added line numbering to view

README.md

@@ -157,7 +157,7 @@ A simple line-oriented text editor and page-oriented text viewer for MicroPython
 Exports the following functions:
 
 - `edit(filename)`: start an `ed`-like text editor (see below)
-- `view(filename)`: start a `more`-like pager for viewing a text file
+- `view(filename, lno=False)`: start a `more`-like pager for viewing a text file (pass an additional parameter to view it with line numbers)
 
 The editor mode supports the following subset of POSIX ed commands in the standard `[range][command][param]` syntax:
 

app/ed.py

@@ -105,7 +105,7 @@ class Ed:
           end = min(len(self.buffer), end)
           for i in range(start - 1, end):
             if cmd_char == 'n':
-              print(f"{i + 1}\t{self.buffer[i]}")
+              print(f"{(i+1):<5} {self.buffer[i]}")
             else:
               print(self.buffer[i])
           self.current_line = end
@@ -201,10 +201,15 @@ def edit(fname):
   editor = Ed(fname)
   editor.run()
 
-def view(fname):
+def view(fname, lno=False):
   try:
     with open(fname, 'r') as f:
       text = f.read()
+      if lno:
+        buf = text.split('\n')
+        for i in range(0, len(buf) - 1):
+          buf[i] = f'{(i+1):<5} {buf[i]}'
+        text = '\n'.join(buf)
       print_paged(text)
   except:
     print('Error opening the input file!')