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Add capability-scoped module API (Workstream D)

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ModuleManifest gains a structured [[permissions]] field (bread-shared's
new ModulePermission/PermissionKind, shared between bread-cli and breadd
so the two never drift on what a permission "type" string means).

breadd now gives every third-party module's Lua chunk a scoped _ENV
instead of the shared global table: load_scoped_lua_file builds a fresh
`bread` table containing only baseline bindings (event subscription,
timers, json, module/store, logging, and the pure-Lua sugar built on top
of those) plus whatever the manifest's permissions grant, with a
metatable __index falling back to the real globals for everything else
(stdlib, require/package - so require("bread.devices") keeps working,
since builtins load unscoped and their closures capture that environment
lexically regardless of the caller's). _G is explicitly rebound to the
scoped table itself to close the obvious escape hatch. A module with no
manifest, or a manifest with no permissions key, keeps full ambient
access unchanged (today's behavior) but is now tracked as `ungated` in
module status and surfaced by `bread doctor`. An explicit `permissions =
[]` is scoped for real but not flagged, since that's a deliberate
declaration.

Adds `bread modules audit <name>`: a best-effort text scan of a module's
.lua files suggesting a [[permissions]] block to paste into its manifest.

Converts examples/modules/cpu-temp-widget.lua into a directory module
with a worked bread.module.toml (fs.read + widget) as the reference
example. Documentation.md gets a new "Capability-scoped modules" section
covering the taxonomy, the require()/closure mechanism, and an explicit
note that path/bin scoping is recorded but not yet enforced per-call -
that's the out-of-process module sandboxing workstream this manifest
schema is laid down for. API_VERSION bumped 1.4.0 -> 1.5.0.
This commit is contained in:
Breadway 2026-08-04 22:24:16 +08:00
parent 96639516b1
commit 6841163620
13 changed files with 1329 additions and 14 deletions
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18
examples/modules/README.md
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@ -14,6 +14,22 @@ cp low-battery-warning.lua ~/.config/bread/modules/
bread reload
```
`cpu-temp-widget/` is a directory (not a flat file) with a `bread.module.toml`
manifest declaring its `[[permissions]]` — see
[Capability-scoped modules](../../Documentation.md#capability-scoped-modules-since-v15).
Either copy the whole directory into `~/.config/bread/modules/`, or install it
properly so the manifest travels with it:
```sh
bread modules install ./cpu-temp-widget
bread reload
```
The other modules here are flat files with no manifest — they load exactly
like today, with full, ungated `bread.*` access (`bread doctor` will note
that). Run `bread modules audit <name>` on an installed one any time to get a
suggested `[[permissions]]` block for its own `bread.module.toml`.
## Modules
| File | What it does | Config needed |
@ -22,7 +38,7 @@ bread reload
| `pause-media-on-headphone-unplug.lua` | Runs `playerctl pause` when a headphone/earbud device disconnects. | none (needs `playerctl`) |
| `dock-monitors.lua` | Applies a multi-monitor layout when an external display connects, reverts when removed. | edit output names/resolutions |
| `active-window-widget.lua` | Shows the focused window next to the workspace pills in breadbar, via `bread.widget` + `bread.state.watch`. | none |
| `cpu-temp-widget.lua` | Live CPU temperature readout in breadbar's stats area, via `bread.widget` + `bread.fs.read` on a timer. | edit `TEMP_PATH` for your hwmon layout |
| `cpu-temp-widget/` | Live CPU temperature readout in breadbar's stats area, via `bread.widget` + `bread.fs.read` on a timer. Directory module with a `bread.module.toml` declaring `fs.read` + `widget` — the permission-manifest worked example. | edit `TEMP_PATH` for your hwmon layout |
| `bluetooth-toggle-widget.lua` | One-click Bluetooth power toggle in breadbar's tray, via `bread.widget` + a click handler. | none |
| `focus-mode-widget.lua` | Click-to-toggle "Focus" profile that mutes audio; a widget as an action launcher, not just a readout, and stays in sync with profile changes triggered elsewhere. | none (needs `wpctl`) |
| `workflow-status-widget.lua` | Surfaces `bread.workflow.list()` in breadbar's tray — shows whichever workflow (e.g. `dock-workflow.lua`, below) is currently running or failed, hidden otherwise. | none |