fix nu-themes package

[amtoine]

• followup to Simplify theme usage #896
• cc/ @NotTheDr01ds

description

this PR puts back a few themes that have been removed in the previous PR and fixes the commands in the README.

a few questions

@NotTheDr01ds, i have a few questions too :)

• is it required to have a separate activate module? why not directly put the export-env in the module?
• i don't understand the update terminal command, what does it do?

[fdncred]

update terminal uses the osc ansi escapes 10, 11, 12 to change the foreground color, background color, and cursor color in terminals that support it.

[amtoine]

update terminal uses the osc ansi escapes 10, 11, 12 to change the foreground color, background color, and cursor color in terminals that support it.

yeah, but when i run the following

source nu-themes/dracula.nu

it immediately changes the theme to Dracula for me

then, the following does not appear to change anything, that's why im not sure i fully understand this command 😉

use nu-themes/dracula.nu
dracula update terminal

[fdncred]

Correct. This is a bug that @NotTheDr01ds has filed. nushell/nushell#13403

[NotTheDr01ds]

@amtoine Perhaps I need to make the README more clear, but:

Before the change:

• Terminal OSC codes were never updated automatically:

  use <theme_file>
  $env.config.color_config = (<theme>)
  

  That only updated the color_config, but not the terminal's colors (OSC codes). There was no code, nor instructions in the README, on how to update the terminal colors. I only found that code in @fdncred's preview scripts.

After the change:

• source'ing it will update everything (including OSC)
• use'ing it will allow the user to set or query elements individually. This provides full backwards compatibility and allows users to have it to still work like it used to, which is what I personally want - I don't want to update my background color when using a new "dark" theme - Most of them change it from deep black to a gray-level.

As for this PR - I'm in the process of updating the old themes (manual) so that they work like the updated ones do. While I'm fine with the "old" ones going in temporarily, I'm working on making sure that they don't get lost again by having their generation be part of the make.nu script.

[NotTheDr01ds]

Correct. This is a bug that ...

Not quite - The behavior that @amtoine describes is correct. If you source the theme, it's fully activated, then a <theme> update terminal isn't going to have any effect, because that code was already run when it was sourced.

[amtoine]

oooooooh, i understand now @NotTheDr01ds !!
i was confused about the background changing color on source 😱

your explanation is much much clearer, thanks a lot 🙏
could you mention this in the README?

• maybe move the first source out of the "installation" section
• mention that set color_config won't change the background whereas source ... and update terminal will (the background is the easiest to see it appears)

[NotTheDr01ds]

@amtoine A couple of questions:

• Can we close this one in favor of Recover non-lemnos themes #902?
• Should the Nupm instructions be moved to the root README at the nu_scripts level, since that's what actually gets installed, right?

[amtoine]

yup, we can do that, thanks @NotTheDr01ds 🙏