[gnuastro-devel] [task #14691] cosmiccal: handle stdin and act as a filter to stdout

[Boud Roukema]

URL:
  <http://savannah.gnu.org/task/?14691>

                 Summary: cosmiccal: handle stdin and act as a filter to
stdout
                 Project: GNU Astronomy Utilities
            Submitted by: boud
            Submitted on: Tue 03 Oct 2017 03:15:44 PM UTC
         Should Start On: Tue 03 Oct 2017 12:00:00 AM UTC
   Should be Finished on: Tue 03 Oct 2017 12:00:00 AM UTC
                Category: CosmicCalculator
                Priority: 5 - Normal
              Item Group: New feature
                  Status: None
                 Privacy: Public
        Percent Complete: 0%
             Assigned to: boud
             Open/Closed: Open
         Discussion Lock: Any
                  Effort: 0.00

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Details:

It would be good if cosmiccal can read a list of redshifts
or times from standard input _stdin_ and output the (single)
chosen parameter (or possibly: multiple space-separated parameters) to
standard output _stdout_. A simple way to do 
this is to read from stdin until EOF as in cosmdist:

https://bitbucket.org/broukema/cosmdist/src/deeeef1a681257a5ef42412eaec0928e61425b68/cosmdist.c?at=master&fileviewer=file-view-default

Ways to modify cosmiccal include:

* if neither redshift or time are entered, then read and filter stdin
* add a single minus "-" option as a parameter to override default input
redshift or time

More ambitious methods include communicating directly between 
the processes before and after the pipe.





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