# Installs and configures lspconfig. The actual LSPs are added in the per-language profiles.
{pkgs, ...}: {
  programs.neovim.plugins = [
    {
      plugin = pkgs.vimPlugins.nvim-lspconfig;
      type = "lua";
      config = ''
        local lspconfig = require("lspconfig")
        local util = require("lspconfig.util")

        -- Mappings.
        -- See `:help vim.diagnostic.*` for documentation on any of the below functions
        local opts = { noremap=true, silent=true }
        vim.keymap.set('n', '<leader>e', vim.diagnostic.open_float, opts)
        vim.keymap.set('n', '[d', vim.diagnostic.goto_prev, opts)
        vim.keymap.set('n', ']d', vim.diagnostic.goto_next, opts)
        vim.keymap.set('n', '<leader>q', vim.diagnostic.setloclist, opts)

        -- Use an on_attach function to only map the following keys
        -- after the language server attaches to the current buffer
        vim.api.nvim_create_autocmd("LspAttach", {
          callback = function(args)
            local bufnr = args.buf
            local client = vim.lsp.get_client_by_id(args.data.client_id)

            -- Enable completion triggered by <c-x><c-o>
            if client.server_capabilities.completionProvider then
              vim.bo[bufnr].omnifunc = "v:lua.vim.lsp.omnifunc"
            end

            -- XXX: What does this do?
            if client.server_capabilities.definitionProvider then
              vim.bo[bufnr].tagfunc = "v:lua.vim.lsp.tagfunc"
            end

            -- Mappings.
            -- See `:help vim.lsp.*` for documentation on any of the below functions
            local bufopts = { noremap=true, silent=true, buffer=bufnr }
            vim.keymap.set('n', 'gD', vim.lsp.buf.declaration, bufopts)
            vim.keymap.set('n', 'gd', vim.lsp.buf.definition, bufopts)
            vim.keymap.set('n', 'K', vim.lsp.buf.hover, bufopts)
            vim.keymap.set('n', 'gi', vim.lsp.buf.implementation, bufopts)
            vim.keymap.set('n', '<C-k>', vim.lsp.buf.signature_help, bufopts)
            vim.keymap.set('n', '<leader>wa', vim.lsp.buf.add_workspace_folder, bufopts)
            vim.keymap.set('n', '<leader>wr', vim.lsp.buf.remove_workspace_folder, bufopts)
            vim.keymap.set('n', '<leader>wl', function()
              print(vim.inspect(vim.lsp.buf.list_workspace_folders()))
            end, bufopts)
            vim.keymap.set('n', '<leader>D', vim.lsp.buf.type_definition, bufopts)
            vim.keymap.set('n', '<leader>rn', vim.lsp.buf.rename, bufopts)
            vim.keymap.set('n', '<leader>ca', vim.lsp.buf.code_action, bufopts)
            vim.keymap.set('n', 'gr', vim.lsp.buf.references, bufopts)
            vim.keymap.set('n', '<leader>f', function() vim.lsp.buf.format { async = true } end, bufopts)
          end,
        })
      '';
    }
  ];
}