Create your own text control codes: Difference between revisions
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(Added Wren) |
(→{{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. |
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. |
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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. |
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. The effects supported are: color, bold, faint, italic, underline, wink, strike and overline each of which is represented by a method consisting of its initial letter. |
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When these methods complete, they restore the terminal attributes to what they were before. |
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''System.print'' can now interpolate these method calls. |
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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. |
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 |
// capitalize the initial letter for bright colors |
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static init_() { |
static init_() { |
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__cm = { "black": 30, "red" : 31, "green": 32, "yellow": 33, |
__cm = { "black": 30, "red" : 31, "green": 32, "yellow": 33, |
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"blue" : 34, "magenta": 35, "cyan" : 36, "white" : 37, |
"blue" : 34, "magenta": 35, "cyan" : 36, "white" : 37, |
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"Black": 90, "Red" : 91, "Green": 92, "Yellow": 93, |
"Black": 90, "Red" : 91, "Green": 92, "Yellow": 93, |
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} |
} |
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static c(fore, back, text) { |
static c(fore, back, text) { // colorize |
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if (!__cm) init_() |
if (!__cm) init_() |
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var fcn = __cm[fore] |
var fcn = __cm[fore] |
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} |
} |
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| ⚫ | |||
static b(text) { "\e[1m%(text)\e[22m" } // bold |
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static f(text) { "\e[2m%(text)\e[22m" } // faint |
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static i(text) { "\e[3m%(text)\e[23m" } // italic |
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| ⚫ | |||
static w(text) { "\e[5m%(text)\e[25m" } // wink (or blink) |
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static r(text) { "\e[7m%(text)\e[27m" } // reverse video |
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static s(text) { "\e[9m%(text)\e[29m" } // strike out |
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static o(text) { "\e[53m%(text)\e[55m" } // overline |
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} |
} |
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System.print("%(Sgr.c("red", "green", "This")) is |
System.print("%(Sgr.c("red", "green", "This")) is a color %(Sgr.c("yellow", "blue", "test")).") |
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System.print("\nOther effects:") |
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var effects = [ |
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Sgr.b("Bold"), Sgr.f("Faint"), Sgr.i("Italic"), Sgr.u("Underline"), |
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Sgr.w("Wink"), Sgr.r("Reverse"), Sgr.s("Strike"), Sgr.o("Overline") |
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] |
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System.print(effects.join(", "))</lang> |
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