Ansi color battery improvements (#257)

* Rename to richterm, play on words with rich text and isn't vague
* Reduce the size of the created closures via doing all of the
formatting within a `format` function
* Use `table.concat` instead of repeadedly using the concat operator
(`table.concat` is faster)
* Remove dependency on lutes process lib, and added a nocolor arg to
every formatter that replicates this behavior. As its stated in the
README that batteries aren't supposed to depend on lute.
* Rename bright formatters to be gramatically correct ie `redBright` is
now `brightRed`

If the process lib is ever moved to the @std alias (it might already be
under there idk), I'd expect there to be a pcall require situation to be
added so that if the env variable for no color is set richterm respects
it.

Author: gaymeowing

batteries/colorful.luau

@@ -0,0 +1,100 @@
+--[[
+	richterm
+	terminal ansi formatter
+]]
+
+export type Formatter = (s: string, nocolor: boolean?) -> string
+
+-- @noinline (if it ever exists)
+local function format(s: string, open: string, close: string, replace: string): string
+	local index = string.find(s, close, #open + 1, true)
+	local middle = s
+
+	if index then
+		local closeLen = #close
+		local middleTbl = {}
+		local cursor = 1
+
+		while index do
+			table.insert(middleTbl, string.sub(s, cursor, index - 1))
+			cursor = index + closeLen
+			index = string.find(s, close, cursor, true)
+		end
+
+		middle = table.concat(middleTbl, replace)
+	end
+
+	return open .. middle .. close
+end
+
+local function formatter(open: string, close: string, replace: string?): Formatter
+	replace = replace or open
+
+	return function(s, nocolor)
+		return if nocolor then s else format(s, open, close, replace :: string)
+	end
+end
+
+local richterm = {
+	reset = formatter("\x1b[0m", "\x1b[0m"),
+	bold = formatter("\x1b[1m", "\x1b[22m", "\x1b[22m\x1b[1m"),
+	dim = formatter("\x1b[2m", "\x1b[22m", "\x1b[22m\x1b[2m"),
+	italic = formatter("\x1b[3m", "\x1b[23m"),
+	underline = formatter("\x1b[4m", "\x1b[24m"),
+	inverse = formatter("\x1b[7m", "\x1b[27m"),
+	hidden = formatter("\x1b[8m", "\x1b[28m"),
+	strikethrough = formatter("\x1b[9m", "\x1b[29m"),
+
+	black = formatter("\x1b[30m", "\x1b[39m"),
+	red = formatter("\x1b[31m", "\x1b[39m"),
+	green = formatter("\x1b[32m", "\x1b[39m"),
+	yellow = formatter("\x1b[33m", "\x1b[39m"),
+	blue = formatter("\x1b[34m", "\x1b[39m"),
+	magenta = formatter("\x1b[35m", "\x1b[39m"),
+	cyan = formatter("\x1b[36m", "\x1b[39m"),
+	white = formatter("\x1b[37m", "\x1b[39m"),
+	gray = formatter("\x1b[90m", "\x1b[39m"),
+
+	bgBlack = formatter("\x1b[40m", "\x1b[49m"),
+	bgRed = formatter("\x1b[41m", "\x1b[49m"),
+	bgGreen = formatter("\x1b[42m", "\x1b[49m"),
+	bgYellow = formatter("\x1b[43m", "\x1b[49m"),
+	bgBlue = formatter("\x1b[44m", "\x1b[49m"),
+	bgMagenta = formatter("\x1b[45m", "\x1b[49m"),
+	bgCyan = formatter("\x1b[46m", "\x1b[49m"),
+	bgWhite = formatter("\x1b[47m", "\x1b[49m"),
+
+	brightBlack = formatter("\x1b[90m", "\x1b[39m"),
+	brightRed = formatter("\x1b[91m", "\x1b[39m"),
+	brightGreen = formatter("\x1b[92m", "\x1b[39m"),
+	brightYellow = formatter("\x1b[93m", "\x1b[39m"),
+	brightBlue = formatter("\x1b[94m", "\x1b[39m"),
+	brightMagenta = formatter("\x1b[95m", "\x1b[39m"),
+	brightCyan = formatter("\x1b[96m", "\x1b[39m"),
+	brightWhite = formatter("\x1b[97m", "\x1b[39m"),
+
+	bgBrightBlack = formatter("\x1b[100m", "\x1b[49m"),
+	bgBrightRed = formatter("\x1b[101m", "\x1b[49m"),
+	bgBrightGreen = formatter("\x1b[102m", "\x1b[49m"),
+	bgBrightYellow = formatter("\x1b[103m", "\x1b[49m"),
+	bgBrightBlue = formatter("\x1b[104m", "\x1b[49m"),
+	bgBrightMagenta = formatter("\x1b[105m", "\x1b[49m"),
+	bgBrightCyan = formatter("\x1b[106m", "\x1b[49m"),
+	bgBrightWhite = formatter("\x1b[107m", "\x1b[49m"),
+}
+
+function richterm.combine(...: Formatter): Formatter
+	local formatters = { ... }
+
+	return function(s, nocolor)
+		if not nocolor then
+			for _, formatter in formatters do
+				s = formatter(s)
+			end
+		end
+
+		return s
+	end
+end
+
+return table.freeze(richterm)