Function executeIndent

src/vim/operators.ts:348–392

(
  dir: '>' | '<',
  count: number,
  ctx: OperatorContext,
)

 * Execute indent (>> command).
 */
export function executeIndent(
  dir: '>' | '<',
  count: number,
  ctx: OperatorContext,
): void {
  const text = ctx.text
  const lines = text.split('\n')
  const { line: currentLine } = ctx.cursor.getPosition()
  const linesToAffect = Math.min(count, lines.length - currentLine)
  const indent = '  ' // Two spaces

  for (let i = 0; i < linesToAffect; i++) {
    const lineIdx = currentLine + i
    const line = lines[lineIdx] ?? ''

    if (dir === '>') {
      lines[lineIdx] = indent + line
    } else if (line.startsWith(indent)) {
      lines[lineIdx] = line.slice(indent.length)
    } else if (line.startsWith('\t')) {
      lines[lineIdx] = line.slice(1)
    } else {
      // Remove as much leading whitespace as possible up to indent length
      let removed = 0
      let idx = 0
      while (
        idx < line.length &&
        removed < indent.length &&
        /\s/.test(line[idx]!)
      ) {
        removed++
        idx++
      }
      lines[lineIdx] = line.slice(idx)
    }
  }

  const newText = lines.join('\n')
  const currentLineText = lines[currentLine] ?? ''
  const firstNonBlank = (currentLineText.match(/^\s*/)?.[0] ?? '').length

  ctx.setText(newText)
  ctx.setOffset(getLineStartOffset(lines, currentLine) + firstNonBlank)
  ctx.recordChange({ type: 'indent', dir, count })
}

/**
 * Execute open line (o/O command).