Move to a profile-based configuration where common

This patch makes it so common configuration is now located in shared/
and each host basically just becomes a bunch of import statements.

The exception here is host-specific configuration like the `*.linus.onl`
that live inside `hosts/ahmed/`.

Specifically I have:

- moved common configuration `shared/{nixos,home-manager,nix-darwin}`.
- moved `hosts/common.nix` to `shared/nixos/common-{nix,shell}-settings.nix`.
- split `hosts/muhammed/{dev-utils,neovim}` into per-language
  configuration.

This patch was done in preparation for the arrival of a new host, which
will need to share a lot of configuration with Muhammed.

1 files changed, 54 insertions, 0 deletions

diff --git a/shared/home-manager/javascript/default.nix b/shared/home-manager/javascript/default.nix
new file mode 100644
index 0000000..2beaf12
--- /dev/null
+++ b/shared/home-manager/javascript/default.nix
@@ -0,0 +1,54 @@
+# This module configures development tools for JavaScript/TypeScript.
+{pkgs, ...}: {
+  home.packages = with pkgs; [
+    unstable.deno
+    unstable.nodejs_latest
+  ];
+
+  programs.neovim.extraLuaConfig = ''
+    require("lspconfig")["denols"].setup({
+      init_options = {
+        enable = true,
+        unstable = true,
+        lint = true,
+        nodeModulesDir = true,
+      },
+      cmd = { "${pkgs.unstable.deno}/bin/deno", "lsp" },
+      root_dir = function(startpath)
+        if util.find_package_json_ancestor(startpath) then
+          -- This is a Node project; let ts_ls handle this one.
+          -- This exactly mirrors how typescript-langauge-server yields to this server for Deno projects.
+          return nil
+        else
+          -- Otherwise, we try to find the root or
+          -- default to the current directory.
+          return util.root_pattern("deno.json", "deno.jsonc", ".git")(startpath)
+              or util.path.dirname(startpath)
+        end
+      end,
+    });
+
+    require("lspconfig")["ts_ls"].setup({
+      cmd = { "${pkgs.nodePackages_latest.typescript-language-server}/bin/typescript-language-server", "--stdio" },
+      root_dir = function(startpath)
+        local find_deno_root_dir = util.root_pattern("deno.json", "deno.jsonc")
+        if find_deno_root_dir(startpath) then
+          -- This is a Deno project; let deno-lsp handle this one.
+          -- This exactly mirrors how deno-lsp yields to this server for Node projects.
+          return nil
+        else
+          -- Otherwise fall back to the usual resolution method.
+          -- See: https://github.com/neovim/nvim-lspconfig/blob/056f569f71e4b726323b799b9cfacc53653bceb3/lua/lspconfig/server_configurations/ts_ls.lua#L15
+          return util.root_pattern("tsconfig.json", "jsconfig.json", "package.json", ".git")(startpath)
+        end
+      end,
+      -- We also have to disallow starting in without a root directory, as otherwise returning
+      -- nil from find_root will just cause the LSP to be spawned in single file mode instead of yielding to deno-lsp.
+      --
+      -- This has the side effect that Deno LSP will be preferred in a single file context which is what we want!
+      --
+      -- See: https://github.com/neovim/nvim-lspconfig/blob/056f569f71e4b726323b799b9cfacc53653bceb3/lua/lspconfig/manager.lua#L281-L286
+      single_file_support = false,
+    })
+  '';
+}