home: vim: lspconfig: simplify LSP config

Despite what I just said in the previous commit, I decided to remove the
`is_executable` checks and always enable all servers.

I figured out that NeoVim actually handles `PATH` modifications pretty
well in this scenario: making a previously unavailable server executable
will automatically enable it.

modules/home/vim/plugin/settings/lspconfig.lua

@@ -1,4 +1,3 @@
-local lspconfig = require("lspconfig")
 local lsp = require("ambroisie.lsp")
 local utils = require("ambroisie.utils")
 
@@ -25,59 +24,27 @@ vim.diagnostic.config({
 -- Inform servers we are able to do completion, snippets, etc...
 local capabilities = require("cmp_nvim_lsp").default_capabilities()
 
--- C/C++
-if utils.is_executable("clangd") then
-    lspconfig.clangd.setup({
-        capabilities = capabilities,
-        on_attach = lsp.on_attach,
-    })
-end
+-- Shared configuration
+vim.lsp.config("*", {
+    capabilities = capabilities,
+    on_attach = lsp.on_attach,
+})
 
--- Haskell
-if utils.is_executable("haskell-language-server-wrapper") then
-    lspconfig.hls.setup({
-        capabilities = capabilities,
-        on_attach = lsp.on_attach,
-    })
-end
-
--- Nix
-if utils.is_executable("nil") then
-    lspconfig.nil_ls.setup({
-        capabilities = capabilities,
-        on_attach = lsp.on_attach,
-    })
-end
-
--- Python
-if utils.is_executable("pyright") then
-    lspconfig.pyright.setup({
-        capabilities = capabilities,
-        on_attach = lsp.on_attach,
-    })
-end
-
-if utils.is_executable("ruff") then
-    lspconfig.ruff.setup({
-        capabilities = capabilities,
-        on_attach = lsp.on_attach,
-    })
-end
-
--- Rust
-if utils.is_executable("rust-analyzer") then
-    lspconfig.rust_analyzer.setup({
-        capabilities = capabilities,
-        on_attach = lsp.on_attach,
-    })
-end
-
--- Shell
-if utils.is_executable("bash-language-server") then
-    lspconfig.bashls.setup({
+local servers = {
+    -- C/C++
+    clangd = {},
+    -- Haskell
+    hls = {},
+    -- Nix
+    nil_ls = {},
+    -- Python
+    pyright = {},
+    ruff = {},
+    -- Rust
+    rust_analyzer = {},
+    -- Shell
+    bashls = {
         filetypes = { "bash", "sh", "zsh" },
-        capabilities = capabilities,
-        on_attach = lsp.on_attach,
         settings = {
             bashIde = {
                 shfmt = {
@@ -88,28 +55,17 @@ if utils.is_executable("bash-language-server") then
                 },
             },
         },
-    })
-end
+    },
+    -- Starlark
+    starpls = {},
+    -- Generic
+    harper_ls = {},
+    typos_lsp = {},
+}
 
--- Starlark
-if utils.is_executable("starpls") then
-    lspconfig.starpls.setup({
-        capabilities = capabilities,
-        on_attach = lsp.on_attach,
-    })
-end
-
--- Generic
-if utils.is_executable("harper-ls") then
-    lspconfig.harper_ls.setup({
-        capabilities = capabilities,
-        on_attach = lsp.on_attach,
-    })
-end
-
-if utils.is_executable("typos-lsp") then
-    lspconfig.typos_lsp.setup({
-        capabilities = capabilities,
-        on_attach = lsp.on_attach,
-    })
+for server, config in pairs(servers) do
+    if not vim.tbl_isempty(config) then
+        vim.lsp.config(server, config)
+    end
+    vim.lsp.enable(server)
 end