Function open_reader 

pub fn open_reader(path: &str) -> Result<Reader, Error>

Open a VCF/BCF file for reading.

Automatically detects and uses tabix (.tbi) or CSI (.csi) indices when available. If an index is found, region queries are enabled.

Example

use htsvcf_core::reader::open_reader;

let mut reader = open_reader("input.vcf.gz").unwrap();
while let Ok(Some(record)) = reader.next_record() {
    // process record
}