Chat command processing in ><>

chat.fish

001.   >    >~" "  >$2p ~ 0&703.
 :i:0(?^:a=?^:" "=?^$2p1+

 :&:&$g&:&2g:" "=?v=?!v&1+&       >
        ;Dv? =";"~<   >1+&~0&:c)?v^       ;<                          v o<
          >&$.;                  >02g"@"=?!^0["` dnammoc dezingocernu">l?^1v
        v o;?<                ^ number of commands         ;o"`"v!?=" ":g2:<
@type;  >i:0(^            v o<     v      <                     >   o:1+   ^
@bye;   "!eyb"oooo;      r>l?^;2[0[>i:0(?!^~:a=?~r]r$.;
@what;  "this is a command chat interface written in ><>."c2*8.
@help;  "available commands: "rv o<              v           +1  <
@eval;  "nope."c2*8.;          >l?^7>:0$g"@"=?!;0>}:{:@$g:o";"=?v^;
@rev;   eca3*8.rc2*8.               ^                    +1~o" "<

made by Conor O'Brien, October 16th, 2016. You may use and modify this, but
you must also give me credit for it.

guide for running:
run as:

    echo <message>|chat.fish

e.g.:

    echo @help|chat.fish

guide to macros:
`c2*8.` prints the stack as a string and terminates the program.
`a3*8.` assumes that coordinates (x, y) are on the top of the stack, and puts the rest of the input in a new stack.