fix :GoBuild issues in neovim

[joshuarubin]

1. honor g:go_echo_command_info when dispatching builds in neovim
2. fix :GoBuild error in neovim due to invalid jobcontrol handler function signatures (s:on_stdout, s:on_stderr)
3. update statusline before and after go#jobcontrol#Spawn command is executed

also, as an aside, it looks like vim's job capability is utilized much more than neovim's job-control. it would be nice to abstract the differences and bring neovim up to parity again.

[joshuarubin]

btw, (2) was caused by #1145
it removed the 3rd arg from the callback. here is the place that states that 3 args are required. my patch keeps the dict option though.
neovim/neovim#5763 (comment)

[joshuarubin]

Any chance this can get merged?

[andviro]

Haha, missed this one. Did a similar job in #1183

[joshuarubin]

Any update on this?

[fatih]

@joshuarubin thanks for the PR. Sorry for my late response. I'm busy lately and was sick as well. I also went abroad to give a talk and thus didn't had any time to look at my open source projects. I'll check it out the following days, if not next week. For now please use it locally. Thanks.

[fatih]

Thanks @joshuarubin this looks good.

also, as an aside, it looks like vim's job capability is utilized much more than neovim's job-control. it would be nice to abstract the differences and bring neovim up to parity again.

Agree, the reason is that Vim is supported more than Neovim right now. I'm open to improvements though for both platforms, unless they require complex changes. Eventually going forward, even if it takes some time, they both will have some feature parity.