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youcompleteme.txt
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*youcompleteme* YouCompleteMe: a code-completion engine for Vim
===============================================================================
Contents ~
1. Introduction |youcompleteme-introduction|
2. Intro |youcompleteme-intro|
3. Installation |youcompleteme-installation|
1. Mac OS X |youcompleteme-mac-os-x|
2. Ubuntu Linux x64 |youcompleteme-ubuntu-linux-x64|
3. Fedora Linux x64 |youcompleteme-fedora-linux-x64|
4. Windows |youcompleteme-windows|
5. FreeBSD/OpenBSD |youcompleteme-freebsd-openbsd|
6. Full Installation Guide |youcompleteme-full-installation-guide|
4. Quick Feature Summary |youcompleteme-quick-feature-summary|
1. General (all languages) |youcompleteme-general|
2. C-family languages (C, C++, Objective C, Objective C++) |youcompleteme-c-family-languages|
3. C♯ |youcompleteme-c|
4. Python |youcompleteme-python|
5. Go |youcompleteme-go|
6. TypeScript |youcompleteme-typescript|
7. JavaScript |youcompleteme-javascript|
8. Rust |youcompleteme-rust|
5. User Guide |youcompleteme-user-guide|
1. General Usage |youcompleteme-general-usage|
2. Client-Server Architecture |youcompleteme-client-server-architecture|
3. Completion String Ranking |youcompleteme-completion-string-ranking|
4. General Semantic Completion |youcompleteme-general-semantic-completion|
5. C-family Semantic Completion |youcompleteme-c-family-semantic-completion|
6. JavaScript Semantic Completion |youcompleteme-javascript-semantic-completion|
1. Quick start |youcompleteme-quick-start|
2. Explanation |youcompleteme-explanation|
3. Tips and tricks |youcompleteme-tips-tricks|
1. Configuring Tern for node support |youcompleteme-configuring-tern-for-node-support|
2. Configuring Tern for requirejs support |youcompleteme-configuring-tern-for-requirejs-support|
7. Rust Semantic Completion |youcompleteme-rust-semantic-completion|
8. Python Semantic Completion |youcompleteme-python-semantic-completion|
9. Semantic Completion for Other Languages |youcompleteme-semantic-completion-for-other-languages|
10. Writing New Semantic Completers |youcompleteme-writing-new-semantic-completers|
11. Diagnostic Display |youcompleteme-diagnostic-display|
1. Diagnostic Highlighting Groups |youcompleteme-diagnostic-highlighting-groups|
6. Commands |youcompleteme-commands|
1. The |:YcmRestartServer| command
2. The |:YcmForceCompileAndDiagnostics| command
3. The |:YcmDiags| command
4. The |:YcmShowDetailedDiagnostic| command
5. The |:YcmDebugInfo| command
6. The |:YcmToggleLogs| command
7. The |:YcmCompleter| command
7. YcmCompleter Subcommands |youcompleteme-ycmcompleter-subcommands|
1. GoTo Commands |youcompleteme-goto-commands|
1. The |GoToInclude| subcommand
2. The |GoToDeclaration| subcommand
3. The |GoToDefinition| subcommand
4. The |GoTo| subcommand
5. The |GoToImprecise| subcommand
6. The |GoToReferences| subcommand
7. The |GoToImplementation| subcommand
8. The |GoToImplementationElseDeclaration| subcommand
2. Semantic Information Commands |youcompleteme-semantic-information-commands|
1. The |GetType| subcommand
2. The |GetTypeImprecise| subcommand
3. The |GetParent| subcommand
4. The |GetDoc| subcommand
5. The |GetDocImprecise| subcommand
3. Refactoring and FixIt Commands |youcompleteme-refactoring-fixit-commands|
1. The |FixIt| subcommand
2. The 'RefactorRename <new name>' subcommand |RefactorRename-new-name|
3. Multi-file Refactor |youcompleteme-multi-file-refactor|
4. Miscellaneous Commands |youcompleteme-miscellaneous-commands|
1. The |RestartServer| subcommand
2. The |ClearCompilationFlagCache| subcommand
3. The |ReloadSolution| subcommand
8. Functions |youcompleteme-functions|
1. The |youcompleteme#GetErrorCount| function
2. The |youcompleteme#GetWarningCount| function
9. Autocommands |youcompleteme-autocommands|
1. The |YcmQuickFixOpened| autocommand
10. Options |youcompleteme-options|
1. The |g:ycm_min_num_of_chars_for_completion| option
2. The |g:ycm_min_num_identifier_candidate_chars| option
3. The |g:ycm_auto_trigger| option
4. The |g:ycm_filetype_whitelist| option
5. The |g:ycm_filetype_blacklist| option
6. The |g:ycm_filetype_specific_completion_to_disable| option
7. The |g:ycm_show_diagnostics_ui| option
8. The |g:ycm_error_symbol| option
9. The |g:ycm_warning_symbol| option
10. The |g:ycm_enable_diagnostic_signs| option
11. The |g:ycm_enable_diagnostic_highlighting| option
12. The |g:ycm_echo_current_diagnostic| option
13. The |g:ycm_filter_diagnostics| option
14. The |g:ycm_always_populate_location_list| option
15. The |g:ycm_open_loclist_on_ycm_diags| option
16. The |g:ycm_allow_changing_updatetime| option
17. The |g:ycm_complete_in_comments| option
18. The |g:ycm_complete_in_strings| option
19. The |g:ycm_collect_identifiers_from_comments_and_strings| option
20. The |g:ycm_collect_identifiers_from_tags_files| option
21. The |g:ycm_seed_identifiers_with_syntax| option
22. The |g:ycm_extra_conf_vim_data| option
23. The |g:ycm_server_python_interpreter| option
24. The |g:ycm_keep_logfiles| option
25. The |g:ycm_log_level| option
26. The |g:ycm_auto_start_csharp_server| option
27. The |g:ycm_auto_stop_csharp_server| option
28. The |g:ycm_csharp_server_port| option
29. The |g:ycm_csharp_insert_namespace_expr| option
30. The |g:ycm_add_preview_to_completeopt| option
31. The |g:ycm_autoclose_preview_window_after_completion| option
32. The |g:ycm_autoclose_preview_window_after_insertion| option
33. The |g:ycm_max_diagnostics_to_display| option
34. The |g:ycm_key_list_select_completion| option
35. The |g:ycm_key_list_previous_completion| option
36. The |g:ycm_key_invoke_completion| option
37. The |g:ycm_key_detailed_diagnostics| option
38. The |g:ycm_global_ycm_extra_conf| option
39. The |g:ycm_confirm_extra_conf| option
40. The |g:ycm_extra_conf_globlist| option
41. The |g:ycm_filepath_completion_use_working_dir| option
42. The |g:ycm_semantic_triggers| option
43. The |g:ycm_cache_omnifunc| option
44. The |g:ycm_use_ultisnips_completer| option
45. The |g:ycm_goto_buffer_command| option
46. The |g:ycm_disable_for_files_larger_than_kb| option
47. The |g:ycm_python_binary_path| option
11. FAQ |youcompleteme-faq|
1. I used to be able to 'import vim' in '.ycm_extra_conf.py', but now can't |import-vim|
2. On very rare occasions Vim crashes when I tab through the completion menu |youcompleteme-on-very-rare-occasions-vim-crashes-when-i-tab-through-completion-menu|
3. I get |ImportError| exceptions that mention 'PyInit_ycm_core' or 'initycm_core'
4. I get a linker warning regarding |libpython| on Mac when compiling YCM
5. I get a weird window at the top of my file when I use the semantic engine |youcompleteme-i-get-weird-window-at-top-of-my-file-when-i-use-semantic-engine|
6. It appears that YCM is not working |youcompleteme-it-appears-that-ycm-is-not-working|
7. Sometimes it takes much longer to get semantic completions than normal |youcompleteme-sometimes-it-takes-much-longer-to-get-semantic-completions-than-normal|
8. YCM auto-inserts completion strings I don't want! |youcompleteme-ycm-auto-inserts-completion-strings-i-dont-want|
9. I get a 'E227: mapping already exists for <blah>' error when I start Vim |E227:-mapping-already-exists-for-blah|
10. I get "'GLIBC_2.XX' not found (required by libclang.so)" when starting Vim |GLIBC_2.XX-not-found()|
11. I'm trying to use a Homebrew Vim with YCM and I'm getting segfaults |youcompleteme-im-trying-to-use-homebrew-vim-with-ycm-im-getting-segfaults|
12. I have a Homebrew Python and/or MacVim; can't compile/SIGABRT when starting |youcompleteme-i-have-homebrew-python-and-or-macvim-cant-compile-sigabrt-when-starting|
13. I get 'LONG_BIT definition appears wrong for platform' when compiling |LONG_BIT-definition-appears-wrong-for-platform|
14. I get 'libpython2.7.a [...] relocation R_X86_64_32' when compiling |libpython2.7.a-...-relocation-R_X86_64_32|
15. I get 'Vim: Caught deadly signal SEGV' on Vim startup |Vim:-Caught-deadly-signal-SEGV|
16. I get 'Fatal Python error: PyThreadState_Get: no current thread' on startup |Fatal-Python-error:-PyThreadState_Get:-no-current-thread|
17. |install.py| says python must be compiled with '--enable-framework'. Wat?
18. YCM does not read identifiers from my tags files |youcompleteme-ycm-does-not-read-identifiers-from-my-tags-files|
19. 'CTRL-U' in insert mode does not work |CTRL-sub-U|
20. YCM conflicts with UltiSnips TAB key usage |youcompleteme-ycm-conflicts-with-ultisnips-tab-key-usage|
21. Snippets added with |:UltiSnipsAddFiletypes| do not appear in the popup menu
22. Why isn't YCM just written in plain VimScript, FFS? |youcompleteme-why-isnt-ycm-just-written-in-plain-vimscript-ffs|
23. Why does YCM demand such a recent version of Vim? |youcompleteme-why-does-ycm-demand-such-recent-version-of-vim|
24. I get annoying messages in Vim's status area when I type |youcompleteme-i-get-annoying-messages-in-vims-status-area-when-i-type|
25. Nasty bugs happen if I have the 'vim-autoclose' plugin installed |vim-sub-autoclose|
26. Is there some sort of YCM mailing list? I have questions |youcompleteme-is-there-sort-of-ycm-mailing-list-i-have-questions|
27. I get an internal compiler error when installing |youcompleteme-i-get-an-internal-compiler-error-when-installing|
28. I get weird errors when I press 'Ctrl-C' in Vim |Ctrl-sub-C|
29. Why did YCM stop using Syntastic for diagnostics display? |youcompleteme-why-did-ycm-stop-using-syntastic-for-diagnostics-display|
30. Completion doesn't work with the C++ standard library headers |youcompleteme-completion-doesnt-work-with-c-standard-library-headers|
31. When I open a JavaScript file, I get an annoying warning about '.tern-project'
file |.tern-sub-project|
32. When I start vim I get a runtime error saying 'R6034 An application has made an
attempt to load the C runtime library incorrectly.' |R6034-An-application-has-made-an-attempt-to-load-the-C-runtime-library-incorrectly.|
33. I hear that YCM only supports Python 2, is that true? |youcompleteme-i-hear-that-ycm-only-supports-python-2-is-that-true|
34. On Windows I get "E887: Sorry, this command is disabled, the Python's site
module could not be loaded" |E887:-Sorry-this-command-is-disabled-the-Python-s-site-module-could-not-be-loaded|
35. I can't complete python packages in a virtual environment. |youcompleteme-i-cant-complete-python-packages-in-virtual-environment.|
12. Contributor Code of Conduct |youcompleteme-contributor-code-of-conduct|
13. Contact |youcompleteme-contact|
14. License |youcompleteme-license|
15. References |youcompleteme-references|
===============================================================================
*youcompleteme-introduction*
Introduction ~
Image: Gitter Room [1] Image: Build Status [3] Image: Build status [5] Image:
Coverage Status [7]
- Intro
- Installation
- Mac OS X
- Ubuntu Linux x64
- Fedora Linux x64
- Windows
- FreeBSD/OpenBSD
- Full Installation Guide
- Quick Feature Summary
- User Guide
- General Usage
- Client-Server Architecture
- Completion String Ranking
- General Semantic Completion
- C-family Semantic Completion
- JavaScript Semantic Completion
- Rust Semantic Completion
- Python Semantic Completion
- Semantic Completion for Other Languages
- Writing New Semantic Completers
- Diagnostic Display
- Diagnostic Highlighting Groups
- Commands
- YcmCompleter subcommands
- GoTo Commands
- Semantic Information Commands
- Refactoring and FixIt Commands
- Miscellaneous Commands
- Functions
- Autocommands
- Options
- FAQ
- Contributor Code of Conduct
- Contact
- License
===============================================================================
*youcompleteme-intro*
Intro ~
YouCompleteMe is a fast, as-you-type, fuzzy-search code completion engine for
Vim. It has several completion engines:
- an identifier-based engine that works with every programming language,
- a Clang [9]-based engine that provides native semantic code completion for
C/C++/Objective-C/Objective-C++ (from now on referred to as "the C-family
languages"),
- a Jedi [10]-based completion engine for Python 2 and 3 (using the JediHTTP
[11] wrapper),
- an OmniSharp [12]-based completion engine for C#,
- a combination of Gocode [13] and Godef [14] semantic engines for Go,
- a TSServer [15]-based completion engine for TypeScript,
- a Tern [16]-based completion engine for JavaScript,
- a racer [17]-based completion engine for Rust,
- and an omnifunc-based completer that uses data from Vim's omnicomplete
system to provide semantic completions for many other languages (Ruby, PHP
etc.).
Image: YouCompleteMe GIF demo (see reference [18])
Here's an explanation of what happens in the short GIF demo above.
First, realize that **no keyboard shortcuts had to be pressed** to get the list
of completion candidates at any point in the demo. The user just types and the
suggestions pop up by themselves. If the user doesn't find the completion
suggestions relevant and/or just wants to type, they can do so; the completion
engine will not interfere.
When the user sees a useful completion string being offered, they press the TAB
key to accept it. This inserts the completion string. Repeated presses of the
TAB key cycle through the offered completions.
If the offered completions are not relevant enough, the user can continue
typing to further filter out unwanted completions.
A critical thing to notice is that the completion **filtering is NOT based on
the input being a string prefix of the completion** (but that works too). The
input needs to be a _subsequence [19] match_ of a completion. This is a fancy
way of saying that any input characters need to be present in a completion
string in the order in which they appear in the input. So 'abc' is a
subsequence of 'xaybgc', but not of 'xbyxaxxc'. After the filter, a complicated
sorting system ranks the completion strings so that the most relevant ones rise
to the top of the menu (so you usually need to press TAB just once).
**All of the above works with any programming language** because of the
identifier-based completion engine. It collects all of the identifiers in the
current file and other files you visit (and your tags files) and searches them
when you type (identifiers are put into per-filetype groups).
The demo also shows the semantic engine in use. When the user presses '.', '->'
or '::' while typing in insert mode (for C++; different triggers are used for
other languages), the semantic engine is triggered (it can also be triggered
with a keyboard shortcut; see the rest of the docs).
The last thing that you can see in the demo is YCM's diagnostic display
features (the little red X that shows up in the left gutter; inspired by
Syntastic [20]) if you are editing a C-family file. As Clang compiles your file
and detects warnings or errors, they will be presented in various ways. You
don't need to save your file or press any keyboard shortcut to trigger this, it
"just happens" in the background.
In essence, YCM obsoletes the following Vim plugins because it has all of their
features plus extra:
- clang_complete
- AutoComplPop
- Supertab
- neocomplcache
**And that's not all...**
YCM also provides semantic IDE-like features in a number of languages,
including:
- finding declarations, definitions, usages, etc. of identifiers,
- displaying type information for classes, variables, functions etc.,
- displaying documentation for methods, members, etc. in the preview window,
- fixing common coding errors, like missing semi-colons, typos, etc.,
- semantic renaming of variables across files (JavaScript only).
Features vary by file type, so make sure to check out the file type feature
summary and the full list of completer subcommands to find out what's available
for your favourite languages.
You'll also find that YCM has filepath completers (try typing './' in a file)
and a completer that integrates with UltiSnips [21].
===============================================================================
*youcompleteme-installation*
Installation ~
-------------------------------------------------------------------------------
*youcompleteme-mac-os-x*
Mac OS X ~
Please refer to the full Installation Guide below; the following commands are
provided on a best-effort basis and may not work for you.
Install the latest version of MacVim [22]. Yes, MacVim. And yes, the _latest_.
If you don't use the MacVim GUI, it is recommended to use the Vim binary that
is inside the MacVim.app package ('MacVim.app/Contents/MacOS/Vim'). To ensure
it works correctly copy the 'mvim' script from the MacVim [22] download to your
local binary folder (for example '/usr/local/bin/mvim') and then symlink it:
>
ln -s /usr/local/bin/mvim vim
<
Install YouCompleteMe with Vundle [23].
**Remember:** YCM is a plugin with a compiled component. If you **update** YCM
using Vundle and the ycm_core library APIs have changed (happens rarely), YCM
will notify you to recompile it. You should then rerun the install process.
**NOTE:** If you want C-family completion, you MUST have the latest Xcode
installed along with the latest Command Line Tools (they are installed
automatically when you run 'clang' for the first time, or manually by running
'xcode-select --install')
Install CMake. Preferably with Homebrew [24], but here's the stand-alone CMake
installer [25].
_If_ you have installed a Homebrew Python and/or Homebrew MacVim, see the _FAQ_
for details.
Compiling YCM **with** semantic support for C-family languages:
>
cd ~/.vim/bundle/YouCompleteMe
./install.py --clang-completer
<
Compiling YCM **without** semantic support for C-family languages:
>
cd ~/.vim/bundle/YouCompleteMe
./install.py
<
The following additional language support options are available:
- C# support: install Mono with Homebrew [24] or by downloading the Mono Mac
package [26] and add '--omnisharp-completer' when calling './install.py'.
- Go support: install Go [27] and add '--gocode-completer' when calling
'./install.py'.
- TypeScript support: install Node.js and npm [28] then install the
TypeScript SDK with 'npm install -g typescript'.
- JavaScript support: install Node.js and npm [28] and add '--tern-completer'
when calling './install.py'.
- Rust support: install Rust [29] and add '--racer-completer' when calling
'./install.py'.
To simply compile with everything enabled, there's a '--all' flag. So, to
install with all language features, ensure 'xbuild', 'go', 'tsserver', 'node',
'npm', 'rustc', and 'cargo' tools are installed and in your 'PATH', then simply
run:
>
cd ~/.vim/bundle/YouCompleteMe
./install.py --all
<
That's it. You're done. Refer to the _User Guide_ section on how to use YCM.
Don't forget that if you want the C-family semantic completion engine to work,
you will need to provide the compilation flags for your project to YCM. It's
all in the User Guide.
YCM comes with sane defaults for its options, but you still may want to take a
look at what's available for configuration. There are a few interesting options
that are conservatively turned off by default that you may want to turn on.
-------------------------------------------------------------------------------
*youcompleteme-ubuntu-linux-x64*
Ubuntu Linux x64 ~
Please refer to the full Installation Guide below; the following commands are
provided on a best-effort basis and may not work for you.
Make sure you have Vim 7.4.143 with Python 2 or Python 3 support. Ubuntu 14.10
and later have a Vim that's recent enough. You can see the version of Vim
installed by running 'vim --version'. If the version is too old, you may need
to compile Vim from source [30] (don't worry, it's easy).
Install YouCompleteMe with Vundle [23].
**Remember:** YCM is a plugin with a compiled component. If you **update** YCM
using Vundle and the ycm_core library APIs have changed (happens rarely), YCM
will notify you to recompile it. You should then rerun the install process.
Install development tools and CMake: 'sudo apt-get install build-essential
cmake'
Make sure you have Python headers installed: 'sudo apt-get install python-dev
python3-dev'.
Compiling YCM **with** semantic support for C-family languages:
>
cd ~/.vim/bundle/YouCompleteMe
./install.py --clang-completer
<
Compiling YCM **without** semantic support for C-family languages:
>
cd ~/.vim/bundle/YouCompleteMe
./install.py
<
The following additional language support options are available:
- C# support: install Mono [31] and add '--omnisharp-completer' when calling
'./install.py'.
- Go support: install Go [27] and add '--gocode-completer' when calling
'./install.py'.
- TypeScript support: install Node.js and npm [28] then install the
TypeScript SDK with 'npm install -g typescript'.
- JavaScript support: install Node.js and npm [28] and add '--tern-completer'
when calling './install.py'.
- Rust support: install Rust [29] and add '--racer-completer' when calling
'./install.py'.
To simply compile with everything enabled, there's a '--all' flag. So, to
install with all language features, ensure 'xbuild', 'go', 'tsserver', 'node',
'npm', 'rustc', and 'cargo' tools are installed and in your 'PATH', then simply
run:
>
cd ~/.vim/bundle/YouCompleteMe
./install.py --all
<
That's it. You're done. Refer to the _User Guide_ section on how to use YCM.
Don't forget that if you want the C-family semantic completion engine to work,
you will need to provide the compilation flags for your project to YCM. It's
all in the User Guide.
YCM comes with sane defaults for its options, but you still may want to take a
look at what's available for configuration. There are a few interesting options
that are conservatively turned off by default that you may want to turn on.
-------------------------------------------------------------------------------
*youcompleteme-fedora-linux-x64*
Fedora Linux x64 ~
Please refer to the full Installation Guide below; the following commands are
provided on a best-effort basis and may not work for you.
Make sure you have Vim 7.4.143 with Python 2 or Python 3 support. Fedora 21 and
later have a Vim that's recent enough. You can see the version of Vim installed
by running 'vim --version'. If the version is too old, you may need to compile
Vim from source [30] (don't worry, it's easy).
Install YouCompleteMe with Vundle [23].
**Remember:** YCM is a plugin with a compiled component. If you **update** YCM
using Vundle and the ycm_core library APIs have changed (happens rarely), YCM
will notify you to recompile it. You should then rerun the install process.
Install development tools and CMake: 'sudo dnf install automake gcc gcc-c++
kernel-devel cmake'
Make sure you have Python headers installed: 'sudo dnf install python-devel
python3-devel'.
Compiling YCM **with** semantic support for C-family languages:
>
cd ~/.vim/bundle/YouCompleteMe
./install.py --clang-completer
<
Compiling YCM **without** semantic support for C-family languages:
>
cd ~/.vim/bundle/YouCompleteMe
./install.py
<
The following additional language support options are available:
- C# support: install Mono [32] and add '--omnisharp-completer' when calling
'./install.py'.
- Go support: install Go [27] and add '--gocode-completer' when calling
'./install.py'.
- TypeScript support: install Node.js and npm [28] then install the
TypeScript SDK with 'npm install -g typescript'.
- JavaScript support: install Node.js and npm [28] and add '--tern-completer'
when calling './install.py'.
- Rust support: install Rust [29] and add '--racer-completer' when calling
'./install.py'.
To simply compile with everything enabled, there's a '--all' flag. So, to
install with all language features, ensure 'xbuild', 'go', 'tsserver', 'node',
'npm', 'rustc', and 'cargo' tools are installed and in your 'PATH', then simply
run:
>
cd ~/.vim/bundle/YouCompleteMe
./install.py --all
<
That's it. You're done. Refer to the _User Guide_ section on how to use YCM.
Don't forget that if you want the C-family semantic completion engine to work,
you will need to provide the compilation flags for your project to YCM. It's
all in the User Guide.
YCM comes with sane defaults for its options, but you still may want to take a
look at what's available for configuration. There are a few interesting options
that are conservatively turned off by default that you may want to turn on.
-------------------------------------------------------------------------------
*youcompleteme-windows*
Windows ~
Please refer to the full Installation Guide below; the following commands are
provided on a best-effort basis and may not work for you.
**Important:** we assume that you are using the 'cmd.exe' command prompt and
that you know how to add an executable to the PATH environment variable.
Make sure you have at least Vim 7.4.143 with Python 2 or Python 3 support. You
can check the version and which Python is supported by typing ':version' inside
Vim. Look at the features included: '+python/dyn' for Python 2 and
'+python3/dyn' for Python 3. Take note of the Vim architecture, i.e. 32 or
64-bit. It will be important when choosing the Python installer. We recommend
using a 64-bit client. Daily updated copies of 32-bit and 64-bit Vim with
Python 2 and Python 3 support [33] are available.
Install YouCompleteMe with Vundle [23].
**Remember:** YCM is a plugin with a compiled component. If you **update** YCM
using Vundle and the ycm_core library APIs have changed (happens rarely), YCM
will notify you to recompile it. You should then rerun the install process.
Download and install the following software:
- Python 2 or Python 3 [34]. Be sure to pick the version corresponding to
your Vim architecture. It is _Windows x86_ for a 32-bit Vim and _Windows
x86-64_ for a 64-bit Vim. We recommend installing Python 3.
- CMake [25]. Add CMake executable to the PATH environment variable.
- Visual Studio [35]. Download the community edition. During setup, choose
_Custom_ as the installation type and select the _Visual C++_ component.
- 7-zip [36]. Required to build YCM with semantic support for C-family
languages.
Compiling YCM **with** semantic support for C-family languages:
>
cd %USERPROFILE%/vimfiles/bundle/YouCompleteMe
install.py --clang-completer
<
Compiling YCM **without** semantic support for C-family languages:
>
cd %USERPROFILE%/vimfiles/bundle/YouCompleteMe
install.py
<
The following additional language support options are available:
- C# support: add '--omnisharp-completer' when calling |install.py|. Be sure
that the build utility 'msbuild' is in your PATH [37].
- Go support: install Go [27] and add '--gocode-completer' when calling
|install.py|.
- TypeScript support: install Node.js and npm [28] then install the
TypeScript SDK with 'npm install -g typescript'.
- JavaScript support: install Node.js and npm [28] and add '--tern-completer'
when calling |install.py|.
- Rust support: install Rust [29] and add '--racer-completer' when calling
|install.py|.
To simply compile with everything enabled, there's a '--all' flag. So, to
install with all language features, ensure 'msbuild', 'go', 'tsserver', 'node',
'npm', and 'cargo' tools are installed and in your 'PATH', then simply run:
>
cd %USERPROFILE%/vimfiles/bundle/YouCompleteMe
python install.py --all
<
You can specify the Microsoft Visual C++ (MSVC) version using the '--msvc'
option. YCM officially supports MSVC 11 (Visual Studio 2012), 12 (2013), and 14
(2015).
That's it. You're done. Refer to the _User Guide_ section on how to use YCM.
Don't forget that if you want the C-family semantic completion engine to work,
you will need to provide the compilation flags for your project to YCM. It's
all in the User Guide.
YCM comes with sane defaults for its options, but you still may want to take a
look at what's available for configuration. There are a few interesting options
that are conservatively turned off by default that you may want to turn on.
-------------------------------------------------------------------------------
*youcompleteme-freebsd-openbsd*
FreeBSD/OpenBSD ~
Please refer to the full Installation Guide below; the following commands are
provided on a best-effort basis and may not work for you. OpenBSD / FreeBSD are
not officially supported platforms by YCM.
Make sure you have Vim 7.4.143 with Python 2 or Python 3 support.
OpenBSD 5.5 and later have a Vim that's recent enough. You can see the version
of Vim installed by running 'vim --version'.
FreeBSD 10.x comes with clang compiler but not the libraries needed to install.
>
pkg install llvm38 boost-all boost-python-libs clang38
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/llvm38/lib/
<
Install YouCompleteMe with Vundle [23].
**Remember:** YCM is a plugin with a compiled component. If you **update** YCM
using Vundle and the ycm_core library APIs have changed (happens rarely), YCM
will notify you to recompile it. You should then rerun the install process.
Install dependencies and CMake: 'sudo pkg_add llvm boost cmake'
Compiling YCM **with** semantic support for C-family languages:
>
cd ~/.vim/bundle/YouCompleteMe
./install.py --clang-completer --system-libclang --system-boost
<
Compiling YCM **without** semantic support for C-family languages:
>
cd ~/.vim/bundle/YouCompleteMe
./install.py --system-boost
<
The following additional language support options are available:
- C# support: install Mono and add '--omnisharp-completer' when calling
'./install.py'.
- Go support: install Go [27] and add '--gocode-completer' when calling
'./install.py'.
- TypeScript support: install Node.js and npm [28] then install the
TypeScript SDK with 'npm install -g typescript'.
- JavaScript support: install Node.js and npm [28] and add '--tern-completer'
when calling './install.py'.
- Rust support: install Rust [29] and add '--racer-completer' when calling
'./install.py'.
To simply compile with everything enabled, there's a '--all' flag. So, to
install with all language features, ensure 'xbuild', 'go', 'tsserver', 'node',
'npm', and 'cargo' tools are installed and in your 'PATH', then simply run:
>
cd ~/.vim/bundle/YouCompleteMe
./install.py --all
<
That's it. You're done. Refer to the _User Guide_ section on how to use YCM.
Don't forget that if you want the C-family semantic completion engine to work,
you will need to provide the compilation flags for your project to YCM. It's
all in the User Guide.
YCM comes with sane defaults for its options, but you still may want to take a
look at what's available for configuration. There are a few interesting options
that are conservatively turned off by default that you may want to turn on.
-------------------------------------------------------------------------------
*youcompleteme-full-installation-guide*
Full Installation Guide ~
These are the steps necessary to get YCM working on a Unix OS and on Windows.
**Note to Windows users:** we assume that you are running the 'cmd.exe' command
prompt and that the needed executables are in the PATH environment variable. Do
not just copy the shell commands. Replace '~' by '%USERPROFILE%' in them and
use the right Vim home directory. It should be 'vimfiles' by default instead of
'.vim'.
See the _FAQ_ if you have any issues.
**Remember:** YCM is a plugin with a compiled component. If you **update** YCM
using Vundle and the ycm_core library APIs have changed (happens rarely), YCM
will notify you to recompile it. You should then rerun the install process.
**Please follow the instructions carefully. Read EVERY WORD.**
1. **Ensure that your version of Vim is _at least_ 7.4.143 _and_ that it has
support for Python 2 or Python 3 scripting**.
Inside Vim, type ':version'. Look at the first two to three lines of
output; it should say 'Vi IMproved X.Y', where X.Y is the major version
of vim. If your version is greater than 7.4, then you're all set. If your
version is 7.4 then look below that where it says, 'Included patches:
1-Z', where Z will be some number. That number needs to be 143 or higher.
If your version of Vim is not recent enough, you may need to compile Vim
from source [30] (don't worry, it's easy).
After you have made sure that you have Vim 7.4.143+, type the following
in Vim: ":echo has('python') || has('python3')". The output should be 1.
If it's 0, then get a version of Vim with Python support.
On Windows, check also if your Vim architecture is 32 or 64-bit. This is
critical because it must match the Python and the YCM libraries
architectures. We recommend using a 64-bit Vim.
2. **Install YCM** with Vundle [23] (or Pathogen [38], but Vundle is a
better idea). With Vundle, this would mean adding a "Plugin
'Valloric/YouCompleteMe'" line to your vimrc [39].
If you don't install YCM with Vundle, make sure you have run 'git
submodule update --init --recursive' after checking out the YCM
repository (Vundle will do this for you) to fetch YCM's dependencies.
3. [Complete this step ONLY if you care about semantic completion support
for C-family languages. Otherwise it's not necessary.]
**Download the latest version of 'libclang'**. Clang is an open-source
compiler that can compile C/C++/Objective-C/Objective-C++. The 'libclang'
library it provides is used to power the YCM semantic completion engine
for those languages. YCM is designed to work with libclang version 3.8 or
higher.
You can use the system libclang _only if you are sure it is version 3.8
or higher_, otherwise don't. Even if it is, we recommend using the
official binaries from llvm.org [40] if at all possible. Make sure you
download the correct archive file for your OS.
We **STRONGLY recommend AGAINST use** of the system libclang instead of
the upstream compiled binaries. Random things may break. Save yourself
the hassle and use the upstream pre-built libclang.
4. **Compile the 'ycm_core' library** that YCM needs. This library is the
C++ engine that YCM uses to get fast completions.
You will need to have 'cmake' installed in order to generate the required
makefiles. Linux users can install cmake with their package manager
('sudo apt-get install cmake' for Ubuntu) whereas other users can
download and install [25] cmake from its project site. Mac users can also
get it through Homebrew [24] with 'brew install cmake'.
On a Unix OS, you need to make sure you have Python headers installed. On
a Debian-like Linux distro, this would be 'sudo apt-get install python-
dev python3-dev'. On Mac they should already be present.
On Windows, you need to download and install Python 2 or Python 3 [34].
Pick the version corresponding to your Vim architecture. You will also
need Microsoft Visual C++ (MSVC) to build YCM. You can obtain it by
installing Visual Studio [35]. MSVC 11 (Visual Studio 2012), 12 (2013),
and 14 (2015) are officially supported.
Here we'll assume you installed YCM with Vundle. That means that the top-
level YCM directory is in '~/.vim/bundle/YouCompleteMe'.
We'll create a new folder where build files will be placed. Run the
following:
>
cd ~
mkdir ycm_build
cd ycm_build
<
Now we need to generate the makefiles. If you DON'T care about semantic
support for C-family languages, run the following command in the
'ycm_build' directory:
>
cmake -G "<generator>" . ~/.vim/bundle/YouCompleteMe/third_party/ycmd/cpp
<
where '<generator>' is 'Unix Makefiles' on Unix systems and one of the
following Visual Studio generators on Windows:
- 'Visual Studio 11 Win64'
- 'Visual Studio 12 Win64'
- 'Visual Studio 14 Win64'
Remove the 'Win64' part in these generators if your Vim architecture is
32-bit.
For those who want to use the system version of boost, you would pass
'-DUSE_SYSTEM_BOOST=ON' to cmake. This may be necessary on some systems
where the bundled version of boost doesn't compile out of the box.
NOTE: We **STRONGLY recommend AGAINST use** of the system boost instead
of the bundled version of boost. Random things may break. Save yourself
the hassle and use the bundled version of boost.
If you DO care about semantic support for C-family languages, then your
'cmake' call will be a bit more complicated. We'll assume you downloaded
a binary distribution of LLVM+Clang from llvm.org in step 3 and that you
extracted the archive file to folder '~/ycm_temp/llvm_root_dir' (with
'bin', 'lib', 'include' etc. folders right inside that folder). On
Windows, you can extract the files from the LLVM+Clang installer using
7-zip [36].
NOTE: This _only_ works with a _downloaded_ LLVM binary package, not a
custom-built LLVM! See docs below for 'EXTERNAL_LIBCLANG_PATH' when using
a custom LLVM build.
With that in mind, run the following command in the 'ycm_build'
directory:
>
cmake -G "<generator>" -DPATH_TO_LLVM_ROOT=~/ycm_temp/llvm_root_dir . ~/.vim/bundle/YouCompleteMe/third_party/ycmd/cpp
<
where '<generator>' is replaced like above.
Now that configuration files have been generated, compile the libraries
using this command:
>
cmake --build . --target ycm_core --config Release
<
The '--config Release' part is specific to Windows and will be ignored on
a Unix OS.
For those who want to use the system version of libclang, you would pass
'-DUSE_SYSTEM_LIBCLANG=ON' to cmake _instead of_ the
'-DPATH_TO_LLVM_ROOT=...' flag.
NOTE: We **STRONGLY recommend AGAINST use** of the system libclang
instead of the upstream compiled binaries. Random things may break. Save
yourself the hassle and use the upstream pre-built libclang.
You could also force the use of a custom libclang library with
'-DEXTERNAL_LIBCLANG_PATH=/path/to/libclang.so' flag (the library would
end with '.dylib' on a Mac). Again, this flag would be used _instead of_
the other flags. **If you compiled LLVM from source, this is the flag you
should be using.**
Running the 'cmake' command will also place the 'libclang.[so|dylib|dll]'
in the 'YouCompleteMe/third_party/ycmd' folder for you if you compiled
with clang support (it needs to be there for YCM to work).
5. Set up support for additional languages, as desired:
6. C# support: install Mono on non-Windows platforms [41]. Navigate to
'YouCompleteMe/third_party/ycmd/third_party/OmniSharpServer' and run
'msbuild /property:Configuration=Release' on Windows. Replace 'msbuild'
by 'xbuild' on other platforms. On Windows, be sure that the build
utility 'msbuild' is in your PATH [37].
7. Go support: install Go [27] and add it to your path. Navigate to
'YouCompleteMe/third_party/ycmd/third_party/gocode' and run 'go build'.
8. TypeScript support: as with the quick installation, simply 'npm install
-g typescript' after successfully installing Node.js and npm [28].
9. JavaScript support: install Node.js and npm [28]. Then navigate to
'YouCompleteMe/third_party/ycmd/third_party/tern_runtime' and run 'npm
install --production'
10. Rust support: install Rust [29]. Navigate to
'YouCompleteMe/third_party/ycmd/third_party/racerd' and run 'cargo
build --release'.
That's it. You're done. Refer to the _User Guide_ section on how to use YCM.
Don't forget that if you want the C-family semantic completion engine to work,
you will need to provide the compilation flags for your project to YCM. It's
all in the User Guide.
YCM comes with sane defaults for its options, but you still may want to take a
look at what's available for configuration. There are a few interesting options
that are conservatively turned off by default that you may want to turn on.
===============================================================================
*youcompleteme-quick-feature-summary*
Quick Feature Summary ~
-------------------------------------------------------------------------------
*youcompleteme-general*
General (all languages) ~
- Super-fast identifier completer including tags files and syntax elements
- Intelligent suggestion ranking and filtering
- File and path suggestions
- Suggestions from Vim's OmniFunc
- UltiSnips snippet suggestions
-------------------------------------------------------------------------------
*youcompleteme-c-family-languages*
C-family languages (C, C++, Objective C, Objective C++) ~
- Semantic auto-completion
- Real-time diagnostic display
- Go to include/declaration/definition (|GoTo|, etc.)
- Semantic type information for identifiers (|GetType|)
- Automatically fix certain errors (|FixIt|)
- View documentation comments for identifiers (|GetDoc|)
-------------------------------------------------------------------------------
*youcompleteme-c*
C♯ ~
- Semantic auto-completion
- Real-time diagnostic display
- Go to declaration/definition (|GoTo|, etc.)
- Semantic type information for identifiers (|GetType|)
- Automatically fix certain errors (|FixIt|)
- Management of OmniSharp server instance
- View documentation comments for identifiers (|GetDoc|)
-------------------------------------------------------------------------------
*youcompleteme-python*
Python ~
- Intelligent auto-completion
- Go to declaration/definition, find references (|GoTo|, |GoToReferences|)
- View documentation comments for identifiers (|GetDoc|)
- Restart JediHTTP [11] server using a different Python interpreter
-------------------------------------------------------------------------------
*youcompleteme-go*
Go ~
- Semantic auto-completion
- Go to definition (|GoTo|)
- Management of 'gocode' server instance
-------------------------------------------------------------------------------
*youcompleteme-typescript*
TypeScript ~
- Semantic auto-completion
- Renaming symbols ('RefactorRename <new name>')
- Go to definition, find references (|GoToDefinition|, |GoToReferences|)
- Semantic type information for identifiers (|GetType|)
- View documentation comments for identifiers (|GetDoc|)
-------------------------------------------------------------------------------
*youcompleteme-javascript*
JavaScript ~
- Intelligent auto-completion
- Renaming variables ('RefactorRename <new name>')
- Go to definition, find references (|GoToDefinition|, |GoToReferences|)
- Type information for identifiers (|GetType|)
- View documentation comments for identifiers (|GetDoc|)
- Management of 'Tern' server instance
-------------------------------------------------------------------------------
*youcompleteme-rust*
Rust ~
- Semantic auto-completion
- Go to definition (|GoTo|, |GoToDefinition|, and |GoToDeclaration| are
identical)
- Management of 'racer' server instance
- View documentation comments for identifiers (|GetDoc|)
===============================================================================
*youcompleteme-user-guide*
User Guide ~
-------------------------------------------------------------------------------
*youcompleteme-general-usage*
General Usage ~
- If the offered completions are too broad, keep typing characters; YCM will
continue refining the offered completions based on your input.
- Filtering is "smart-case" sensitive; if you are typing only lowercase
letters, then it's case-insensitive. If your input contains uppercase
letters, then the uppercase letters in your query must match uppercase
letters in the completion strings (the lowercase letters still match both).
So, "foo" matches "Foo" and "foo", "Foo" matches "Foo" and "FOO" but not
"foo".
- Use the TAB key to accept a completion and continue pressing TAB to cycle
through the completions. Use Shift-TAB to cycle backwards. Note that if
you're using console Vim (that is, not Gvim or MacVim) then it's likely
that the Shift-TAB binding will not work because the console will not pass
it to Vim. You can remap the keys; see the _Options [42]_ section below.
Knowing a little bit about how YCM works internally will prevent confusion. YCM
has several completion engines: an identifier-based completer that collects all
of the identifiers in the current file and other files you visit (and your tags
files) and searches them when you type (identifiers are put into per-filetype
groups).