gocode

An autocompletion daemon for the Go programming language

Gocode is a helper tool which is intended to be integrated with your source code editor, like vim and emacs. It provides several advanced capabilities, which currently includes:

• Context-sensitive autocompletion

It is called daemon, because it uses client/server architecture for caching purposes. In particular, it makes autocompletions very fast. Typical autocompletion time with warm cache is 30ms, which is barely noticeable.

Also watch the demo screencast.

Setup

1. You should have a correctly installed Go compiler environment and your personal workspace ($GOPATH). If you have no idea what $GOPATH is, take a look here. Please make sure that your $GOPATH/bin is available in your $PATH. This is important, because most editors assume that gocode binary is available in one of the directories, specified by your $PATH environment variable. Otherwise manually copy the gocode binary from $GOPATH/bin to a location which is part of your $PATH after getting it in step 2.

   Do these steps only if you know why do you need them:

   export GOPATH=$HOME/goprojects

   export PATH=$PATH:$GOPATH/bin

2. Then you need to get the appropriate version of the gocode, for 6g/8g/5g compiler you can do this:

   go get -u github.com/nsf/gocode (-u flag for "update")

   Windows users should consider doing this instead:

   go get -u -ldflags -H=windowsgui github.com/nsf/gocode

   That way on the Windows OS gocode will be built as a GUI application and doing so solves hanging window issues with some of the editors.

3. Next steps are editor specific. See below.

Vim setup

In order to install vim scripts, you need to fulfill the following steps:

1. Install official Go vim scripts from $GOROOT/misc/vim. If you did that already, proceed to the step 2.

2. Install gocode vim scripts. Usually it's enough to do the following:

   vim/update.sh

   update.sh script does the following:

   #!/bin/sh
   mkdir -p "$HOME/.vim/autoload"
   mkdir -p "$HOME/.vim/ftplugin/go"
   cp "${0%/*}/autoload/gocomplete.vim" "$HOME/.vim/autoload"
   cp "${0%/*}/ftplugin/go/gocomplete.vim" "$HOME/.vim/ftplugin/go"
   

3. Make sure vim has filetype plugin enabled. Simply add that to your .vimrc:

   filetype plugin on

4. Autocompletion should work now. Use <C-x><C-o> for autocompletion (omnifunc autocompletion).

Alternatively take a look at the vundle/pathogen friendly repo: https://github.com/Blackrush/vim-gocode.

Emacs setup

In order to install emacs script, you need to fulfill the following steps:

1. Install auto-complete-mode

2. Copy emacs/go-autocomplete.el file from the gocode source distribution to a directory which is in your 'load-path' in emacs.

3. Add these lines to your .emacs:

   (require 'go-autocomplete)
   (require 'auto-complete-config)
   

Also, there is an alternative plugin for emacs using company-mode. See emacs-company/README for installation instructions.

Options

You can change all available options using gocode set command. The config file uses json format and is usually stored somewhere in ~/.config/gocode directory. On windows it's stored in the appropriate AppData folder. It's suggested to avoid modifying config file manually, do that using the gocode set command.

gocode set lists all options and their values.

gocode set <option> shows the value of that option.

gocode set <option> <value> sets the new value for that option.

• propose-builtins

  A boolean option. If true, gocode will add built-in types, functions and constants to an autocompletion proposals. Default: false.

• lib-path

  A string option. Allows you to add search paths for packages. By default, gocode only searches $GOPATH/pkg/$GOOS_$GOARCH and $GOROOT/pkg/$GOOS_$GOARCH in terms of previously existed environment variables. Also you can specify multiple paths using ':' (colon) as a separator (on Windows use semicolon ';').

Debugging

If something went wrong, the first thing you may want to do is manually start the gocode daemon in a separate terminal window. It will show you all the stack traces and panics if any. Shutdown the daemon if it was already started and run a new one explicitly:

gocode close

gocode -s

Please, report bugs, feature suggestions and other rants to the github issue tracker of this project.

Developing

If you want to integrate gocode in your editor, please, contact me and I will tell you exactly what do you need. You can send me a message via github or simply contact me via email.

Misc

• It's a good idea to use the latest git version always. I'm trying to keep it in a working state.