/zls

The @ziglang language server for all your Zig editor tooling needs, from autocomplete to goto-def!

Primary LanguageZigMIT LicenseMIT

Zig Language Server

CI codecov

Need support? Wanna help out? Join our Discord server!

The Zig Language Server (ZLS) is a tool that implements Microsoft's Language Server Protocol for Zig in Zig. In simpler terms: it'll provide you with completions, go-to definition, etc. when you write Zig code!

Table Of Contents

Installation

See the Installation Guide for editor and binary installation instructions.

From Source

Building ZLS is very easy. You will need a build of Zig master to build ZLS.

git clone https://github.com/zigtools/zls
cd zls
zig build -Doptimize=ReleaseSafe

Configuration Options

You can configure zls by editing your zls.json configuration file. Running zls --show-config-path will show a path to an already existing zls.json or a path to the local configuration folder instead.

zls will look for a zls.json configuration file in multiple locations with the following priority:

  • In the local configuration folder of your OS (as provided by known-folders)
  • In the global configuration folder of your OS (as provided by known-folders)

The following options are currently available.

Option Type Default value What it Does
enable_snippets bool true Enables snippet completions when the client also supports them
enable_argument_placeholders bool true Whether to enable function argument placeholder completions
enable_build_on_save bool false Whether to enable build-on-save diagnostics
build_on_save_step []const u8 "install" Select which step should be executed on build-on-save
enable_autofix bool false Whether to automatically fix errors on save. Currently supports adding and removing discards.
semantic_tokens enum .full Set level of semantic tokens. Partial only includes information that requires semantic analysis.
enable_inlay_hints bool true Enables inlay hint support when the client also supports it
inlay_hints_show_variable_type_hints bool true Enable inlay hints for variable types
inlay_hints_show_struct_literal_field_type bool true Enable inlay hints for fields in struct and union literals
inlay_hints_show_parameter_name bool true Enable inlay hints for parameter names
inlay_hints_show_builtin bool true Enable inlay hints for builtin functions
inlay_hints_exclude_single_argument bool true Don't show inlay hints for single argument calls
inlay_hints_hide_redundant_param_names bool false Hides inlay hints when parameter name matches the identifier (e.g. foo: foo)
inlay_hints_hide_redundant_param_names_last_token bool false Hides inlay hints when parameter name matches the last token of a parameter node (e.g. foo: bar.foo, foo: &foo)
warn_style bool false Enables warnings for style guideline mismatches
highlight_global_var_declarations bool false Whether to highlight global var declarations
dangerous_comptime_experiments_do_not_enable bool false Whether to use the comptime interpreter
skip_std_references bool false When true, skips searching for references in std. Improves lookup speed for functions in user's code. Renaming and go-to-definition will continue to work as is
prefer_ast_check_as_child_process bool true Favor using zig ast-check instead of ZLS's fork
builtin_path ?[]const u8 null Path to 'builtin;' useful for debugging, automatically set if let null
zig_lib_path ?[]const u8 null Zig library path, e.g. /path/to/zig/lib/zig, used to analyze std library imports
zig_exe_path ?[]const u8 null Zig executable path, e.g. /path/to/zig/zig, used to run the custom build runner. If null, zig is looked up in PATH. Will be used to infer the zig standard library path if none is provided
build_runner_path ?[]const u8 null Path to the build_runner.zig file provided by ZLS. null is equivalent to ${executable_directory}/build_runner.zig
global_cache_path ?[]const u8 null Path to a directory that will be used as zig's cache. null is equivalent to ${KnownFolders.Cache}/zls
completion_label_details bool true When false, the function signature of completion results is hidden. Improves readability in some editors

Per-build Configuration Options

The following options can be set on a per-project basis by placing zls.build.json in the project root directory next to build.zig.

Option Type Default value What it Does
relative_builtin_path ?[]const u8 null If present, this path is used to resolve @import("builtin")
build_options ?[]BuildOption null If present, this contains a list of user options to pass to the build. This is useful when options are used to conditionally add packages in build.zig.

BuildOption

BuildOption is defined as follows:

const BuildOption = struct {
    name: []const u8,
    value: ?[]const u8 = null,
};

When value is present, the option will be passed the same as in zig build -Dname=value. When value is null, the option will be passed as a flag instead as in zig build -Dflag.

Features

ZLS supports most language features, including simple type function support, using namespace, payload capture type resolution, custom packages, cImport and others. Support for comptime and semantic analysis is Work-in-Progress.

The following LSP features are supported:

  • Completions
  • Hover
  • Goto definition/declaration
  • Document symbols
  • Find references
  • Rename symbol
  • Formatting using zig fmt
  • Semantic token highlighting
  • Inlay hints
  • Code actions
  • Selection ranges
  • Folding regions

Using as a library

You can use zls as a library! Check out this demo repo for a good reference.

Related Projects

Quick Thanks :)

We'd like to take a second to thank all our awesome contributors and donators/backers/sponsors; if you have time or money to spare, consider partaking in either of these options - they help keep ZLS awesome for everyone!

OpenCollective Backers

License

MIT