Using YCM completion in Emacs Jeff Trull 15 July 2015 Getting - - PowerPoint PPT Presentation

Using YCM completion in Emacs

Jeff Trull 15 July 2015

YouCompleteMe Jeff Trull

Getting Started with YCM

for C and C++

Download and build YCMD (a YouCompleteMe fork) https://github.com/Valloric/ycmd#building Install the ycmd and company-ycmd packages Set things up in your init file:

( eval-after-load " company-ycmd-autoloads " ’(progn ( company-ycmd-setup ))) ( eval-after-load " ycmd-autoloads " ’(progn ( set-variable ’ycmd-server-command ’("python")) ( add-to-list ’ycmd-server-command ( expand-file-name "~/ oss/emacs/ycmd/ycmd") t ) ( set-variable ’ycmd-global-config ( expand-file-name "~/ oss/emacs/ ycmd/cpp/ycm /. ycm_extra_conf . py")) (add-hook ’c++- mode-hook (lambda () (ycmd-mode) ( company-mode )))))

YouCompleteMe Jeff Trull

Test Code

Fun with namespaces

namespace Outer { struct Foo { int x, y; typedef double float_t; }; namespace Inner { struct Bar { size_t p, q; typedef char byte_t; }; } using namespace Inner; // promote Bar into Outer }

YouCompleteMe Jeff Trull

Test Code

Inheritance+Templates

struct Base { std :: string _str; }; template <typename T> struct Baz : Base , std :: enable_shared_from_this <Baz <T>> { typedef std :: vector <T> sequence_t ; // the *names* of methods

• n

this

• bject

are independent

• f T

sequence_t sequence_; std :: size_t string_length () const { // see if it knows about inherited _str whose type is independent

• f T

return _str.length (); } // see if it knows about inherited (and CRTP ’ed) shared_from_this () };

YouCompleteMe Jeff Trull

Results

CLion seems to get everything YCM struggles with dependent types within templates YCM suggests some inappropriate completions

YouCompleteMe Jeff Trull

Other good stuff

YCM supports Go and Python YCM supports Flycheck The emacs-ycm author made a couple of blog posts about writing company-mode backends that are interesting http://sixty-north.com/blog/ writing-the-simplest-emacs-company-mode-backend There is a company-clang mode but I haven’t tried it