274 lines
9.7 KiB
Markdown
274 lines
9.7 KiB
Markdown
# vim-go
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Go (golang) support for Vim, which comes with pre-defined sensible settings (like
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auto gofmt on save), with autocomplete, snippet support, improved syntax
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highlighting, go toolchain commands, and more. If needed vim-go installs all
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necessary binaries for providing seamless Vim integration with current
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commands. It's highly customizable and each individual feature can be
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disabled/enabled easily.
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## Features
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* Improved Syntax highlighting with items such as Functions, Operators, Methods.
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* Auto completion support via `gocode`
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* Better `gofmt` on save, which keeps cursor position and doesn't break your undo
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history
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* Go to symbol/declaration with `:GoDef`
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* Look up documentation with `:GoDoc` inside Vim or open it in browser
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* Automatically import packages via `:GoImport` or plug it into autosave
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* Compile your package with `:GoBuild`, install it with `:GoInstall` or test
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them with `:GoTest` (also supports running single tests via `:GoTestFunc`)
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* Quickly execute your current file/files with `:GoRun`
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* Automatic `GOPATH` detection based on the directory structure (i.e. `gb`
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projects, `godep` vendored projects)
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* Change or display `GOPATH` with `:GoPath`
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* Create a coverage profile and display annotated source code in browser to see
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which functions are covered with `:GoCoverage`
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* Call `gometalinter` with `:GoMetaLinter`, which invokes all possible linters
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(golint, vet, errcheck, deadcode, etc..) and shows the warnings/errors
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* Lint your code with `:GoLint`
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* Run your code through `:GoVet` to catch static errors
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* Advanced source analysis tools utilizing oracle, such as `:GoImplements`,
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`:GoCallees`, and `:GoReferrers`
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* Precise type-safe renaming of identifiers with `:GoRename`
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* List all source files and dependencies
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* Unchecked error checking with `:GoErrCheck`
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* Integrated and improved snippets, supporting `ultisnips` or `neosnippet`
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* Share your current code to [play.golang.org](http://play.golang.org) with `:GoPlay`
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* On-the-fly type information about the word under the cursor. Plug it into
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your custom vim function.
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* Go asm formatting on save
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* Tagbar support to show tags of the source code in a sidebar with `gotags`
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* Custom vim text objects such as `a function` or `inner function`
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list.
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* A async launcher for the go command is implemented for Neovim, fully async
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building and testing (beta).
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* Integrated with the Neovim terminal, launch `:GoRun` and other go commands
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in their own new terminal. (beta)
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* Alternate between implementation and test code with `:GoAlternate`
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## Install
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Vim-go follows the standard runtime path structure, so I highly recommend to
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use a common and well known plugin manager to install vim-go. Do not use vim-go
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with other Go oriented vim plugins. For Pathogen just clone the repo. For other
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plugin managers add the appropriate lines and execute the plugin's install
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command.
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* [Pathogen](https://github.com/tpope/vim-pathogen)
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* `git clone https://github.com/fatih/vim-go.git ~/.vim/bundle/vim-go`
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* [vim-plug](https://github.com/junegunn/vim-plug)
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* `Plug 'fatih/vim-go'`
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* [NeoBundle](https://github.com/Shougo/neobundle.vim)
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* `NeoBundle 'fatih/vim-go'`
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* [Vundle](https://github.com/gmarik/vundle)
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* `Plugin 'fatih/vim-go'`
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Please be sure all necessary binaries are installed (such as `gocode`, `godef`,
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`goimports`, etc.). You can easily install them with the included
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`:GoInstallBinaries` command. If invoked, all necessary binaries will be
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automatically downloaded and installed to your `$GOBIN` environment (if not set
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it will use `$GOPATH/bin`). Note that this command requires `git` for fetching
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the individual Go packages. Additionally, use `:GoUpdateBinaries` to update the
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installed binaries.
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### Optional
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* Autocompletion is enabled by default via `<C-x><C-o>`. To get real-time
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completion (completion by type) install:
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[neocomplete](https://github.com/Shougo/neocomplete.vim) for Vim or
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[deoplete](https://github.com/Shougo/deoplete.nvim) and
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[deoplete-go](https://github.com/zchee/deoplete-go) for NeoVim
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* To display source code tag information on a sidebar install
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[tagbar](https://github.com/majutsushi/tagbar).
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* For snippet features install:
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[neosnippet](https://github.com/Shougo/neosnippet.vim) or
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[ultisnips](https://github.com/SirVer/ultisnips).
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* Screenshot color scheme is a slightly modified molokai:
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[fatih/molokai](https://github.com/fatih/molokai).
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* For a better documentation viewer checkout:
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[go-explorer](https://github.com/garyburd/go-explorer).
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## Usage
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Many of the plugin's [features](#features) are enabled by default. There are no
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additional settings needed. All usages and commands are listed in
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`doc/vim-go.txt`. Note that help tags needs to be populated. Check your plugin
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manager settings to generate the documentation (some do it automatically).
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After that just open the help page to see all commands:
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:help vim-go
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## Mappings
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vim-go has several `<Plug>` mappings which can be used to create custom
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mappings. Below are some examples you might find useful:
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Run commands such as `go run` for the current file with `<leader>r` or `go
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build` and `go test` for the current package with `<leader>b` and `<leader>t`
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respectively. Display beautifully annotated source code to see which functions
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are covered with `<leader>c`.
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```vim
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au FileType go nmap <leader>r <Plug>(go-run)
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au FileType go nmap <leader>b <Plug>(go-build)
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au FileType go nmap <leader>t <Plug>(go-test)
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au FileType go nmap <leader>c <Plug>(go-coverage)
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```
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By default the mapping `gd` is enabled, which opens the target identifier in
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current buffer. You can also open the definition/declaration, in a new vertical,
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horizontal, or tab, for the word under your cursor:
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```vim
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au FileType go nmap <Leader>ds <Plug>(go-def-split)
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au FileType go nmap <Leader>dv <Plug>(go-def-vertical)
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au FileType go nmap <Leader>dt <Plug>(go-def-tab)
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```
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Open the relevant Godoc for the word under the cursor with `<leader>gd` or open
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it vertically with `<leader>gv`
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```vim
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au FileType go nmap <Leader>gd <Plug>(go-doc)
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au FileType go nmap <Leader>gv <Plug>(go-doc-vertical)
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```
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Or open the Godoc in browser
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```vim
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au FileType go nmap <Leader>gb <Plug>(go-doc-browser)
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```
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Show a list of interfaces which is implemented by the type under your cursor
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with `<leader>s`
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```vim
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au FileType go nmap <Leader>s <Plug>(go-implements)
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```
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Show type info for the word under your cursor with `<leader>i` (useful if you
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have disabled auto showing type info via `g:go_auto_type_info`)
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```vim
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au FileType go nmap <Leader>i <Plug>(go-info)
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```
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Rename the identifier under the cursor to a new name
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```vim
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au FileType go nmap <Leader>e <Plug>(go-rename)
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```
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More `<Plug>` mappings can be seen with `:he go-mappings`. Also these are just
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recommendations, you are free to create more advanced mappings or functions
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based on `:he go-commands`.
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## Settings
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Below are some settings you might find useful. For the full list see `:he
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go-settings`.
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By default syntax-highlighting for Functions, Methods and Structs is disabled.
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To change it:
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```vim
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let g:go_highlight_functions = 1
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let g:go_highlight_methods = 1
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let g:go_highlight_structs = 1
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let g:go_highlight_interfaces = 1
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let g:go_highlight_operators = 1
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let g:go_highlight_build_constraints = 1
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```
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Enable goimports to automatically insert import paths instead of gofmt:
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```vim
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let g:go_fmt_command = "goimports"
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```
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By default vim-go shows errors for the fmt command, to disable it:
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```vim
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let g:go_fmt_fail_silently = 1
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```
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Disable auto fmt on save:
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```vim
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let g:go_fmt_autosave = 0
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```
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Disable opening browser after posting your snippet to `play.golang.org`:
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```vim
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let g:go_play_open_browser = 0
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```
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By default when `:GoInstallBinaries` is called, the binaries are installed to
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`$GOBIN` or `$GOPATH/bin`. To change it:
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```vim
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let g:go_bin_path = expand("~/.gotools")
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let g:go_bin_path = "/home/fatih/.mypath" "or give absolute path
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```
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### Using with Neovim (beta)
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Note: Neovim currently is not a first class citizen for vim-go. You are free
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to open bugs but I'm not going to look at them. Even though I'm using Neovim
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myself, Neovim itself is still alpha. So vim-go might not work well as good as
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in Vim. I'm happy to accept pull requests or very detailed bug reports.
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Run `:GoRun` in a new tab, horizontal split or vertical split terminal
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```vim
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au FileType go nmap <leader>rt <Plug>(go-run-tab)
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au FileType go nmap <Leader>rs <Plug>(go-run-split)
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au FileType go nmap <Leader>rv <Plug>(go-run-vertical)
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```
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By default new terminals are opened in a vertical split. To change it
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```vim
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let g:go_term_mode = "split"
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```
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By default the testing commands run asynchronously in the background and
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display results with `go#jobcontrol#Statusline()`. To make them run in a new
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terminal
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```vim
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let g:go_term_enabled = 1
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```
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### Using with Syntastic
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Sometimes when using both `vim-go` and `syntastic` Vim will start lagging while
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saving and opening files. The following fixes this:
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```vim
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let g:syntastic_go_checkers = ['golint', 'govet', 'errcheck']
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let g:syntastic_mode_map = { 'mode': 'active', 'passive_filetypes': ['go'] }
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```
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## More info
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Check out the [Wiki](https://github.com/fatih/vim-go/wiki) page for more
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information. It includes
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[Screencasts](https://github.com/fatih/vim-go/wiki/Screencasts), an [FAQ
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section](https://github.com/fatih/vim-go/wiki/FAQ-Troubleshooting), and many
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other [various pieces](https://github.com/fatih/vim-go/wiki) of information.
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## Credits
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* Go Authors for official vim plugins
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* Gocode, Godef, Golint, Oracle, Goimports, Gotags, Errcheck projects and
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authors of those projects.
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* Other vim-plugins, thanks for inspiration (vim-golang, go.vim, vim-gocode,
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vim-godef)
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* [Contributors](https://github.com/fatih/vim-go/graphs/contributors) of vim-go
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## License
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The BSD 3-Clause License - see `LICENSE` for more details
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