C/C++/ObjC language server ccls 0.20181225 release

https://maskray.me/blog/2018-12-25-ccls-release

新版https://github.com/MaskRay/ccls/releases/tag/0.20181225

• workspace/didChangeWatchedFiles works (tested on VSCode and coc.nvim) and file deletion will remove index symbols
• .ccls enhancement #171 added new directives %compile_commands.json %h %hpp %objective-c %objective-cpp
• -v=1 dumps commandline options of files for parsing
• fuzzy_match: when the completion filter begins with a letter, builtin macros prefixed with an underscore will not be returned
• Support textDocument/declaration and LocationLink[] return types.
• Properly handle "exit" #159
• Support signatureHelp.signatureInformationparameterInformation.labelOffsetSupport cf. https://github.com/Microsoft/language-server-protocol/issues/640
• codeAction: fixed an incompatibility issue with VSCode

Completion

• More precise diagnostics/completion: an included file that has been changed does not need to be saved to take effect.
• Decreased Content-Length: from 32K to 25K for some cases
• On clang < 8, fixed #include < completion for -I dir
• Macros are categorized as Text, instead of Interface
• Refactor and rename (clang_complete.cc -> sema_manager.cc)
• C++17 deduction guide #173

Others

• Support multiple -init=: "initializationOptions" from client are applied first, then -init=. Scalar options will be overridden while arrays will get concatenated

重是

• 更加精的 diagnostics/completion(#include 中的依 unsaved buffers)，之前 cquery/ccls 的做法都不好
• 案除、重命名：之前案都不清理掉除的案 #170
• #159 是之前 LSP exit exit(0)(中一正在 cache 的 indexer thread 下次可能不出，但非常罕)
• 全的其他大大小小改
• 如果一 textDocument 的索引未被加，request (textDocument/documentHighlight textDocument/hover等)告not indexed，示在 echo area，比人。我在pipeline.cc引入了一 backlog 解一，https://github.com/MaskRay/ccls/pull/176。code lens 可以用(add-hook 'lsp-after-open-hook #'ccls-code-lens-mode)而不需要(run-at-time 0.5 nil #'ccls-code-lens-mode)了
• 增.ccls和compile_commands.json的作， Paul Smith 的分析https://github.com/MaskRay/ccls/issues/115#issuecomment-449455357

其他

• ccls/wiki/Emacs 拆分成wiki/lsp-mode和wiki/egot，後者比陋(迎)
• eglot 支援workspace/didChangeWatchedFiles，lsp-mode 尚未
• 我 lsp-mode 加了LocationLink支援，targetSelectRange可以指向名字，而targetRange指向廓。mouse hover 可以有可效果(於 Emacs 用途不大)
• xref.el 的xref-file-location非表示interface Range的良好，因能表示(line column)，不能表示。lsp-ui-peek 需要信息 highlight 文本，法良好地用 xref 表，在 lsp-ui-peek 的有心(希望有人能改好)

;; xref.el (defclass xref-file-location (xref-location) ((file :type string :initarg :file) (line :type fixnum :initarg :line :reader xref-location-line) (column :type fixnum :initarg :column :reader xref-file-location-column)) :documentation "A file location is a file/line/column triple. Line numbers start from 1 and columns from 0.") ;; lsp-ui-peek.el (-if-let (uri (gethash "uri" x)) (-let (((&hash "start" (&hash "line" "character")) (gethash "range" x))) (lsp-ui-peek--goto-xref `(:file ,(lsp--uri-to-path uri) :line ,line :column ,character))) (-let (((&hash "start" (&hash "line" "character")) (or (gethash "targetSelectionRange" x) (gethash "targetRange" x)))) (lsp-ui-peek--goto-xref `(:file ,(lsp--uri-to-path (gethash "targetUri" x)) :line ,line :column ,character)))) 

• 非常希望看到有人能把 lsp-mode 的 hash tables+string keys ((gethash "range" xx))都改成 plists + keyword keys ((plist-get xx :range))，我感是有希望的……
• code lens 我另外也在等待 eglot 的理：https://github.com/joaotavora/eglot/pull/71，lsp-mode 中的 issue 是https://github.com/emacs-lsp/lsp-mode/issues/361