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spacemacs/layers/+lang/go
syl20bnr 74fdbb6795 Refactor and simplify company backends declaration
Enabling a company backend for a specific mode was a tedious tasks with code
scattered at different locations, one for local variable definitions, one for
company hook function definitions and another where the backends were pushed to
the local variables (which was problematic, since we ended up pushing the same
backends over and over again with `SPC f e R`, pushes have been replaced by
add-to-list calls in the new macro).

All these steps are now put together at one place with the new macro
spacemacs|add-company-backends, check its docstring for more info on its
arguments.

This macro also allows to define arbitrary buffer local variables to tune
company for specific modes (similar to layer variables via a keyword :variables)

The code related to company backends management has been moved to the
auto-completion layer in the funcs.el file. A nice side effect of this move is
that it enforces correct encapsulation of company backends related code. We can
now easily detect if there is some configuration leakage when the
auto-completion layer is not used. But we loose macro expansion at file loading
time (not sue it is a big concern though).

The function spacemacs|enable-auto-complete was never used so it has been
deleted which led to the deletion of the now empty file core-auto-completion.el.

The example in LAYERS.org regarding auto-completion is now out of date and has
been deleted. An example to setup auto-completion is provided in the README.org
file of the auto-completion layer.
2017-01-02 00:39:04 -05:00
..
img Use + instead of ! for layer categories 2015-09-11 00:13:51 -04:00
local/go-rename Fix usage of gorename on symlinked projects 2016-10-17 13:33:35 +02:00
config.el Refactor and simplify company backends declaration 2017-01-02 00:39:04 -05:00
funcs.el go: use :toggle for flycheck-gometalinter package 2016-04-29 22:58:23 -04:00
packages.el Refactor and simplify company backends declaration 2017-01-02 00:39:04 -05:00
README.org update docs with go-guru info 2016-10-17 13:36:40 +02:00

GO layer

/TakeV/spacemacs/media/commit/74fdbb6795018a93a665fa2c417589cd4cbd51fc/layers/+lang/go/img/go.png

Description

This layer adds extensive support for go.

Features:

  • gofmt/goimports on file save
  • Auto-completion using go-autocomplete (with the auto-completion layer)
  • Source analysis using go-guru
  • Linting with flycheck's built-in checkers or flycheck-gometalinter
  • Coverage profile visualization

Install

Pre-requisites

You will need gocode and godef:

  go get -u -v github.com/nsf/gocode
  go get -u -v github.com/rogpeppe/godef
  go get -u -v golang.org/x/tools/cmd/guru
  go get -u -v golang.org/x/tools/cmd/gorename
  go get -u -v golang.org/x/tools/cmd/goimports

If you wish to use gometalinter set the value of go-use-gometalinter to t:

  (go :variables go-use-gometalinter t)

and install the tool:

  go get -u -v github.com/alecthomas/gometalinter
  gometalinter --install --update

For more information read gometalinter README.md and flycheck-gometalinter README.md

Make sure that gocode executable is in your PATH. For information about setting up $PATH, check out the corresponding section in the FAQ (SPC h SPC $PATH RET).

For best results, make sure that the auto-completion and syntax-checking layers are enabled as well.

Layer

To use this configuration layer, add it to your ~/.spacemacs. You will need to add go to the existing dotspacemacs-configuration-layers list in this file.

Configuration

By default, go buffers are run through gofmt on save. To use a different formatter, set the value of gofmt-command, e.g.

  (setq gofmt-command "goimports")

or

  (go :variables gofmt-command "goimports")

Indentation

By default, the tab width in Go mode is 8 spaces. To use a different value set the layer variable go-tab-width, e.g.

  (go :variables go-tab-width 4)

Tests

If you're using gocheck in your project you can use the go-use-gocheck-for-testing variable to enable suite testing and to get single function testing to work.

go-coverage-display-buffer-func controls how go-coverage should display the coverage buffer. See display-buffer for a list of possible functions. The default value is display-buffer-reuse-window.

Guru

Go Oracle has been deprecated as of October 1, 2016, it's replacement is go-guru.

If you would like to use the goguru bindings in your work, you will need to install it, and in your project you will need to set the scope with SPC m f o. The scope is a comma separated set of packages, and go's recursive operator is supported. In addition, you can prefix with - to exclude a package from searching.

In addition, GOPATH must be set prior to go-guru initialization.

Working with Go

Go commands (start with m):

Key Binding Description
SPC m h h godoc at point
SPC m i g goto imports
SPC m i a add import
SPC m i r remove unused import
SPC m e b go-play buffer
SPC m e r go-play region
SPC m e d download go-play snippet
SPC m x x run "go run" for the current 'main' package
SPC m g a jump to matching test file or back from test to code file
SPC m g c open a clone of the current buffer with a coverage info (go tool cover -h for help)
SPC m g g go jump to definition
SPC m r n go rename
SPC m t p run "go test" for the current package
SPC m t P run "go test" for the current package and all packages under it
SPC m t t run "go test" for the function you're currently in (while you're in a _.test.go file)
SPC m t s run "go test" for the suite you're currently in (requires gocheck)

Go Guru

Key Binding Description
SPC m f d go-guru describe symbol at point
SPC m f f go-guru show free variables
SPC m f i go-guru show implements relation
SPC m f c go-guru show channel sends/receives
SPC m f r go-guru show referrers
SPC m f j go-guru jump to symbol definition
SPC m f p go-guru show what the select expression points to
SPC m f s go-guru show callstack
SPC m f e go-guru show possible contants/types for error value
SPC m f < go-guru show possible callers
SPC m f > go-guru show call targets
SPC m f o go-guru set analysis scope