == 1 or ("-h" in sys.argv) or ("-help" in sys.argv) or ("--help" in sys.argv)):
        print("USAGE1: %s oldext newext" % (os.path.basename(sys.argv[0])))
        print("USAGE2: %s -old \"oldext\" -new \"newext\" -files \"<files*.ar>\" [-f]" % (os.path.basename(sys.argv[0])))
        print()
        print(" -f: force the changes without asking for confirmation")
        exit()
elif (("-version" in sys.argv) or ("--version" in sys.argv)):
        print("Version: %s" % (string_version))
        exit()
elif len(sys.argv) == 3:
        oldext = sys.argv[1]
        newext = sys.argv[2]
        list_old_filenames = glob.glob("*%s*" % (oldext) )


elif len(sys.argv) > 3:
        for j in range( 1, len(sys.argv)):
                if (sys.argv[j] == "-old"):
                        oldext = sys.argv[j+1]
                elif (sys.argv[j] == "-new"):
                        newext = sys.argv[j+1]
                elif  (sys.argv[j] == "-files"):
                        string_files = sys.argv[j+1]
                        if ("*" in string_files) or ("?" in string_files):
                                print(string_files.strip("\""))
                                list_old_filenames = list(filter(lambda x: x.endswith(oldext), sorted(glob.glob(string_files.strip("\""))) ))
                        else:
                                list_old_filenames = list(filter(lambda x: x.endswith(oldext), string_files.replace(" ","").split(",")))

        
if not oldext.startswith("."):  oldext = "." + oldext
if not newext.startswith("."):  newext = "." + newext

list_new_filenames = [os.path.basename(f).split(oldext)[0] + newext for f in list_old_filenames]

if len(list_new_filenames) == 0:
        print("ERROR: No selected file has '%s' as its extension! Exiting..." % (oldext))
        exit()


lenght_max_old_filenames = int(max([len(x) for x in list_old_filenames] ))

print()
print("#"*62)
print("#" + " "*18 + "PSRALEX - %-20s" % (os.path.basename(sys.argv[0])) + " "*12 + "#")
print("#"*62)
print()


print("These files will be renamed as follows:")
print()
for i in range(len(list_old_filenames)):
   print("%-*s   --->   %-s " % (lenght_max_old_filenames, list_old_filenames[i], list_new_filenames[i]))


print()
if flag_force == 0:
        a = input("Proceed? (y/n): ")
elif flag_force == 1:
        a = "y"


if a == "y":
   for i in range(len(list_old_filenames)):
      os.rename( list_old_filenames[i], list_new_filenames[i])