feat(pack): add haskell language pack (#165)

* added haskell tools

* add on_attach and extra print

* add empty input in autocmd callback

* added ddebug messages and require telescope

* add filetype loading

* remove debug messages

* add check for server_capabilities

* add astronvim.lsp.on_attach to attach lsp keymap

* cleanup and finalize readme

lua/astrocommunity/pack/haskell/README.md

@@ -0,0 +1,18 @@
+# Haskell Language Pack
+
+Requires:
+
+- plenary.nvim
+
+Optionally:
+
+- A local hoogle installation
+- [fast-tags](https://github.com/elaforge/fast-tags) (reccomended by haskell-tools)
+
+This plugin pack does the following:
+
+- Adds `haskell` treesitter parsers
+- Adds `haskell-language-server` language server
+- Adds [haskell-tools.nvim](https://github.com/mrcjkb/haskell-tools.nvim)
+- Adds `yaml` language pack
+- Adds `json` language pack

lua/astrocommunity/pack/haskell/haskell.lua

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+local utils = require "astrocommunity.utils"
+return {
+  { import = "astrocommunity.pack.yaml" }, -- stack.yaml
+  { import = "astrocommunity.pack.json" }, -- hls.json
+  {
+    "nvim-treesitter/nvim-treesitter",
+    opts = function(_, opts)
+      -- Ensure that opts.ensure_installed exists and is a table or string "all".
+      if not opts.ensure_installed then
+        opts.ensure_installed = {}
+      elseif opts.ensure_installed == "all" then
+        return
+      end
+      -- ensure haskell treesitter installed
+      utils.list_insert_unique(opts.ensure_installed, "haskell")
+    end,
+  },
+  {
+    "mrcjkb/haskell-tools.nvim",
+    ft = { "haskell" },
+    branch = "1.x.x", -- reccomended by haskell-tools
+    init = function() utils.list_insert_unique(astronvim.lsp.skip_setup, "hls") end,
+    opts = {
+      hls = {
+        on_attach = function(client, bufnr) require("astronvim.utils.lsp").on_attach(client, bufnr) end,
+      },
+    },
+    config = function(_, opts)
+      vim.api.nvim_create_autocmd("Filetype", {
+        pattern = "haskell", -- autocmd to start haskell-tools
+        callback = function(_) require("haskell-tools").start_or_attach(opts) end,
+      })
+    end,
+    dependencies = {
+      "nvim-lua/plenary.nvim",
+      "nvim-telescope/telescope.nvim", -- optional
+      -- TODO: Need haskell to be pulled into mason-nvim-dap (haskell hopefully coming soon)
+      -- {
+      --   "jay-babu/mason-nvim-dap.nvim",
+      --   opts = function(_, opts)
+      --     -- Ensure that opts.ensure_installed exists and is a table.
+      --     if not opts.ensure_installed then opts.ensure_installed = {} end
+      --     utils.list_insert_unique(opts.ensure_installed, "haskell-dap")
+      --   end,
+      -- },
+    },
+  },
+  {
+    "williamboman/mason-lspconfig.nvim",
+    opts = function(_, opts)
+      -- Ensure that opts.ensure_installed exists and is a table.
+      if not opts.ensure_installed then opts.ensure_installed = {} end
+      utils.list_insert_unique(opts.ensure_installed, "hls")
+    end,
+  },
+}