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theme: add live theming for chromium-based browsers (#103)

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* theme: add live theming for chromium-based browsers

Writes the surface colour as an RGB triplet to chromium.theme and
applies it as a managed browser policy for chromium, brave, and
google-chrome-stable using the --refresh-platform-policy flag
(introduced in Chrome 142+).

Also fixes write_file to set 0644 permissions so browser processes
can read the policy files.

* feat: use sudo tee not chmod

* chore: update readme

---------

Co-authored-by: 2 * r + 2 * t <61896496+soramanew@users.noreply.github.com>
This commit is contained in:
Yuka
2026-04-15 14:20:15 +08:00
committed by GitHub
parent 66bce26841
commit 5f1d008cce
2 changed files with 75 additions and 32 deletions
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README.md
+40 -30
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@@ -18,35 +18,6 @@ The main control script for the Caelestia dotfiles.
</details>
<details><summary id="optional-dependencies">Optional dependencies</summary>
- [`papirus-folders`](https://github.com/PapirusDevelopmentTeam/papirus-folders) - automatic folder icon color syncing with theme
> [!NOTE]
> For automatic Papirus folder icon color syncing, `papirus-folders` needs to be able to run with `sudo` without a password prompt.
>
> **Recommended** - Create a sudoers file:
>
> ```fish
> # Fish shell
> echo "$USER ALL=(ALL) NOPASSWD: "(which papirus-folders) | sudo tee /etc/sudoers.d/papirus-folders
> sudo chmod 440 /etc/sudoers.d/papirus-folders
> ```
>
> ```sh
> # Bash/other shells
> echo "$USER ALL=(ALL) NOPASSWD: $(which papirus-folders)" | sudo tee /etc/sudoers.d/papirus-folders
> sudo chmod 440 /etc/sudoers.d/papirus-folders
> ```
>
> **Alternatively** - Edit the main sudoers file by running `sudo visudo` and adding at the end:
>
> ```
> your_username ALL=(ALL) NOPASSWD: /usr/bin/papirus-folders
> ```
</details>
## Installation
### Arch linux
@@ -122,6 +93,45 @@ sudo python -m installer dist/*.whl
sudo cp completions/caelestia.fish /usr/share/fish/vendor_completions.d/caelestia.fish
```
### Additional steps
#### Auto folder colour theming
For automatic Papirus folder icon colour syncing, you must have [`papirus-folders`](https://github.com/PapirusDevelopmentTeam/papirus-folders)
installed, and `papirus-folders` must to be able to run with `sudo` without a password prompt.
You can allow this by creating a sudoers file:
```sh
echo "$USER ALL=(ALL) NOPASSWD: $(which papirus-folders)" | sudo tee /etc/sudoers.d/papirus-folders
sudo chmod 440 /etc/sudoers.d/papirus-folders
```
#### Chromium-based browser theming
For live Chromium-based browser theming, the CLI must be allowed to create certain directories in `/etc`
and write to them via `sudo` without a password prompt.
You can allow this by creating a sudoers file:
```fish
# Fish shell
for dir in /etc/chromium/policies/managed /etc/brave/policies/managed /etc/opt/chrome/policies/managed
echo "$USER ALL=(ALL) NOPASSWD: $(which mkdir) -p $dir" | sudo tee -a /etc/sudoers.d/caelestia-chromium
echo "$USER ALL=(ALL) NOPASSWD: $(which tee) $dir/caelestia.json" | sudo tee -a /etc/sudoers.d/caelestia-chromium
end
sudo chmod 440 /etc/sudoers.d/caelestia-chromium
```
```sh
# Bash/other shells
for dir in /etc/chromium/policies/managed /etc/brave/policies/managed /etc/opt/chrome/policies/managed; do
echo "$USER ALL=(ALL) NOPASSWD: $(which mkdir) -p $dir" | sudo tee -a /etc/sudoers.d/caelestia-chromium
echo "$USER ALL=(ALL) NOPASSWD: $(which tee) $dir/caelestia.json" | sudo tee -a /etc/sudoers.d/caelestia-chromium
done
sudo chmod 440 /etc/sudoers.d/caelestia-chromium
```
## Usage
All subcommands/options can be explored via the help flag.
@@ -151,7 +161,7 @@ subcommands:
resizer window resizer daemon
```
### User Templates
### User templates
Custom user templates can be defined in `~/.config/caelestia/templates/`.