Fish Shell function that works with piped input or with argument based input -

I am trying to create a fish shell function that trim new lines from input and then input the clipboard Will copy.

How do I write this function so that it will happen;

• Process pipeline input (it works now)
• The function was pipe input
• In this case, immediately exit that a value argument Or pipe line, will now exit without any value in the tr pipeline

  Code:

   < Code> Function Copy - Copy 'trim new lines and clipboard' tr -d '\ n' | Pbcopy end    
   
   
   Updates that improve new lines:  
    Function Copy - Copy 'trim new lines and copy to clipboard' cat $ argv ^ / dev / null | While reading -l line set argv $ argv $ line end test- "$ argv"; And $ argv echo -n $ i finally return to me. Tr-d '\ n' | Pbcopy end   
   This was a great challenge, but with some small things it was possible. If you type  copy  without any arguments, it will wait your input indefinitely.  
   If you do not care about multi-line copy  | You can also remove  read  and then  copy  before tr-d '\ n' . Because readings by Newline end, then it will automatically accept up to the first new line, for example,  copy \ nme  will be copied only  copy .  
   code:  
    Copy the function - copy 'trim new lines and clipboard' cat $ argv ^ / dev / null | Tr-d '\ n' | Reading-L input set-ql input; Or set -l input $ argv if test -n "$ input" $ input echo. Tr-d '\ n' | Pbcopy End End   
   Example:  
    one ?? Goo copy \ nme | Copy the clipboard: copy â ?? Copy copy \ nyou clipboard: copyyou â ?? ¤ echo. Copy clipboard: copy one ?? ¤ Copy (Waiting indefinitely ...)