Neovim, refactor to use modules, lua, and LSP

Refactors the neovim config to use nix modules, and changes the plugins
to favor the builtin neovim LSP over COC. Changes all code to use lua
code instead of vimscript.

hmModules/apps/neovim/plugin/lsp.nix

@@ -0,0 +1,49 @@
+{ config, pkgs, lib, ... }:
+
+{
+  config = lib.mkIf config.neovim.enable {
+    programs.neovim.plugins = let
+      cfgp = config.neovim.plugins;
+      cfgl = config.neovim.languages;
+
+      configText = ''
+        local on_attach = function(_, bufnr)
+
+          local bufmap = function(keys, func)
+            vim.keymap.set('n', keys, func, { buffer = bufnr })
+          end
+
+          bufmap('<leader>r', vim.lsp.buf.rename)
+          bufmap('<leader>a', vim.lsp.buf.code_action)
+
+          bufmap('gd', vim.lsp.buf.definition)
+          bufmap('gD', vim.lsp.buf.declaration)
+          bufmap('gI', vim.lsp.buf.implementation)
+          bufmap('<leader>D', vim.lsp.buf.type_definition)
+
+      '' + lib.strings.optionalString cfgp.telescope.enable ''
+          bufmap('gr', require('telescope.builtin').lsp_references)
+          bufmap('<leader>s', require('telescope.builtin').lsp_document_symbols)
+          bufmap('<leader>S', require('telescope.builtin').lsp_dynamic_workspace_symbols)
+      '' + ''
+
+          bufmap('K', vim.lsp.buf.hover)
+
+          vim.api.nvim_buf_create_user_command(bufnr, 'Format', function(_)
+            vim.lsp.buf.format()
+          end, {})
+        end
+
+        local capabilities = vim.lsp.protocol.make_client_capabilities()
+      '' + lib.strings.optionalString cfgl.nix.enable ''
+        require('lspconfig').nil_ls.setup {}
+      '';
+    in with pkgs.vimPlugins; [
+      {
+        plugin = nvim-lspconfig;
+        type = "lua";
+        config = configText;
+      }
+    ];
+  };
+}

hmModules/apps/neovim/plugin/nvimcmp.nix

@@ -0,0 +1,72 @@
+{ config, pkgs, lib, ... }:
+
+let
+  cfgp = config.neovim.plugins;
+in {
+  config = lib.mkIf (config.neovim.enable && cfgp.nvimcmp.enable)  {
+    programs.neovim.plugins = let
+
+      configText = ''
+        local cmp = require('cmp')
+      '' + lib.strings.optionalString cfgp.luasnip.enable ''
+        local luasnip = require('luasnip')
+
+        require('luasnip.loaders.from_vscode').lazy_load()
+        luasnip.config.setup {}
+      '' + ''
+
+        cmp.setup {
+            mapping = cmp.mapping.preset.insert {
+                ['<C-n>'] = cmp.mapping.select_next_item(),
+                ['<C-p>'] = cmp.mapping.select_prev_item(),
+                ['<C-d>'] = cmp.mapping.scroll_docs(-4),
+                ['<C-f>'] = cmp.mapping.scroll_docs(4),
+                ['<C-Space>'] = cmp.mapping.complete {},
+                ['<CR>'] = cmp.mapping.confirm {
+                    behavior = cmp.ConfirmBehavior.Replace,
+                    select = true,
+                },
+                ['<Tab>'] = cmp.mapping(function(fallback)
+                    if cmp.visible() then
+                        cmp.select_next_item()
+      '' + lib.strings.optionalString cfgp.luasnip.enable ''
+                    elseif luasnip.expand_or_locally_jumpable() then
+                        luasnip.expand_or_jump()
+      '' + ''
+                    else
+                        fallback()
+                    end
+                end, { 'i', 's' }),
+                ['<S-Tab>'] = cmp.mapping(function(fallback)
+                    if cmp.visible() then
+                        cmp.select_prev_item()
+      '' + lib.strings.optionalString cfgp.luasnip.enable ''
+                    elseif luasnip.locally_jumpable(-1) then
+                        luasnip.jump(-1)
+      '' + ''
+                    else
+                        fallback()
+                    end
+                end, { 'i', 's' }),
+            },
+      '' + lib.strings.optionalString cfgp.luasnip.enable ''
+            snippet = {
+                expand = function(args)
+                    luasnip.lsp_expand(args.body)
+                end,
+            },
+            sources = {
+                { name = 'luasnip' },
+            },
+      '' + ''
+        }
+      '';
+    in with pkgs.vimPlugins; [
+      {
+        plugin = nvim-cmp;
+        type = "lua";
+        config = configText;
+      }
+    ];
+  };
+}

hmModules/apps/neovim/plugin/telescope.nix

@@ -0,0 +1,40 @@
+{ config, pkgs, lib, ... }:
+
+let
+  cfgp = config.neovim.plugins;
+in {
+  config = lib.mkIf (config.neovim.enable && cfgp.telescope.enable)  {
+    programs.neovim.plugins = let
+      configText = ''
+        require('telescope').setup({
+          extensions = {
+      '' + lib.strings.optionalString cfgp.telescope.fzf.enable ''
+            fzf = {
+              fuzzy = true,                    -- false will only do exact matching
+              override_generic_sorter = true,  -- override the generic sorter
+              override_file_sorter = true,     -- override the file sorter
+              case_mode = "smart_case",        -- or "ignore_case" or "respect_case"
+                                             -- the default case_mode is "smart_case"
+            }
+      '' + ''
+          }
+        })
+
+      '' + lib.strings.optionalString cfgp.telescope.fzf.enable ''
+        require('telescope').load_extension('fzf')
+      '';
+    in with pkgs.vimPlugins; [
+      {
+        plugin = telescope-nvim;
+        type = "lua";
+        config = configText;
+      }
+      (lib.mkIf cfgp.nvimcmp.enable telescope-fzf-native-nvim)
+    ];
+
+    home.packages = with pkgs; [
+      (lib.mkIf cfgp.telescope.fzf.enable fzf)
+    ];
+
+  };
+}

hmModules/apps/neovim/plugin/treesitter.nix

@@ -0,0 +1,30 @@
+{ config, pkgs, lib, ... }:
+
+let
+  cfgp = config.neovim.plugins;
+  cfgl = config.neovim.languages;
+in {
+  config = lib.mkIf (config.neovim.enable && cfgp.treesitter.enable)  {
+    programs.neovim.plugins = let
+      configText = ''
+        require('nvim-treesitter.configs').setup {
+          ensure_installed = {},
+
+          auto_install = false,
+
+          highlight = { enable = true },
+
+          indent = { enable = true },
+        }
+      '';
+
+      treeplugs = p: lib.lists.optional cfgl.nix.enable p.tree-sitter-nix;
+    in with pkgs.vimPlugins; [
+      {
+        plugin = (nvim-treesitter.withPlugins treeplugs);
+        type = "lua";
+        config = configText;
+      }
+    ];
+  };
+}