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feat(banner): randomize character set between Katakana, Cyrillic, and Greek on each run #177

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feat(banner): randomize character set between Katakana, Cyrillic, and Greek on each run #177

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16 changes: 13 additions & 3 deletions internal/banner/banner.go
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Original file line number Diff line number Diff line change
Expand Up @@ -52,8 +52,15 @@ var quotesList = []Quote{
{Text: "Information wants to be free.", Author: "Stewart Brand"},
}

// Character set matching JS RETICLE_CHARS — 20 katakana + 16 hex digits.
var matrixChars = []rune("アイウエオカキクケコサシスセソタチツテト0123456789ABCDEF")
// charSets contains alternate character sets for the reticle animation.
// One is chosen at random each run.
var charSets = [][]rune{
[]rune("アイウエオカキクケコサシスセソタチツテト0123456789ABCDEF"), // Katakana
[]rune("АБВГДЕЖЗИКЛМНОПРСТУФ0123456789ABCDEF"), // Cyrillic
[]rune("ΑΒΓΔΕΖΗΘΙΚΛΜΝΞΟΠΡΣΤΥ0123456789ABCDEF"), // Greek
}

var matrixChars []rune

const (
reticleWidth = 80
Expand Down Expand Up @@ -89,11 +96,14 @@ type reticleChar struct {
var reticleChars []reticleChar

func init() {
matrixChars = charSets[mathrand.Intn(len(charSets))] // #nosec G404 -- decorative
reticleChars = generateReticle()
}

func isWide(r rune) bool {
return r >= 0x30A0 && r <= 0x30FF
return (r >= 0x30A0 && r <= 0x30FF) || // Katakana
(r >= 0x4E00 && r <= 0x9FFF) || // CJK
(r >= 0xAC00 && r <= 0xD7AF) // Hangul
}

func visibleWidth(s string) int {
Expand Down