init.m

(** User Mathematica initialization file **)

(** See https://reference.wolfram.com/language/tutorial/ConfigurationFiles.html for info on instaling this file **)

(** Display graphics inline in iTerm2. I don't know an easy way to test if we're running in iTerm2 without looking at the process table. **)

imgcat[image_Graphics]:=(
  WriteString[$Output, "\033]1337;File=inline=1:"<>ExportString[ExportString[image,"PNG"],"Base64"]<>"\007"];
  Null
)

(** `ListAnimate` seems to work but `Animate` doesn't. **)
imgcat[image_Manipulate]:=(
  WriteString[$Output, "\033]1337;File=inline=1:"<>ExportString[ExportString[image,"GIF"],"Base64"]<>"\007"];
  Null
)
imgcat[other_]:=other

$Post=imgcat

This allows Mathematica to inline images when Wolframscript is used from the iTerm2 terminal on macOS.