lsp/presets/phan: init

modules/plugins/lsp/presets/default.nix

@@ -4,6 +4,7 @@
     ./deno.nix
     ./harper.nix
     ./lemminx.nix
+    ./phan.nix
     ./phpactor.nix
     ./pyrefly.nix
     ./pyright.nix

modules/plugins/lsp/presets/phan.nix

@@ -0,0 +1,45 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}: let
+  inherit (lib.meta) getExe;
+  inherit (lib.modules) mkIf;
+  inherit (lib.options) mkEnableOption;
+  inherit (lib.generators) mkLuaInline;
+
+  cfg = config.vim.lsp.presets.phan;
+in {
+  options.vim.lsp.presets.phan = {
+    enable = mkEnableOption "the Phan Language Server";
+  };
+
+  config = mkIf cfg.enable {
+    vim.lsp.servers.phan = {
+      enable = true;
+      cmd = [
+        (getExe pkgs.php85Packages.phan)
+        "-m"
+        "json"
+        "--no-color"
+        "--no-progress-bar"
+        "-x"
+        "-u"
+        "-S"
+        "--language-server-on-stdin"
+        "--allow-polyfill-parser"
+      ];
+      root_dir = mkLuaInline ''
+        function(bufnr, on_dir)
+          local fname = vim.api.nvim_buf_get_name(bufnr)
+          local cwd = assert(vim.uv.cwd())
+          local root = vim.fs.root(fname, { 'composer.json', '.git' })
+
+          -- prefer cwd if root is a descendant
+          on_dir(root and vim.fs.relpath(cwd, root) and cwd)
+        end
+      '';
+    };
+  };
+}