Function getDiffCommand

packages/core/src/utils/editor.ts:98–157

(
  oldPath: string,
  newPath: string,
  editor: EditorType,
)

 * Get the diff command for a specific editor.
 */
export function getDiffCommand(
  oldPath: string,
  newPath: string,
  editor: EditorType,
): DiffCommand | null {
  if (!isValidEditorType(editor)) {
    return null;
  }
  const commandConfig = editorCommands[editor];
  const commands =
    process.platform === 'win32' ? commandConfig.win32 : commandConfig.default;
  const command =
    commands.slice(0, -1).find((cmd) => commandExists(cmd)) ||
    commands[commands.length - 1];

  switch (editor) {
    case 'vscode':
    case 'vscodium':
    case 'windsurf':
    case 'cursor':
    case 'zed':
      return { command, args: ['--wait', '--diff', oldPath, newPath] };
    case 'vim':
    case 'neovim':
      return {
        command,
        args: [
          '-d',
          // skip viminfo file to avoid E138 errors
          '-i',
          'NONE',
          // make the left window read-only and the right window editable
          '-c',
          'wincmd h | set readonly | wincmd l',
          // set up colors for diffs
          '-c',
          'highlight DiffAdd cterm=bold ctermbg=22 guibg=#005f00 | highlight DiffChange cterm=bold ctermbg=24 guibg=#005f87 | highlight DiffText ctermbg=21 guibg=#0000af | highlight DiffDelete ctermbg=52 guibg=#5f0000',
          // Show helpful messages
          '-c',
          'set showtabline=2 | set tabline=[Instructions]\\ :wqa(save\\ &\\ quit)\\ \\|\\ i/esc(toggle\\ edit\\ mode)',
          '-c',
          'wincmd h | setlocal statusline=OLD\\ FILE',
          '-c',
          'wincmd l | setlocal statusline=%#StatusBold#NEW\\ FILE\\ :wqa(save\\ &\\ quit)\\ \\|\\ i/esc(toggle\\ edit\\ mode)',
          // Auto close all windows when one is closed
          '-c',
          'autocmd WinClosed * wqa',
          oldPath,
          newPath,
        ],
      };
    case 'emacs':
      return {
        command: 'emacs',
        args: ['--eval', `(ediff "${oldPath}" "${newPath}")`],
      };
    default:
      return null;