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Mini Shell
Mini Shell
// Flags: --expose-internals --no-warnings
'use strict';
const common = require('../common');
const assert = require('assert');
const { WriteStream } = require('tty');
const { internalBinding } = require('internal/test/binding');
const { TTY } = internalBinding('tty_wrap');
const getWindowSize = TTY.prototype.getWindowSize;
function monkeyPatchGetWindowSize(fn) {
TTY.prototype.getWindowSize = function() {
TTY.prototype.getWindowSize = getWindowSize;
return fn.apply(this, arguments);
};
}
{
// tty.WriteStream constructor does not define columns and rows if an error
// occurs while retrieving the window size from the handle.
monkeyPatchGetWindowSize(function() {
return -1;
});
const stream = WriteStream(1);
assert(stream instanceof WriteStream);
assert.strictEqual(stream.columns, undefined);
assert.strictEqual(stream.rows, undefined);
}
{
// _refreshSize() emits an error if an error occurs while retrieving the
// window size from the handle.
const stream = WriteStream(1);
stream.on('error', common.mustCall((err) => {
assert.strictEqual(err.syscall, 'getWindowSize');
}));
monkeyPatchGetWindowSize(function() {
return -1;
});
stream._refreshSize();
}
{
// _refreshSize() emits a 'resize' event when the window size changes.
monkeyPatchGetWindowSize(function(size) {
size[0] = 80;
size[1] = 24;
return 0;
});
const stream = WriteStream(1);
stream.on('resize', common.mustCall(() => {
assert.strictEqual(stream.columns, 82);
assert.strictEqual(stream.rows, 26);
}));
assert.strictEqual(stream.columns, 80);
assert.strictEqual(stream.rows, 24);
monkeyPatchGetWindowSize(function(size) {
size[0] = 82;
size[1] = 26;
return 0;
});
stream._refreshSize();
}
{
// WriteStream.prototype.getWindowSize() returns the current columns and rows.
monkeyPatchGetWindowSize(function(size) {
size[0] = 99;
size[1] = 32;
return 0;
});
const stream = WriteStream(1);
assert.strictEqual(stream.columns, 99);
assert.strictEqual(stream.rows, 32);
assert.deepStrictEqual(stream.getWindowSize(), [99, 32]);
}
Zerion Mini Shell 1.0