util: add colorText method #43371

hemanth · 2022-06-10T16:54:55Z

This is with reference to the comment in #42770

A few things to finalize before completing this draft PR:

Are we Ok to have such a method?
Given that is it CLI only the name sounds fine?
Can it be part of the console API?

//cc @nodejs/util

test/parallel/test-util-colorText.js

lib/util.js

ljharb · 2022-06-10T18:03:51Z

Name sounds good to me; i don't think it should be in console at all.

Is there any way to have tests that actually verify that the expected colors show up on supported platforms?

cjihrig

Left some preliminary comments.

Is there any way to have tests that actually verify that the expected colors show up on supported platforms?

test/parallel/test-util-format.js and test/parallel/test-util-inspect.js might be good places to look for examples.

Also cc @BridgeAR who might be interested since this overlaps with the color support in util.inspect().

lib/util.js

cjihrig · 2022-06-11T18:32:53Z

lib/util.js

+ function colorText(format, text) {
+  validateString(format, 'format');
+  validateString(text, 'text');
+  const formatCodes = inspect.colors[format];


If this is going to be public API, we should probably provide some additional validation for supported formats.

additional validation

like?

I was thinking we could validate that format is actually something supported by inspect.colors, but feel free to ignore if you want.

If they pass anything apart as of now, we are just returning the text as in, do you feel it makes sense to check if the format is supported by inspect.colors and throw an error for non-supported inputs?

Yes, that's what I originally meant.

Is inspect.colors mutable and exposed to users?

lib/util.js

test/parallel/test-util-colorText.js

Trott · 2022-06-13T21:21:00Z

Micro-nit on the commit message: The verb in the first line of the commit message should be imperative. In other words, add rather than adding. This is something that someone can fix when landing, and also no one (not even me) is actually going to care if it slips through as adding rather than add. But if you want to make that change, that would make it comply with our contributor guidelines doc.

hemanth · 2022-06-13T22:11:23Z

Thanks for the clarification @Trott. I had that doubt, fixed it.

nodejs-github-bot · 2022-06-14T19:51:37Z

CI: https://ci.nodejs.org/job/node-test-pull-request/44561/

hemanth · 2022-06-14T22:30:56Z

We should also add this to the docs right?

cjihrig · 2022-06-14T23:09:57Z

Yes, this would require a docs update.

hemanth · 2022-06-17T22:31:17Z

Is this ready enough?

cjihrig

Left a few comments. It would be good for others to weigh in on things like the overall API design and whether or not we should make this experimental first.

doc/api/util.md

cjihrig · 2022-06-21T02:21:01Z

doc/api/util.md

+added: v18.3.0
+-->
+
+* `format` {string} `format` one of the color format from `util.inspect.colors`


We should probably link util.inspect.colors to https://nodejs.org/api/util.html#customizing-utilinspect-colors.

doc/api/util.md

cjihrig · 2022-06-21T02:29:23Z

doc/api/util.md

+Takes `format` and `text` and retuns the colored text form
+
+```js
+const util = require('node:util');


Can you remove this line. Otherwise we'll need to show the same example code for CJS and ESM.

cjihrig · 2022-06-21T02:29:58Z

doc/api/util.md

+const util = require('node:util');
+
+console.log(util.colorText('red', 'This text shall be in red color'));
+// ^ '\u001b[31mThis text shall be in red color\u001b[39m'


Suggested change

// ^ '\u001b[31mThis text shall be in red color\u001b[39m'

// ^ '\u001b[31mThis text shall be colored red\u001b[39m'

s/shall be/is?

cjihrig · 2022-06-21T02:30:56Z

lib/util.js

+ function colorText(format, text) {
+  validateString(format, 'format');
+  validateString(text, 'text');
+  const formatCodes = inspect.colors[format];


Yes, that's what I originally meant.

cjihrig · 2022-06-21T02:33:08Z

test/parallel/test-util-colorText.js

+assert.throws(() => {
+  util.colorText('red', undefined);
+}, {
+  code: 'ERR_INVALID_ARG_TYPE',
+  message: 'The "text" argument must be of type string. Received undefined'
+});


Wouldn't this already be tested on line 20 when invalidOption is undefined?

Right, this should rather be util.colorText(undefined, undefined);

doc/api/util.md

ljharb · 2022-06-21T04:15:50Z

doc/api/util.md

+const util = require('node:util');
+
+console.log(util.colorText('red', 'This text shall be in red color'));
+// ^ '\u001b[31mThis text shall be in red color\u001b[39m'


s/shall be/is?

ljharb · 2022-06-21T04:16:10Z

lib/util.js

+ function colorText(format, text) {
+  validateString(format, 'format');
+  validateString(text, 'text');
+  const formatCodes = inspect.colors[format];


Is inspect.colors mutable and exposed to users?

Co-authored-by: Colin Ihrig <cjihrig@gmail.com>

Co-authored-by: Jordan Harband <ljharb@gmail.com>

BridgeAR

I am hesitant to add new formatting functionalities to util (console does not seem ideal either). I just opened a something similar API: #43523. It does a bit more by also allowing nested colors, this functionality here does not do that (e.g., colorText('green', 'green ' + colorText('red', 'red') + ' green') would end up being colored: green red defaultColor instead of green red green).

jasnell · 2022-06-27T17:18:13Z

Let's throw this into the TSC agenda as part of the discussion for #43523

mcollina · 2022-07-13T12:23:50Z

Dropping it from the tsc-agenda until #43382 is resolved.

felixfbecker · 2024-03-06T21:52:06Z

doc/api/util.md

+added: REPLACEME
+-->
+
+* `format` {string} A color format defined in `util.inspect.colors`.


Accepting string | string[] would be really helpful to e.g. make text both a certain color and underline/italic/bold/... at the same time

mcollina · 2024-03-07T09:11:32Z

Superseded by #51850

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hemanth commented Jun 10, 2022

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hemanth changed the title ~~util: Adding colorText method to util~~ util: add colorText method Jun 20, 2022

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Co-authored-by: Colin Ihrig <cjihrig@gmail.com>

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util: add colorText method #43371

util: add colorText method #43371

hemanth commented Jun 10, 2022 •

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mcollina commented Mar 7, 2024

	// ^ '\u001b[31mThis text shall be in red color\u001b[39m'
	// ^ '\u001b[31mThis text shall be colored red\u001b[39m'

util: add colorText method #43371

util: add colorText method #43371

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