feat(langauges): Configure the haskell language server

lazy-lock.json

@@ -9,6 +9,7 @@
   "fd": { "branch": "master", "commit": "4d957d3a630c53fc610b4c835a1ff992f98fa49d" },
   "feline.nvim": { "branch": "main", "commit": "9f1313f61a75ec5ebe805fedd46bdc130c420963" },
   "gitsigns.nvim": { "branch": "main", "commit": "5f808b5e4fef30bd8aca1b803b4e555da07fc412" },
+  "haskell-tools.nvim": { "branch": "master", "commit": "cbfee33efb3d7252453e454d61c6b939539ea35f" },
   "idris2-nvim": { "branch": "main", "commit": "8bff02984a33264437e70fd9fff4359679d910da" },
   "lazy.nvim": { "branch": "main", "commit": "56ead98e05bb37a4ec28930a54d836d033cf00f2" },
   "mason-null-ls.nvim": { "branch": "main", "commit": "de19726de7260c68d94691afb057fa73d3cc53e7" },

lua/plugins/languages/haskell.lua

@@ -0,0 +1,46 @@
+return {
+  'mrcjkb/haskell-tools.nvim',
+  version = '^4',
+  lazy = false, -- This plugin is already lazy
+	cond = vim.fn.executable("haskell-language-server") ~= 0,
+	init = function()
+		vim.api.nvim_create_autocmd("LspAttach", {
+			group = vim.api.nvim_create_augroup("UserLspConfig", {}),
+			callback = function(ev)
+				local client = vim.lsp.get_client_by_id(ev.data.client_id)
+
+				if client ~= nil and client.name == "haskell-tools.nvim" then
+					local ht = require('haskell-tools')
+					local bufnr = ev.buf
+
+					local map = function(keys, action, desc)
+						local opts = { noremap = false, silent = true, buffer = bufnr }
+						if desc ~= nil then
+							opts.desc = desc
+						end
+						vim.keymap.set("n", keys, action, opts)
+					end
+
+					-- haskell-language-server relies heavily on codeLenses,
+					-- so auto-refresh (see advanced configuration) is enabled by default
+					map('<space>lcl', vim.lsp.codelens.run, nil)
+
+					map('<space>lhs', ht.hoogle.hoogle_signature, "Hoogle search for the type signature of the definition under the cursor")
+
+					map('<space>lea', ht.lsp.buf_eval_all, "Evaluate all code snippets")
+
+					map('<leader>lrr', ht.repl.toggle, "Toggle a GHCi repl for the current package")
+
+					-- Toggle a GHCi repl for the current buffer
+					map('<leader>lrb', function()
+					  ht.repl.toggle(vim.api.nvim_buf_get_name(0))
+					end, nil)
+
+					map('<leader>lrq', ht.repl.quit, "Quit the current GHCi repl")
+
+					vim.notify("Just done seting up hls")
+				end
+			end
+		})
+	end,
+}