error handling when index needed but input stdin

ComparativeGenomicsToolkit / taffy

This is a library C/Python/CLI for working with TAF (.taf,.taf.gz) and MAF (.maf) alignment files

MIT License

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Closed glennhickey closed 3 months ago

glennhickey commented 3 months ago

taffy view -r needs an indexed input file to work. but if the input is stdin, it just crashes when trying to determine the index filename (#62).

This PR changes the crash into an error message (ditto taffy coverage -s).