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Vim plugin for the Go programming language
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README.markdown
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README.markdown

This project is considered experimental Build Status codecov

gopher.vim is a Vim plugin for the Go programming language.

Goals:

  • Vendor external dependencies in the plugin.
  • Off-load functionality to native Vim features or generic plugins when they offer a good user experience.
  • Ensure that included commands are well-tested to work with as many possible scenarios as possible.

Installation

Installation can be done using the usual suspects. Vim 8.0.400 or Neovim 0.2.0 are supported; older versions may work but are not supported.

This plugin requires Go 1.11 or newer; older versions will not work as the internal vendoring uses modules.

Installation of external tools is done automatically on first usage, but can be done manually with :GoSetup.

Getting started

Compiling code and running tests is provided with the go and gotest compilers. By default the compiler is set to go ; you can switch it to gotest with :comp gotest.

You can now use :make to compile the code. This is a synchronous process. You can use :MakeJob from vim-makejob to run it async, similar to :GoInstall, :GoTest, etc.

Running go generate or passing -run to :GoTest can be done by switching the makeprg setting:

:comp gotest
:make -run TestX

:comp go
:set makeprg=go\ generate
:make

You could even set makeprg to just go:

:set makeprg=go
:make install
:make run main.go
...

All motions that work in vim-go also work in gopher.vim: [[, ]], af, etc.

Overview of over commands:

  • :GoCoverage – Highlight code coverage.
  • :GoRename – Rename identifier under cursor.
  • :GoTags – Add or remove struct tags
  • :GoGuru – Get various information using the guru command.
  • :GoImport – Add, modify, or remove imports.

See FEATURES.markdown for a translation of vim-go features.

See :help gopher for the full reference manual.

Companion plugins

A list of useful companion plugins; this is not an exhaustive list, but rather a "most useful" list. For many alternatives exist as well; I didn't test all options.

Other resources

Tips

Some things you can stick in your vimrc:

augroup my_gopher
    au!

    " Quicker way to make, lint, and test code.
    " au FileType go nnoremap MM :wa<CR>:compiler go<CR>:silent make!<CR>:redraw!<CR>
    " au FileType go nnoremap LL :wa<CR>:compiler golint<CR>:silent make!<CR>:redraw!<CR>
    " au FileType go nnoremap TT :wa<CR>:compiler gotest<CR>:silent make!<CR>:redraw!<CR>

    " Lint on write.
    " autocmd BufWritePost *.go compiler golint | silent make! | redraw!

    " Put a path before GOPATH, to use binaries from there (not recommended
    " unless you have special needs or want to test a modified version of a
    " tool!)
    " autocmd Filetype go let $PATH = $HOME . '/go/bin:' . $PATH

    " Format buffer on write; need to make a motion for the entire buffer to
    " make this work.
    " Use e.g. ALE or Syntastic for a more advanced experience.
    " autocmd BufWritePre *.go
    "             \  let s:save = winsaveview()
    "             \| exe 'keepjumps %!goimports 2>/dev/null || cat /dev/stdin'
    "             \| call winrestview(s:save)
augroup end

History and rationale

I started this repository as a test case for internally vendoring of tools; in vim-go confusion due to using the wrong version of an external tool (too old or new) can be common; people have to manually run :GoUpdateBinaries, and if an external tool changes the developers have to scramble to update vim-go to work.

I wanted to experiment with a different approach: it vendors external tools in the plugin directory and runs those. This way the correct version is always used. Since this directory is prepended to $PATH other plugins (such as ALE) will also use these vendored tools.

Overall, this seems to work quite well. Starting with a clean slate made it a lot easier to develop this as a proof-of-concept.

A second reason was to see how well a Go plugin would work without adding a lot of "generic" functionality. A lot of effort in vim-go is spent on stuff like completion, linting, and other features that are "generic" and not specific to Go. I've never used vim-go's linting or gofmt support, as I found that ALE always worked better and gives a more consistent experience across filetypes. Also see my comments here.

When vim-go was started in 2014 (based on older work before that) a lot of the generic tools were non-existent or in their infancy. In the meanwhile these tools have matured significantly; what were the best choices in 2014 are not necessarily the best choices today.

gopher.vim is my idea of what "vim-go 2.0" could look like. I hope that a number of features will get merged back to vim-go, and it's possible this plugin may get retired eventually; or perhaps it will continue to exist alongside vim-go. We'll see.

It retains vim-go's commit history. While there have been large changes, it also retains many concepts and ideas. vim-go is the giant's shoulders on which gopher.vim stands.

Development

  • It's probably good idea to open an issue first for features or additions; I really don't like rejecting PRs but I like accruing "bloat" even less.

  • Please use .editorconfig style settings; vim-editorconfig is a good plugin to do this automatically.

  • The plugin is tested with testing.vim; running the full test suite should be as easy as tvim test ./... (tvim lint ./... for the style checkers).

  • Try to keep the public functions (gopher#foo#do_something()) as clean and usable as possible; use s:fun() for internal stuff, unless you want to test it in which case use Python's underscore style: gopher#python#_private_(). See API.markdown for some API docs (only public functions are documented in that file).

  • Prefer printf() over string concatenation; e.g. printf('x: %s', []) will work, whereas 'x: ' . [] will give you a useless error.

  • Use gopher#error() and gopher#info(); don't use echom or echoerr.

  • Prefix variables with the scope (e.g. l:var instead of var).

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