##### ⚠️ targeting 1.15
## Summary of the Pull Request
Adds support for Themes, a new type of customization for the Terminal. Themes allow the user to customize elements of the Terminal window itself. In this first iteration, this PR adds support for two main properties:
* enabling Mica as the window backdrop
* changing the tab row color (read: changing the titelbar color)
These represent the most important asks of theming in the Terminal. The properties added in this PR are:
* Theme color variants:
- `"#rrggbb"` or `"#aarrggbb"`
- `"accent"`
- `"terminalBackground"`
* Properties (_listed here in dot notation, but implemented as sub-objects_)
- `tabRow.background`: accepts a ThemeColor (above)
- `window.applicationTheme`: accepts one of `{"system", "light", "dark"}`
- `window.useMica`: accepts a boolean, defaults to false.
## References
* As first described in #3327
* spec'd in #12530
## PR Checklist
* [x] Sorta enables #10509, but doesn't close it. That'll need more comprehensive changes to the titlebar code.
* **update**: I totally disabled mica, but left the serialization code. It just seems silly without #10509.
* [x] Closes#1963
* [x] Closes#3774
* [x] Closes#12939
* [x] Does the bulk of the #3327 work, but I'm going to leave that open since that's become my megathread for everything related to theming.
* [x] I work here
* [x] Tests added/passed
* [ ] Requires documentation to be updated - **SURE DOES**
## Detailed Description of the Pull Request / Additional comments
### --> GO READ #12530 <--
Seriously.
These themes aren't customizable in the SUI currently. You can change the active theme, and the UI will show all of the defined themes, but they're not editable there.
They don't layer. You'll need to define your own themes.
Thay can't come from fragments. This is a really cool future idea, but not implemented in this v0.
The sub objects have some gnarly macros to generate a lot of the serialization code for you.
### TODOs
* [x] I still have yet to establish what the accent color algorithm is. This might be proprietary and require a ThemeHelpers workaround.
* [x] Make sure `terminalBackground` & the SUI result in something sensible
* [x] Make sure runtime BG changes work with `terminalBackground`. One time, they didn't. `printf "\x1b]11;rgb:ff/00/ff\x07"`
* [x] Acrylic Terminal BG's look weird, like, the opacity is always 50% or something. And the tab row looks all wrong then.
## Validation Steps Performed
This is the blob I've been testing with:
<details>
```jsonc
// "useAcrylicInTabRow": true,
"theme": "my dark",
// "theme": "Edge",
"theme": "orangey",
"theme": "WHITE",
// "theme": "terminal",
"themes": [
{
"name": "my dark",
"window": {
"applicationTheme": "dark",
"useMica": true,
},
"tabRow": {
"background": "#00000000",
},
},
{
"name": "Edge",
"tabRow": { "background": "accent" },
"window": { "applicationTheme": "system" }
},
{
"name": "orangey",
"window": {
"applicationTheme": "light",
"useMica": true,
},
"tabRow": {
"background": "#ff8800",
},
},
{
"name": "WHITE",
"window": {
"applicationTheme": "dark",
"useMica": true,
},
"tabRow": {
"background": "#FFFFFF",
},
},
{
"name": "terminal",
"window": {
"applicationTheme": "dark",
"useMica": false,
},
"tabRow": {
"background": "terminalBackground",
},
},
]
```
</details>
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