Create your own text control codes: Difference between revisions
→{{header|Wren}}: Added more effects.
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(→{{header|Wren}}: Added more effects.) |
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When doing RC tasks, I often use methods in my own ''Wren-fmt'' module which does most of what C's ''printf'' statement does and other things besides. Although I could add anything I like to that, it's already more than 800 lines long and so I don't think it would be appropriate to patch it for the purposes of this task.
What I've done instead is to create a special class called ''Sgr'' (Select graphic rendition) which adds special effects when printing text to terminals which support ANSI escape sequences.
When these methods complete, they restore the terminal attributes to what they were before.
''System.print'' can now interpolate these method calls.
Although it would be possible to abbreviate the color arguments passed to ''Sgr.c'', I haven't done so because I didn't think it would be very user friendly.
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// capitalize the initial letter for bright colors
static init_() {
__cm = { "black": 30, "red" : 31, "green": 32, "yellow": 33,
"blue" : 34, "magenta": 35, "cyan" : 36, "white" : 37,
"Black": 90, "Red" : 91, "Green": 92, "Yellow": 93,
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}
static c(fore, back, text) { // colorize
if (!__cm) init_()
var fcn = __cm[fore]
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}
static u(text) { "\e[4m%(text)\e[24m" }▼
static b(text) { "\e[1m%(text)\e[22m" } // bold
static f(text) { "\e[2m%(text)\e[22m" } // faint
static i(text) { "\e[3m%(text)\e[23m" } // italic
▲ static u(text) { "\e[4m%(text)\e[24m" } // underline
static w(text) { "\e[5m%(text)\e[25m" } // wink (or blink)
static r(text) { "\e[7m%(text)\e[27m" } // reverse video
static s(text) { "\e[9m%(text)\e[29m" } // strike out
static o(text) { "\e[53m%(text)\e[55m" } // overline
}
System.print("%(Sgr.c("red", "green", "This")) is
System.print("\nOther effects:")
var effects = [
Sgr.b("Bold"), Sgr.f("Faint"), Sgr.i("Italic"), Sgr.u("Underline"),
Sgr.w("Wink"), Sgr.r("Reverse"), Sgr.s("Strike"), Sgr.o("Overline")
]
System.print(effects.join(", "))</lang>
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