nvf/docs/manual/hacking/additional-plugins.md
2024-04-06 20:33:31 +00:00

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# Adding Plugins {#sec-additional-plugins}
To add a new neovim plugin, first add the source url in the inputs section of `flake.nix`
```nix
{
inputs = {
# ...
neodev-nvim = {
url = "github:folke/neodev.nvim";
flake = false;
};
# ...
};
}
```
Then add the name of the plugin into the `availablePlugins` variable in `lib/types/plugins.nix`:
```nix
# ...
availablePlugins = [
# ...
"neodev-nvim"
];
```
You can now reference this plugin using its string name:
```nix
config.vim.startPlugins = ["neodev-nvim"];
```
## Modular setup options {#sec-modular-setup-options}
Most plugins is initialized with a call to `require('plugin').setup({...})`.
We use a special function that lets you easily add support for such setup options in a modular way:
`mkPluginSetupOption`.
Once you have added the source of the plugin as shown above, you can define the setup options like
this:
```nix
# in modules/.../your-plugin/your-plugin.nix
{lib, ...}:
let
inherit (lib.types) bool int;
inherit (lib.nvim.types) mkPluginSetupOption;
in {
options.vim.your-plugin = {
setupOpts = mkPluginSetupOption "plugin name" {
enable_feature_a = mkOption {
type = bool;
default = false;
# ...
};
number_option = mkOption {
type = int;
default = 3;
# ...
};
};
};
}
```
```nix
# in modules/.../your-plugin/config.nix
{lib, config, ...}:
let
cfg = config.vim.your-plugin;
in {
vim.luaConfigRC = lib.nvim.dag.entryAnywhere ''
require('plugin-name').setup(${lib.nvim.lua.toLuaObject cfg.setupOpts})
'';
}
```
This above config will result in this lua script:
```lua
require('plugin-name').setup({
enable_feature_a = false,
number_option = 3,
})
```
Now users can set any of the pre-defined option field, and can also add their own fields!
```nix
# in user's config
{
vim.your-plugin.setupOpts = {
enable_feature_a = true;
number_option = 4;
another_field = "hello";
size = { # nested fields work as well
top = 10;
};
};
}
```
## Details of toLuaObject {#sec-details-of-toluaobject}
As you've seen above, `toLuaObject` is used to convert our nix attrSet `cfg.setupOpts`, into a lua
table. Here are some rules of the conversion:
1. nix `null` converts to lua `nil`
2. number and strings convert to their lua counterparts
3. nix attrSet/list converts into lua tables
4. you can write raw lua code using `lib.generators.mkLuaInline`. This function is part of nixpkgs.
```nix
vim.your-plugin.setupOpts = {
on_init = lib.generators.mkLuaInline ''
function()
print('we can write lua!')
end
'';
}
```