vim Mac OS X install with gui-support

Building Vim on Mac OS X is a waste of time.

Step 1: Download the appropriate MacVim build from here.

Step 2: Put MacVim.app into the /Applications/ directory.

Step 3: Put the bundled mvim script somewhere in your PATH.

Done.

To run MacVim in your shell:

$ mvim -v filename

To run MacVim from your shell:

$ mvim filename

Building Vim with GUI on macOS using Homebrew:

1. brew edit vim.

2. Add a new line with option for GUI:

   option "enable-gui", "Enable GUI mode"
   

3. Change from no to yes in the following line:

   opts << "--enable-gui=no"
   

4. Install or re-install vim:

   brew reinstall vim --enable-gui
   

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Troubleshooting:

• If you've errors related to Python 3, see: vim's GH-2754.
• Checkout new Homebrew PR at GH-25785 with above patch.