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'use strict';
const { Interface } = require('readline');
const path = require('path');
const fs = require('fs');
const os = require('os');
const util = require('util');
const debug = util.debuglog('repl');
// XXX(chrisdickinson): The 15ms debounce value is somewhat arbitrary.
// The debounce is to guard against code pasted into the REPL.
const kDebounceHistoryMS = 15;
module.exports = setupHistory;
function _writeToOutput(repl, message) {
repl._writeToOutput(message);
repl._refreshLine();
}
function setupHistory(repl, historyPath, ready) {
// Empty string disables persistent history
if (typeof historyPath === 'string')
historyPath = historyPath.trim();
if (historyPath === '') {
repl._historyPrev = _replHistoryMessage;
return ready(null, repl);
}
if (!historyPath) {
try {
historyPath = path.join(os.homedir(), '.node_repl_history');
} catch (err) {
_writeToOutput(repl, '\nError: Could not get the home directory.\n' +
'REPL session history will not be persisted.\n');
debug(err.stack);
repl._historyPrev = _replHistoryMessage;
return ready(null, repl);
}
}
var timer = null;
var writing = false;
var pending = false;
repl.pause();
// History files are conventionally not readable by others:
// https://github.com/nodejs/node/issues/3392
// https://github.com/nodejs/node/pull/3394
fs.open(historyPath, 'a+', 0o0600, oninit);
function oninit(err, hnd) {
if (err) {
// Cannot open history file.
// Don't crash, just don't persist history.
_writeToOutput(repl, '\nError: Could not open history file.\n' +
'REPL session history will not be persisted.\n');
debug(err.stack);
repl._historyPrev = _replHistoryMessage;
repl.resume();
return ready(null, repl);
}
fs.close(hnd, onclose);
}
function onclose(err) {
if (err) {
return ready(err);
}
fs.readFile(historyPath, 'utf8', onread);
}
function onread(err, data) {
if (err) {
return ready(err);
}
if (data) {
repl.history = data.split(/[\n\r]+/, repl.historySize);
} else {
repl.history = [];
}
fs.open(historyPath, 'r+', onhandle);
}
function onhandle(err, hnd) {
if (err) {
return ready(err);
}
fs.ftruncate(hnd, 0, (err) => {
repl._historyHandle = hnd;
repl.on('line', online);
// Reading the file data out erases it
repl.once('flushHistory', function() {
repl.resume();
ready(null, repl);
});
flushHistory();
});
}
// ------ history listeners ------
function online(line) {
repl._flushing = true;
if (timer) {
clearTimeout(timer);
}
timer = setTimeout(flushHistory, kDebounceHistoryMS);
}
function flushHistory() {
timer = null;
if (writing) {
pending = true;
return;
}
writing = true;
const historyData = repl.history.join(os.EOL);
fs.write(repl._historyHandle, historyData, 0, 'utf8', onwritten);
}
function onwritten(err, data) {
writing = false;
if (pending) {
pending = false;
online();
} else {
repl._flushing = Boolean(timer);
if (!repl._flushing) {
repl.emit('flushHistory');
}
}
}
}
function _replHistoryMessage() {
if (this.history.length === 0) {
_writeToOutput(
this,
'\nPersistent history support disabled. ' +
'Set the NODE_REPL_HISTORY environment\nvariable to ' +
'a valid, user-writable path to enable.\n'
);
}
this._historyPrev = Interface.prototype._historyPrev;
return this._historyPrev();
}
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