Accent color

[meisenzahl]

Goes with elementary/settings-daemon#25

[meisenzahl]

The accent color is now set as AccentColor. @cassidyjames do we want to possibly prefix that with io.elementary.?

[cassidyjames]

@meisenzahl I'm not super familiar with how XMP in EXIF works, but it sounds like it would be good to RDNN prefix it to avoid potential collisions?

[meisenzahl]

@cassidyjames Yes, exactly. Feel free to suggest what the attribute should be called.

[cassidyjames]

@meisenzahl io.elementary.AccentColor seems fine to me. Could we ensure we're matching this mapping, though? I think we're also generally moving to only use the cutesy food names in user strings and just use more standard color names anywhere for developers.

elementary/default-settings@17d737e

[meisenzahl]

@cassidyjames I'll take a look to see if we can ensure we're matching this mapping.

What do you think about a command line tool that makes sure that when you add a new image attributes like author and accent color are set?

I can refactor to use the following colors:

0 = No Preference (currently assumes Blue)
1 = Red
2 = Orange
3 = Yellow
4 = Green
5 = Mint
6 = Blue
7 = Purple
8 = Pink
9 = Brown
10 = Gray

[cassidyjames]

@meisenzahl I would be open to is as long as it's simple enough to use and maintain. :)

[meisenzahl]

@cassidyjames ready for review. I hope I have set all colors correctly now :)

[cassidyjames]

@meisenzahl okay I talked this through with Dan to make sure this was a good approach, and we agree EXIF seems like a good fit. But what's the need for the command-line app? It seems that we have to copy-paste some commands from the README either way, so this seems like it might be over-complicated compared to just using exiftool directly.

[meisenzahl]

@cassidyjames with the command line application you can set the EXIF information, but you can also lint the files. The cli tool also checks if the provided accent color is a valid value.

I was not able to use exif to extract the custom io.elementary.AccentColor metadata. Maybe that works too, but I am not sure...

[cassidyjames]

@meisenzahl gotcha. I think for now, let's split the command line tool off into its own branch so we can discuss/debate it there—but I'm fine with the inclusion of the EXIF data here.

[meisenzahl]

I have cleaned up the PR so far. However, I am not sure how to write the exiftool commands and create the configuration file. Using RDNN makes things a bit more complicated 😅️

@cassidyjames shall we discuss how to proceed with adding and verifying the metadata in #140?