Function commonIndent

internal/lint/code/query.go:93–108

commonIndent returns the length, in bytes, of the longest run of leading `cutset` characters shared by every non-blank line. Blank lines (those that are empty after trimming) are ignored so they don't force the indent to zero.

(lines []string, cutset string)

// `cutset` characters shared by every non-blank line. Blank lines (those that
// are empty after trimming) are ignored so they don't force the indent to zero.
func commonIndent(lines []string, cutset string) int {
	common := -1
	for _, line := range lines {
		if strings.TrimLeft(line, cutset) == "" {
			continue
		}
		n := len(line) - len(strings.TrimLeft(line, cutset))
		if common == -1 || n < common {
			common = n
		}
	}
	if common < 0 {
		return 0
	}
	return common
}

// stripIndent removes up to `n` leading `cutset` characters from `line` (a line
// with fewer than `n` leading cutset characters -- e.g. a blank line -- loses