add ncm2 source support

[fcying]

for ncm2 https://github.com/ncm2/ncm2 #61

[jsfaint]

I tested this PR, it works for me 👍
But there are several minor things:

1. Please rename the file ncm2_gen_tags as ncm2_gtags, because this is only gtags completion.
2. Please remove trailing space in ncm2_gen_tags.py line 30

Thanks for your contribution!

BTW: Should we remove ncm source now? or just keep it for compatible.

[fcying]

I think it can be remove now.....

The maintainer said:

PLEASE USE https://github.com/ncm2/ncm2 INSTEAD

[jsfaint]

OK, please remove it with a new commit.
I'll modify the document later when I get some time.

A little question why do you add cwd=data['cwd'] for subprocess.Popen()?
I removed this line, the source still works.
Just curious, because I'm not familiar with python 😄

[fcying]

It will changes the global working dir to cwd before subprocess executing the child, may be it will effect the relative position for some files?
I just saw it add in deoplete source, so I add it too@_@

[jsfaint]

gtags/global checks the database via environment variable GTAGSDBPATH, but not in the current working directory
So maybe we can remove it?

[fcying]

Ok, I remove it both ncm2 and deoplete source.

[jsfaint]

Merged, thanks for your contribution~

[butterflyfish]

if possible, please help add function parameter expansion support. appreciated.

[jsfaint]

gtags is tag based only, it is impossible to add parameter expansion support...

[butterflyfish]

GNU global provide function prototype, that's why I think it's impossible. Like ncm2/ncm2-pyclang provide parameter expansion.

example:

global -x new_terminal
new_terminal      113 src/terminal.c   new_terminal(tea_t* tea, char* name, int ifd, int ofd, aio_recv_t aio_recv)

[jsfaint]

Yes, but it is not for completion. I have no idea how to implement it.
The PR is appreciated.

[butterflyfish]

I'm not python programmer, no idea also. Welcome someone implement this fantastic feature.