Fix issues

README.md

@@ -1,9 +1,25 @@
 # subprompt
-Substitute every match of a regex in multiple files - with confirmation prompts. Usage:
-```
-subprompt [REGEX] [SUB] [FILES...]
-```
-Install it through PyPi:
+Interactively change every line matching a regex in multiple files.
+
+## Installation
+Through PyPI:
 ```
 python3.9 -m pip install subprompt
 ```
+
+## Usage
+```
+usage: subprompt.py [-h] (-d | -r R) [-n N] REGEX FILES [FILES ...]
+
+Modifies lines matched by a regex interactively
+
+positional arguments:
+  REGEX
+  FILES
+
+optional arguments:
+  -h, --help  show this help message and exit
+  -d          delete line
+  -r R        replace match with expression
+  -n N        size of lines preview (default=3)
+```

setup.cfg

@@ -1,6 +1,6 @@
 [metadata]
 name = subprompt
-version = 0.0.5
+version = 0.0.6
 author = Augusto Lenz Gunsch
 author_email = augusto@augustogunsch.com
 description = Substitute Regex in files with prompt confirmation

src/subprompt/subprompt.py

@@ -41,13 +41,13 @@ class Filter:
         self.regex = re.compile(args.regex)
         self.sub = args.r
         self.delete = args.d
-        self.spread = args.n
+        self.spread = args.n+1
 
         self.lines_to_delete = []
 
     def _number_lines(_, lines, start_n):
         return [Fore.YELLOW + Style.BRIGHT +
-                str(n + start_n) +
+                str(n + start_n + 1) +
                 Fore.RESET + Style.RESET_ALL +
                 ':' + line
                 for (n, line) in enumerate(lines)]
@@ -74,33 +74,34 @@ class Filter:
             return replaced_match
 
         start_n = max(0, line_n - self.spread)
-        end_n = min(len(lines), line_n + self.spread)
+        end_n = min(len(lines)+1, line_n + self.spread)
+        rel_line_n = line_n-start_n
         cut = lines[start_n:end_n]
 
         highlighted = line.replace(curr_match,
                 Back.RED + curr_match + Back.RESET)
 
         cut_highlighted = cut
-        cut_highlighted[line_n] = highlighted
+        cut_highlighted[rel_line_n] = highlighted
         cut_highlighted = self._number_lines(cut_highlighted, start_n)
 
         cut_replaced = cut
 
         if not self.delete:
-            cut_replaced[line_n] = line.replace(curr_match,
+            cut_replaced[rel_line_n] = line.replace(curr_match,
                     Back.YELLOW + Fore.BLACK + replaced_match + Back.RESET + Fore.RESET)
         else:
-            cut_replaced.pop(line_n)
+            cut_replaced.pop(rel_line_n)
 
         cut_replaced = self._number_lines(cut_replaced, start_n)
 
         print(Fore.GREEN + Style.BRIGHT + fname)
 
-        print('\n'.join(cut_highlighted))
+        print(''.join(cut_highlighted))
         print('Becomes the following:')
-        print('\n'.join(cut_replaced))
-
         print()
+        print(''.join(cut_replaced))
+
 
         while True:
             answer = input('Confirm the change? [Y/n/a/q] ').lower()
@@ -135,7 +136,7 @@ class Filter:
         with open(fname, 'r') as file:
             contents = file.read()
 
-        lines = contents.splitlines()
+        lines = contents.splitlines(keepends=True)
 
         lines = [
                     self.regex.sub(
@@ -145,10 +146,13 @@ class Filter:
                     for (line_n, line) in enumerate(lines)
                 ]
 
+        if self.delete:
             for line in reversed(self.lines_to_delete):
                 lines.pop(line)
 
-        new_contents = '\n'.join(lines)
+            self.lines_to_delete = []
+
+        new_contents = ''.join(lines)
 
         hash_old = hashlib.md5(contents.encode())
         hash_new = hashlib.md5(new_contents.encode())
@@ -165,7 +169,7 @@ def run(args):
     action.add_argument('-d', help='delete line', action='store_true')
     action.add_argument('-r', help='replace match with expression', type=str)
     parser.add_argument('files', metavar='FILES', nargs='+', type=str)
-    parser.add_argument('-n', help='size lines preview (default=3)', type=int, default=3)
+    parser.add_argument('-n', help='size of lines preview (default=3)', type=int, default=3)
 
     args = parser.parse_args(args)