Function applyRunLengthEncoding

src/integrations/misc/extract-text.ts:310–362

(content: string)

 * @returns The compressed text with run-length encoding applied
 */
export function applyRunLengthEncoding(content: string): string {
	if (!content) {
		return content
	}

	let result = ""
	let pos = 0
	let repeatCount = 0
	let prevLine = null

	while (pos < content.length) {
		const nextNewlineIdx = content.indexOf("\n", pos) // Find next line feed (\n) index
		const currentLine = nextNewlineIdx === -1 ? content.slice(pos) : content.slice(pos, nextNewlineIdx + 1)

		if (prevLine === null) {
			prevLine = currentLine
		} else if (currentLine === prevLine) {
			repeatCount++
		} else {
			if (repeatCount > 0) {
				const compressionDesc = `<previous line repeated ${repeatCount} additional times>\n`
				if (compressionDesc.length < prevLine.length * (repeatCount + 1)) {
					result += prevLine + compressionDesc
				} else {
					for (let i = 0; i <= repeatCount; i++) {
						result += prevLine
					}
				}
				repeatCount = 0
			} else {
				result += prevLine
			}
			prevLine = currentLine
		}

		pos = nextNewlineIdx === -1 ? content.length : nextNewlineIdx + 1
	}

	if (repeatCount > 0 && prevLine !== null) {
		const compressionDesc = `<previous line repeated ${repeatCount} additional times>\n`
		if (compressionDesc.length < prevLine.length * repeatCount) {
			result += prevLine + compressionDesc
		} else {
			for (let i = 0; i <= repeatCount; i++) {
				result += prevLine
			}
		}
	} else if (prevLine !== null) {
		result += prevLine
	}

	return result
}

/**
 * Processes carriage returns (\r) in terminal output to simulate how a real terminal would display content.