Add samtools head -e EXPR header filtering option [DRAFT]
#1537
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Prints the input file's headers and optionally also its first few alignment records. This command always displays the headers as they are in the file, never adding an extra `@PG` header itself.
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A draft PR on top of #1517 that adds a
-e, --expr EXPRoption to thesamtools headcommand, to allow arbitrary filtering of which headers to display.Requires PR samtools/htslib#1351, and adds draft documentation of that PR's proposed header filter variables to doc/samtools.1.
This enables useful functionality such as: