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repl: add hint as to how to exit #20617

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repl: add hint as to how to exit #20617

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7b88a82
repl: add friendly tips about how to exit repl
monkingxue May 9, 2018
17e1272
style: fix the code style
monkingxue May 10, 2018
51282ef
fix: duplication of command name and variable name
monkingxue May 10, 2018
93c1647
fix: move the check of variables' name to before the command run
monkingxue May 11, 2018
de3385a
style
monkingxue May 18, 2018
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18 changes: 14 additions & 4 deletions lib/repl.js
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Original file line number Diff line number Diff line change
Expand Up @@ -215,9 +215,15 @@ function REPLServer(prompt,

function defaultEval(code, context, file, cb) {
var err, result, script, wrappedErr;
var isExitCommand = false;
var wrappedCmd = false;
var awaitPromise = false;
var input = code;
var trimmedCommand = code.trim();

if (trimmedCommand === 'exit' || trimmedCommand === 'quit') {
isExitCommand = true;
}

if (/^\s*\{/.test(code) && /\}\s*$/.test(code)) {
// It's confusing for `{ a : 1 }` to be interpreted as a block
Expand Down Expand Up @@ -313,10 +319,16 @@ function REPLServer(prompt,
breakOnSigint: self.breakEvalOnSigint
};

const localContext = self.useGlobal ? global : self.context;
if (isExitCommand && !localContext.hasOwnProperty(trimmedCommand)) {
self.outputStream.write('(To exit, press ^D or type .exit)\n');
return self.displayPrompt();
}

if (self.useGlobal) {
result = script.runInThisContext(scriptOptions);
} else {
result = script.runInContext(context, scriptOptions);
result = script.runInContext(localContext, scriptOptions);
}
} finally {
if (self.breakEvalOnSigint) {
Expand All @@ -332,12 +344,10 @@ function REPLServer(prompt,
}
} catch (e) {
err = e;

if (err && err.code === 'ERR_SCRIPT_EXECUTION_INTERRUPTED') {
// The stack trace for this case is not very useful anyway.
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Nit: this is a unrelated change and I think the comment is better the way it was before.

// The stack trace for this case is not very useful anyway.
Object.defineProperty(err, 'stack', { value: '' });
}

if (process.domain) {
debug('not recoverable, send to domain');
process.domain.emit('error', err);
Expand Down
24 changes: 24 additions & 0 deletions test/parallel/test-repl.js
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Original file line number Diff line number Diff line change
Expand Up @@ -132,6 +132,29 @@ const strictModeTests = [
}
];

const friendlyExitTests = [
{
send: 'exit',
expect: '(To exit, press ^D or type .exit)'
},
{
send: 'quit',
expect: '(To exit, press ^D or type .exit)'
},
{
send: 'quit = 1',
expect: '1'
},
{
send: 'quit',
expect: '1'
},
{
send: 'exit',
expect: '(To exit, press ^D or type .exit)'
},
];

const errorTests = [
// Uncaught error throws and prints out
{
Expand Down Expand Up @@ -742,6 +765,7 @@ const tcpTests = [
const [ socket, replServer ] = await startUnixRepl();

await runReplTests(socket, prompt_unix, unixTests);
await runReplTests(socket, prompt_unix, friendlyExitTests);
await runReplTests(socket, prompt_unix, errorTests);
replServer.replMode = repl.REPL_MODE_STRICT;
await runReplTests(socket, prompt_unix, strictModeTests);
Expand Down