ultimate-vim/sources_non_forked/vim-go/doc/vim-go.txt

*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. Functions....................................|go-functions|
  7. Settings.....................................|go-settings|
  8. Syntax highlighting..........................|go-syntax|
  9. Debugger.....................................|go-debug|
 10. FAQ/Troubleshooting..........................|go-troubleshooting|
 11. Development..................................|go-development|
 12. Donation.....................................|go-donation|
 13. Credits......................................|go-credits|

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

Go (golang) support for Vim. vim-go comes with sensible predefined settings
(e.g. automatic `gofmt` on save), has autocomplete, snippet support, improved
syntax highlighting, go toolchain commands, etc. It is highly customizable,
and individual features can be toggled easily. vim-go leverages a number of
tools developed by the Go community to provide a seamless Vim experience.

  * Compile your package with |:GoBuild|, install it with |:GoInstall| or
    test it with |:GoTest|. Run a single test with |:GoTestFunc|).
  * Quickly execute your current file(s) with |:GoRun|.
  * Improved syntax highlighting and folding.
  * Debug programs with integrated `delve` support with |:GoDebugStart|.
  * Completion support via `gocode`.
  * `gofmt` or `goimports` on save keeps the cursor position and undo history.
  * Go to symbol/declaration with |:GoDef|.
  * Look up documentation with |:GoDoc| or |:GoDocBrowser|.
  * Easily import packages via |:GoImport|, remove them via |:GoDrop|.
  * Precise type-safe renaming of identifiers with |:GoRename|.
  * See which code is covered by tests with |:GoCoverage|.
  * Add or remove tags on struct fields with |:GoAddTags| and |:GoRemoveTags|.
  * Call `gometalinter` with |:GoMetaLinter| to invoke all possible linters
    (`golint`, `vet`, `errcheck`, `deadcode`, etc.) and put the result in the
    quickfix or location list.
  * Lint your code with |:GoLint|, run your code through |:GoVet| to catch
    static errors, or make sure errors are checked with |:GoErrCheck|.
  * Advanced source analysis tools utilizing `guru`, such as |:GoImplements|,
    |:GoCallees|, and |:GoReferrers|.
  * Automatic `GOPATH` detection which works with `gb` and `godep`. Change or
    display `GOPATH` with |:GoPath|.
  * Integrated and improved snippets, supporting `ultisnips`, `neosnippet`,
    and `vim-minisnip`.
  * Share your current code to play.golang.org with |:GoPlay|.
  * On-the-fly information about the word under the cursor. Plug it into your
    custom Vim function.
  * Text objects such as "a function" (|go-af|) or "inner function" (|go-if|).
  * Most commands are run asynchronous in Neovim and Vim 8. Fully async
    building and testing.
  * Integrated with the Neovim terminal, launch |:GoRun| and other Go commands
    in a terminal buffer.
  * Switch between `file.go` and `file_test.go` code with |:GoAlternate|.
  * Supports integration with the Tagbar and ctrlp.vim plugins.
  * ...and more...

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

The latest stable release, https://github.com/fatih/vim-go/releases/latest, is
the recommended version to use. If you choose to use the master branch
instead, please do so with caution; it is a _development_ branch.

vim-go follows the standard runtime path structure and should work with any of
the major plugin managers.

For Pathogen or Vim |packages|, just clone the repo. For other plugin managers
you may also need to add the lines to your vimrc to execute the plugin
manager's install command.

*  Vim 8 |packages|
>
    git clone https://github.com/fatih/vim-go.git \
      ~/.vim/pack/plugins/start/vim-go

*  https://github.com/tpope/vim-pathogen >

    git clone https://github.com/fatih/vim-go.git ~/.vim/bundle/vim-go
<
*  https://github.com/junegunn/vim-plug >

    Plug 'fatih/vim-go'

*  https://github.com/Shougo/neobundle.vim >

    NeoBundle 'fatih/vim-go'
<
*  https://github.com/gmarik/vundle >

    Plugin 'fatih/vim-go'
<
*  Manual (not recommended) >

    Copy all of the files into your `~/.vim` directory
<
You will also need to install all the necessary binaries. vim-go makes it easy
to install all of them by providing a command, |:GoInstallBinaries|, to
`go get` all the required binaries. The binaries will be installed to $GOBIN
or $GOPATH/bin (default: $HOME/go/bin). It requires `git`.

Depending on your installation method, you may have to generate the plugin's
|:helptags| manually (e.g. `:helptags ALL`).

Autocompletion is enabled by default via 'omnifunc', which you can trigger
with |i_CTRL-X_CTRL-O| (`<C-x><C-o>`).

Supported Go plugins~                                         *vim-go-plugins*

The following plugins are supported for use with vim-go:

* Real-time completion (Vim):
  https://github.com/Shougo/neocomplete.vim

* Real-time completion (Neovim and Vim 8):
  https://github.com/Shougo/deoplete.nvim and
  https://github.com/zchee/deoplete-go

* Display source code navigation in a sidebar:
  https://github.com/majutsushi/tagbar

* Snippets:
  https://github.com/Shougo/neosnippet.vim or
  https://github.com/SirVer/ultisnips or
  https://github.com/joereynolds/vim-minisnip

* For a better documentation viewer check out:
  https://github.com/garyburd/go-explorer

* Integration with `delve` (Neovim only):
  https://github.com/jodosha/vim-godebug

* Interactive |:GoDecls| and |:GoDeclsDir|:
  https://github.com/ctrlpvim/ctrlp.vim or
  https://github.com/junegunn/fzf.vim or
  https://github.com/Shougo/unite.vim or
  https://github.com/Shougo/denite.nvim

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

                                                                     *:GoPath*
:GoPath [path]

    GoPath sets and overrides GOPATH with the given {path}. If no {path} is
    given it shows the current GOPATH. If `""` is given as path, it clears
    current `GOPATH` which was set with |:GoPath| and restores `GOPATH` back
    to the initial value which was sourced when Vim was started.

                                                                   *: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.

    If [!] is given it will download the package with `go get`

                                                                 *: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 [packages]

    Run golint for the directory under your current file, or for the given
    packages.

                                                                      *: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. By default it opens the
    documentation in 'https://godoc.org'. To change it see |'g:go_doc_url'|.

                                                                      *: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[!] [options]

    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.

    You may optionally pass any valid go tool vet flags/options. In this case,
    `go tool vet` is run in place of `go vet`. For a full list please see
    `go tool vet -h`.

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

                                                                      *:GoDef*
:GoDef
gd
CTRL-]
g<C-LeftMouse>
<C-LeftMouse>

    Goto declaration/definition for the declaration under the cursor. By
    default the CTRL-] shortcut, the mapping `gd` and <C-LeftMouse>,
    g<LeftMouse> are enabled to invoke :GoDef for the identifier under the
    cursor. See |'g:go_def_mapping_enabled'| to disable them. No explicit
    arguments are supported.

    vim-go also keeps a per-window location stack, roughly analogous to how
    Vim's internal |tags| functionality works. This is pushed to every time a
    jump is made using the GoDef functionality. In essence, this is a LIFO
    list of file locations you have visited with :GoDef that is retained to
    help you navigate software.

                                                                 *:GoDefStack*
:GoDefStack [number]

    This command Jumps to a given location in the jumpstack, retaining all
    other entries. Jumps to non-existent entries will print an informative
    message, but are otherwise a noop.

    If no argument is given, it will print out an interactive list of all
    items in the stack. Its output looks like this:

      1 /path/first/file.go|1187 col 16|AddThing func(t *Thing)
    > 2 /path/thing/thing.go|624 col 19|String() string
      3 /path/thing/thing.go|744 col 6|func Sprintln(a ...interface{}) string

    This list shows the identifiers that you jumped to and the file and cursor
    position before that jump.  The older jumps are at the top, the newer at
    the bottom.

    The '>' points to the active entry.  This entry and any newer entries
    below it will be replaced if |:GoDef| is done from this location. The
    CTRL-t and |:GoDefPop| command will jump to the position above the active
    entry.

    Jumps to non-existent entries will print an informative message, but are
    otherwise a noop.

                                                            *:GoDefStackClear*
:GoDefStackClear

    Clears the current stack list and resets it.

                                                                   *:GoDefPop*
:GoDefPop [count]
CTRL-t

    Navigate to the [count] earlier entry in the jump stack, retaining the
    newer entries. If no argument is given, it will jump to the next most
    recent entry (`:GoDefPop 1`).  If [count] is greater than the number of
    prior entries, an error will be printed and no jump will be performed.

    If you have used :GoDefPop to jump to an earlier location, and you issue
    another :GoDef command, the current entry will be replaced, and all newer
    entries will be removed, effectively resuming the stack at that location.

    By default [count]CTRL-t is enabled to invoke :GoDefPop.  Similarly,
    hitting CTRL-t without a prior count is equivalent to `:GoDefPop 1`.  See
    |'g:go_def_mapping_enabled'| to disable this.

                                                                      *: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.

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

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

    If using neovim then `:GoRun` will run in a new terminal according to
    |'g:go_term_mode'|.

                                                                    *:GoBuild*
:GoBuild[!] [expand]

    Build your package with `go build`. Errors are populated in the quickfix
    window. 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`. Options are expanded with [expand].

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

    If using neovim then this command is fully async, it does not block the
    UI.

                                                                 *:GoGenerate*
:GoGenerate[!] [expand]

    Creates or updates your auto-generated source files by running `go
    generate`.

    You may optionally pass any valid go generate flags/options. For a full
    list please see `go help generate`. Options are expanded with [expand].

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

                                                                     *:GoInfo*
:GoInfo
    Show type information about the identifier under the cursor. For example
    putting it above a function call is going to show the full function
    signature. By default it uses `gocode` to get the type informations. To
    change the underlying tool from `gocode` to another tool, see
    |'g:go_info_mode'|.


                                                                  *:GoInstall*
:GoInstall[!] [options]

    Install your package with `go install`.

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

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

                                                                     *:GoTest*
:GoTest[!] [expand]

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

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

    GoTest timesout automatically after 10 seconds. To customize the timeout
    use |'g:go_test_timeout'|. This feature is disabled if any arguments are
    passed to the `:GoTest` command.

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

    If using neovim `:GoTest` will run in a new terminal or run asynchronously
    in the background according to |'g:go_term_enabled'|. You can set the mode
    of the new terminal with |'g:go_term_mode'|.

                                                                 *:GoTestFunc*
:GoTestFunc[!] [expand]

    Runs :GoTest, but only on the single test function immediate to your
    cursor using 'go test's '-run' flag.

    Lookup is done starting at the cursor (including that line) moving up till
    a matching `func Test` pattern is found or top of file is reached. Search
    will not wrap around when at the top of the file.

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

    If using neovim `:GoTestFunc` will run in a new terminal or run
    asynchronously in the background according to |'g:go_term_enabled'|. You
    can set the mode of the new terminal with |'g:go_term_mode'|.

                                                              *:GoTestCompile*
:GoTestCompile[!] [expand]

    Compile your _test.go files via in your current directory. Errors are
    populated in the quickfix window.  If an argument is passed, [expand] is
    used as file selector (useful for cases like `:GoTest ./...`). Useful to
    not run the tests and capture/fix errors before running the tests or to
    create test binary.

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

    If using neovim `:GoTestCompile` will run in a new terminal or run
    asynchronously in the background according to |'g:go_term_enabled'|. You
    can set the mode of the new terminal with |'g:go_term_mode'|.

                                                                 *:GoCoverage*
:GoCoverage[!] [options]

    Create a coverage profile and annotates the current file's source code. If
    called again it rerurns the tests.

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

                                                           *:GoCoverageToggle*
:GoCoverageToggle[!] [options]

    Create a coverage profile and annotates the current file's source code. If
    called again clears the annotation (works as a toggle).

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

                                                            *:GoCoverageClear*
:GoCoverageClear [options]

   Clears the coverage annotation.


                                                          *:GoCoverageBrowser*
:GoCoverageBrowser[!] [options]

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

    You may optionally pass any valid go test flags/options, such as
    `-covermode set,count,atomic`. For a full list please see `go help test`.

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

                                                                 *:GoErrCheck*
:GoErrCheck [options]

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

    You may optionally pass any valid errcheck flags/options. See
    `errcheck -h` for a full list.

                                                                    *:GoFiles*
:GoFiles [source_files]

    Show source files for the current package. The [source_files] specifies
    which file types to list. See the "// Source files" section of
    `go list -h` for possible values; multiple values are accepted.
    Command-line completion also works for this command.
    The default is to use `GoFiles` if no arguments are given.

                                                                     *:GoDeps*
:GoDeps

    Show dependencies for the current package.

                                                          *:GoInstallBinaries*
:GoInstallBinaries [binaries]

    Download and install all necessary Go tool binaries such as `godef`,
    `goimports`, `gocode`, etc. under |'g:go_bin_path'|. If [binaries] is
    supplied, then only the specified binaries will be installed. The default
    is to install everything.

    Set |'g:go_get_update'| to disable updating dependencies.

                                                           *:GoUpdateBinaries*
:GoUpdateBinaries [binaries]

    Download and update previously installed Go tool binaries such as `godef`,
    `goimports`, `gocode`, etc. under |'g:go_bin_path'|. If [binaries] is
    supplied, then only the specified binaries will be updated. The default is
    to update everything.

    Set |'g:go_get_update'| to disable updating dependencies.

                                                               *: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 location list.
                                                                   *: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.

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


                                                                *:GoGuruScope*
:GoGuruScope [pattern] [pattern2] ... [patternN]

    Changes the custom |'g:go_guru_scope'| setting and overrides it with the
    given package patterns. The custom scope is cleared (unset) if `""` is
    given as the only path. If no arguments is given it prints the current
    custom scope. Example patterns are:
>
      golang.org/x/tools/cmd/guru # a single package
      golang.org/x/tools/...      # all packages beneath dir
      ...                         # the entire workspace.
<
    Example usage, the following sets the scope to a `github.com/fatih/color`
    and to all packages under `golang.org/x/tools/`:
>
      :GoGuruScope github.com/fatih/color golang.org/x/tools/...
<
    The following sets it to the entire workspace:
>
      :GoGuruScope ...
<
    Under the hood, the patterns are all joined to a comma-separated list and
    passed to `guru`'s `-scope` flag.

    Also see |go-guru-scope|.

                                                                  *:GoCallees*
:GoCallees

    Show "callees" relation for a selected package. A list of possible call
    targets for the type under the cursor (or selected package) is shown in a
    location list.

                                                                  *:GoCallers*
:GoCallers

    Show "callers" relation for a selected function. A list of possible
    callers for the selected function under the cursor is shown in a location
    list.

                                                                 *:GoDescribe*
:GoDescribe

    Shows various properties of the selected syntax: its syntactic kind, its
    type (for an expression), its value (for a constant expression), its size,
    alignment, method set and interfaces (for a type), its declaration (for an
    identifier), etc. Almost any piece of syntax may be described, and the
    guru will try to print all the useful information it can.

                                                                *:GoCallstack*
:GoCallstack

    Shows "callstack" relation for the selected function. An arbitrary path
    from the root of the callgraph to the selected function is shown in a
    location list. This may be useful to understand how the function is
    reached in a given program.

                                                                 *:GoFreevars*
:GoFreevars

    Enumerates the free variables of the selection. "Free variables" is a
    technical term meaning the set of variables that are referenced but not
    defined within the selection, or loosely speaking, its inputs.

    This information is useful when considering whether to refactor the
    selection into a function of its own, as the free variables would be the
    necessary parameters of that function. It's also useful when you want to
    understand what the inputs are to a complex block of code even if you
    don’t plan to change it.

                                                             *:GoChannelPeers*
:GoChannelPeers

    Shows the set of possible sends/receives on the channel operand of the
    selected send or receive operation; the selection must be a `<-` token.

    For example, visually select a channel operand in the form of:
>
      done <- true
<
    And call |:GoChannelPeers| on it. It will show where it was allocated, and
    the sending and receiving endings.

                                                                *:GoReferrers*
:GoReferrers

    The referrers query shows the set of identifiers that refer to the same
    object as does the selected identifier, within any package in the analysis
    scope.

                                                                  *:GoSameIds*
:GoSameIds

    Highlights all identifiers that are equivalent to the identifier under the
    cursor.

                                                             *:GoSameIdsClear*
:GoSameIdsClear

    Clears all SameIds highlights from a |:GoSameIds| call.

                                                            *:GoSameIdsToggle*
:GoSameIdsToggle

    Toggle between |:GoSameIds| and |:GoSameIdsClear|.

                                                        *:GoSameIdsAutoToggle*
:GoSameIdsAutoToggle

    Enables or disables automatic highlighting of |:GoSameIds| while moving
    the cursor. This basically toggles the option |'g:go_auto_sameids'|
    on/off.
    If enabled it starts highlighting whenever your cursor is staying at the
    same position for a configurable period of time (see 'updatetime'). If
    disabled it clears and stops automatic highlighting.

                                                               *:GoMetaLinter*
:GoMetaLinter [path]

    Calls the underlying `gometalinter` tool and displays all warnings and
    errors in the |quickfix| window. By default the following linters are
    enabled: `vet`, `golint`, and `errcheck`. This can be changed with the
    |'g:go_metalinter_enabled'| variable. To override the command completely
    use the variable |'g:go_metalinter_command'|. To override the maximum
    linters execution time use |'g:go_metalinter_deadline'| variable.

                                                                *:GoBuildTags*
:GoBuildTags [tags]

    Changes the build tags for various commands. If you have any file that
    uses a custom build tag, such as `//+build integration` , this command can
    be used to pass it to all tools that accepts tags, such as guru, gorename,
    etc..

    The build tags is cleared (unset) if `""` is given. If no arguments is
    given it prints the current custom build tags.

                                                                     *:AsmFmt*
:AsmFmt

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

                                                                *:GoAlternate*
:GoAlternate[!]

    Alternates between the implementation and test code. For example if in
    main.go, switch to main_test.go. Uses the |'g:go_alternate_mode'| setting
    as the command to open the file.

    If [!] is given then it switches to the new file even if it does not
    exist.

    If you would like to override the traditional commands for alternating,
    add the following to your .vimrc:
>
    augroup go
      autocmd!
      autocmd Filetype go
        \  command! -bang A call go#alternate#Switch(<bang>0, 'edit')
        \| command! -bang AV call go#alternate#Switch(<bang>0, 'vsplit')
        \| command! -bang AS call go#alternate#Switch(<bang>0, 'split')
    augroup END
<
                                                                *:GoWhicherrs*
:GoWhicherrs

    Show the list of possible constants, global variables, and concrete types
    for the error type under the cursor in a location list.

                                                                    *:GoDecls*
:GoDecls [file]

    Show all function and type declarations for the current file. If
    [file] is non empty it parses the given file.
    Requires `ctrlp.vim` or `fzf`; it will autodetect the plugin if installed,
    but you can use |'g:go_decls_mode'| to force using one or the other.
    By default `type` and `func` declarations are shown. This can be changed
    via |'g:go_decls_includes'|. Also see |unite-decls|, |denite-decls|.

                                                                 *:GoDeclsDir*
:GoDeclsDir [dir]

    Show all function and type declarations for the current directory. If
    [dir] is given it parses the given directory.

                                                                 *unite-decls*
                                                                *denite-decls*
:Unite decls[:path]
:Denite decls[:path]

    Only enabled if `unite.vim` or `denite.nvim` is installed. Show
    declarations for all functions and types on the current file or directory
    or for [path] if given.

    Note: `denite.nvim` requires NeoVim or Vim 8 with |:python3| enabled.
>
    " show declarations on the parent directory of the current file
    :Unite decls
    :Denite decls

    " show declarations in the file.
    :Unite decls:foo/bar.go
    :Denite decls:foo/bar.go

    " show declarations in the directory "foo".
    :Unite decls:foo
    :Denite decls:foo
<
                                                                     *:GoImpl*
:GoImpl [receiver] [interface]

    Generates method stubs for implementing an interface. If no arguments is
    passed it takes the identifier under the cursor to be the receiver and
    asks for the interface type to be generated. If used with arguments, the
    receiver and the interface needs to be specified. Example usages:
>
      :GoImpl f *Foo io.Writer
      :GoImpl t Type io.ReadWriteCloser
<
                                                                  *:GoAddTags*
:[range]GoAddTags [key],[option] [key1],[option] ...

    Adds field tags for the fields of a struct. If called inside a struct it
    automatically add field tags with the `json` key and the value
    automatically generated based on the field name. An error message is given
    if it's called outside a struct definition or if the file is not correctly
    formatted.

    If [range] is given, only the selected fields will be changed.

    The default `json` can be changed by providing one or more [key]
    arguments. An example of adding `xml` and `db` would be:
>
      :GoAddTags xml db
<
    If [option] is passed it'll either add a new tag with an option or will
    modify existing tags. An example of adding `omitempty` to all `json`
    fields would be:
>
      :GoAddTags json,omitempty
<
    You can define a constant value instead of the default field based value.
    For example the following command will add ``valid:"1"`` to all fields.
>
      :GoAddTags valid=1
<
                                                               *:GoRemoveTags*
:[range]GoRemoveTags [key],[option] [key1],[option1] ...

    Rmove field tags for the fields of a struct. If called inside a struct it
    automatically remove all field tags. An error message is given if it's
    called outside a struct definition or if the file is not correctly
    formatted

    If [range] is given, only the selected fields will be changed.

    If [key] is given, it will only remove those keys. Example:
>
      :GoRemoveTags json
<
    If [option] is passed with a [key], it will only remove the options.
    Example, this will only remove `omitempty` options from fields containing
    `json`:
>
      :GoRemoveTags json,omitempty
<
                                                       *:GoAutoTypeInfoToggle*
:GoAutoTypeInfoToggle

    Toggles |'g:go_auto_type_info'|.

                                                        *:GoFmtAutoSaveToggle*
:GoFmtAutoSaveToggle

    Toggles |'g:go_fmt_autosave'|.

                                                     *:GoAsmFmtAutoSaveToggle*
:GoAsmFmtAutoSaveToggle

    Toggles |'g:go_asmfmt_autosave'|.

                                                 *:GoMetaLinterAutoSaveToggle*
:GoMetaLinterAutoSaveToggle

    Toggles |'g:go_metalinter_autosave'|.

    By default, `gometalinter` messages will be shown in the |location-list|
    window. The list to use can be set using |'g:go_list_type_commands'|.

                                                 *:GoTemplateAutoCreateToggle*
:GoTemplateAutoCreateToggle

    Toggles |'g:go_template_autocreate'|.

                                                               *:GoKeyify*
:GoKeyify

    Uses `keyify` to turn unkeyed struct literals into keyed ones.

    For example:
>
      Person{"John", "Smith"}
<
    Becomes:
>
      Person{
        Name: "John",
        Surname: "Smith",
      }
<
                                                               *:GoFillStruct*
:GoFillStruct

    Use `fillstruct` to fill a struct literal with default values. Existing
    values (if any) are preserved. The cursor must be on the struct you wish
    to fill.

    For example:
>
      addr := net.Address{Name: "Ford Prefect"}
<
    Becomes:
>
      addr := net.Address{
        Name: "Ford Prefect",
        Email: "",
      }
<

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

vim-go has several <Plug> keys which can be used to create custom mappings
For example, to create a mapping that calls `go run` for the current package,
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|. For more information please check out the mappings command
documentation in the |go-commands| section. Available <Plug> keys are:

                                                                    *(go-run)*

Calls `go run` for the current main package

                                                                *(go-run-tab)*

Calls `go run` for the current file in a new terminal tab
This option is neovim only.

                                                              *(go-run-split)*

Calls `go run` for the current file in a new terminal horizontal split
This option is neovim only.

                                                           *(go-run-vertical)*

Calls `go run` for the current file in a new terminal vertical split
This option is neovim only.

                                                                  *(go-build)*

Calls `go build` for the current package

                                                               *(go-generate)*

Calls `go generate` 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-test-func)*

Calls `go test -run '...'` for the test function immediate to cursor

                                                           *(go-test-compile)*

Calls `go test -c` for the current package

                                                               *(go-coverage)*

Calls `go test -coverprofile-temp.out` for the current package and shows the
coverage annotation.

                                                         *(go-coverage-clear)*

Clears the coverage annotation

                                                        *(go-coverage-toggle)*

Calls `go test -coverprofile-temp.out` for the current package and shows the
coverage annotation. If run again it acts as a toggle and clears the
annotation.

                                                                *(go-imports)*

Calls `goimports` for the current package

                                                                   *(go-lint)*

Calls `golint` 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.
Jumps to an existing buffer if |'g:go_def_reuse_buffer'| is enabled.

                                                           *(go-def-vertical)*

Goto declaration/definition. Results are shown in a vertical split window.
Jumps to an existing buffer if |'g:go_def_reuse_buffer'| is enabled.

                                                                *(go-def-tab)*

Goto declaration/definition. Results are shown in a tab window.
Jumps to an existing buffer if |'g:go_def_reuse_buffer'| is enabled.

                                                              *(go-def-stack)*

Shows the godef tag stack

                                                        *(go-def-stack-clear)*

Resets and clears the tag stack

                                                                *(go-def-pop)*

Jump to previous entry in the tag stack

                                                             *(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

                                                                *(go-callers)*

Show possible callers of selected function

                                                               *(go-describe)*

Describe selected syntax: definition, methods, etc

                                                              *(go-callstack)*

Show path from callgraph root to selected function

                                                               *(go-freevars)*

Show free variables of selection

                                                           *(go-channelpeers)*

Show send/receive corresponding to selected channel op

                                                              *(go-referrers)*

Show all refs to entity denoted by selected identifier

                                                             *(go-metalinter)*

Calls `go-metalinter` for the current directory

                                                         *(go-alternate-edit)*

Alternates between the implementation and test code in the current window

                                                        *(go-alternate-split)*

Alternates between the implementation and test code in a new horizontal split

                                                     *(go-alternate-vertical)*

Alternates between the implementation and test code in a new vertical split

                                                                 *(go-import)*

Calls `:GoImport` for the current package


==============================================================================
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. If |'g:go_textobj_include_function_doc'| is
               enabled it also includes the comment doc for a function
               declaration. This text-object also supports literal functions.
               If |'g:go_textobj_include_variable'| is enabled it also
               includes the variable of an function assignment

                                               *go-v_if* *go-if*
if            "inside a function", select contents of a function,
              excluding the function definition and the closing bracket. This
              text-object also supports literal functions


vim-go also defines the following text motion objects:

                                               *go-v_]]* *go-]]*
]]            [count] forward to next function declaration. If
              |'g:go_textobj_include_function_doc'| is enabled and if your
              on a comment, it skips the function which the comment
              belongs and forwards to the next function declaration.

                                               *go-v_[[* *go-[[*
[[            [count] backward to previous function declaration.



==============================================================================
FUNCTIONS                                                       *go-functions*

                                                        *go#statusline#Show()*

Shows the status of a job running asynchronously. Can be used to plug into the
statusline. It works to show the status per package instead of per
file. Assume you have three files open, all belonging to the same package, if
the package build (`:GoBuild`) is successful, all statusline's will show
`success`, if you it fails all file's statusline will show `failed`.

To avoid always showing old status information, the status information is
cleaned for each package after `60` seconds. This can be changed with the
|'g:go_statusline_duration'| setting.

                                                       *go#complete#GetInfo()*

Returns the description of the identifer under the cursor. Can be used to plug
into the statusline.

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

                                                      *'g:go_test_show_name'*

Show the name of each failed test before the errors and logs output by the
test. By default it is disabled.
>
  let g:go_test_show_name = 0
<

                                                         *'g:go_test_timeout'*

Use this option to change the test timeout of |:GoTest|. By default it is
set to 10 seconds . >

  let g:go_test_timeout= '10s'
<
                                                 *'g:go_play_browser_command'*

Browser to use for |:GoPlay| or |:GoDocBrowser|. The url must be added with
`%URL%`, and it's advisable to include `&` to make sure the shell returns. For
example:
>
  let g:go_play_browser_command = 'firefox-developer %URL% &'
<

By default it tries to find it automatically for the current OS. >

  let g:go_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. The delay can be configured with the
'g:go_updatetime' setting.
>
  let g:go_auto_type_info = 0
<

                                                            *'g:go_info_mode'*

Use this option to define the command to be used for |:GoInfo|. By default
`gocode` is being used as it's the fastest option. But one might also use
`guru` as it's covers more cases and is more accurate.  Current valid options
are: `[gocode, guru]` >

  let g:go_info_mode = 'gocode'
<
                                                         *'g:go_auto_sameids'*

Use this option to highlight all uses of the identifier under the cursor
(:GoSameIds) automatically. By default it's disabled. The delay can be
configured with the 'g:go_updatetime' setting.
>
  let g:go_auto_sameids = 0
<
                                                           *'g:go_updatetime'*

Use this option to configure the a custom 'updatetime' for Go source files. If
set to 0, no custom time will be configured. By default it's set to 800ms.
>
  let g:go_updatetime = 800
<
                                                        *'g:go_jump_to_error'*

Use this option to enable/disable passing the bang attribute to the mappings
|(go-build)|, |(go-run)|, etc..  When enabled it will jump to the first error
automatically (means it will NOT pass the bang attribute to the appropriate
command, i.e: (go-run) -> :GoRun ). Note, that calling this doesn't have any
affect on calling the commands manually. This setting is only useful for
changing the behaviour of our custom static mappings. By default it's enabled.
>
  let g:go_jump_to_error = 1
<
                                                         *'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'|. It's
value type can be either a string or a dictionary. This is due backwards
compatibility. The string version will be removed in the future so please use
the dictionary version. Default is empty.
>
  let g:go_fmt_options = ''

  or

  let g:go_fmt_options = {}
<
The dictionary version allows you to define options for multiple binaries:
>
  let g:go_fmt_options = {
    \ 'gofmt': '-s',
    \ 'goimports': '-local mycompany.com',
    \ }
<
                                                    *'g:go_fmt_fail_silently'*

Use this option to disable showing a location list when |'g:go_fmt_command'|
fails. By default the location list is shown. >

  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 slows (creates/deletes a file for every save) and
it's causing problems on some Vim versions. By default it's disabled. >

  let g:go_fmt_experimental = 0
<
                                               *'g:go_doc_keywordprg_enabled'*

Use this option to run `godoc` on words under the cursor with |K|; this will
normally run the `man` program, but for Go using `godoc` is more idiomatic. It
will not override the |'keywordprg'| setting, but will run |:GoDoc|. Default
is enabled. >

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

Maximum height for the GoDoc window created with |:GoDoc|. Default is 20. >

  let g:go_doc_max_height = 20
<

                                                              *'g:go_doc_url'*

godoc server URL used when |:GoDocBrowser| is used. Change if you want to use
a private internal service. Default is 'https://godoc.org'.
>
  let g:go_doc_url = 'https://godoc.org'
<

                                                             *'g:go_def_mode'*

Use this option to define the command to be used for |:GoDef|. By default
`guru` is being used as it covers all edge cases. But one might also use
`godef` as it's faster. Current valid options are: `[guru, godef]` >

  let g:go_def_mode = 'guru'
<
                                                  *'g:go_def_mapping_enabled'*

Use this option to enable/disable the default mapping of CTRL-],
<C-LeftMouse>, g<C-LeftMouse> and (`gd`) for GoDef and CTRL-t for :GoDefPop.
Disabling it allows you to map something else to these keys or mappings.
Default is enabled. >

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

Use this option to jump to an existing buffer for the split, vsplit and tab
mappings of |:GoDef|. By default it's disabled. >

  let g:go_def_reuse_buffer = 0
<
                                                          *'g:go_doc_command'*

Command to use for |:GoDoc|; only used when invoked with a package name. The
`gogetdoc` command is always used when |:GoDoc| is used on the identifier
under the cursor (i.e. without argument or from |K|). >

  let g:go_doc_command = ["godoc"]

<                                                            *'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'*

Define the snippet engine to use. The default is to auto-detect one. Valid
values are:

  automatic      Automatically detect a snippet engine.
  ultisnips      https://github.com/SirVer/ultisnips
  neosnippet     https://github.com/Shougo/neosnippet.vim
  minisnip       https://github.com/joereynolds/vim-minisnip
                 Note: the original at KeyboardFire/vim-minisnip won't work.
>
  let g:go_snippet_engine = "automatic"
<
                                                           *'g:go_get_update'*

Use this option to disable updating dependencies with |:GoInstallBinaries|. By
default this is enabled.
>
  let g:go_get_update = 1
<
                                                           *'g:go_guru_scope'*

Use this option to define the scope of the analysis to be passed for guru
related commands, such as |:GoImplements|, |:GoCallers|, etc. You can change
it on-the-fly with |:GoGuruScope|. The input should be a a list of package
pattern. An example input might be:
`["github.com/fatih/color","github.com/fatih/structs"]`

Also see |go-guru-scope|.

By default it's not set, so the relevant commands defaults are being used.
>
  let g:go_guru_scope = []
<
                                                           *'g:go_build_tags'*

These options that will be automatically passed to the `-tags` option of
various tools, such as `guru`, `gorename`, etc... This is a permanent
setting. A more useful way is to use |:GoBuildTags| to dynamically change or
remove build tags. By default it's not set.
>
  let g:go_build_tags = ''
<
                                                    *'g:go_autodetect_gopath'*

Automatically modify GOPATH for certain directory structures, such as for
the `godep` tool which stores dependencies in the `Godeps` folder. What this
means is that all tools are now working with the newly modified GOPATH. So
|:GoDef| for example jumps to the source inside the `Godeps` (vendored)
source. Currently `godep` and `gb` are supported. By default it's disabled.
>
  let g:go_autodetect_gopath = 0
<
                                                      *'g:go_textobj_enabled'*

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

  let g:go_textobj_enabled = 1
<
                                         *'g:go_textobj_include_function_doc'*

Consider the comment above a function to be part of the function when using
the `af` text object and `[[` motion. By default it's enabled. >

  let g:go_textobj_include_function_doc = 1
<
                                             *'g:go_textobj_include_variable'*

Consider the variable of an function assignment to be part of the anonymous
function when using the `af` text object. By default it's enabled. >

  let g:go_textobj_include_variable = 1
<
                                                  *'g:go_metalinter_autosave'*

Use this option to auto |:GoMetaLinter| on save. Only linter messages for
the active buffer will be shown.

By default, `gometalinter` messages will be shown in the |location-list|
window. The list to use can be set using |'g:go_list_type_commands'|.

 By default it's disabled >
  let g:go_metalinter_autosave = 0
<
                                          *'g:go_metalinter_autosave_enabled'*

Specifies the enabled linters for auto |:GoMetaLinter| on save. By
default it's using `vet` and `golint`.
>
  let g:go_metalinter_autosave_enabled = ['vet', 'golint']
<
                                                   *'g:go_metalinter_enabled'*

Specifies the linters to enable for the |:GoMetaLinter| command. By default
it's using `vet`, `golint` and `errcheck`.
>
  let g:go_metalinter_enabled = ['vet', 'golint', 'errcheck']
<
                                                  *'g:go_metalinter_disabled'*

Specifies the linters to disable for the |:GoMetaLinter| command. By default
it's empty
>
  let g:go_metalinter_disabled = []
<
                                                   *'g:go_metalinter_command'*

Overrides the command to be executed when |:GoMetaLinter| is called. This is
an advanced settings and is for users who want to have a complete control
over how `gometalinter` should be executed. By default it's empty.
>
  let g:go_metalinter_command = ""
<
                                                  *'g:go_metalinter_deadline'*

Overrides the maximum time the linters have to complete. By default it's 5
seconds.
>
  let g:go_metalinter_deadline = "5s"
<
                                                          *'g:go_list_height'*

Specifies the window height for the quickfix and location list windows. The
default value (empty) automatically sets the height to the number of items
(maximum up to 10 items to prevent large heights). Setting the value
explicitly overrides this behavior. For standard Vim behavior, set it to 10.
>
  let g:go_list_height = 0
<
                                                            *'g:go_list_type'*

Specifies the type of list to use for command outputs (such as errors from
builds, results from static analysis commands, etc...). The list type for
specific commands can be overridden with |'g:go_list_type_commands'|. The
default value (empty) will use the appropriate kind of list for the command
that was called. Supported values are "", "quickfix", and "locationlist".
>
  let g:go_list_type = ""
<

                                                   *'g:go_list_type_commands'*

Specifies the type of list to use for command outputs (such as errors from
builds, results from static analysis commands, etc...). When an expected key
is not present in the dictionary, |'g:go_list_type'| will be used instead.
Supported keys are "GoBuild", "GoErrCheck", "GoFmt", "GoInstall", "GoLint",
"GoMetaLinter", "GoMetaLinterAutoSave", "GoModifyTags" (used for both
:GoAddTags and :GoRemoveTags), "GoRename", "GoRun", and "GoTest".  Supported
values for each command are "quickfix" and "locationlist".
>
  let g:go_list_type_commands = {}
<
As an example, the following settings will change all list types to
`locationlist` except for `:GoBuild` where `quickfix` is used:
>
  let g:go_list_type = "locationlist"
  let g:go_list_type_commands = {"GoBuild": "quickfix"}
<

                                                       *'g:go_list_autoclose'*

Specifies whether the quickfix/location list should be closed automatically
in the absence of errors.  The default value is 1.
If you prefer to keep a long running error window open, you can disable
this by setting the value to 0.
>
  let g:go_list_autoclose = 1
<
                                                      *'g:go_asmfmt_autosave'*

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

  let g:go_asmfmt_autosave = 0
<
                                                            *'g:go_term_mode'*

This option is Neovim only. Use it to change the default command used to
open a new terminal for go commands such as |:GoRun|.
The default is vsplit.
>
  let g:go_term_mode = "vsplit"
<
                                                          *'g:go_term_height'*
                                                           *'g:go_term_width'*

These options are Neovim only. Use them to control the height and width of
a terminal split. By default these are not set, meaning that the height and
width are set automatically by Neovim. The height only applies to a
horizontal split and width only applies to a vertical split.

For example here is how to set each to 30.
>
  let g:go_term_height = 30
  let g:go_term_width = 30
<
                                                         *'g:go_term_enabled'*

This option is Neovim only. Use it to change the behavior of the test
commands. If set to 1 it opens the test commands inside a new terminal
according to |'g:go_term_mode'|, otherwise it will run them in the background
just like `:GoBuild`. By default it is disabled.
>
  let g:go_term_enabled = 0
<
                                                       *'g:go_alternate_mode'*

Specifies the command that |:GoAlternate| uses to open the alternate file.
By default it is set to edit.
>
  let g:go_alternate_mode = "edit"
<
                                                     *'g:go_gorename_prefill'*

Expression to prefill the new identifier when using |:GoRename| without any
arguments. Use an empty string if you don't want to prefill anything. By
default it converts the identifier to camel case but preserves the
capitalisation of the first letter to ensure that the exported state stays the
same.
>
  let g:go_gorename_prefill = 'expand("<cword>") =~# "^[A-Z]"' .
        \ '? go#util#pascalcase(expand("<cword>"))' .
        \ ': go#util#camelcase(expand("<cword>"))'
<
                                                     *'g:go_gocode_autobuild'*

Specifies whether `gocode` should automatically build out-of-date packages
when their source fields are modified, in order to obtain the freshest
autocomplete results for them.  By default it is enabled.
>
  let g:go_gocode_autobuild = 1
<
                                              *'g:go_gocode_propose_builtins'*

Specifies whether `gocode` should add built-in types, functions and constants
to an autocompletion proposals. By default it is enabled.
>
  let g:go_gocode_propose_builtins = 1
<
                                           *'g:go_gocode_unimported_packages'*

Specifies whether `gocode` should include suggestions from unimported
packages. By default it is disabled.
>
  let g:go_gocode_unimported_packages = 0
<

                                                   *'g:go_gocode_socket_type'*

Specifies whether `gocode` should use a different socket type. By default
`unix` is enabled. Possible values: `unix`, `tcp`
>
  let g:go_gocode_socket_type = 'unix'
<
                                                  *'g:go_template_autocreate'*

When a new Go file is created, vim-go automatically fills the buffer content
with a Go code template. By default, the templates under the `templates`
folder are used.  This can be changed with the |'g:go_template_file'| and
|'g:go_template_test_file'| settings.

If the new file is created in an already prepopulated package (with other Go
files), in this case a Go code template with only the Go package declaration
(which is automatically determined according to the current package) is added.

To always use the package name instead of the template, enable the
|'g:go_template_use_pkg'| setting.

By default it is enabled.
>
  let g:go_template_autocreate = 1
<
                                                        *'g:go_template_file'*

Specifies the file under the `templates` folder that is used if a new Go file
is created. Checkout |'g:go_template_autocreate'| for more info. By default
the `hello_world.go` file is used.
>
  let g:go_template_file = "hello_world.go"
<
                                                   *'g:go_template_test_file'*

Specifies the file under the `templates` folder that is used if a new Go test
file is created. Checkout |'g:go_template_autocreate'| for more info. By
default the `hello_world_test.go` file is used.
>
  let g:go_template_test_file = "hello_world_test.go"
<
                                                     *'g:go_template_use_pkg'*

Specifies that, rather than using a template, the package name is used if a
new Go file is created. Checkout |'g:go_template_autocreate'| for more info.
By default the template file specified by |'g:go_template_file'| is used.

>
  let g:go_template_use_pkg = 0
<
                                                       *'g:go_decls_includes'*

Only useful if `ctrlp.vim`, `unite.vim`, `denite.nvim` or `fzf` are installed.
This sets which declarations to show for |:GoDecls| (`ctrp.vim`),
|unite-decls| (`unite.vim`) and |denite-decls| (`denite.nvim`).  It is a Comma
delimited list.  Possible options are: {func,type}.  The default is: >

      let g:go_decls_includes = 'func,type'
<
                                                       *'g:go_decls_mode'*

Define the tool to be used for |:GoDecls|. Valid options are `ctrlp.vim`,
`fzf`, or an empty string; in which case it will try to autodetect either
`ctrlp.vim` or `fzf`.
>
      let g:go_decls_mode = ''
<
                                                    *'g:go_echo_command_info'*

Echoes information about various Go commands, such as `:GoBuild`, `:GoTest`,
`:GoCoverage`, etc... Useful to disable if you use the statusline integration,
i.e: |go#statusline#Show()|. By default it's enabled
>
      let g:go_echo_command_info = 1
<
                                                       *'g:go_echo_go_info'*

Use this option to show the identifier information when completion is done. By
default it's enabled >

      let g:go_echo_go_info = 1
<
Please note that 'noshowmode' must be set for this feature to work correctly.

                                                  *'g:go_statusline_duration'*

Specifies the duration of statusline information being showed per package. By
default it's 60 seconds. Must be in milliseconds.
>
      let g:go_statusline_duration = 60000
<
                                                   *'g:go_addtags_transform'*

Sets the `transform` option for `gomodifytags` when using |:GoAddTags| or if
it's being used for snippet expansion of single fields.  Possible options are:
`snakecase`, `camelcase`. For the following case, if `snakecase` is used the
field will be transformed to:
>
  type T struct {
    FooBarQuz string `json:"foo_bar_quz"
  }
<

If "camelcase" is used:
>
  type T struct {
    FooBarQuz string `json:"fooBarQuz"
  }
<
By default "snakecase" is used. Current values are: ["snakecase",
"camelcase"].
>
      let g:go_addtags_transform = 'snakecase'
<
                                                                *'g:go_debug'*

A list of options to debug; useful for development and/or reporting bugs.

Currently accepted values:

  debugger-state     Expose debugger state in 'g:go_debug_diag'.
  debugger-commands  Echo communication between vim-go and `dlv`; requests and
                     responses are recorded in `g:go_debug_commands`.
>
      let g:go_debug = []
<

==============================================================================
SYNTAX HIGHLIGHTING                                 *ft-go-syntax* *go-syntax*

vim-go comes with an enhanced version of Vim's Go syntax highlighting. It
comes with a number of features, most of which are disabled by default.

The recommended settings are the default values. If you're experiencing
slowdowns in Go files and you enabled some of these options then try disabling
them; some can be resource intensive.

                                                          *'g:go_fold_enable'*

Control syntax-based folding which takes effect when 'foldmethod' is set to
`syntax`.
You can enable specific fold regions by setting an array. Possible values are:

 block                `{` .. `}` blocks.
 import               `import` block.
 varconst             `var` and `const` blocks.
 package_comment      The package comment.
 comment              Any comment that is not the package comment.

By default all except "comment" are enabled:
>
  let g:go_fold_enable = ['block', 'import', 'varconst', 'package_comment']
<
Enable folding of only imports:
>
  let g:go_fold_enable = ['import']
<
Disable everything (same as not setting 'foldmethod' to `syntax`):
>
  let g:go_fold_enable = []
<
                                     *'g:go_highlight_array_whitespace_error'*

Highlight white space after `[]`. >

  let g:go_highlight_array_whitespace_error = 0
<
                                      *'g:go_highlight_chan_whitespace_error'*

Highlight white space around the receive operator (`<-`) that doesn't follow
the standard style. >

  let g:go_highlight_chan_whitespace_error = 0
<
                                                *'g:go_highlight_extra_types'*

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

  let g:go_highlight_extra_types = 0
<
                                            *'g:go_highlight_space_tab_error'*

Highlight instances of tabs following spaces. >

  let g:go_highlight_space_tab_error = 0
<
                                  *'g:go_highlight_trailing_whitespace_error'*

Highlight trailing white space. >

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

Highlight operators such as `:=` , `==`, `-=`, etc.
>
  let g:go_highlight_operators = 0
<
                                                  *'g:go_highlight_functions'*

Highlight function and method declarations.
>
  let g:go_highlight_functions = 0
<
                                         *'g:go_highlight_function_arguments'*

Highlight the variable names in arguments and return values in function
declarations. Setting this implies the functionality from
|'g:go_highlight_functions'|.
>
  let g:go_highlight_function_arguments = 0
<
                                             *'g:go_highlight_function_calls'*

Highlight function and method calls.
>
  let g:go_highlight_function_calls = 0
<
                                                      *'g:go_highlight_types'*

Highlight struct and interface names.
>
  let g:go_highlight_types = 0
<
                                                     *'g:go_highlight_fields'*

Highlight struct field names.
>
  let g:go_highlight_fields = 0
<
                                          *'g:go_highlight_build_constraints'*

Highlights build constraints.
>
  let g:go_highlight_build_constraints = 0
<
                                              *'g:go_highlight_generate_tags'*

Highlight go:generate directives.
>
  let g:go_highlight_generate_tags = 0
<
                                          *'g:go_highlight_string_spellcheck'*

Highlight spelling errors in strings when |spell| is enabled.
>
  let g:go_highlight_string_spellcheck = 1
<
                                             *'g:go_highlight_format_strings'*

Highlight printf-style formatting verbs inside string literals.
>
  let g:go_highlight_format_strings = 1
<
                                      *'g:go_highlight_variable_declarations'*

Highlight variable names in variable declarations (`x` in ` x :=`).
>
  let g:go_highlight_variable_declarations = 0
<
                                       *'g:go_highlight_variable_assignments'*

Highlight variable names in variable assignments (`x` in `x =`).
>
  let g:go_highlight_variable_assignments = 0
<

==============================================================================
                                           *gohtmltmpl* *ft-gohtmltmpl-syntax*
                                           *gotexttmpl* *ft-gotexttmpl-syntax*
Go template syntax~

The `gotexttmpl` 'filetype' provides syntax highlighting and indentation for
Go's `text/template` package.

The `gohtmltmpl` filetype is for use with the `html/template` package and is
identical to `gotexttmpl` except that it will also load the standard `html`
filetype.

The `gohtmltmpl` filetype is automatically set for `*.tmpl` files; the
`gotexttmpl` is never automatically set and needs to be set manually.


==============================================================================
DEBUGGER                                                            *go-debug*

Vim-go comes with a special "debugger mode". This starts a `dlv` process in
the background and provides various commands to communicate with it.

This debugger is similar to Visual Studio or Eclipse and has the following
features:

  * Show stack trace and jumps.
  * List local variables.
  * List function arguments.
  * Expand values of struct or array/slice.
  * Show balloon on the symbol.
  * Show output of stdout/stderr.
  * Toggle breakpoint.
  * Stack operation continue/next/step out.

This feature requires Vim 8.0.0087 or newer with the |+job| feature. Neovim
does _not_ work (yet).
This requires Delve 1.0.0 or newer, and it is recommended to use Go 1.10 or
newer, as its new caching will speed up recompiles.

                                                              *go-debug-intro*
GETTING STARTED WITH THE DEBUGGER~

Use |:GoDebugStart| or |:GoDebugTest| to start the debugger. The first
argument is the package name, and any arguments after that will be passed on
to the program; for example:
>
    :GoDebugStart . -someflag value
<
This may take few seconds. After the code is compiled you'll see three new
windows: the stack trace on left side, the variable list on the bottom-left,
and program output at the bottom.

You can add breakpoints with |:GoDebugBreakpoint| (<F9>) and run your program
with |:GoDebugContinue| (<F5>).

The program will halt on the breakpoint, at which point you can inspect the
program state. You can go to the next line with |:GoDebugNext| (<F10>) or step
in with |:GoDebugStep| (<F11>).

The variable window in the bottom left (`GODEBUG_VARIABLES`) will display all
local variables. Struct values are displayed as `{...}`, array/slices as
`[4]`. Use <CR> on the variable name to expand the values.

The `GODEBUG_OUTPUT` window displays output from the program and the Delve
debugger.

The `GODEBUG_STACKTRACE` window can be used to jump to different places in the
call stack.

When you're done use |:GoDebugStop| to close the debugging windows and halt
the `dlv` process, or |:GoDebugRestart| to recompile the code.

                                                           *go-debug-commands*
DEBUGGER COMMANDS~

Only |:GoDebugStart| and |:GoDebugBreakpoint| are available by default; the
rest of the commands and mappings become available after starting debug mode.

                                                               *:GoDebugStart*
:GoDebugStart [pkg] [program-args]

    Start the debug mode for [pkg]; this does several things:

      * Setup the debug windows according to |'g:go_debug_windows'|.
      * Make the `:GoDebug*` commands and `(go-debug-*)` mappings available.

    The current directory is used if [pkg] is empty. Any other arguments will
    be passed to the program.

    Use |:GoDebugStop| to stop `dlv` and exit debugging mode.

                                                                *:GoDebugTest*
:GoDebugTest [pkg] [program-args]

    Behaves the same as |:GoDebugStart| but runs `dlv test` instead of
    `dlv debug` so you can debug tests.

    Use `-test.flag` to pass flags to `go test` when debugging a test; for
    example `-test.v` or `-test.run TestFoo`


                                                             *:GoDebugRestart*
:GoDebugRestart

    Stop the program (if running) and restart `dlv` to recompile the package.
    The current window layout and breakpoints will be left intact.

                                                                *:GoDebugStop*
                                                             *(go-debug-stop)*
:GoDebugStop

    Stop `dlv` and remove all debug-specific commands, mappings, and windows.

                                                          *:GoDebugBreakpoint*
                                                       *(go-debug-breakpoint)*
:GoDebugBreakpoint [linenr]

    Toggle breakpoint for the [linenr]. [linenr] defaults to the current line
    if it is omitted. A line with a breakpoint will have the
    {godebugbreakpoint} |:sign| placed on it. The line the program is
    currently halted on will have the {godebugcurline} sign.

                                    *hl-GoDebugCurrent* *hl-GoDebugBreakpoint*
    A line with a breakpoint will be highlighted with the {GoDebugBreakpoint}
    group; the line the program is currently halted on will be highlighted
    with {GoDebugCurrent}.

    Mapped to <F9> by default.

                                                            *:GoDebugContinue*
                                                         *(go-debug-continue)*
:GoDebugContinue

    Continue execution until breakpoint or program termination. It will start
    the program if it hasn't been started yet.

    Mapped to <F5> by default.

                                                                *:GoDebugNext*
                                                             *(go-debug-next)*
:GoDebugNext

    Advance execution by one line, also called "step over" by some other
    debuggers.
    It will behave as |:GoDebugContinue| if the program isn't started.

    Mapped to <F10> by default.

                                                                *:GoDebugStep*
                                                             *(go-debug-step)*
:GoDebugStep

    Advance execution by one step, stopping at the next line of code that will
    be executed (regardless of location).
    It will behave as |:GoDebugContinue| if the program isn't started.

    Mapped to <F11> by default.

                                                             *:GoDebugStepOut*
                                                          *(go-debug-stepout)*

:GoDebugStepOut

    Run all the code in the current function and halt when the function
    returns ("step out of the current function").
    It will behave as |:GoDebugContinue| if the program isn't started.

                                                                 *:GoDebugSet*
:GoDebugSet {var} {value}

    Set the variable {var} to {value}. Example:
>
      :GoDebugSet truth 42
<
    This only works for `float`, `int` and variants, `uint` and variants,
    `bool`, and pointers (this is a `delve` limitation, not a vim-go
    limitation).

                                                               *:GoDebugPrint*
                                                            *(go-debug-print)*
:GoDebugPrint {expr}

    Print the result of a Go expression.
>
    :GoDebugPrint truth == 42
    truth == 42 true
<
    Mapped to <F6> by default, which will evaluate the <cword> under the
    cursor.

                                                           *go-debug-settings*
DEBUGGER SETTINGS~

                                                        *'g:go_debug_windows'*

Controls the window layout for debugging mode. This is a |dict| with three
possible keys: "stack", "out", and "vars"; the windows will created in that
order with the commands in the value.
A window will not be created if a key is missing or empty.

Defaults:
>
  let g:go_debug_windows = {
        \ 'stack': 'leftabove 20vnew',
        \ 'out':   'botright 10new',
        \ 'vars':  'leftabove 30vnew',
  \ }
<
Show only variables on the right-hand side: >

  let g:go_debug_windows = {
        \ 'vars':  'rightbelow 60vnew',
  \ }
<
                                                        *'g:go_debug_address'*

Server address `dlv` will listen on; must be in `hostname:port` format.
Defaults to `127.0.0.1:8181`:
>
  let g:go_debug_address = '127.0.0.1:8181'
<

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

I get "not an editor command" error when I invoke :GoXXX~

This happens if vim-go is not installed properly. Be sure you have added this
line into your vimrc:
>
  filetype plugin indent on
<

I get a "command not found" error when I invoke :GoXXX~

If you try to call |:GoDef|, |:GoInfo| and get a command not found, check that
you have the binaries installed by using |:GoInstallBinaries|.

Before opening vim, check your current $PATH:
>
  echo $PATH
<
After opening vim, run `:echo $PATH`, the output must be your current `$PATH`
plus `$GOPATH/bin` (the location where |:GoInstallBinaries| installed the
binaries).

                                                               *go-guru-scope*
What is the guru scope and how do I set it?~

Many vim-go commands use the `guru` commandline tool to get information. Some
`guru` commands require an expensive analysis of the source code. To still get
a reasonable amount of performance `guru` limits this analysis to a selected
list of packages. This is known as the "guru scope".

The default is to use the package the curent buffer belongs to, but this may
not always be correct. For example for the file `guthub.com/user/pkg/a/a.go`
the scope will be set to `github.com/user/pkg/a`, but you probably want
`github.com/user/pkg`

Guessing what package(s) you do want is not easy so you may need to set this
manually, usually from an |autocommand|:
>
  autocmd BufRead /home/martin/go/src/github.com/user/pkg/*.go
        \ :GoGuruScope github.com/user/pkg
<

If you have a lot of packages with the same prefix (`github.com/user`) you can
use a single autocommand:
>
  autocmd BufRead /home/martin/go/src/*.go
        \  let s:tmp = matchlist(expand('%:p'),
            \ '/home/martin/go/src/\(github.com/user/[^/]\+\)')
        \| if len(s:tmp) > 1 |  exe 'silent :GoGuruScope ' . s:tmp[1] | endif
        \| unlet s:tmp
<
Also see |:GoGuruScope| and |'g:go_guru_scope'|.


Vim becomes slow while editing Go files~

This is usually caused by `g:go_highlight_*` options. Try disabling them if
you've enabled some of them.

Other common culprits are |'g:go_auto_sameids'| and |go#statusline#Show()|.


I get errors when using GoInstallBinaries~

If you see errors like this:
>
  Error installing golang.org/x/tools/cmd/goimports
<
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 golang.org/x/tools/cmd/goimports
<
You'll see a more detailed error. If this works, vim-go will work too.


I want to use a different binary name than "go", can I do this?~

There is no way to directly configure the binary name; but you can use a
wrapper script; for example if you would like to run `goapp` instead of `go`:

1. In `~/gobin/go` (remember to make it executable):
>
     #!/bin/sh
     # Remove gobin from PATH and run goapp.
     PATH=${PATH#$HOME/gobin} goapp "$@"
<
2. Start Vim with `~/gobin` as the first `PATH` entry so it will use the
   wrapper script:
>
     PATH="$HOME/gobin/:$PATH" vim
<
   Alternatively you you could set `$PATH` in your vimrc with an |:autocmd|.


How do I use vim-go 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']
 let g:syntastic_mode_map = { 'mode': 'active', 'passive_filetypes': ['go'] }
<
If you want to add errcheck you can use gometalinter as a wrapper
>
 let g:syntastic_go_checkers = ['golint', 'govet', 'gometalinter']
 let g:syntastic_go_gometalinter_args = ['--disable-all', '--enable=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"
<

How do I run focused ginkgo tests?~

You must set this environment variable in your `.vimrc`:
>
  let $GINKGO_EDITOR_INTEGRATION = "true"
<

Using with NeoVim~

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"
>

==============================================================================
DEVELOPMENT                                               *go-development*

vim-go supports test files written in VimScript; the way they're run is
roughly similar to Go tests:

- A `*.vim` file has a corresponding `*_test.vim`.
- All functions starting with `Test_` are run as test.
- A test is considered to be "failed" if |v:errors| has any entries. You can
  use one of the |test-functions| to set this, or append to it directly.

A simple example:
>
 function Test_run_fmt()
   call assert_equal(expected, actual)
   ...
 endfunction
<
To run tests vim-go comes with three small helper scripts:

  `scripts/install-vim`   Install a pristine Vim to `/tmp/vim-go-test/`.
  `scripts/run-vim`       Run a Vim version from `/tmp/vim-go-test/`.
  `scripts/test`          Run all tests with a Vim from `/tmp/vim-go-test/`.

All scripts accept a Vim version as the first argument, which can be
`vim-7.4`, `vim-8.0`, or `nvim`. You will need to install a Vim version with
`install-vim` before you can use `run-vim` or `test`.

You can install and test all Vim versions by running `make`.


==============================================================================
DONATION                                                         *go-donation*

People have asked for this for a long time, now you can be a fully supporter
by being a patreon at: https://www.patreon.com/fatih

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!

Check it out: https://www.patreon.com/fatih


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

* Go Authors for official Vim plugins.
* Gocode, Godef, Golint, Guru, 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 tw=78 et ts=2 sw=2 sts=2 norl