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2017-03-07 18:04:28 +01:00

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vim-go

Vim-go logo

Go (golang) support for Vim, which comes with pre-defined sensible settings (like auto gofmt on save), with autocomplete, snippet support, improved syntax highlighting, go toolchain commands, and more. If needed vim-go installs all necessary binaries for providing seamless Vim integration with current commands. It's highly customizable and each individual feature can be disabled/enabled easily.

Features

Improved Syntax highlighting with items such as Functions, Operators, Methods.
Auto completion support via gocode
Better gofmt on save, which keeps cursor position and doesn't break your undo history
Go to symbol/declaration with :GoDef
Look up documentation with :GoDoc inside Vim or open it in browser
Automatically import packages via :GoImport or plug it into autosave
Compile your package with :GoBuild, install it with :GoInstall or test them with :GoTest (also supports running single tests via :GoTestFunc)
Quickly execute your current file/files with :GoRun
Automatic GOPATH detection based on the directory structure (i.e. gb projects, godep vendored projects)
Change or display GOPATH with :GoPath
Create a coverage profile and display annotated source code to see which functions are covered with :GoCoverage
Call gometalinter with :GoMetaLinter, which invokes all possible linters (golint, vet, errcheck, deadcode, etc..) and shows the warnings/errors
Lint your code with :GoLint
Run your code through :GoVet to catch static errors
Advanced source analysis tools utilizing guru, such as :GoImplements, :GoCallees, and :GoReferrers
Precise type-safe renaming of identifiers with :GoRename
List all source files and dependencies
Unchecked error checking with :GoErrCheck
Integrated and improved snippets, supporting ultisnips or neosnippet
Share your current code to play.golang.org with :GoPlay
On-the-fly type information about the word under the cursor. Plug it into your custom vim function.
Go asm formatting on save
Tagbar support to show tags of the source code in a sidebar with gotags
Custom vim text objects such as a function or inner function list.
Jump to function or type declarations with :GoDecls or :GoDeclsDir
Vim 8.0 support. Async execution for most commands, various underlying improvements.
NeoVim support (beta). Async execution for some commands.
Alternate between implementation and test code with :GoAlternate

Checkout the official tutorial that goes literally over all features and shows many tips and tricks. It shows how to install vim-go and explains many unknown use cases. Recommended for beginners as well as advanced users: https://github.com/fatih/vim-go-tutorial

Install

Master branch is supposed to be a development branch. So stuff here can break and change. Please try use always the latest release

Vim-go follows the standard runtime path structure, so I highly recommend to use a common and well known plugin manager to install vim-go. Do not use vim-go with other Go oriented vim plugins. For Pathogen just clone the repo. For other plugin managers add the appropriate lines and execute the plugin's install command.

Pathogen
git clone https://github.com/fatih/vim-go.git ~/.vim/bundle/vim-go
vim-plug
Plug 'fatih/vim-go'
NeoBundle
NeoBundle 'fatih/vim-go'
Vundle
Plugin 'fatih/vim-go'
Vim packages (since Vim 7.4.1528)
git clone https://github.com/fatih/vim-go.git ~/.vim/pack/plugins/start/vim-go

Please be sure all necessary binaries are installed (such as gocode, godef, goimports, etc.). You can easily install them with the included :GoInstallBinaries command. If invoked, all necessary binaries will be automatically downloaded and installed to your $GOBIN environment (if not set it will use $GOPATH/bin). Note that this command requires git for fetching the individual Go packages. Additionally, use :GoUpdateBinaries to update the installed binaries.

Optional

Autocompletion is enabled by default via <C-x><C-o>. To get real-time completion (completion by type) install: neocomplete for Vim or deoplete and deoplete-go for NeoVim or SimpleAutoCmplPop
To display source code tag information on a sidebar install tagbar.
For snippet features install: neosnippet or ultisnips.
Screenshot color scheme is a slightly modified molokai: fatih/molokai.
For a better documentation viewer checkout: go-explorer.

Usage

Many of the plugin's features are enabled by default. There are no additional settings needed. All usages and commands are listed in doc/vim-go.txt. Note that help tags needs to be populated. Check your plugin manager settings to generate the documentation (some do it automatically). After that just open the help page to see all commands:

:help vim-go

Example Mappings

vim-go has several <Plug> mappings which can be used to create custom mappings. Unless otherwise specified, none of these mappings are enabled by default. Here some examples you might find useful:

Run commands such as go run for the current file with <leader>r or go build and go test for the current package with <leader>b and <leader>t respectively. Display beautifully annotated source code to see which functions are covered with <leader>c.

au FileType go nmap <leader>r <Plug>(go-run)
au FileType go nmap <leader>b <Plug>(go-build)
au FileType go nmap <leader>t <Plug>(go-test)
au FileType go nmap <leader>c <Plug>(go-coverage)

By default the mapping gd is enabled, which opens the target identifier in current buffer. You can also open the definition/declaration, in a new vertical, horizontal, or tab, for the word under your cursor:

au FileType go nmap <leader>ds <Plug>(go-def-split)
au FileType go nmap <leader>dv <Plug>(go-def-vertical)
au FileType go nmap <leader>dt <Plug>(go-def-tab)

Open the relevant Godoc for the word under the cursor with <leader>gd or open it vertically with <leader>gv

au FileType go nmap <leader>gd <Plug>(go-doc)
au FileType go nmap <leader>gv <Plug>(go-doc-vertical)

Or open the Godoc in browser

au FileType go nmap <leader>gb <Plug>(go-doc-browser)

Show a list of interfaces which is implemented by the type under your cursor with <leader>s

au FileType go nmap <leader>s <Plug>(go-implements)

Show type info for the word under your cursor with <leader>i (useful if you have disabled auto showing type info via g:go_auto_type_info)

au FileType go nmap <leader>i <Plug>(go-info)

Rename the identifier under the cursor to a new name

au FileType go nmap <leader>e <Plug>(go-rename)

More <Plug> mappings can be seen with :he go-mappings. Also these are just recommendations, you are free to create more advanced mappings or functions based on :he go-commands.

Settings

Below are some settings you might find useful. For the full list see :he go-settings.

By default syntax-highlighting for Functions, Methods and Structs is disabled. To change it:

let g:go_highlight_functions = 1
let g:go_highlight_methods = 1
let g:go_highlight_fields = 1
let g:go_highlight_types = 1
let g:go_highlight_operators = 1
let g:go_highlight_build_constraints = 1

Enable goimports to automatically insert import paths instead of gofmt:

let g:go_fmt_command = "goimports"

By default vim-go shows errors for the fmt command, to disable it:

let g:go_fmt_fail_silently = 1

Disable auto fmt on save:

let g:go_fmt_autosave = 0

Disable opening browser after posting your snippet to play.golang.org:

let g:go_play_open_browser = 0

By default when :GoInstallBinaries is called, the binaries are installed to $GOBIN or $GOPATH/bin. To change it:

let g:go_bin_path = expand("~/.gotools")
let g:go_bin_path = "/home/fatih/.mypath"      "or give absolute path

Disable updating dependencies when installing/updating binaries:

let g:go_get_update = 0

Using with Neovim (beta)

Note: Neovim currently is not a first class citizen for vim-go. You are free to open bug, however I'm not using Neovim so it's hard for me to test it. vim-go might not work well as good as in Vim. I'm happy to accept pull requests or very detailed bug reports. If you're interested to improve the state of Neovim in vim-go you're always welcome!

Run :GoRun in a new tab, horizontal split or vertical split terminal

au FileType go nmap <leader>rt <Plug>(go-run-tab)
au FileType go nmap <leader>rs <Plug>(go-run-split)
au FileType go nmap <leader>rv <Plug>(go-run-vertical)

By default new terminals are opened in a vertical split. To change it

let g:go_term_mode = "split"

By default the testing commands run asynchronously in the background and display results with go#jobcontrol#Statusline(). To make them run in a new terminal

let g:go_term_enabled = 1

Using with Syntastic

Sometimes when using both vim-go and syntastic Vim will start lagging while saving and opening files. The following fixes this:

let g:syntastic_go_checkers = ['golint', 'govet', 'errcheck']
let g:syntastic_mode_map = { 'mode': 'active', 'passive_filetypes': ['go'] }

Another issue with vim-go and syntastic is that the location list window that contains the output of commands such as :GoBuild and :GoTest might not appear. To resolve this:

let g:go_list_type = "quickfix"

More info

Check out the Wiki page for more information. It includes Screencasts, an FAQ section, and many other various pieces of information.

Development & Testing

vim-go supports now test files. Please check autoload folder for examples. If you add a new feature be sure you also include the _test.vim file next to the script. Test functions should be starting with Test_, example:

function Test_run_fmt()
  call assert_equal(expected, actual)
  ...
endfunction

You can locally test it by running:

make

This will run all tests and print either PASS or FAIL to indicate the final status of all tests.

Additionally, each new pull request will trigger a new Travis-ci job.

Donation

People have asked for this for a long time, now you can be a fully supporter by being a patron!

By being a patron, you are enabling vim-go to grow and mature, helping me to invest in bug fixes, new documentation, and improving both current and future features. It's completely optional and is just a direct way to support Vim-go's ongoing development. Thanks!

https://www.patreon.com/fatih

Credits

Go Authors for official vim plugins
Gocode, Godef, Golint, Guru, Goimports, Gotags, Errcheck projects and authors of those projects.
Other vim-plugins, thanks for inspiration (vim-golang, go.vim, vim-gocode, vim-godef)
Contributors of vim-go

License

The BSD 3-Clause License - see LICENSE for more details

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