react-native/packager/launchEditor.js

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/**
* Copyright (c) 2015-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*/
'use strict';
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var chalk = require('chalk');
var fs = require('fs');
var spawn = require('child_process').spawn;
function isTerminalEditor(editor) {
switch (editor) {
case 'vim':
case 'emacs':
case 'nano':
return true;
}
return false;
}
function getArgumentsForLineNumber(editor, fileName, lineNumber) {
switch (editor) {
case 'vim':
case 'mvim':
return [fileName, '+' + lineNumber];
case 'atom':
case 'subl':
case 'sublime':
return [fileName + ':' + lineNumber];
case 'joe':
case 'emacs':
return ['+' + lineNumber, fileName];
}
// For all others, drop the lineNumber until we have
// a mapping above, since providing the lineNumber incorrectly
// can result in errors or confusing behavior.
return [fileName];
}
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function printInstructions(title) {
console.log([
'',
chalk.bgBlue.white.bold(' ' + title + ' '),
' When you see Red Box with stack trace, you can click any ',
' stack frame to jump to the source file. The packager will launch your ',
' editor of choice. It will first look at REACT_EDITOR environment ',
' variable, then at EDITOR. To set it up, you can add something like ',
' REACT_EDITOR=atom to your .bashrc.',
''
].join('\n'));
}
var _childProcess = null;
function launchEditor(fileName, lineNumber) {
if (!fs.existsSync(fileName)) {
return;
}
var editor = process.env.REACT_EDITOR || process.env.EDITOR;
if (!editor) {
printInstructions('PRO TIP');
return;
}
var args = [fileName];
if (lineNumber) {
args = getArgumentsForLineNumber(editor, fileName, lineNumber);
}
console.log('Opening ' + chalk.underline(fileName) + ' with ' + chalk.bold(editor));
if (_childProcess && isTerminalEditor(editor)) {
// There's an existing editor process already and it's attached
// to the terminal, so go kill it. Otherwise two separate editor
// instances attach to the stdin/stdout which gets confusing.
_childProcess.kill('SIGKILL');
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}
_childProcess = spawn(editor, args, {stdio: 'inherit'});
_childProcess.on('exit', function(errorCode) {
_childProcess = null;
if (errorCode) {
console.log(chalk.red('Your editor exited with an error!'));
printInstructions('Keep these instructions in mind:');
}
});
_childProcess.on('error', function(error) {
console.log(chalk.red(error.message));
printInstructions('How to fix:');
})
}
module.exports = launchEditor;