all functionality done

.gitignore

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+__pycache__

indenter.py

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+#!/usr/bin/python
+import re
+import argparse
+import functools
+leading_whitespace = re.compile(r'^( +)(?! )')
+#@functools.lru_cache(maxsize=None)
+def get_whitespaces_re(line):
+    return leading_whitespace.match(line)
+def get_indent_frequency(lines):
+    lens = sorted(match.span()[1] for match in filter(bool,map(get_whitespaces_re,lines)))
+    freq = {}
+    for i in range(len(lens)-1):
+        p = lens[i]
+        n = lens[i+1]
+        diff = n - p
+        if diff > 0:
+            new_val = freq.get(diff,0) + 1
+            freq[diff] = new_val
+    return freq
+def get_best_canitdate(lines):
+    freqs = get_indent_frequency(lines)
+    if freqs:
+        return sorted(freqs.keys(),key = lambda k: freqs[k],reverse=True)[0]
+def change_all(text,new_indent):
+    lines = text.split('\n')
+    i = get_best_canitdate(lines)
+    for row,line in enumerate(lines):
+        prev_whitespaces = get_whitespaces_re(line)
+        if prev_whitespaces is not None:
+            prev_len = prev_whitespaces.span()[1]
+            n,remaining = divmod(prev_len,i)
+            if remaining*2 >= i:
+                n += 1
+            stripped = line.lstrip(' ')
+            lines[row]  = ' '*(new_indent*n) + stripped
+    return '\n'.join(lines)
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser()
+    parser.add_argument('-o',help='output file')
+    parser.add_argument('file')
+    parser.add_argument('indent',type=int)
+    args = parser.parse_args()
+    with open(args.file) as file:
+        text = file.read()
+    new = change_all(text,args.indent)
+    if args.o:
+        with open(args.o,'w') as file:
+            file.write(new)
+    else:
+        with open(args.file,'w') as file:
+            file.write(new)