Want to handle color more flexibly for individual cells in HTML

[gdamore]

I have tables where the color of a single cell is based on a status (e.g. "UP" is green, and "DOWN" is red). (I'm using color.Sprint() generally for this, or sometimes color.Sprintf.)

Unfortunately the HTML colorizer doesn't understand this, and just puts the ANSI escapes right into the HTML.

Further, I don't see a mechanism like color.Sprint() ... it would be workable if I could do color.SprintHTML() or something that would emit a . ... but setting the class on the TD or TH element works well too. Provided that I can have per-cell tunability of this.

[gdamore]

I have solved this on my end by using a substitution that looks for the escape sequences in the HTML and rewrites them into spans. Its a little hacky because it won't deal well with multiple color settings in the same span (e.g. bold and red together), but it works ok for my use case.

[gdamore]

Here's my implementation, feel free to use as you like. I have a special stand in "brand color" that is tunable for branding. You probably don't want that. :-)

// HtmlColorize takes a string that contains ANSI escape sequences and converts them to HTML span elements suitably styled.
// At present it does not handle mixing of colors or styles.
func HtmlColorize(s string) string {
	var colors = []Color{
		Red,
		Green,
		Yellow,
		Magenta,
		Black,
		Grey,
		White,
		Blue,
		Cyan,
		BrightRed,

		BgBlack,
		BgGrey,
		BgWhite,
		BgMagenta,
		BgRed,
		BgGreen,

		Underline,
		Dim,
		Bold,
	}

	for _, c := range colors {
		s = strings.ReplaceAll(s, c.EscapeSeq(), fmt.Sprintf("<span %s>", c.HTMLProperty()))
	}
	s = strings.ReplaceAll(s, Brand.EscapeSeq(), `<span class="brand">`)
	s = strings.ReplaceAll(s, NoColor.EscapeSeq(), "</span>")
	return s
}