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languages/csharp: add razor support #1271

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6 changes: 6 additions & 0 deletions docs/manual/release-notes/rl-0.9.md
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Original file line number Diff line number Diff line change
Expand Up @@ -144,3 +144,9 @@
[Machshev](https://github.com/machshev):

- Added `ruff` and `ty` LSP support for Python under `programs.python`.

[CaueAnjos](https://github.com/CaueAnjos):

- Add razor support for C# language
- Breaking changes:
- `roslyn_ls` changed to `roslyn`
127 changes: 69 additions & 58 deletions modules/plugins/languages/csharp.nix
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Original file line number Diff line number Diff line change
Expand Up @@ -24,10 +24,8 @@
in
optionalString (key != null) "vim.keymap.set('n', '${key}', ${action}, {buffer=bufnr, noremap=true, silent=true, desc='${desc}'})";

# Omnisharp doesn't have colors in popup docs for some reason, and I've also
# seen mentions of it being way slower, so until someone finds missing
# functionality, this will be the default.
defaultServers = ["csharp_ls"];
# roslyn is the official language server and the most feature-rich
defaultServers = ["roslyn"];
servers = {
omnisharp = {
cmd = mkLuaInline ''
Expand All @@ -43,19 +41,7 @@
}
'';
filetypes = ["cs" "vb"];
root_dir = mkLuaInline ''
function(bufnr, on_dir)
local function find_root_pattern(fname, lua_pattern)
return vim.fs.root(0, function(name, path)
return name:match(lua_pattern)
end)
end

local fname = vim.api.nvim_buf_get_name(bufnr)
on_dir(find_root_pattern(fname, "%.sln$") or find_root_pattern(fname, "%.csproj$"))
end
'';
init_options = {};
root_marks = [".sln" ".csproj"];
capabilities = {
workspace = {
workspaceFolders = false; # https://github.com/OmniSharp/omnisharp-roslyn/issues/909
Expand Down Expand Up @@ -120,65 +106,65 @@
csharp_ls = {
cmd = [(lib.getExe pkgs.csharp-ls)];
filetypes = ["cs"];
root_dir = mkLuaInline ''
function(bufnr, on_dir)
local function find_root_pattern(fname, lua_pattern)
return vim.fs.root(0, function(name, path)
return name:match(lua_pattern)
end)
end

local fname = vim.api.nvim_buf_get_name(bufnr)
on_dir(find_root_pattern(fname, "%.sln$") or find_root_pattern(fname, "%.csproj$"))
end
'';
root_marks = [".sln" ".csproj"];
init_options = {
AutomaticWorkspaceInit = true;
};
};

roslyn_ls = {
cmd = mkLuaInline ''
{
${toLuaObject (getExe pkgs.roslyn-ls)},
'--logLevel=Warning',
'--extensionLogDirectory=' .. vim.fs.dirname(vim.lsp.get_log_path()),
'--stdio',
}
'';

filetypes = ["cs"];
root_dir = mkLuaInline ''
function(bufnr, on_dir)
local function find_root_pattern(fname, lua_pattern)
return vim.fs.root(0, function(name, path)
return name:match(lua_pattern)
end)
end

local fname = vim.api.nvim_buf_get_name(bufnr)
on_dir(find_root_pattern(fname, "%.sln$") or find_root_pattern(fname, "%.csproj$"))
end
'';
init_options = {};
roslyn = {
# NOTE: cmd is set by roslyn-nvim!
filetypes = ["cs" "razor" "cshtml"];
root_marks = [".sln" ".csproj"];
};
};

extraServerPlugins = {
omnisharp = ["omnisharp-extended-lsp-nvim"];
csharp_ls = ["csharpls-extended-lsp-nvim"];
roslyn_ls = [];
roslyn = ["roslyn-nvim"];
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@horriblename horriblename Dec 19, 2025

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this is technically a breaking change, a warning about removal of "roslyn_ls" in lsp.servers would be nice

};

defaultRazorExtension = "vscode-csharp";
razorExtensions = let
packageExtension = pkg: path:
pkgs.stdenv.mkDerivation {
name = "${pkg.pname}_razor-extension";
inherit (pkg) version;
src = pkg;
installPhase = ''
mkdir -p $out/packages/{roslyn,roslyn-unstable}/libexec
cp -r $src/${path} $out/packages/roslyn/libexec/.razorExtension
cp -r $src/${path} $out/packages/roslyn-unstable/libexec/.razorExtension
'';
};
in {
vscode-csharp =
packageExtension pkgs.vscode-extensions.ms-dotnettools.csharp "share/vscode/extensions/ms-dotnettools.csharp/.razorExtension";
};

cfg = config.vim.languages.csharp;
in {
options = {
vim.languages.csharp = {
enable = mkEnableOption "C# language support";
enable = mkEnableOption ''
C# language support.

::: {.note}
It's worth noting that this support will not work if the .NET SDK is not installed.
`roslyn` requires the .NET SDK 10 to work properly with Razor.
`csharp_ls` and `omnisharp` require the .NET SDK 9. I strongly recommend using the most recent version available.
:::

::: {.warning}
At the moment, only `roslyn` supports Razor.
:::
'';

treesitter = {
enable = mkEnableOption "C# treesitter" // {default = config.vim.languages.enableTreesitter;};
package = mkGrammarOption pkgs "c_sharp";
enable = mkEnableOption "C#/razor treesitter" // {default = config.vim.languages.enableTreesitter;};
csPackage = mkGrammarOption pkgs "c_sharp";
razorPackage = mkGrammarOption pkgs "razor";
};

lsp = {
Expand All @@ -188,18 +174,43 @@ in {
type = deprecatedSingleOrListOf "vim.language.csharp.lsp.servers" (enum (attrNames servers));
default = defaultServers;
};

razorExtension = mkOption {
description = ''
razor extensions package to use

::: {.warning}
At the moment, only `roslyn` supports Razor;
therefore, this option is effective only when `roslyn` is selected.
:::
'';
type = enum (attrNames razorExtensions);
default = defaultRazorExtension;
};
};
};
};

config = mkIf cfg.enable (mkMerge [
(mkIf cfg.treesitter.enable {
vim.treesitter.enable = true;
vim.treesitter.grammars = [cfg.treesitter.package];
vim.treesitter.grammars = [cfg.treesitter.csPackage cfg.treesitter.razorPackage];
})

(mkIf (cfg.lsp.enable && lib.elem "roslyn" cfg.lsp.servers)
{
vim.extraPackages = [pkgs.roslyn-ls pkgs.vscode-langservers-extracted];

# NOTE: roslyn-nvim requires razorExtension dll's
# See: https://github.com/seblyng/roslyn.nvim/blob/main/lua/roslyn/health.lua
vim.luaConfigRC.razorExtension = ''
vim.env.MASON = "${razorExtensions.${cfg.lsp.razorExtension}}"
'';
})

(mkIf cfg.lsp.enable {
vim.startPlugins = concatMap (server: extraServerPlugins.${server}) cfg.lsp.servers;

vim.lsp.servers =
mapListToAttrs (name: {
inherit name;
Expand Down
13 changes: 13 additions & 0 deletions npins/sources.json
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Original file line number Diff line number Diff line change
Expand Up @@ -2389,6 +2389,19 @@
"url": "https://github.com/rose-pine/neovim/archive/72a04c4065345b51b56aed4859ea1d884f734097.tar.gz",
"hash": "sha256-CAPZaKFR/WcLW/NW9FNG3jJDnNgzLuwJP+I43ppzkpA="
},
"roslyn-nvim": {
"type": "Git",
"repository": {
"type": "GitHub",
"owner": "seblyng",
"repo": "roslyn.nvim"
},
"branch": "main",
"submodules": false,
"revision": "2b9a8366a29b0a2a7e51cac87f3ca6345f617790",
"url": "https://github.com/seblyng/roslyn.nvim/archive/2b9a8366a29b0a2a7e51cac87f3ca6345f617790.tar.gz",
"hash": "sha256-SdrfPStzmmOiYPhOnanM+GB+Ox6g9jhb5Ks5qxWLIAU="
},
"rtp-nvim": {
"type": "Git",
"repository": {
Expand Down
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