Colors

Okay, so far so good. We can use macros like @red and the tprint function to print colored strings. But so far we've only been using few named colors, but..

there's a whole rainbow
 of colors out there

so how can we use different kinds of colors? It's all done through Term's markup syntax of course. Look:

tprint("[(255, 50, 100)]colors![/(255, 50, 100)]")
colors!

yep, you can pass a set of (r, g, b) values and that'll do it. Personally, I prefer working with hex codes, and so Term can accept them too:

indigo = "#42A5F5"

tprint("Some [$indigo]color![/$indigo]")
Some color!

Under the hood

What Term is doing here is taking each bit of style information in the markup tag (each word or each (...) within [...]) and constructing style codes with an ANSICode object.

If the style informaton represents a color, Term first represents it as a AbstractColor type: NamedColor or BitColor or RGBColor.

NamedColor objects represent simple colors like red and blue, BitColor represent 16-bit colors like dark_goldenrod and RGBColor, surprisingly, represents rgb-style colors. There's no method to represent hex colors as these are converted into rgb first.

The distinction between NamedColor, BitColor and RGBColor is necessary because the three color styles are represented by a different syntax in the ANSI codes. Naturally, Term users won't normally worry about this and can use whichever color formulation is most convenient.

Colors

Below all named colors, 16bit colors and (many) RGB colors are printed for display.

import Term: CODES_16BIT_COLORS
import Term: Panel

function make_named_colors()
    sort_idx = sortperm(collect(values(CODES_16BIT_COLORS)))
    cnames = collect(keys(CODES_16BIT_COLORS))[sort_idx][1:9]
    colors = ""
    colors = join(map(
        (c)->"[on_$c] [/on_$c]", cnames
    ))
    return colors
end

function make_16bit_colors()
    sort_idx = sortperm(collect(values(CODES_16BIT_COLORS)))
    cnames = collect(keys(CODES_16BIT_COLORS))[sort_idx][9:end]
    colors = ""
    colors = join(map(
        (c)->"[on_$c] [/on_$c]", cnames
    ))
    return colors
end

function make_rgb_colors()
    values = 1:25:255
    colors = ""
    for r in values, b in values, g in values[1:end-1]
        colors *= "[on_($r, $g, $b)] [/on_($r, $g, $b)]"
    end
    return colors
end



print(
    Panel(make_named_colors(), width=20, justify=:center, title="Named  colors", style="bold yellow") / # stacking operator, see layout page
    Panel(make_16bit_colors(), width=42, title="16 bit colors", style="bold yellow") /
    Panel(make_rgb_colors(), width=88, title="RGB colors", style="bold yellow")
)
╭─ Named  colors ──╮
                  
╰──────────────────╯
╭─ 16 bit colors ────────────────────────╮
                                        
                                        
                                        
                                        
                                        
                                        
╰────────────────────────────────────────╯
╭─ RGB colors ─────────────────────────────────────────────────────────────────────────╮
                                                                                      
                                                                                      
                                                                                      
                                                                                      
                                                                                      
                                                                                      
                                                                                      
                                                                                      
                                                                                      
                                                                                      
                                                                                      
                                                                                      
                                                                                      
                                                                                      
                                                                                      
╰──────────────────────────────────────────────────────────────────────────────────────╯