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[task #16073] --copykeys of Fits program takes keyword names also

From: Mohammad Akhlaghi
Subject: [task #16073] --copykeys of Fits program takes keyword names also
Date: Thu, 11 Nov 2021 18:31:11 -0500 (EST)
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:94.0) Gecko/20100101 Firefox/94.0


                 Summary: --copykeys of Fits program takes keyword names also
                 Project: GNU Astronomy Utilities
            Submitted by: makhlaghi
            Submitted on: Thu 11 Nov 2021 11:31:09 PM UTC
         Should Start On: Thu 11 Nov 2021 12:00:00 AM UTC
   Should be Finished on: Thu 11 Nov 2021 12:00:00 AM UTC
                Category: Fits
                Priority: 5 - Normal
              Item Group: Enhancement
                  Status: Postponed
                 Privacy: Public
        Percent Complete: 0%
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
                  Effort: 0.00



Currently the --copykeys option of Gnuastro's Fits program ('astfits') only
takes a range of keyword positions and copies the whole patch of keywords to
the output (see the description of this option in the book

However, in some scenarios, the position of the keywords may change in the
input, or the required keywords may not be contiguous in the header. So it
would be good for this option to accept keyword names also (as a
comma-separated list, or possibly called multiple times). For example

To distinguish between the two scenarios, we can simply see if the first value
can be parsed as a number or not. If so, the user intended a range, otherwise,
certain keyword names.

This task was suggested by Juan Antonio Fernández Ontiveros.


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