1 files changed, 111 insertions, 0 deletions
diff --git a/.config/nvim/lsp/denols.lua b/.config/nvim/lsp/denols.lua
new file mode 100644
index 0000000..8c051fb
--- /dev/null
+++ b/.config/nvim/lsp/denols.lua
@@ -0,0 +1,111 @@
+---@brief
+---
+--- https://github.com/denoland/deno
+---
+--- Deno's built-in language server
+---
+--- To appropriately highlight codefences returned from denols, you will need to augment vim.g.markdown_fenced languages
+---  in your init.lua. Example:
+---
+--- ```lua
+--- vim.g.markdown_fenced_languages = {
+---   "ts=typescript"
+--- }
+--- ```
+
+local lsp = vim.lsp
+
+local function virtual_text_document_handler(uri, res, client)
+  if not res then
+    return nil
+  end
+
+  local lines = vim.split(res.result, '\n')
+  local bufnr = vim.uri_to_bufnr(uri)
+
+  local current_buf = vim.api.nvim_buf_get_lines(bufnr, 0, -1, false)
+  if #current_buf ~= 0 then
+    return nil
+  end
+
+  vim.api.nvim_buf_set_lines(bufnr, 0, -1, false, lines)
+  vim.api.nvim_set_option_value('readonly', true, { buf = bufnr })
+  vim.api.nvim_set_option_value('modified', false, { buf = bufnr })
+  vim.api.nvim_set_option_value('modifiable', false, { buf = bufnr })
+  lsp.buf_attach_client(bufnr, client.id)
+end
+
+local function virtual_text_document(uri, client)
+  local params = {
+    textDocument = {
+      uri = uri,
+    },
+  }
+  local result = client:request_sync('deno/virtualTextDocument', params)
+  virtual_text_document_handler(uri, result, client)
+end
+
+local function denols_handler(err, result, ctx, config)
+  if not result or vim.tbl_isempty(result) then
+    return nil
+  end
+
+  local client = vim.lsp.get_client_by_id(ctx.client_id)
+  for _, res in pairs(result) do
+    local uri = res.uri or res.targetUri
+    if uri:match '^deno:' then
+      virtual_text_document(uri, client)
+      res['uri'] = uri
+      res['targetUri'] = uri
+    end
+  end
+
+  lsp.handlers[ctx.method](err, result, ctx, config)
+end
+
+---@type vim.lsp.Config
+return {
+  cmd = { 'deno', 'lsp' },
+  cmd_env = { NO_COLOR = true },
+  filetypes = {
+    'javascript',
+    'javascriptreact',
+    'javascript.jsx',
+    'typescript',
+    'typescriptreact',
+    'typescript.tsx',
+  },
+  root_markers = { 'deno.json', 'deno.jsonc', '.git' },
+  settings = {
+    deno = {
+      enable = true,
+      suggest = {
+        imports = {
+          hosts = {
+            ['https://deno.land'] = true,
+          },
+        },
+      },
+    },
+  },
+  handlers = {
+    ['textDocument/definition'] = denols_handler,
+    ['textDocument/typeDefinition'] = denols_handler,
+    ['textDocument/references'] = denols_handler,
+  },
+  on_attach = function(client, bufnr)
+    vim.api.nvim_buf_create_user_command(bufnr, 'LspDenolsCache', function()
+      client:exec_cmd({
+        command = 'deno.cache',
+        arguments = { {}, vim.uri_from_bufnr(bufnr) },
+      }, { bufnr = bufnr }, function(err, _, ctx)
+        if err then
+          local uri = ctx.params.arguments[2]
+          vim.notify('cache command failed for' .. vim.uri_to_fname(uri), vim.log.levels.ERROR)
+        end
+      end)
+    end, {
+      desc = 'Cache a module and all of its dependencies.',
+    })
+  end,
+}