mirror of
https://github.com/imjasonh/dots
synced 2026-07-07 00:22:55 +00:00
31 lines
810 B
Go
31 lines
810 B
Go
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package dots
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import "fmt"
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// ParseHex parses a hex color string (with or without #) and returns the ANSI 256 color code.
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// Supports both 3-character shorthand (e.g., "f00") and 6-character full format (e.g., "ff0000").
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func ParseHex(hex string) (uint8, error) {
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// Remove # prefix if present
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if len(hex) > 0 && hex[0] == '#' {
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hex = hex[1:]
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}
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// Support both 3-char and 6-char hex
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if len(hex) == 3 {
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// Expand RGB to RRGGBB
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hex = string([]byte{hex[0], hex[0], hex[1], hex[1], hex[2], hex[2]})
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}
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if len(hex) != 6 {
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return 0, fmt.Errorf("invalid hex color length: %d (expected 3 or 6)", len(hex))
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}
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var r, g, b uint8
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_, err := fmt.Sscanf(hex, "%02x%02x%02x", &r, &g, &b)
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if err != nil {
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return 0, fmt.Errorf("invalid hex color format: %w", err)
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}
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return quantizeRGB(r, g, b), nil
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}
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