Add git stash segment

[apinkney97]

Up-to-date rework of #201, addressing issue #114.

This also refactors some common functions from the version control segments into utils.py.

[b-ryan]

Thanks for updating this. The diff shows a lot of changes - I'm not sure why. Perhaps you have to merge the latest master?

[apinkney97]

I think it is from the latest master (it's from ae33f7e at least).

This is broken into two commits:

• fc62b0f touches a lot of files since it refactors out a lot of duplicated functions into utils.py
• 709c5ba is the commit that adds the git stash segment, and uses the refactored functions

[uloco]

Still waiting for this like crazy... 😞

[apinkney97]

@b-ryan if you prefer I can rework this without fc62b0f (ie leave all the duplicated get_PATH and x_subprocess_env functions and either copy those functions from segments.git or import them) but my preference would be to leave it as it currently stands.

[b-ryan]

Sorry things have been crazy. Looking at this now.

[b-ryan]

Code looks good. The only thing that gives me pause is the symbol used for the segment. Unicode symbols... Not all fonts have support for them. It would be useful to know whether the https://github.com/powerline/fonts fonts support this symbol.

In any case, the symbol should be added to https://github.com/b-ryan/powerline-shell/blob/master/powerline_shell/utils.py#L17 rather than be a constant so that the symbol is configurable.

[apinkney97]

Anecdotally it seems to render ok on my terminal in all fonts I've tried (10 or so different ones, powerline, non-powerline monospace, and proportional fonts). Possibly my terminal is being clever and pulling it from some font that does contain that glyph.

Seems to work even for totally crazy fonts that you'd never use in a terminal that don't support powerline:

Not quite sure whether I've done this right (I haven't really poked around inside fonts before) but I think this should list which fonts support a given unicode character:

$ for i in $(find /usr/share/fonts /usr/local/share/fonts -name "*.ttf"); do showttf $i 2>/dev/null | grep -i 'U+2398' && echo $i; done | grep "\.ttf" 
/usr/share/fonts/truetype/ancient-scripts/Symbola_hint.ttf                              
/usr/share/fonts/truetype/freefont/FreeSerif.ttf                                        
/usr/share/fonts/truetype/freefont/FreeMono.ttf                                         

Admittedly it's not many (3 .ttf files out of 177) but I think those all shipped with the OS (Ubuntu 16.04).

Again, this is pretty anecdotal, but it seemed to work ok for people who commented on the old PR: #201 (comment)

[b-ryan]

Nice - thanks for looking into the fonts & making that change.

[uloco]

🎉 🎉 🎉 🎉
Thank you guys :)))