idris2-lsp

Language Server for Idris2.

NOTE: At this stage the LSP server requires an ipkg file to work correctly, for reference material about packages look here and here. To start a new project with an ipkg, even for a single file, you can issue the idris2 --init command, which provides an interactive interface for package creation.

Installation with Pack (Recommended)

pack install-app idris2-lsp

Manual Installation

# If you already have idris2, uninstall idris2 unless you installed it from source
git clone https://github.com/idris-community/idris2-lsp.git # Clone this repository
cd idris2-lsp
git submodule update --init Idris2 # Get the associated Idris commit
cd Idris2 # Change into the Idris2 directory
make bootstrap SCHEME=chez # Boostrap Idris
make install # Install Idris
# If needed, modify your shell files to ensure ~/.idris2/bin is in your PATH
make clean # Clean Idris
make all # Build Idris
make install # Install Idris
make install-with-src-libs # Install sources for libraries
make install-with-src-api # Install the API with sources
cd .. # Go back to the idris2-lsp directory
git submodule update --init LSP-lib # Get the associated LSP-lib commit
cd LSP-lib
idris2 --install-with-src # Install the LSP library
cd .. # Go back to the idris2-lsp directory
make install # Install idris2-lsp

Can be installed on Windows via MSYS2.

Editor Plugins

• VSCode: idris2-lsp-vscode
• Neovim: idris2-nvim

Refer to the project wiki for editor-specific configurations.

Compile

To compile idris2-lsp you need a working installation of the Idris2 compiler (available here) and you also need the idris2api package. See the install guide how to build the idris2api package.

NOTE: The version of the Idris2 compiler available as submodule is the only tested version, we will try to keep in sync with the latest master. For specific releases of the compiler refer to the branches with the same name as the release.

Install

Run make install to install the server, by default it will be placed in the same default directory of the Idris2 compiler, i.e. ~/.idris2/bin.

Go to commands and package dependencies

The server provides support for some go to commands, e.g. go to definition, however to reach modules declared in other packages you must install packages with idris2 --install-with-src instead of idris2 --install. To access the standard library run make install-with-src-libs after building the compiler and make install-with-src-api if you also want to access to the idris2api package.

Configuration options

Server options that can be set via the initializationOptions object in the initialization message:

Option key	Type	Description
logFile	string	Absolute location of the log file for the server (default: stderr)
logSeverity	string	Logs a string with the provided severity level (default: Debug)
longActionTimeout	number	Timeout in ms for long actions, e.g. expression search (default: 5000)
maxCodeActionResults	number	Maximum number of multiple code actions for a single command, e.g. expression search (default: 5)
showImplicits	boolean	Show implicits in hovers
showMachineNames	boolean	Show machine names in hovers
fullNamespace	boolean	Show full namespace in hovers

Code Actions Filters

As per specification, client can filter requested code actions with the context.only field in the request parameters. The following table specifies the list of keys that enable each code actions. A null field enables all actions, while an empty array disables all actions.

Code Action	Allowed Keys
CaseSplit	refactor.rewrite,refactor.rewrite.CaseSplit
ExprSearch	refactor.rewrite,refactor.rewrite.ExprSearch
GenerateDef	refactor.rewrite,refactor.rewrite.GenerateDef
Intro	refactor.rewrite,refactor.rewrite.Intro
MakeCase	refactor.rewrite,refactor.rewrite.MakeCase
MakeClause	refactor.rewrite,refactor.rewrite.MakeClause
MakeLemma	refactor.extract,refactor.extract.MakeLemma
MakeWith	refactor.rewrite,refactor.rewrite.MakeWith
RefineHole	refactor.rewrite,refactor.rewrite.RefineHole

Examples

Some examples can be found in the test/lsp/example directory. Many of the existing functionality still needs to be documented.