MacOS Quick Action File Diff code with options for VSCode FileMerge and Terminal Diff

gistfile1.txt

#!/bin/bash

# We expect exactly two files
if [ $# -ne 2 ]; then
  osascript -e 'display alert "Please select exactly two files." as critical'
  exit 1
fi

# Use osascript to show a choice dialog (AppleScript).
CHOICE="$(osascript <<EOT
set userChoice to choose from list {"VSCode Diff", "FileMerge", "Terminal Diff"} ¬
  with prompt "Select a diff method:" ¬
  without empty selection allowed

if userChoice is false then
  return "Canceled"
else
  return item 1 of userChoice
end if
EOT
)"

if [ "$CHOICE" = "Canceled" ]; then
  exit 0
fi

# Decide how to diff based on the user's choice
case "$CHOICE" in

  "VSCode Diff")
    # Assumes 'code' is on PATH. If not, use the full path, e.g.:
    # /Applications/Visual\ Studio\ Code.app/Contents/Resources/app/bin/code -d ...
    code -d "$1" "$2"
    ;;

  "FileMerge")
    # Adjust path if needed; this is the usual location for Xcode’s FileMerge:
    /usr/bin/opendiff "$1" "$2"
    ;;

  "Terminal Diff")
    # We'll do a unified diff and open the result in TextEdit
    diff -u "$1" "$2" | open -f -a TextEdit
    ;;

  *)
    echo "Unknown choice: $CHOICE"
    exit 1
    ;;
esac