WIP: add TerminalGraphicDisplay for image/png

[johnnychen94]

closes #48

without sixel:

[johnnychen94]

This might not be ideal because if there're other GUI image viewers, we'd better use them. Currently, it seems that vscode is smart enough to figure the order out, I'll need to check other GUIs to see if it's also the same case.

julia> typeof.(Base.Multimedia.displays)
4-element Vector{DataType}:
 TextDisplay
 REPL.REPLDisplay{REPL.LineEditREPL}
 ImageInTerminal.TerminalGraphicDisplay{Base.TTY, Base.TTY}
 VSCodeServer.InlineDisplay

[johnnychen94]

With sixel:

Except for the latex compilation overhead which we cannot workaround in trivial ways, the result looks good to me.

[t-bltg]

Create self contained examples for copy/paste:

without sixel

using ImageInTerminal, Latexify

main() = latexify(:(x/y)) |> s -> render(s, MIME("image/png"))

main()

with sixel ¹

using Sixel, ImageInTerminal, Latexify

main() = @latexify([2+3i ∞; π x/(1/x + (y+x)^2)]) |> s -> render(s, MIME("image/png"))

main()

Footnotes

1. for sixel support, code snippet must be ran under a compatible terminal. ↩

[t-bltg]

@johnnychen94, what's left to do for this PR to get merged ?

[johnnychen94]

For the bigger picture of this package, I've commented in JuliaPlots/UnicodePlots.jl#196 (comment). For this PR I think it's mainly a functionality check and unit tests; I wasn't sure how this PR would affect the normal usage of vscode+julia, Atom+julia, and Jupyter+julia.

[t-bltg]

It'd be great if we could merge this one, and add an option to remove the summary (not needed for equations).

[johnnychen94]

@t-bltg I think I might never have the time to really dive into this package in the near future, so feel free to do anything you like to ImageInTerminal and related.

[t-bltg]

Thanks @johnnychen94, I might no be the best qualified to enhance ImageInTerminal, but is better to move forward and fix things that have stale PRs everywhere. So for this PR, if plan to :

1. drop FileIO < 1.6
2. disable summary by default by using TerminalGraphicDisplay(stdout, devnull) on __init__

Are you ok with these (and pushing in your branch ?)

After merging this one, I'll rework and merge #58.

[johnnychen94]

Yes of course. You have made great progress to UnicodePlots -- a fantastical work. I believe if you put some effort into ImageInTerminal, this package will revive as well.

[t-bltg]

Thanks ! I'll try my best ...
If you have comments or see that I'm destroying stuff don't hesitate to hit me :)