add(nvim): haskell LSP and formatter

.config/nvim/after/plugin/lsp.lua

@@ -161,6 +161,12 @@ require "lspconfig".metals.setup {
 require "lspconfig".hls.setup {
 	on_attach = on_attach,
 	capabilities = capabilities,
+	settings = {
+		haskell = {
+			cabalFormattingProvider = "cabalfmt",
+			formattingProvider = "fourmolu"
+		}
+	}
 }
 -- Python
 require "lspconfig".pylsp.setup {

.config/nvim/snippets/package.json

@@ -2,6 +2,10 @@
 	"name": "leana-snippets",
 	"contributes": {
 		"snippets": [
+			{
+				"language": "haskell",
+				"path": "./haskell.json"
+			},
 			{
 				"language": "scala",
 				"path": "./scala.json"