Use shlex to split custom vim command

This allows to include spaces in vim command
Add example to change default diff algorithm
Move to first line on each file

README.md

@@ -3,6 +3,7 @@ Do you use `git difftool` to review changes before making a commit? The problem
 
 # Install
 
+```bash
     mkdir -p ~/bin
 
     # for python version >= 3.10
@@ -12,6 +13,7 @@ Do you use `git difftool` to review changes before making a commit? The problem
     curl -o ~/bin/vimtabdiff.py "https://raw.githubusercontent.com/balki/vimtabdiff/py38/vimtabdiff.py"
 
     chmod +x ~/bin/vimtabdiff.py
+```
 
 You may need to add `~/bin` to your PATH variable if not already done. See [here](https://wiki.archlinux.org/title/Environment_variables#Per_user) for help.
 👍 this [issue](https://github.com/balki/vimtabdiff/issues/1) for `pip install` support 
@@ -69,6 +71,7 @@ You may need to add `~/bin` to your PATH variable if not already done. See [here
 
 ## Using custom vim command
 
+Using clean vim without reading `vimrc`
 ```bash
     git config --global difftool.vimtabdiff.cmd 'vimtabdiff.py --vim "vim --clean" $LOCAL $REMOTE'
 ```
@@ -82,16 +85,14 @@ Git config file (`~/.gitconfig`) should look like this
     [difftool "vimtabdiff"]
             cmd = vimtabdiff.py --vim \"vim --clean\" $LOCAL $REMOTE
 ```
+Using better diff algorithm
 
+```bash
+    git config --global difftool.vimtabdiff.cmd 'vimtabdiff.py --vim "vim +\"set diffopt+=algorithm:patience\"" $LOCAL $REMOTE'
 
-# Known issues
+```
 
-  1. If your path to vim has a space, it does not work, i.e. Following does **not** work
-
-      ```bash
-      git config difftool.vimtabdiff.cmd 'vimtabdiff.py --vim "/home/foo/my program files/bin/vim" $LOCAL $REMOTE'
-      ```
-  2. Not tested in non-linux OS. Pull requests welcome if found any issues but hopefully should work fine.
+*Note:* Not tested in non-linux OS. But I guess it should work fine. Pull requests welcome if found any issues.
 
 # Similar
 

vimtabdiff.py

@@ -9,6 +9,7 @@ import argparse
 import itertools
 import tempfile
 import subprocess
+import shlex
 from pathlib import Path
 from typing import Callable, TypeVar
 from collections.abc import Iterator, Sequence
@@ -77,14 +78,15 @@ def main() -> None:
             aPath = a.resolve() if a else os.devnull
             bPath = b.resolve() if b else os.devnull
             print(
-                f"tabedit {aPath} | diffthis | vsp {bPath} | diffthis | diffupdate",
+                f"tabedit {aPath} | vsp {bPath} | windo diffthis | windo diffupdate",
                 file=vimCmdFile)
         cmds = f"""
+        tabdo windo :1
         tabfirst | tabclose
         call delete("{vimCmdFile.name}")
         """
         print(cmds, file=vimCmdFile)
-    subprocess.run(args.vim.split() + ["-S", vimCmdFile.name])
+    subprocess.run(shlex.split(args.vim) + ["-S", vimCmdFile.name])
 
 
 if __name__ == '__main__':