*vim-go.txt* Go development plugin
*vim-go*

===============================================================================
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===============================================================================
CONTENTS                                                          *go-contents*

	1. Intro........................................|go-intro|
	2. Install......................................|go-install|
	3. Commands.....................................|go-commands|
	4. Mappings.....................................|go-mappings|
	5. Text Objects.................................|go-text-objects|
	6. Settings.....................................|go-settings|
	7. Troubleshooting..............................|go-troubleshooting|
	8. Credits......................................|go-credits|

===============================================================================
INTRO                                                                *go-intro*

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

  * Improved Syntax highlighting, such as Functions, Operators, Methods..
  * Auto completion support via `gocode`
  * Better `gofmt` on save, keeps cursor position and doesn't break your undo
    history
  * Go to symbol/declaration with `godef`
  * Automatically import packages via `goimports`
  * Compile and `go build` your package, install it with `go install`
  * `go run` quickly your current file/files
  * Run `go test` and see any errors in quickfix window
  * Lint your code with `golint`
  * Run your code trough `go vet` to catch static errors.
  * Advanced source analysis tool with `oracle`
  * Precise type-safe renaming of identifiers with `gorename`
  * List all source files and dependencies
  * Checking with `errcheck` for unchecked errors.
  * Integrated and improved snippets. Supports `ultisnips` or `neosnippet`
  * Share your current code to play.golang.org
  * Type information about the underlying identifier
  * Tagbar support to show tags of the source code in a sidebar with `gotags`

===============================================================================
INSTALL                                                           *go-install*

If you use pathogen, just clone it into your bundle directory: >

	$ cd ~/.vim/bundle
	$ git clone https://github.com/fatih/vim-go.git
<

For Vundle add this line to your vimrc:
>
  Plugin 'fatih/vim-go'
<
and execute `:PluginInstall` (or `:BundleInstall` for older versions of Vundle)


Please be sure all necessary binares are installed (such as `gocode`, `godef`,
`goimports`, etc..). You can easily install them with the included
|GoInstallBinaries|. Those binaries will be automatically downloaded and
installed to your `$GOBIN` environment (if not set it will use `$GOPATH/bin`).
It requires `git` and `hg` for fetching the individual Go packages.

* Autocompletion is enabled by default via `<C-x><C-o>`, to get real-time
completion (completion by type) install:
https://github.com/Valloric/YouCompleteMe or
https://github.com/Shougo/neocomplete.vim
* To get displayed source code tag informations on a sidebar install
https://github.com/majutsushi/tagbar.
* For snippet feature install:
https://github.com/SirVer/ultisnips or
https://github.com/Shougo/neosnippet.vim.

===============================================================================
COMMANDS                                                          *go-commands*

                                                                  *:GoImport*
:GoImport [path]

    Import ensures that the provided package {path} is imported in the current
    Go buffer, using proper style and ordering.  If {path} is already being
    imported, an error will be displayed and the buffer will be untouched.

                                                                *:GoImportAs*
:GoImportAs [localname] [path]

    Same as Import, but uses a custom local name for the package.

                                                                    *:GoDrop*
:GoDrop [path]

    Remove the import line for the provided package {path}, if present in the
    current Go buffer.  If {path} is not being imported, an error will be
    displayed and the buffer will be untouched.

                                                                    *:GoLint*
:GoLint

    Run golint for the current Go file.

                                                                     *:GoDoc*
:GoDoc [word]

    Open the relevant GoDoc in split window for either the word[s] passed to
    the command or by default, the word under the cursor.

                                                              *:GoDocBrowser*
:GoDocBrowser [word]

    Open the relevant GoDoc in browser for either the word[s] passed to the
    command or by default, the word under the cursor.

                                                                     *:GoFmt*
:GoFmt

    Filter the current Go buffer through gofmt.  It tries to preserve cursor
    position and avoids replacing the buffer with stderr output.

                                                                  *:GoImports*
:GoImports

    Filter the current Go buffer through goimports (needs to be installed).
    `goimports` automatically discards/add import path based on the code. Like
    |GoFmt|, It tries to preserve cursor position and avoids replacing the
    buffer with stderr output.

                                                                     *:GoPlay*
:[range]GoPlay

    Share snippet to play.golang.org. If no [range] is given it shares
    the whole file, otherwise the selected lines are shared. Snippet URL
    is copied to system clipboard if Vim is compiled with 'clipboard' or
     'xterm-clipboard' otherwise it's get yanked into the `""` register.

                                                                     *:GoVet*
:GoVet

    Run `go vet` for the directory under your current file. Vet examines Go
    source code and reports suspicious constructs, such as Printf calls whose
    arguments do not align with the format string. Vet uses heuristics that do not
    guarantee all reports are genuine problems, but it can find errors not caught
    by the compilers.

                                                                     *:GoDef*
:GoDef [identifier]

    Goto declaration/definition for the given [identifier]. If no argument is
    given, it will jump to the declaration under the cursor. By default the
    mapping `gd` is enabled to invoke GoDef for the identifier under the cursor.
    See |g:go_def_mapping_enabled| to disable it.

                                                                     *:GoRun*
:GoRun[!] [expand]

    Build and run your current main package. By default all main files for the
    current file is used. If an argument is passed, 'expand' is used as file
    selector. For example use `:GoRun %` to select the current file only.

    If [!] is not given the first error is jumped to.

                                                                   *:GoBuild*
:GoBuild[!] [options]

    Build your package with `go build`. It automatically builds only the files
    that depends on the current file. GoBuild doesn't produce a result file.
    Use 'make' to create a result file.

    You may optionally pass any valid go build flags/options. For a full list
    please see `go help build`.

    If [!] is not given the first error is jumped to.

                                                                    *:GoInfo*
:GoInfo
    Show type information about the identifer under the cursor. For example
    putting it above a function call is going to show the full function
    signature. It uses gocode to get the type informations.


                                                                 *:GoInstall*
:GoInstall

  Install your package with `go install`.

                                                                    *:GoTest*
:GoTest [expand]

    Test your _test.go files via in your current directory. Errors are
    populated in quickfix window.  If an argument is passed, 'expand' is used
    as file selector (useful for cases like `:GoTest ./...`).

                                                                *:GoCoverage*
:GoCoverage

    Create a coverage profile and open a browser to display the annotated
    source code of the current package.

                                                                *:GoErrCheck*
:GoErrCheck

    Check for unchecked errors in you current package. Errors are populated in
    quickfix window.

                                                                   *:GoFiles*
:GoFiles

    Show source files that depends for the current package

                                                                    *:GoDeps*
:GoDeps

    Show dependencies for the current package

                                                          *:GoInstallBinaries*
:GoInstallBinaries

    Download and Install all necessary Go tool binaries such as `godef`,
    `goimports`, `gocode`, etc.. under `g:go_bin_path`

                                                          *:GoUpdateBinaries*
:GoUpdateBinaries

    Download and Update previously installed Go tool binaries such as `godef`,
    `goimports`, `gocode`, etc.. under `g:go_bin_path`. This can be used to
    update the necessary Go binaries.

                                                              *:GoImplements*
:GoImplements

    Show 'implements' relation for a selected package. A list of interfaces
    for the type that implements an interface under the cursor (or selected
    package) is shown in a custom window. Hit `<enter>` to jump in a new tab
    or close it via `<c-c>`.

                                                                *:GoRename*
:GoRename [to]

    Rename the identifier under the cursor to the desired new name. If no
    argument is given a prompt will ask for the desired identifier.

                                                              *:GoCallees*
:GoCallees

    Show 'callees' relation for a selected package. A list of call targets
    for the type under the cursor (or selected package) is shown in a custom
    window. Hit `<enter>` to jump in a new tab or close it via `<c-c>`. For
    example if called for a interface method call, it will show all call targets
    that has implemented the method.


===============================================================================
MAPPINGS                                                        *go-mappings*

vim-go has several <Plug> keys which can be used to create custom mappings
For example, to create a mapping that `go run` the current file create a
mapping for the `(go-run)`: >

  au FileType go nmap <leader>r <Plug>(go-run)

As always one is free to create more advanced mappings or functions based
with |go-commands|. Available <Plug> keys are:

                                                                  *(go-run)*

Calls `go run` for the current file


                                                                *(go-build)*

Calls `go build` for the current package


                                                                 *(go-info)*

Shows type information for the word under the cursor


                                                              *(go-install)*

Calls `go install` for the current package


                                                                 *(go-test)*

Calls `go test` for the current package

                                                             *(go-coverage)*

Calls `go test -coverprofile-temp.out` for the current package

                                                                  *(go-vet)*

Calls `go vet` for the current package


                                                                *(go-files)*

Show source files that depends for the current package


                                                                 *(go-deps)*

Show dependencies for the current package

                                                                  *(go-doc)*

Show the relevant GoDoc for the word under the cursor in a split window
leftabove (default mode).

                                                            *(go-doc-split)*

Show the relevant GoDoc for the word under the cursor in a split window.


                                                         *(go-doc-vertical)*

Show the relevant GoDoc for the word under the cursor in a vertical split
window.


                                                              *(go-doc-tab)*

Show the relevant GoDoc for the word under the cursor in a tab window.


                                                          *(go-doc-browser)*

Show the relevant GoDoc for the word under in browser

                                                                  *(go-def)*

Goto declaration/definition. Results are shown in the current buffer.


                                                            *(go-def-split)*

Goto declaration/definition. Results are shown in a split window.


                                                         *(go-def-vertical)*

Goto declaration/definition. Results are shown in a vertical split window.


                                                              *(go-def-tab)*

Goto declaration/definition. Results are shown in a tab window.

                                                          *(go-implements)*

Show the interfaces that the type under the cursor implements.

                                                              *(go-rename)*

Rename the identifier under the cursor to the desired new name

                                                              *(go-callees)*

Show the call targets for the type under the cursor

===============================================================================
TEXT OBJECTS                                                 *go-text-objects*

vim-go comes with several custom |text-objects| that can be used to operate
upon regions of text. vim-go currently defines the following text objects:

                                               *go-v_af* *go-af*
af			      "a function", select contents from a function definition to the
               closing bracket.

                                               *go-v_if* *go-if*
if			      "inside a function", select contents of a function,
			        excluding the function definition and the closing bracket.


===============================================================================
SETTINGS                                                        *go-settings*

                                                *'g:go_play_browser_command'*

Use this option to change the browser that is used to open the snippet url
posted to play.golang.org with |:GoPlay| or for the relevant documentation
used with |:GoDocBrowser|. By default it tries to find it automatically for
the current OS. >

  let g:play_browser_command = ''
<
                                                   *'g:go_play_open_browser'*

Use this option to open browser after posting the snippet to play.golang.org
with |:GoPlay|. By default it's enabled. >

  let g:go_play_open_browser = 1
<
                                                      *'g:go_auto_type_info'*

Use this option to show the type info (|:GoInfo|) for the word under the cursor
automatically. Whenever the cursor changes the type info will be updated.
By default it's disabled >

  let g:go_auto_type_info = 0
<
                                                        *'g:go_fmt_autosave'*

Use this option to auto |:GoFmt| on save. By default it's enabled >

  let g:go_fmt_autosave = 1
<
                                                         *'g:go_fmt_command'*

Use this option to define which tool is used to gofmt. By default `gofmt` is
used >

  let g:go_fmt_command = "gofmt"
<
                                                         *'g:go_fmt_options'*

Use this option to add additional options to the |g:go_fmt_command|. Default
is empty. >

  let g:go_fmt_options = ''
<

                                                   *'g:go_fmt_fail_silently'*

Use this option to disable showing a quickfix window when |g:go_fmt_command|
fails. By default it's disabled. >

  let g:go_fmt_fail_silently = 0
<

                                                   *'g:go_fmt_experimental'*

Use this option to enable fmt's experimental mode. This experimental mode is
superior to the current mode as it fully saves the undo history, so undo/redo
doesn't break. However it's causing problems on some Vim versions. By default
it's disabled. >

  let g:go_fmt_experimental = 1
<
                                              *'g:go_doc_keywordprg_enabled'*

Use this option to change the enable GoDoc to run on words under the cursor
with the default K , keywordprg shortcut. This shortcut is by default set to
use the program man. However in go using godoc is more idiomatic. Default is
enabled. >

  let g:go_doc_keywordprg_enabled = 1
<
                                                 *'g:go_def_mapping_enabled'*

Use this option to enabled/ disable the default mapping (`gd`) for GoDef
enabled. Disabling it allows you to map something else to the mapping `gd`.
Default is enabled. >

  let g:go_def_mapping_enabled = 1
<
                                                         *'g:go_doc_command'*

Use this option to define which tool is used to godoc. By default `godoc` is
used >

  let g:go_doc_command = "godoc"
<
                                                         *'g:go_doc_options'*

Use this option to add additional options to the |g:go_doc_command|. Default
is empty. >

  let g:go_doc_options = ''

<                                                            *'g:go_bin_path'*

Use this option to change default path for vim-go tools when using
|GoInstallBinaries| and |GoUpdateBinaries|. If not set `$GOBIN` or
`$GOPATH/bin` is used. >

  let g:go_bin_path = ""
<
                                                      *'g:go_snippet_engine'*

Use this option to define the default snippet engine.  By default "ultisnips"
is used. Use "neosnippet" for neosnippet.vim: >

  let g:go_snippet_engine = "ultisnips"
<

                                      *'g:go_highlight_array_whitespace_error'*

Highlights white space after "[]". >

  let g:go_highlight_array_whitespace_error = 1
<

                                      *'g:go_highlight_chan_whitespace_error'*

Highlights white space around the communications operator that don't follow
the standard style. >

  let g:go_highlight_chan_whitespace_error = 1
<

                                                *'g:go_highlight_extra_types'*

Highlights commonly used library types (io.Reader, etc.). >

  let g:go_highlight_extra_types = 1
<

                                            *'g:go_highlight_space_tab_error'*

Highlights instances of tabs following spaces. >

  let g:go_highlight_space_tab_error = 1
<
                                  *'g:go_highlight_trailing_whitespace_error'*

Highlights trailing white space. >

  let g:go_highlight_trailing_whitespace_error = 1

<
                                                  *'g:go_highlight_operators'*

Highlights operators such as `:=` , `==`, `-=`, etc ...By default it's
disabled. >

	let g:go_highlight_operators = 0
<
                                                *'g:go_highlight_functions'*

Highlights function names. By default it's disabled. >

	let g:go_highlight_functions = 0
<
                                                  *'g:go_highlight_methods'*

Highlights method names. By default it's disabled. >

	let g:go_highlight_methods = 0
<
                                                  *'g:go_highlight_structs'*

Highlights struct names. By default it's disabled. >

	let g:go_highlight_structs = 0
<
                                        *'g:go_highlight_build_constraints'*

Highlights build constraints. By default it's disabled. >

	let g:go_highlight_build_constraints = 0
<
                                                  *'g:go_textobj_enabled'*

Adds custom text objects. By default it's enabled. >

	let g:go_textobj_enabled = 1

===============================================================================
TROUBLESHOOTING                                         *go-troubleshooting*

I'm using Fish shell but have some problems using Vim-go~

First environment variables in Fish are applied differently, it should be like:
>
	set -x GOPATH /your/own/gopath
<
Second, Vim needs a POSIX compatible shell (more info here:
https://github.com/dag/vim-fish#teach-a-vim-to-fish). If you use Fish to open
vim, it will make certainx shell based commands fail (means vim-go will fail
too). To overcome this problem change the default shell by adding the
following into your .vimrc (on the top of the file):
>
	if $SHELL =~ 'fish'
	  set shell='/bin/sh'
	endif
<
or
>
	set shell='/bin/sh'
>

I'm seeing weirds errors during the startup~

If you see errors like this:
>
  Error installing code.google.com/p/go.tools/cmd/goimports:
	Error installing code.google.com/p/rog-go/exp/cmd/godef:
<
that means your local Go setup is broken or the remote website is down.  For
example sometimes code.google.com times out. To test, just execute a simple go
get:

>
	go get code.google.com/p/go.tools/cmd/goimports
<
You'll see a more detailed error. If this works, vim-go will work too.

===============================================================================
CREDITS                                                         *go-credits*

* Go Authors for offical vim plugins
* Gocode, Godef, Golint, Oracle, Goimports, Errcheck projects and authors of
  those projects.
* Other vim-plugins, thanks for inspiration (vim-golang, go.vim, vim-gocode,
  vim-godef)
* vim-go contributors: https://github.com/fatih/vim-go/graphs/contributors


vim:ft=help:et:ts=2:sw=2:sts=2:norl