use packer

lua/clangd.lua

@@ -0,0 +1,87 @@
+local util = require 'lspconfig.util'
+
+-- https://clangd.llvm.org/extensions.html#switch-between-sourceheader
+local function switch_source_header(bufnr)
+  bufnr = util.validate_bufnr(bufnr)
+  local clangd_client = util.get_active_client_by_name(bufnr, 'clangd')
+  local params = { uri = vim.uri_from_bufnr(bufnr) }
+  if clangd_client then
+    clangd_client.request('textDocument/switchSourceHeader', params, function(err, result)
+      if err then
+        error(tostring(err))
+      end
+      if not result then
+        print 'Corresponding file cannot be determined'
+        return
+      end
+      vim.api.nvim_command('edit ' .. vim.uri_to_fname(result))
+    end, bufnr)
+  else
+    print 'method textDocument/switchSourceHeader is not supported by any servers active on the current buffer'
+  end
+end
+
+local root_files = {
+  '.clangd',
+  '.clang-tidy',
+  '.clang-format',
+  'compile_commands.json',
+  'compile_flags.txt',
+  'configure.ac', -- AutoTools
+}
+
+local default_capabilities = {
+  textDocument = {
+    completion = {
+      editsNearCursor = true,
+    },
+  },
+  offsetEncoding = { 'utf-8', 'utf-16' },
+}
+
+return {
+  default_config = {
+    cmd = { 'clangd' },
+    filetypes = { 'c', 'cpp', 'objc', 'objcpp', 'cuda', 'proto' },
+    root_dir = function(fname)
+      return util.root_pattern(unpack(root_files))(fname) or util.find_git_ancestor(fname)
+    end,
+    single_file_support = true,
+    capabilities = default_capabilities,
+  },
+  commands = {
+    ClangdSwitchSourceHeader = {
+      function()
+        switch_source_header(0)
+      end,
+      description = 'Switch between source/header',
+    },
+  },
+  docs = {
+    description = [[
+https://clangd.llvm.org/installation.html
+- **NOTE:** Clang >= 11 is recommended! See [#23](https://github.com/neovim/nvim-lsp/issues/23).
+- If `compile_commands.json` lives in a build directory, you should
+  symlink it to the root of your source tree.
+  ```
+  ln -s /path/to/myproject/build/compile_commands.json /path/to/myproject/
+  ```
+- clangd relies on a [JSON compilation database](https://clang.llvm.org/docs/JSONCompilationDatabase.html)
+  specified as compile_commands.json, see https://clangd.llvm.org/installation#compile_commandsjson
+]],
+    default_config = {
+      root_dir = [[
+        root_pattern(
+          '.clangd',
+          '.clang-tidy',
+          '.clang-format',
+          'compile_commands.json',
+          'compile_flags.txt',
+          'configure.ac',
+          '.git'
+        )
+      ]],
+      capabilities = [[default capabilities, with offsetEncoding utf-8]],
+    },
+  },
+}