repl: add friendly tips about how to exit repl

Imitate python repl, when the user enters 'exit' or 'quit',
no longer prompt 'Reference Error', but
prompts 'To exit, press ^D or type .exit'.
If the user defines variables named 'exit' or 'quit' ,
only the value of the variables are output

PR-URL: https://github.com/nodejs/node/pull/20617
Fixes: https://github.com/nodejs/node/issues/19021
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
This commit is contained in:
monkingxue 2018-05-09 10:34:57 +08:00 committed by Ruben Bridgewater
parent 9deca876bb
commit 9aa4ec43fc
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2 changed files with 38 additions and 4 deletions

View File

@ -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
@ -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) {
@ -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.
// 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);

View File

@ -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
{
@ -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);