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/**
* @license
* Copyright 2025 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
import { execSync, spawn } from 'child_process';
type EditorType = 'vscode' | 'vim';
interface DiffCommand {
command: string;
args: string[];
}
export function checkHasEditor(editor: EditorType): boolean {
const commandExists = (cmd: string): boolean => {
try {
execSync(`which ${cmd}`, { stdio: 'ignore' });
return true;
} catch {
return false;
}
};
if (editor === 'vscode') {
return commandExists('code');
} else if (editor === 'vim') {
return commandExists('vim');
}
return false;
}
/**
* Get the diff command for a specific editor.
*/
export function getDiffCommand(
oldPath: string,
newPath: string,
editor: EditorType,
): DiffCommand | null {
switch (editor) {
case 'vscode':
return {
command: 'code',
args: ['--wait', '--diff', oldPath, newPath],
};
case 'vim':
return {
command: 'vim',
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,
],
};
default:
return null;
}
}
/**
* Opens a diff tool to compare two files.
* Terminal-based editors by default blocks parent process until the editor exits.
* GUI-based editors requires args such as "--wait" to block parent process.
*/
export async function openDiff(
oldPath: string,
newPath: string,
editor: EditorType,
): Promise<void> {
const diffCommand = getDiffCommand(oldPath, newPath, editor);
if (!diffCommand) {
console.error('No diff tool available. Install vim or vscode.');
return;
}
try {
if (editor === 'vscode') {
// Use spawn to avoid blocking the entire process, resolve this function when editor is closed.
return new Promise((resolve, reject) => {
const process = spawn(diffCommand.command, diffCommand.args, {
stdio: 'inherit',
});
process.on('close', (code) => {
if (code === 0) {
resolve();
} else {
reject(new Error(`VS Code exited with code ${code}`));
}
});
process.on('error', (error) => {
reject(error);
});
});
} else {
// Use execSync for terminal-based editors like vim
const command = `${diffCommand.command} ${diffCommand.args.map((arg) => `"${arg}"`).join(' ')}`;
execSync(command, {
stdio: 'inherit',
encoding: 'utf8',
});
}
} catch (error) {
console.error(error);
}
}
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