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feat(plugin): load external cdylib plugins at runtime (phase 2)

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Move BuiltinPlugin into ocs_plugin_api (host feature) so out-of-tree
crates can implement it, and add export_plugin! to emit the two C
symbols a cdylib exposes: ocs_plugin_api_version (checked first, so an
ABI-incompatible build never runs) and ocs_plugin_register -> boxed
BuiltinPlugin. The host loads every compatible package from the plugins
folder at startup via libloading (desktop only), keeps the library
resident for the session, and merges its ribbon tab + command dispatch
into the same paths as built-ins (honouring enable/disable). The Plugin
Manager shows external packages with a Loaded / incompatible status.

Approach B: the plugin hands back a boxed trait object, assuming a
matching toolchain + ocs_plugin_api version (the version symbol enforces
the latter). crates/ocs_example_plugin is the reference cdylib.

Part of the #100 extensibility epic (phase 2).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Hakan Seven 2026-06-17 14:48:56 +03:00
commit 29c71be101
14 changed files with 402 additions and 36 deletions
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20
src/app/mod.rs
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@ -298,8 +298,11 @@ pub(super) struct OpenCADStudio {
/// dispatch. Persisted via [`settings::UserSettings::disabled_plugins`].
disabled_plugins: rustc_hash::FxHashSet<String>,
/// External add-on packages found in the plugins folder, refreshed when the
/// Plugin Manager opens. Discovery only — not yet loaded (phase 2).
/// Plugin Manager opens.
external_plugins: Vec<crate::plugin::external::ExternalPlugin>,
/// Ids of external packages actually loaded this session (a subset of
/// `external_plugins` — compatible, with a library, dlopen'd at startup).
loaded_plugin_ids: rustc_hash::FxHashSet<String>,
/// PDSIZE text buffer for the Point Style (DDPTYPE) dialog.
point_size_buf: String,
/// Point Style size mode: `true` = relative to screen, `false` = absolute.
@ -1465,6 +1468,7 @@ impl OpenCADStudio {
modal_dragging: false,
disabled_plugins: rustc_hash::FxHashSet::default(),
external_plugins: Vec::new(),
loaded_plugin_ids: rustc_hash::FxHashSet::default(),
point_size_buf: String::new(),
point_size_relative: true,
default_assoc_prompted: false,
@ -1644,6 +1648,20 @@ impl OpenCADStudio {
if let Some(s) = settings::UserSettings::load() {
app.apply_settings(&s);
}
// Load external plugin packages from the plugins folder once, then fold
// their ribbon tabs into the ribbon. Skipped under test/wasm.
#[cfg(all(not(target_arch = "wasm32"), not(test)))]
{
for (id, res) in crate::plugin::external::load_at_startup() {
if let Err(e) = res {
app.command_line
.push_error(&format!("Plugin '{id}' failed to load: {e}"));
}
}
app.loaded_plugin_ids =
crate::plugin::external::loaded_ids().into_iter().collect();
app.rebuild_ribbon_modules();
}
app.last_saved_settings = Some(app.current_settings());
app.sync_ribbon_layers();
app