range should accept negative indexes

[rossjones]

THe range in delete current accepts a comma-separated list, but doesn't work with negative indexes. This would be really handy for clearing junk at the end of a file, see:

http://static.london.gov.uk/gla/expenditure/docs/2012-13-P12-250.csv

Would expect the following URL to remove the first 5 lines, and the last 4 lines of the CSV.

http://datapipes.okfnlabs.org/csv/delete?range=0:6,-4:&url=http://static.london.gov.uk/gla/expenditure/docs/2012-13-P12-250.csv&

[andylolz]

Good plan.

Referencing from the end of the file is a very similar problem to tail, and can also be solved using fixed queues.

There’s actually an extra, very nice feature request in the second example i.e. implied 'first' or 'last' row/column by omitting one of the range limits.