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Language Server Protocol plugin for micro-editor

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# µlsp

LSP client for [micro-editor](https://github.com/zyedidia/micro).
Note that this is a work in progress and has not yet been tested extensively – expect there to be some bugs.
Please [open an issue](https://github.com/Andriamanitra/mlsp/issues/new) if you run into any!

## Demo

[https://asciinema.org/a/610761](https://asciinema.org/a/610761)

## Installation

Simply clone the repository to your micro plugins directory:

```
git clone https://github.com/Andriamanitra/mlsp ~/.config/micro/plug/mlsp
```

You will also need to install [language servers](LanguageServers.md) for the
programming languages you want to use.

The plugin currently provides following commands:

- `lsp start deno lsp` starts a language server by executing command `deno lsp`.
  Without arguments the `lsp start` command will try to guess the right server by
  looking at the currently open filetype.
- `lsp stop deno` stops the language server with name `deno`. Without arguments
  the `lsp stop` command will stop _all_ currently running language servers.
- `lsp hover` shows hover information for the code under cursor.
- `lsp format` formats the buffer that is currently open.
- `lsp autocomplete` for code completion suggestions. PROTIP: If you wish to use the
  same key as micro's autocompletion (tab by default), enable `tabAutocomplete`
  in `config.lua` instead of binding `command:lsp autocomplete` to a key!
- `lsp goto-definition` – open the definition for the symbol under cursor
- `lsp goto-declaration` – open the declaration for the symbol under cursor
- `lsp goto-typedefinition` – open the type definition for the symbol under cursor
- `lsp goto-implementation` – open the implementation for the symbol under cursor
- `lsp find-references` - find all references to the symbol under cursor (shows the results in a new pane)
- `lsp document-symbols` - list all symbols in the current document
- `lsp diagnostic-info` - show more information about a diagnostic on the current line (useful for multiline diagnostic messages)
- `lsp rename new_name` - renames the symbol under cursor to `new_name`. Without
  arguments the `lsp rename` command will prompt for a new name.

You can type the commands on micro command prompt or bind them to keys by adding
something like this to your `bindings.json`:

```json
{
  "F7": "command:lsp start",
  "F8": "command:lsp format",
  "Alt-h": "command:lsp hover",
  "Alt-d": "command:lsp goto-definition",
  "Alt-r": "command:lsp find-references"
}
```

## Supported features

- [x] get hover information
- [x] show diagnostics (disabled by default, edit `config.lua` to enable)
- [x] autocomplete using tab (disabled by default, edit `config.lua` to enable)
- [x] format document
- [x] format selection
- [x] go to definition
- [x] go to declaration
- [x] go to implementation
- [x] go to type definition
- [x] find references
- [x] list document symbols
- [ ] list workspace symbols
- [x] rename symbol
- [ ] code actions
- [ ] workspace commands
- [x] incremental document synchronization (better performance when editing large files)
- [ ] [suggest a feature](https://github.com/Andriamanitra/mlsp/issues/new)

## Showing LSP information on statusline

The plugin provides a function `mlsp.status` that can be used in the status line format.
Here is an example configuration (`~/.config/micro/settings.json`) that uses it:

```json
{
    "statusformatl": "$(filename) $(modified)($(line),$(col)) | ft:$(opt:filetype) | µlsp:$(mlsp.status)"
}
```

See [micro documentation](https://github.com/zyedidia/micro/blob/master/runtime/help/options.md)
and the built-in [status plugin](https://github.com/zyedidia/micro/blob/master/runtime/plugins/status/help/status.md)
for more information on customizing the statusline.

## Known issues

- Document synchronization for language servers that don't support incremental text document synchronization (eg. metals) does not work properly on micro versions older than 2.0.14
- Unicode characters that require more than one UTF-16 code unit (such as emojis) are not handled properly ([#34](https://github.com/Andriamanitra/mlsp/issues/34))

## Other similar projects

* [AndCake/micro-plugin-lsp](https://github.com/AndCake/micro-plugin-lsp) is another LSP plugin for micro-editor.

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