?foo and ??foo for :help foo / :help find foo in the REPL

[johnkerl]

I use :help and :help find a lot; :h and :h find are shorter, but they can be shorter than that. Also, this is reminiscent of R's on-line help.

$ mlr repl
Miller 6.0.0-dev REPL for darwin/amd64/go1.16.5
Docs: https://miller.readthedocs.io
Type ':h' or ':help' for online help; ':q' or ':quit' to quit.

[mlr] ?joink
joink  (class=conversion #args=2) Makes string from map/array keys.
Examples:
joink({"a":3,"b":4,"c":5}, ",") = "a,b,c".
joink([1,2,3], ",") = "1,2,3".

[mlr] ??joink
joink  (class=conversion #args=2) Makes string from map/array keys.
Examples:
joink({"a":3,"b":4,"c":5}, ",") = "a,b,c".
joink([1,2,3], ",") = "1,2,3".
joinkv  (class=conversion #args=3) Makes string from map/array key-value pairs.
Examples:
joinkv([3,4,5], "=", ",") = "1=3,2=4,3=5"
joinkv({"a":3,"b":4,"c":5}, "=", ",") = "a=3,b=4,c=5"

[mlr]