pub fn normalize_sam_whitespace(text: &str) -> (Cow<'_, str>, bool)Expand description
Normalize SAM header lines that use spaces instead of tabs.
Browsers and copy-paste often convert tabs to spaces. This function detects
SAM header lines (@XX prefix) where fields are space-separated instead of
tab-separated and converts the spaces to tabs.
Only normalizes lines that start with a SAM header record type (@HD, @SQ,
@RG, @PG) followed by a space and a TAG: pattern. Lines that already
contain tabs are left unchanged. @CO (comment) lines are not normalized
because their content is free-form text where spaces are meaningful.
Returns the (possibly normalized) text and a boolean indicating whether any
normalization was performed. Uses Cow to avoid allocation when no
normalization is needed (the common case for well-formed input).