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# LSP Plugin for Lite XL editor
Plugin that provides intellisense for Lite XL by leveraging the [LSP protocol]
While still a work in progress it already implements all the most important
features to make your life easier while coding with Lite XL. Using it
requires __Lite XL v2.1+__ (for __Lite XL v2.0.1__ to __Lite XL v2.0.5__
check out the __0.1__ branch). [lint+] is optionally used to render
diagnostic messages while you type so make sure to get it. Also, the
[snippets] plugin is used to properly process the received autocompletions
in the form of snippets, so grab that too.
To use, clone this project into the __lsp__ directory in your plugins
folder. Finally you will need the [Widgets] lib so make sure to also drop
it into your lite-xl configs directory. For example:
```sh
cd ~/.config/lite-xl/
git clone https://github.com/lite-xl/lite-xl-lsp plugins/lsp
git clone https://github.com/lite-xl/lite-xl-widgets libraries/widget
git clone https://github.com/liquidev/lintplus plugins/lintplus
wget https://raw.githubusercontent.com/vqns/lite-xl-snippets/main/snippets.lua \
-O plugins/snippets.lua
wget https://raw.githubusercontent.com/vqns/lite-xl-snippets/main/lsp_snippets.lua \
-O plugins/lsp_snippets.lua
```
The lite-xl configs directory should have:
* ~/.config/lite-xl/libraries/widget/
* ~/.config/lite-xl/plugins/lsp/
* ~/.config/lite-xl/plugins/lintplus/
* ~/.config/lite-xl/plugins/snippets.lua
* ~/.config/lite-xl/plugins/lsp_snippets.lua
## Features
Stuff that is currently implemented:
* Code auto completion (**ctrl+space**)
* Function signatures tooltip (**ctrl+shift+space**)
* Current cursor symbol details tooltip on mouse hover or shortcut (**alt+a**)
* Goto definition (**alt+d**)
* Goto implementation (**alt+shift+d**)
* View/jump to current document symbols (**alt+s**)
* Find workspace symbols (**alt+shift+s**)
* View/jump to symbol references (**alt+f**)
* View/jump to document diagnostic messages (**alt+e**)
* Document format (**alt+shift+f**)
* Optional diagnostics rendering while typing with [lint+]
(**alt+shift+e** to toggle)
* List all documents with diagnostics (**ctrl+alt+e**)
* Snippets processing using the [snippets] plugin
## Setting a LSP Server
The easiest method of setting up a lsp server is by using the __[config.lua]__
file shipped with the lsp plugin which already contains a list of predefined
servers (notice: not all of them have been tested to work). Require this file
on your users **init.lua**, call `setup()` on the desired lsp servers or
overwrite the configuration options of the defined lsp servers if needed
as shown below:
__Examples:__
```lua
local lspconfig = require "plugins.lsp.config"
-- Activate clangd without overwriting any settings for c/c++
-- autocompletion (requires a compile_commands.json file on
-- your project directory usually generated by build tools
-- like cmake or meson)
-- See: https://clangd.llvm.org/installation.html#project-setup
lspconfig.clangd.setup()
-- Activate gopls
lspconfig.gopls.setup()
-- Activate the lua-language-server, set the server command and
-- modify the default settings in order to disable diagnostics.
lspconfig.sumneko_lua.setup {
command = {
"/path/to/lua-language-server/bin/Linux/lua-language-server",
"-E",
"/path/to/lua-language-server/main.lua"
},
settings = {
Lua = {
diagnostics = {
enable = false
}
}
}
}
-- Activate intelephense and pass additional initializationOptions
-- like the license key and storage path.
lspconfig.intelephense.setup {
init_options = {
licenceKey = "MYLICENSEKEY",
storagePath = "/home/myuser/.cache/intelephense"
}
}
```
If your preferred LSP server is not listed on the config.lua file feel free
to submit a __pull request__ with the addition!
## Manually Configuring a LSP Server
Besides the __[config.lua]__ method, you can fully define an lsp server in
your user init.lua file. You would need to require the lsp plugin and use the
**add_server** function as shown on the following example:
```lua
local lsp = require "plugins.lsp"
lsp.add_server {
-- Name of server
name = "intelephense",
-- Main language
language = "PHP",
-- If the server supports multiple languages:
-- language = {
-- { id = "javascript", pattern = "%.js$" },
-- { id = "typescript", pattern = "%.ts$" },
-- }
-- If no pattern matches, the file extension is used instead.
-- File types that are supported by this server
file_patterns = { "%.php$" },
-- LSP command and optional arguments
command = { "intelephense", "--stdio" },
-- Optional table of settings to pass into the lsp
-- Note that also having a settings.json or settings.lua in
-- your workspace directory with a table of settings is supported.
settings = {
intelephense = {
files = {
exclude = {
"**/.git/**"
}
}
}
},
-- Optional table of initializationOptions for the LSP
init_options = {
storagePath = "/home/myuser/.cache/intelephense"
},
-- Set by default to 16 should only be modified if having issues with a server
requests_per_second = 16,
-- Some servers like bash language server support incremental changes
-- which are more performant but don't advertise it, set to true to force
-- incremental changes even if server doesn't advertise them.
incremental_changes = false,
-- True to debug the lsp client when developing it
verbose = false
}
```
## LSP Plugin Settings
Configuration options that can be used to control the plugin behaviour:
```lua
---Show a symbol hover information when mouse cursor is on top.
---@type boolean
config.plugins.lsp.mouse_hover = true
---The amount of time in milliseconds before showing the tooltip.
---@type integer
config.plugins.lsp.mouse_hover_delay = 300
---Show diagnostic messages
---@type boolean
config.plugins.lsp.show_diagnostics = true
---Stop servers that aren't needed by any of the open files
---@type boolean
config.plugins.lsp.stop_unneeded_servers = true
---Set to a file path to log all json
---@type string
config.plugins.lsp.log_file = ""
---Setting to true prettyfies json for more readability on the log
---but this setting will impact performance so only enable it when
---in need of easy to read json output when developing the plugin.
---@type boolean
config.plugins.lsp.prettify_json = false
---Send a server stderr output to lite log
---@type boolean
config.plugins.lsp.log_server_stderr = false
---Force verbosity off even if a server is configured with verbosity on
---@type boolean
config.plugins.lsp.force_verbosity_off = false
---Yield when reading from LSP which may give you better UI responsiveness
---when receiving large responses, but will affect LSP performance.
---@type boolean
config.plugins.lsp.more_yielding = false
```
## TODO
- [ ] Properly handle multiple opened project directories
- [ ] Handle window/showMessage, window/showMessageRequest,
$/progress, telemetry/event
- [x] Be able to search workspace symbols 'workspace/symbol'
- [ ] Completion preselectSupport (needs autocomplete plugin change)
- [ ] Add symbol renaming support 'textDocument/rename'
- [x] Add Snippets support (this will need a whole standalone [snippets] plugin).
- [x] Fix issues when parsing stdout from some lsp servers (really fixed?).
- [x] More improvements to autocomplete.lua plugin
- [x] Detect view edges and render to the most visible side
- [x] Description box, detect view width and expand accordingly
- [ ] Support for pre-selected item
- [ ] Be able to use a custom sorting field.
- [x] Add hover support for function arguments
- [x] Add custom tooltip that accents active parameter and signature
- [x] Figure out how to get an autocompletion item full documentation with
'completionItem/resolve' or any other in order to better populate
the new autocomplete item description
- [x] (we kill it) Detect if lsp server hangs and restart it (eg: clangd)
- [x] Exit LSP server if no open document needs it.
- [x] Add hover support for symbols
- [x] Generate list of current document symbols for easy document navigation
- [x] Goto definition
- [x] Display select box when more than one result
- [x] Show diagnostics on active document similar to the linter plugin.
- [x] Send incremental changes on textDocument/didChange notification
since sending the whole document content on big files is slow and bad.
## Screenshots
Some images to easily visualize the progress :)
### Completion
![Completion](screenshots/completion01.png)
![Completion](screenshots/completion02.png)
![Completion](screenshots/completion03.png)
![Completion](screenshots/completion04.png)
### Symbol hover
![Hover](screenshots/hover01.png)
![Hover](screenshots/hover02.png)
### Function signatures
![Signature](screenshots/signatures01.png)
### Document symbols
![Doc Symbols](screenshots/docsym01.png)
![Doc Symbols](screenshots/docsym02.png)
### Goto definition
![Goto Definition](screenshots/gotodef01.png)
### Diagnostics rendering using Lint+
![Diagnostics](screenshots/diagnostics01.png)
[LSP protocol]: https://microsoft.github.io/language-server-protocol/specifications/specification-current/
[lint+]: https://github.com/liquidev/lintplus
[snippets]: https://github.com/vqns/lite-xl-snippets
[Widgets]: https://github.com/lite-xl/lite-xl-widgets
[config.lua]: config.lua