Hello!

I think the curl CLI is missing a feature to read form data from stdout of a process that's not connected to stdin of curl.

More precisely, you can give form data on the command line

  curl -F 'user=johndoe' ...
  
read it from a file

  curl -F 'data=<datafile' ...
  
or from stdin

  datasource | curl -F 'data=<-' ...

But what I want to do is to read the data from stdin, and ask for the passwd via ssh-askpass. As syntax I'd suggest the '=|' characters, in continuation of '=<' and '=@'. Example:

  datasource | curl -F 'data=<-' -F 'pass=|ssh-askpass' ...
                                         ^^
This command should put the output of the command 'datasource' into the 'data' field, and the output of the command 'ssh-askpass' into the 'pass' field. I think it can be done with the popen(3) system call from <stdio.h>.

What do you think?

Regards,
Stefan

-- 
Stefan Klinger                                      o/klettern
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