Support EDITOR environment variable for multiple editors in F script

[Copilot]

The F script was hardcoded to open files in vim. Now respects the $EDITOR environment variable to support neovim, nano, pico, emacs, and VS Code.

Changes:

• Modified create_shortcut_cmd() to detect editor from $EDITOR with vim as fallback
• Added case statement handling editor-specific syntax:
  • vim/vi/nvim/neovim/nano/pico/emacs: +line filename
  • code: --goto filename:line
• Updated README to reflect multi-editor support

Example:

# Uses neovim
export EDITOR=nvim
./srg "search term"
F 1  # Opens match in neovim at correct line

# Uses VS Code
export EDITOR=code
./srg "search term"
F 1  # Opens match in VS Code with --goto syntax

Original prompt

Generalize the F script to work with more command line editors:

• neovim
• nano
• pico
• emacs
• code (Visual Studio Code)

Have the F script choose the editor based on the EDITOR environment variable.

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