commit 6f067fe938060291803084484388f062f032dbae
Author: Augusto Gunsch <augusto@augustogunsch.com>
Date:   Fri Nov 11 18:52:44 2022 +0100

    Initial commit

diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..4ae7986
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1 @@
+colorama==0.4.3
diff --git a/sub.py b/sub.py
new file mode 100755
index 0000000..430a806
--- /dev/null
+++ b/sub.py
@@ -0,0 +1,116 @@
+#!/bin/python3.9
+import re
+import hashlib
+import os
+from sys import argv, stderr
+from os.path import basename
+from colorama import init, Fore, Back, Style
+
+init(autoreset=True)
+
+if len(argv) <= 3:
+    print('usage: {0} [REGEX] [SUB] [FILES...]'.format(basename(__file__)), file=stderr)
+    exit(1)
+
+regex = argv[1]
+sub = argv[2]
+files = argv[3:]
+replace_all = False
+quit_loop = False
+sub_count = 0
+match_count = 0
+
+def prompt(matchobj, line, line_n, file):
+    global replace_all
+    global quit_loop
+    global sub_count
+    global match_count
+
+    if quit_loop:
+        return matchobj.group(0)
+
+
+    replaced_match = re.sub(regex, sub, matchobj.group(0))
+
+    if replaced_match == matchobj.group(0):
+        return replaced_match
+
+    match_count += 1
+
+    if replace_all:
+        sub_count += 1
+        return replaced_match
+
+    highlighted = line.replace(matchobj.group(0),
+            Back.RED + matchobj.group(0) + Back.RESET)
+    replaced = line.replace(matchobj.group(0),
+            Back.YELLOW + Fore.BLACK + replaced_match + Back.RESET + Fore.RESET)
+
+    print(Fore.GREEN + Style.BRIGHT + file)
+
+    print(Fore.YELLOW + Style.BRIGHT + str(line_n), end='')
+    print(':{0}'.format(highlighted))
+
+    print('Becomes the following:')
+
+    print(Fore.YELLOW + Style.BRIGHT + str(line_n), end='')
+    print(':{0}'.format(replaced))
+
+    print()
+
+    while True:
+        answer = input('Confirm the change? [Y/n/a/q] ').lower()
+
+        if answer in ['y', 'yes', '']:
+            sub_count += 1
+            print()
+            return replaced_match
+        elif answer in ['n', 'no']:
+            print()
+            return matchobj.group(0)
+        elif answer in ['a', 'all']:
+            sub_count += 1
+            replace_all = True
+            return replaced_match
+        elif answer in ['q', 'quit']:
+            quit_loop = True
+            return matchobj.group(0)
+
+        print('Invalid answer. Please type again.')
+
+def filter_file(fname):
+    with open(fname, 'r') as file:
+        contents = file.read()
+
+    lines = contents.splitlines()
+
+    lines = [
+            re.sub(regex,
+                lambda matchobj: prompt(matchobj, line, line_n, fname),
+                line)
+            for (line_n, line) in enumerate(lines)
+            ]
+
+    new_contents = '\n'.join(lines)
+
+    hash_old = hashlib.md5(contents.encode())
+    hash_new = hashlib.md5(new_contents.encode())
+
+    if hash_old.digest() != hash_new.digest():
+        with open(fname, 'w') as file:
+            file.write(new_contents)
+            file.write('\n')
+
+for file in files:
+    if os.access(file, os.W_OK):
+        filter_file(file)
+
+        if quit_loop:
+            break
+
+if match_count == 0:
+    print(Fore.RED + Style.BRIGHT + 'No matches found.')
+else:
+    print(Fore.YELLOW + Style.BRIGHT + 'Made {0} of {1} substitutions.'.
+            format(Fore.WHITE + str(sub_count) + Fore.YELLOW,
+                Fore.WHITE + str(match_count) + Fore.YELLOW))