[Github-comments] [geany/geany] [WIP] Add gocode support for autocomplete (#1457)

[gdm85]

I was looking for autocomplete support that would be aware of all relevant Go packages (in GOPATH, in project and vendor'd); I played a bit with ctags but couldn't get anything out of it.

So here I am proposing to add autocomplete support through [gocode](https://github.com/nsf/gocode) which is pretty much what other editors use (although I find gocode buggy itself, but that is another topic).

## General idea of this PR
* we would need an option to use gocode, either enabled or disabled by default; possibly gocode port too in case you're running multiple gocode daemons
* once this feature is enabled, the `autocomplete_scope` radically changes behavior and instead of using `tm_workspace_find_scope_members` it would rely on a gocode CLI call for each autocomplete resolution request (yes, pricey, but useful)
* the gocode CLI call receives the current buffer text via stdin and the results are parsed into `TMTag` structures
* once tags are generated the autocomplete feature is pretty much unchanged (I am thinking of adding something for calltips, but not sure yet)

By the way, nice work with the block folding feature, I just noticed by compiling master.

## Feedback request
Please notice this is a few ours work (kind of a POC), but I would like to have early feedback.

## Known issues of this PR
* the tag creation should be improved and possibly moved to tagmanager (please advise on that)
* the feature should be configurable and better packaged
* not much used to C/GTK, so I don't even know how many leaks I am introducing here (possibly need to check with proper debug options or valgrind)
* will adjust to proper coding style (yes I noticed the style you are using)

It works already (in this shaky version), see screenshot:
![screen_geany1](https://cloud.githubusercontent.com/assets/7117866/24683195/e62fe3ac-199d-11e7-8422-4221aaf55c00.png)

You can view, comment on, or merge this pull request online at:

  https://github.com/geany/geany/pull/1457

-- Commit Summary --

  * Preliminary work to add gocode support for autocomplete

-- File Changes --

    M src/editor.c (242)

-- Patch Links --

https://github.com/geany/geany/pull/1457.patch
https://github.com/geany/geany/pull/1457.diff

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