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Implement isTTY property on FakeStream #8

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Implement isTTY property on FakeStream #8

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18 changes: 14 additions & 4 deletions command.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,7 @@ import {Chunk, ChunkType} from './chunk';
import {PassThrough, Readable, Transform, TransformOptions, Writable} from 'stream';
import {EventEmitter} from 'events';
import * as fs from 'fs';
import * as tty from 'tty';

export interface Ref {
ref(): void
Expand All @@ -16,16 +17,25 @@ export interface CommandContext {

// get-stdin maintains reference to process.stdin, so it must be replaced with a permemant value
class FakeStream extends PassThrough {
constructor(private readonly options?: TransformOptions) {
constructor(private readonly fd: number, private readonly options?: TransformOptions) {
super(options);
}

reset() {
this.removeAllListeners();
PassThrough.call(this, this.options);
}

get isTTY(): boolean {
return +(process.env[`NAILGUN_TTY_${this.fd}`] as any) > 0;
}
}

// @ts-ignore
FakeStream.prototype.getColorDepth = tty.WriteStream.prototype.getColorDepth;
// @ts-ignore
FakeStream.prototype.hasColors = tty.WriteStream.prototype.hasColors;

export namespace real {
export const stderrWrite = process.stderr.write.bind(process.stderr);
export const stdoutWrite = process.stdout.write.bind(process.stdout);
Expand Down Expand Up @@ -54,12 +64,12 @@ function install() {
Object.defineProperty(process, 'stderr', {
configurable: true,
enumerable: true,
get: (stderr => () => stderr)(new FakeStream),
get: (stderr => () => stderr)(new FakeStream(2)),
});
Object.defineProperty(process, 'stdout', {
configurable: true,
enumerable: true,
get: (stdout => () => stdout)(new FakeStream),
get: (stdout => () => stdout)(new FakeStream(1)),
});

process.stderr.write = function() {
Expand All @@ -75,7 +85,7 @@ function install() {
Object.defineProperty(process, 'stdin', {
configurable: true,
enumerable: true,
get: (stdin => () => stdin)(new FakeStream),
get: (stdin => () => stdin)(new FakeStream(0)),
});
}

Expand Down