121 lines
4.8 KiB
Org Mode
121 lines
4.8 KiB
Org Mode
#+TITLE: YCMD layer
|
||
|
||
#+TAGS: layer|tool
|
||
|
||
* Table of Contents :TOC_5_gh:noexport:
|
||
- [[#description][Description]]
|
||
- [[#features][Features:]]
|
||
- [[#install][Install]]
|
||
- [[#layer][Layer]]
|
||
- [[#ycmd][YCMD]]
|
||
- [[#other-requirements][Other Requirements]]
|
||
- [[#configuration][Configuration]]
|
||
- [[#activating-ycmd-in-a-major-mode][Activating ycmd in a major mode]]
|
||
- [[#getting-the-compilation-flags][Getting the compilation flags]]
|
||
- [[#functions][Functions]]
|
||
- [[#key-bindings][Key bindings]]
|
||
|
||
* Description
|
||
This layer adds [[https://github.com/abingham/emacs-ycmd][emacs-ycmd]] support.
|
||
|
||
** Features:
|
||
- [[https://github.com/Valloric/YouCompleteMe][YouCompleteMe]] based code-completion
|
||
- Integrations with company, flycheck, and eldoc
|
||
|
||
* Install
|
||
** Layer
|
||
To use this configuration layer, add it to your =~/.spacemacs=. You will need to
|
||
add =ycmd= to the existing =dotspacemacs-configuration-layers= list in this
|
||
file.
|
||
|
||
** YCMD
|
||
1) Install the =ycm= server. Installation instructions can be found [[https://github.com/Valloric/ycmd#user-content-building][here]].
|
||
2) Set the =ycmd-server-command= variable to reflect the path to the installation:
|
||
|
||
#+BEGIN_SRC emacs-lisp
|
||
(setq ycmd-server-command '("python" "/path/to/YouCompleteMe/third_party/ycmd/ycmd"))
|
||
#+END_SRC
|
||
|
||
Note that no filename expansions are done, so =~= -paths will not work out of the box.
|
||
If you need expansions, you can use Emacs’s =file-truename= like this:
|
||
|
||
#+BEGIN_SRC emacs-lisp
|
||
(setq ycmd-server-command (list "python" (file-truename "~/some/path")))
|
||
#+END_SRC
|
||
|
||
3) By default, spacemacs configures ycmd for getting the compilation flags from either
|
||
a compile_commands.json or a .clang_complete file and get additionnal flags from a
|
||
.ycm_extra_flags file. If you do not like this behaviour, you can write your own
|
||
[[https://github.com/Valloric/YouCompleteMe/blob/master/README.md#c-family-semantic-completion][.ycm_extra_conf.py file]]. See [[#configuration][Configuration]] for more details.
|
||
4) Whitelist the file by adding the following to =.spacemacs=:
|
||
|
||
#+BEGIN_SRC emacs-lisp
|
||
;; In this example we whitelist everything in the Develop folder
|
||
(setq ycmd-extra-conf-whitelist '("~/Develop/*"))
|
||
#+END_SRC
|
||
|
||
5) The completion is not going to work automatically until we actually force it:
|
||
|
||
#+BEGIN_SRC emacs-lisp
|
||
(setq ycmd-force-semantic-completion t)
|
||
#+END_SRC
|
||
|
||
** Other Requirements
|
||
This package requires the =auto-completion= layer in order to get actual
|
||
completion. The =syntax-checking= layer is required for flycheck support.
|
||
|
||
* Configuration
|
||
** Activating ycmd in a major mode
|
||
By default this layer only activates ycmd for =c++-mode= and =c-mode=.
|
||
|
||
If you want ycmd support in other modes you might just want to add it for
|
||
specific languages like:
|
||
|
||
#+BEGIN_SRC emacs-lisp
|
||
(add-hook 'c++-mode-hook 'ycmd-mode)
|
||
#+END_SRC
|
||
|
||
** Getting the compilation flags
|
||
Spacemacs uses its own ycmd global configuration file. If you prefer, you can
|
||
write your own [[https://github.com/Valloric/YouCompleteMe/blob/master/README.md#user-content-c-family-semantic-completion][.ycm_extra_conf.py]].
|
||
|
||
Spacemacs will search for a compile_command.json or fall back to a
|
||
.clang_complete file in all parent directories of the current translation unit.
|
||
Spacemacs will try to make up for missing files in the compile_commands.json
|
||
using heuristics described in global_conf.py.
|
||
|
||
The user can provide additionnal flags by writing a .ycm_extra_flags in any
|
||
parent directory of the current translation unit. This is particularly useful
|
||
when cross-compiling.
|
||
|
||
Example .ycm_extra_flags:
|
||
|
||
#+BEGIN_SRC conf
|
||
# Additionnal flags for ycmd
|
||
--sysroot="/path/to/your/toolchain/libc" # if you are cross-compiling
|
||
#+END_SRC
|
||
|
||
If your build system doesn’t handle the creation of a compile_commands.json,
|
||
you can use tools such as [[https://github.com/rizsotto/Bear][Bear]] or [[https://pypi.python.org/pypi/scan-build][scan-build]] to generate it, which both work
|
||
with almost any build system.
|
||
|
||
* Functions
|
||
If ~company-ycmd~ is used, then a function
|
||
~ycmd/manual-semantic-company-completer~ is defined. This function is
|
||
useful if you want to get semantic completions only when you press a
|
||
keybinding; in larger projects ycmd may not be performant for as-you-type
|
||
auto-completion to work well. You can bind it like so:
|
||
|
||
#+BEGIN_SRC emacs-lisp
|
||
(global-set-key (kbd "<C-tab>") 'ycmd/manual-semantic-company-completer)
|
||
#+END_SRC
|
||
|
||
This function will automatically cancel out of any active completers, and offer
|
||
semantic completions. It will automatically make an exception when you are
|
||
completing includes; these do not count as semantic completion so the exception
|
||
is necessary for the key binding to work when completing includes.
|
||
|
||
* Key bindings
|
||
Adds ~SPC m g g~ go to definition binding to =c++-mode= as well as ~SPC m g G~
|
||
for the more imprecise but faster version.
|