feat(lang): add Haskell config (#2052)

lua/lazyvim/plugins/extras/lang/haskell.lua

@@ -0,0 +1,98 @@
+return {
+
+  -- Add Haskell to treesitter
+  {
+    "nvim-treesitter/nvim-treesitter",
+    opts = function(_, opts)
+      if type(opts.ensure_installed) == "table" then
+        vim.list_extend(opts.ensure_installed, { "haskell" })
+      end
+    end,
+  },
+
+  {
+    "mrcjkb/haskell-tools.nvim",
+    version = "^3",
+    ft = { 'haskell', 'lhaskell', 'cabal', 'cabalproject' },
+    dependencies = {
+      { "nvim-telescope/telescope.nvim", optional = true },
+    },
+    config = function()
+      local ok, telescope = pcall(require, 'telescope')
+      if ok then
+        telescope.load_extension('ht')
+      end
+    end,
+  },
+
+  {
+    "williamboman/mason.nvim",
+    opts = function(_, opts)
+      opts.ensure_installed = opts.ensure_installed or {}
+      vim.list_extend(opts.ensure_installed, { "haskell-language-server" })
+    end,
+  },
+
+  { 
+    "mfussenegger/nvim-dap", 
+    optional = true,
+    dependencies = {
+      {
+        "williamboman/mason.nvim",
+        opts = function(_, opts)
+          opts.ensure_installed = opts.ensure_installed or {}
+          vim.list_extend(opts.ensure_installed, { "haskell-debug-adapter" })
+        end,
+      },
+    },
+  },
+
+  {
+    "nvim-neotest/neotest",
+    optional = true,
+    dependencies = {
+      { "mrcjkb/neotest-haskell", }
+    },
+    opts = {
+      adapters = {
+        ["neotest-haskell"] = {},
+      },
+    },
+  },
+
+  {
+    "mrcjkb/haskell-snippets.nvim",
+    dependencies = { "L3MON4D3/LuaSnip", },
+    config = function()
+      local haskell_snippets = require('haskell-snippets').all
+      require('luasnip').add_snippets('haskell', haskell_snippets, { key = 'haskell' })
+    end,
+  },
+
+  {
+    "luc-tielen/telescope_hoogle",
+    ft = { 'haskell', 'lhaskell', 'cabal', 'cabalproject' },
+    dependencies = {
+      { "nvim-telescope/telescope.nvim" },
+    },
+    config = function()
+      local ok, telescope = pcall(require, 'telescope')
+      if ok then
+        telescope.load_extension('hoogle')
+      end
+    end,
+  },
+
+  -- Make sure lspconfig doesn't start hls,
+  -- as it conflicts with haskell-tools
+  {
+    "neovim/nvim-lspconfig",
+    opts = {
+      setup = {
+        hls = function()
+          return true 
+        end,
+      },
+    },
+  },
+}