, / \,,_ .'| ,{{| /}}}}/_.' _____________________________________________ }}}}` '{{' '. / \ {{{{{ _ ;, \ / Ladies and Gentlemen, \ ,}}}}}} /o`\ ` ;) | | {{{{{{ / ( | this is ... | }}}}}} | \ | | {{{{{{{{ \ \ | | }}}}}}}}} '.__ _ | | _____ __ __ _ | {{{{{{{{ /`._ (_\ / | / ___/__ ______ / /_____ ______/ /_(_)____ | }}}}}}' | //___/ --=: \__ \/ / / / __ \/ __/ __ `/ ___/ __/ / ___/ | jgs `{{{{` | '--' | ___/ / /_/ / / / / /_/ /_/ (__ ) /_/ / /__ | }}}` | /____/\__, /_/ /_/\__/\__,_/____/\__/_/\___/ | | /____/ | | / \_____________________________________________/ - - - 1. [Introduction](#introduction) 2. [Installation](#installation) 2.1. [Requirements](#requirements) 2.2. [Installing syntastic with Pathogen](#installpathogen) 3. [Recommended settings](#settings) 4. [FAQ](#faq) 4.1. [I installed syntastic but it isn't reporting any errors...](#faqinfo) 4.2. [How can I check scripts written for different versions of Python?](#faqpython) 4.3. [How can I check scripts written for different versions of Ruby?](#faqruby) 4.4. [Are there any local checkers for HTML5 that I can use with syntastic?](#faqhtml5) 4.5. [The `perl` checker has stopped working...](#faqperl) 4.6. [What happened to the `rustc` checker?](#faqrust) 4.7. [What happened to the `tsc` checker?](#faqtsc) 4.8. [What happened to the `xcrun` checker?](#faqxcrun) 4.9. [I run a checker and the location list is not updated...](#faqloclist) 4.9. [I run`:lopen` or `:lwindow` and the error window is empty...](#faqloclist) 4.10. [How can I pass additional arguments to a checker?](#faqargs) 4.11. [Syntastic supports several checkers for my filetype - how do I tell which one(s) to use?](#faqcheckers) 4.12. [What is the difference between syntax checkers and style checkers?](#faqstyle) 4.13. [I have enabled multiple checkers for the current filetype. How can I display all errors from all checkers together?](#faqaggregate) 4.14. [How can I jump between the different errors without using the location list at the bottom of the window?](#faqlnext) 4.15. [My favourite checker needs to load a configuration file from the project's root rather than the current directory...](#faqconfig) 4.16. [The error window is closed automatically when I :quit the current buffer but not when I :bdelete it?](#faqbdelete) 5. [Resources](#otherresources) - - - ## 1\. Introduction Syntastic is a syntax checking plugin for [Vim][vim] that runs files through external syntax checkers and displays any resulting errors to the user. This can be done on demand, or automatically as files are saved. If syntax errors are detected, the user is notified and is happy because they didn't have to compile their code or execute their script to find them. At the time of this writing, syntastic has checking plugins for ACPI Source Language, ActionScript, Ada, Ansible configurations, API Blueprint, AppleScript, AsciiDoc, Assembly languages, BEMHTML, Bro, Bourne shell, C, C++, C#, Cabal, Chef, CoffeeScript, Coco, Coq, CSS, Cucumber, CUDA, D, Dart, DocBook, Dockerfile, Dust, Elixir, Erlang, eRuby, Fortran, Gentoo metadata, GLSL, Go, Haml, Haskell, Haxe, Handlebars, HSS, HTML, Java, JavaScript, JSON, JSX, LESS, Lex, Limbo, LISP, LLVM intermediate language, Lua, Markdown, MATLAB, Mercury, NASM, Nix, Objective-C, Objective-C++, OCaml, Perl, Perl POD, PHP, gettext Portable Object, OS X and iOS property lists, Pug (formerly Jade), Puppet, Python, QML, R, Racket, RDF TriG, RDF Turtle, Relax NG, reStructuredText, RPM spec, Ruby, SASS/SCSS, Scala, Slim, SML, Sphinx, SQL, Stylus, Tcl, TeX, Texinfo, Twig, TypeScript, Vala, Verilog, VHDL, VimL, xHtml, XML, XSLT, XQuery, YACC, YAML, YANG data models, z80, Zope page templates, and Zsh. See the [manual][checkers] for details about the corresponding supported checkers (`:help syntastic-checkers` in Vim). A number of third-party Vim plugins also provide checkers for syntastic, for example: [merlin][merlin], [omnisharp-vim][omnisharp], [rust.vim][rust], [syntastic-extras][myint], [syntastic-more][roktas], [tsuquyomi][tsuquyomi], [vim-crystal][crystal], [vim-eastwood][eastwood], and [vim-swift][swift]. Below is a screenshot showing the methods that Syntastic uses to display syntax errors. Note that, in practise, you will only have a subset of these methods enabled. ![Screenshot 1][screenshot] 1. Errors are loaded into the location list for the corresponding window. 2. When the cursor is on a line containing an error, the error message is echoed in the command window. 3. Signs are placed beside lines with errors - note that warnings are displayed in a different color. 4. There is a configurable statusline flag you can include in your statusline config. 5. Hover the mouse over a line containing an error and the error message is displayed as a balloon. 6. (not shown) Highlighting errors with syntax highlighting. Erroneous parts of lines can be highlighted. ## 2\. Installation ### 2.1\. Requirements Syntastic itself has rather relaxed requirements: it doesn't have any external dependencies, and it needs a version of [Vim][vim] compiled with a few common features: `autocmd`, `eval`, `file_in_path`, `modify_fname`, `quickfix`, `reltime`, and `user_commands`. Not all possible combinations of features that include the ones above make equal sense on all operating systems, but Vim version 7 or later with the "normal", "big", or "huge" feature sets should be fine. Syntastic should work with any modern plugin managers for Vim, such as [NeoBundle][neobundle], [Pathogen][pathogen], [Vim-Addon-Manager][vam], [Vim-Plug][plug], or [Vundle][vundle]. Instructions for installing syntastic with [Pathogen][pathogen] are included below for completeness. Starting with Vim version 7.4.1486 you can also load syntastic using the standard mechanism of packages, without the help of third-party plugin managers (see `:help packages` in Vim for details). Beware however that, while support for packages has been added in Vim 7.4.1384, the functionality needed by syntastic is present only in versions 7.4.1486 and later. Last but not least: syntastic doesn't know how to do any syntax checks by itself. In order to get meaningful results you need to install external checkers corresponding to the types of files you use. Please consult the [manual][checkers] (`:help syntastic-checkers` in Vim) for a list of supported checkers. ### 2.2\. Installing syntastic with Pathogen If you already have [Pathogen][pathogen] working then skip [Step 1](#step1) and go to [Step 2](#step2). #### 2.2.1\. Step 1: Install pathogen.vim First I'll show you how to install Tim Pope's [Pathogen][pathogen] so that it's easy to install syntastic. Do this in your terminal so that you get the `pathogen.vim` file and the directories it needs: ```sh mkdir -p ~/.vim/autoload ~/.vim/bundle && \ curl -LSso ~/.vim/autoload/pathogen.vim https://tpo.pe/pathogen.vim ``` Next you *need* to add this to your `~/.vimrc`: ```vim execute pathogen#infect() ``` #### 2.2.2\. Step 2: Install syntastic as a Pathogen bundle You now have pathogen installed and can put syntastic into `~/.vim/bundle` like this: ```sh cd ~/.vim/bundle && \ git clone --depth=1 https://github.com/scrooloose/syntastic.git ``` Quit vim and start it back up to reload it, then type: ```vim :Helptags ``` If you get an error when you do this, then you probably didn't install [Pathogen][pathogen] right. Go back to [Step 1](#step1) and make sure you did the following: 1. Created both the `~/.vim/autoload` and `~/.vim/bundle` directories. 2. Added the `execute pathogen#infect()` line to your `~/.vimrc` file 3. Did the `git clone` of syntastic inside `~/.vim/bundle` 4. Have permissions to access all of these directories. ## 3\. Recommended settings Syntastic has numerous options that can be configured, and the defaults are not particularly well suitable for new users. It is recommended that you start by adding the following lines to your `vimrc` file, and return to them after reading the manual (see `:help syntastic` in Vim): ```vim set statusline+=%#warningmsg# set statusline+=%{SyntasticStatuslineFlag()} set statusline+=%* let g:syntastic_always_populate_loc_list = 1 let g:syntastic_auto_loc_list = 1 let g:syntastic_check_on_open = 1 let g:syntastic_check_on_wq = 0 ``` ## 4\. FAQ __4.1. Q. I installed syntastic but it isn't reporting any errors...__ A. The most likely reason is that none of the syntax checkers that it requires are installed. For example: by default, python requires either `flake8` or `pylint` to be installed and in your `$PATH`. Read the [manual][checkers] (`:help syntastic-checkers` in Vim) to find out what executables are supported. Note that aliases do not work; the actual executables must be available in your `$PATH`. Symbolic links are okay though. You can see syntastic's idea of available checkers by running `:SyntasticInfo`. A second probable reason is that none of the available checkers are enabled. Syntastic comes preconfigured with a default list of enabled checkers per filetype, but this list is kept short in order to prevent slowing down Vim or trying to run conflicting checks. The command `:SyntasticInfo` will show you which checkers are enabled. You can tell syntastic which checkers (among the available ones) you want to run by setting `g:syntastic__checkers` in your `vimrc` (see [below](#faqcheckers)). A third possible reason is that the `$PATH` seen by syntastic might not be same as the `$PATH` in your login shell. Syntastic runs checkers using the shell pointed to by Vim's `shell` (or by `g:syntastic_shell`, if set), and that's the shell you need to configure to set the proper `$PATH` and environment variables for your checkers. You can see syntastic's idea of `$PATH` by running ```vim :echo syntastic#util#system('echo "$PATH"') ``` on UNIX and Mac OS-X systems, or ```vim :echo syntastic#util#system('echo %PATH%') ``` on Windows. Finally, another reason it could fail is that either the command line options or the error output for a syntax checker may have changed. In this case, make sure you have the latest version of the syntax checker installed. If it still fails then post an [issue][bug_tracker] - or better yet, create a pull request. __4.2. Q. How can I check scripts written for different versions of Python?__ A. Install a Python version manager such as [virtualenv][virtualenv] or [pyenv][pyenv], activate the environment for the relevant version of Python, and install in it the checkers you want to use. Set `g:syntastic_python_checkers` accordingly in your `vimrc`, and run [Vim][vim] from the virtual environment. If you're starting Vim from a desktop manager rather than from a terminal you might need to write wrapper scripts around your checkers, to activate the virtual environment before running the actual checks. Then you'll need to point the relevant `g:syntastic_python__exec` variables to the wrapper scripts. __4.3. Q. How can I check scripts written for different versions of Ruby?__ A. Install a Ruby version manager such as [rvm][rvm] or [rbenv][rbenv], activate the environment for the relevant version of Ruby, and install in it the checkers you want to use. Set `g:syntastic_ruby_checkers` accordingly in your `vimrc`, and run [Vim][vim] from the virtual environment. If you're starting Vim from a desktop manager rather than from a terminal you might need to write wrapper scripts around your checkers, to activate the virtual environment before running the actual checks. Then you'll need to point the relevant `g:syntastic_ruby__exec` variables to the wrapper scripts. __4.4. Q. Are there any local checkers for HTML5 that I can use with syntastic?__ [HTML Tidy][tidy_old] has a fork named [HTML Tidy for HTML5][tidy]. It's a drop in replacement, and syntastic can use it without changes. Just install it somewhere and point `g:syntastic_html_tidy_exec` to its executable: ```vim let g:syntastic_html_tidy_exec = 'tidy5' ``` Alternatively, you can install [vnu.jar][vnu_jar] from the [validator.nu][vnu] project and run it as a [HTTP server][vnu_server]: ```sh $ java -Xss512k -cp /path/to/vnu.jar nu.validator.servlet.Main 8888 ``` Then you can configure syntastic to use it: ```vim let g:syntastic_html_validator_api = 'http://localhost:8888/' ``` __4.5. Q. The `perl` checker has stopped working...__ A. The `perl` checker runs `perl -c` against your file, which in turn __executes__ any `BEGIN`, `UNITCHECK`, and `CHECK` blocks, and any `use` statements in your file (cf. [perlrun][perlrun]). This is probably fine if you wrote the file yourself, but it's a security problem if you're checking third-party files. Since there is currently no way to disable this behaviour while still producing useful results, the checker is now disabled by default. To (re-)enable it, make sure the `g:syntastic_perl_checkers` list includes `perl`, and set `g:syntastic_enable_perl_checker` to 1 in your `vimrc`: ```vim let g:syntastic_enable_perl_checker = 1 ``` __4.6. Q. What happened to the `rustc` checker?__ A. It is now part of the [rust.vim][rust] plugin. If you install this plugin the checker should be picked up automatically by syntastic. __4.7. Q. What happened to the `tsc` checker?__ A. It didn't meet people's expectations and it has been removed. Please consider using the external checker [tsuquyomi][tsuquyomi] instead. If you install this plugin the checker should be picked up automatically by syntastic. __4.8. Q. What happened to the `xcrun` checker?__ A. The `xcrun` checker used to have a security problem and it has been removed. A better checker for __Swift__ is part of the [vim-swift][swift] plugin. If you install this plugin the checker should be picked up automatically by syntastic. __4.9. Q. I run a checker and the location list is not updated...__ __4.9. Q. I run`:lopen` or `:lwindow` and the error window is empty...__ A. By default the location list is changed only when you run the `:Errors` command, in order to minimise conflicts with other plugins. If you want the location list to always be updated when you run the checkers, add this line to your `vimrc`: ```vim let g:syntastic_always_populate_loc_list = 1 ``` __4.10. Q. How can I pass additional arguments to a checker?__ A. Almost all syntax checkers use the `makeprgBuild()` function. Those checkers that do can be configured using global variables. The general form of the global `args` variables is `syntastic___args`. So, If you wanted to pass `--my --args --here` to the ruby mri checker you would add this line to your `vimrc`: ```vim let g:syntastic_ruby_mri_args = "--my --args --here" ``` See `:help syntastic-checker-options` for more information. __4.11. Q. Syntastic supports several checkers for my filetype - how do I tell it which one(s) to use?__ A. Stick a line like this in your `vimrc`: ```vim let g:syntastic__checkers = [''] ``` To see the list of supported checkers for your filetype read the [manual][checkers] (`:help syntastic-checkers` in Vim). e.g. Python has the following checkers, among others: `flake8`, `pyflakes`, `pylint` and a native `python` checker. To tell syntastic to use `pylint`, you would use this setting: ```vim let g:syntastic_python_checkers = ['pylint'] ``` Checkers can be chained together like this: ```vim let g:syntastic_php_checkers = ['php', 'phpcs', 'phpmd'] ``` This is telling syntastic to run the `php` checker first, and if no errors are found, run `phpcs`, and then `phpmd`. You can also run checkers explicitly by calling `:SyntasticCheck `. e.g. to run `phpcs` and `phpmd`: ```vim :SyntasticCheck phpcs phpmd ``` This works for any checkers available for the current filetype, even if they aren't listed in `g:syntastic__checkers`. You can't run checkers for "foreign" filetypes though (e.g. you can't run, say, a Python checker if the filetype of the current file is `php`). __4.12. Q. What is the difference between syntax checkers and style checkers?__ A. The errors and warnings they produce are highlighted differently and can be filtered by different rules, but otherwise the distinction is pretty much arbitrary. There is an ongoing effort to keep things consistent, so you can _generally_ expect messages produced by syntax checkers to be _mostly_ related to syntax, and messages produced by style checkers to be _mostly_ about style. But there can be no formal guarantee that, say, a style checker that runs into a syntax error wouldn't die with a fatal message, nor that a syntax checker wouldn't give you warnings against using some constructs as being bad practice. There is also no guarantee that messages marked as "style" are less severe than the ones marked as "syntax" (whatever that might mean). And there are even a few Frankenstein checkers (for example `flake8` and `pylama`) that, by their nature, produce both kinds of messages. Syntastic is not smart enough to be able to sort out these things by itself. In fact it's more useful to look at this from the perspective of filtering unwanted messages, rather than as an indicator of severity levels. The distinction between syntax and style is orthogonal to the distinction between errors and warnings, and thus you can turn off messages based on level, on type, or both. e.g. To disable all style messages: ```vim let g:syntastic_quiet_messages = { "type": "style" } ``` See `:help syntastic_quiet_messages` for details. __4.13. Q. I have enabled multiple checkers for the current filetype. How can I display all errors from all checkers together?__ A. Set `g:syntastic_aggregate_errors` to 1 in your `vimrc`: ```vim let g:syntastic_aggregate_errors = 1 ``` See `:help syntastic-aggregating-errors` for more details. __4.14. Q. How can I jump between the different errors without using the location list at the bottom of the window?__ A. Vim provides several built-in commands for this. See `:help :lnext` and `:help :lprevious`. If you use these commands a lot then you may want to add shortcut mappings to your `vimrc`, or install something like [unimpaired][unimpaired], which provides such mappings (among other things). __4.15. My favourite checker needs to load a configuration file from the project's root rather than the current directory...__ A. You can set up an `autocmd` to search for the configuration file in the current directory and upwards, and add it to the checker's options when found. For example for `jscs`: ```vim function! FindConfig(prefix, what, where) let cfg = findfile(a:what, escape(a:where, ' ') . ';') return cfg !=# '' ? ' ' . a:prefix . ' ' . cfg : '' endfunction autocmd FileType javascript let b:syntastic_javascript_jscs_args = \ get(g:, 'syntastic_javascript_jscs_args', '') . \ FindConfig('-c', '.jscsrc', expand(':p:h', 1)) ``` __4.16. Q. The error window is closed automatically when I :quit the current buffer but not when I :bdelete it?__ A. There is no safe way to handle that situation automatically, but you can work around it: ```vim nnoremap :lclose:bdelete cabbrev bd =(getcmdtype()==#':' && getcmdpos()==1 ? 'lclose\|bdelete' : 'bd') ``` ## 5\. Resources The preferred place for posting suggestions, reporting bugs, and general discussions related to syntastic is the [issue tracker at GitHub][bug_tracker]. A guide for writing syntax checkers can be found in the [wiki][guide]. There are also a dedicated [google group][google_group], and a [syntastic tag at StackOverflow][stack_overflow]. Syntastic aims to provide a common interface to syntax checkers for as many languages as possible. For particular languages, there are, of course, other plugins that provide more functionality than syntastic. You might want to take a look at [ghcmod-vim][ghcmod], [jedi-vim][jedi], [python-mode][python_mode], [vim-go][vimgo], or [YouCompleteMe][ycm]. [screenshot]: https://github.com/scrooloose/syntastic/raw/master/_assets/screenshot_1.png [bug_tracker]: https://github.com/scrooloose/syntastic/issues [checkers]: https://github.com/scrooloose/syntastic/blob/master/doc/syntastic-checkers.txt [crystal]: https://github.com/rhysd/vim-crystal [eastwood]: https://github.com/venantius/vim-eastwood [ghcmod]: https://github.com/eagletmt/ghcmod-vim [google_group]: https://groups.google.com/group/vim-syntastic [guide]: https://github.com/scrooloose/syntastic/wiki/Syntax-Checker-Guide [jedi]: https://github.com/davidhalter/jedi-vim [merlin]: https://github.com/the-lambda-church/merlin [myint]: https://github.com/myint/syntastic-extras [neobundle]: https://github.com/Shougo/neobundle.vim [omnisharp]: https://github.com/OmniSharp/omnisharp-vim [pathogen]: https://github.com/tpope/vim-pathogen [perlrun]: http://perldoc.perl.org/perlrun.html#*-c* [plug]: https://github.com/junegunn/vim-plug/ [pyenv]: https://github.com/yyuu/pyenv [python_mode]: https://github.com/klen/python-mode [rbenv]: https://github.com/rbenv/rbenv [roktas]: https://github.com/roktas/syntastic-more [rust]: https://github.com/rust-lang/rust.vim [rvm]: https://rvm.io/ [stack_overflow]: http://stackoverflow.com/questions/tagged/syntastic [swift]: https://github.com/kballard/vim-swift [tidy]: http://www.htacg.org/tidy-html5/ [tidy_old]: http://tidy.sourceforge.net/ [tsuquyomi]: https://github.com/Quramy/tsuquyomi/ [unimpaired]: https://github.com/tpope/vim-unimpaired [vam]: https://github.com/MarcWeber/vim-addon-manager [vim]: http://www.vim.org/ [vimgo]: https://github.com/fatih/vim-go [virtualenv]: https://virtualenv.pypa.io/en/stable/ [vnu]: http://about.validator.nu/ [vnu_jar]: https://github.com/validator/validator/releases/latest [vnu_server]: http://validator.github.io/validator/#standalone [vundle]: https://github.com/gmarik/Vundle.vim [ycm]: http://valloric.github.io/YouCompleteMe/