add feature to remove characters from start or end of filename

README.md

@@ -22,6 +22,8 @@ optional arguments:
                         prefix filename with prefix string
   -B string, --postfix string
                         postfix filename with postfix string
+  -C int, --remove int  remove characters from start or end of filename (+ve
+                        for start, -ve for end)
   -r string, --rename string
                         replace filename with string
   -n, --dryrun          perform a dry run (will not run any actions)

py_rename.py

@@ -90,6 +90,25 @@ def postfix_it(self, postfix_str):
         new_name = old_name + postfix_str
         self._rename(new_name)
 
+    def remove_it(self,n_chars):
+        """Remove characters from the start or end of filename
+
+        :n_chars: int, number of characters to remove. +ve from start, -ve from end
+        :returns: None
+        """
+        old_name = self.fname
+        length = len(old_name)
+        if abs(n_chars) >= length:
+            self._print(
+                "Failed to rename {old} : {err}".
+                format(old=self.full_name, err="Number of characters equals or exceeds length of filename"))
+        elif n_chars >= 0:
+            new_name = old_name[n_chars::]
+            self._rename(new_name)
+        else:
+            new_name = old_name[0:n_chars]
+            self._rename(new_name)
+
     def lower_it(self):
         """Lowercase the filename
         :returns: None
@@ -152,6 +171,15 @@ def rename(self, rename_string):
             action='store',
             help="postfix filename with postfix string"
             )
+    parser.add_argument(
+            '-C',
+            '--remove',
+            dest='remove',
+            type=int,
+            metavar='int',
+            action='store',
+            help="remove characters from start or end of filename (+ve for start, -ve for end)"
+            )
     parser.add_argument(
             '-r',
             '--rename',
@@ -205,6 +233,8 @@ def rename(self, rename_string):
         rename_it.prefix_it(args.prefix)
     if args.postfix:
         rename_it.postfix_it(args.postfix)
+    if args.remove:
+        rename_it.remove_it(args.remove)
     if args.lower:
         rename_it.lower_it()
     if args.remove_space: