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Extract date range from gzip file metadata

Source: R/utils.R
extract_date_range.Rd

Reads the gzip file header to extract the original filename, then parses the date range from the filename (expected format: YYYYMMDD).

Usage

extract_date_range(path)

Arguments

path

Character. Path(s) to gzip file(s).

Value

Character. Date range in format "YYYY-MM-DD to YYYY-MM-DD" or character vector if multiple paths provided.

References

  • https://www.rfc-editor.org/rfc/rfc1952.html#page-5

  • https://en.wikipedia.org/wiki/Gzip#File_structure

Examples

if (FALSE) { # interactive()
extract_date_range(cache_path("this_yr"))
extract_date_range(cache_path("yr_2_5"))
extract_date_range(cache_path("yr_5_10"))
extract_date_range(cache_path("historic"))

extract_date_range(cache_path(c("this_yr", "historic")))
}