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clice/docs/en/dev/server-plugin.md
2026-01-26 01:01:39 +08:00

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You can implement a clice server plugin to extend clice's functionality.
## Use case
When you use `clice` as lsp backend of LLM agents, e.g. claude code, you can add plugin to provide some extra features.
## Writing a plugin
When a plugin is loaded by the server, it will call `clice_get_server_plugin_info` to obtain information about this plugin and about how to register its customization points.
This function needs to be implemented by the plugin, see the example below:
```c++
extern "C" ::clice::PluginInfo LLVM_ATTRIBUTE_WEAK
clice_get_server_plugin_info() {
return {
CLICE_PLUGIN_API_VERSION, "MyPlugin", "v0.1", CLICE_PLUGIN_DEF_HASH,
[](ServerPluginBuilder builder) { ... }
};
}
```
See [PluginDef.h](/include/Server/PluginDef.h) for more details.
## Getting content of `CLICE_PLUGIN_DEF_HASH`
There are two values to return in the `clice_get_server_plugin_info` function.
- `CLICE_PLUGIN_API_VERSION` is used to ensure compability of the `clice_get_server_plugin_info` function between the plugin and the server.
- `CLICE_PLUGIN_DEF_HASH` is used to ensure the consistency of the C++ declarations between the plugin and the server.
To debug the content of `CLICE_PLUGIN_DEF_HASH`, you can run following command:
```shell
$ git clone https://github.com/clice-io/clice.git
$ cd clice
$ git checkout `clice --version --git-describe`
$ python scripts/plugin-def.py content
```
You will get a C source code file, content of which is like this:
```cpp
#if 0
// begin of config/llvm-manifest.json
[
{
"version": "21.1.4+r1",
"filename": "arm64-macos-clang-debug-asan.tar.xz",
"sha256": "7da4b7d63edefecaf11773e7e701c575140d1a07329bbbb038673b6ee4516ff5",
"lto": false,
"asan": true,
"platform": "macosx",
"build_type": "Debug"
},
...
]
...
#endif
```