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'use strict';
const spawn = require('child_process').spawn;
const CLI =
process.env.USE_EMBEDDED_NODE_INSPECT === '1' ?
'inspect' :
require.resolve('../../cli.js');
function startCLI(args) {
const child = spawn(process.execPath, [CLI, ...args]);
let isFirstStdoutChunk = true;
const outputBuffer = [];
function bufferOutput(chunk) {
if (isFirstStdoutChunk) {
isFirstStdoutChunk = false;
outputBuffer.push(chunk.replace(/^debug>\s*/, ''));
} else {
outputBuffer.push(chunk);
}
}
function getOutput() {
return outputBuffer.join('').toString()
.replace(/^[^\n]*?[\b]/mg, '');
}
child.stdout.setEncoding('utf8');
child.stdout.on('data', bufferOutput);
child.stderr.setEncoding('utf8');
child.stderr.on('data', bufferOutput);
if (process.env.VERBOSE === '1') {
child.stdout.pipe(process.stderr);
child.stderr.pipe(process.stderr);
}
return {
flushOutput() {
const output = this.output;
outputBuffer.length = 0;
return output;
},
waitFor(pattern, timeout = 2000) {
function checkPattern(str) {
if (Array.isArray(pattern)) {
return pattern.every((p) => p.test(str));
}
return pattern.test(str);
}
return new Promise((resolve, reject) => {
function checkOutput() {
if (checkPattern(getOutput())) {
tearDown(); // eslint-disable-line no-use-before-define
resolve();
}
}
function onChildExit() {
tearDown(); // eslint-disable-line no-use-before-define
reject(new Error(
`Child quit while waiting for ${pattern}; found: ${this.output}`));
}
const timer = setTimeout(() => {
tearDown(); // eslint-disable-line no-use-before-define
reject(new Error([
`Timeout (${timeout}) while waiting for ${pattern}`,
`found: ${this.output}`,
].join('; ')));
}, timeout);
function tearDown() {
clearTimeout(timer);
child.stdout.removeListener('data', checkOutput);
child.removeListener('exit', onChildExit);
}
child.on('exit', onChildExit);
child.stdout.on('data', checkOutput);
checkOutput();
});
},
waitForPrompt(timeout = 2000) {
return this.waitFor(/>\s+$/, timeout);
},
ctrlC() {
return this.command('.interrupt');
},
get output() {
return getOutput();
},
get rawOutput() {
return outputBuffer.join('').toString();
},
parseSourceLines() {
return getOutput().split('\n')
.map((line) => line.match(/(?:\*|>)?\s*(\d+)/))
.filter((match) => match !== null)
.map((match) => +match[1]);
},
command(input) {
this.flushOutput();
child.stdin.write(input);
child.stdin.write('\n');
return this.waitForPrompt();
},
stepCommand(input) {
this.flushOutput();
child.stdin.write(input);
child.stdin.write('\n');
return this
.waitFor(
/(?:assert|break|debugCommand|exception|other|promiseRejection) in/
)
.then(() => this.waitForPrompt());
},
quit() {
return new Promise((resolve) => {
child.stdin.end();
child.on('exit', resolve);
});
},
};
}
module.exports = startCLI;
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