Go back to README.
Go back to syntax highlighting.
Open the settings: Ctrl + Alt + S or File -> Settings
In the settings,go to Editor -> File types.
Add a new "Recognized File Type" and add *.st under "File name patterns".
Double click your file type in the list and configure the page as follows:
clear
collect
drop
dump
dup
exit
expand
import
in
index
len
out
outln
pull
push
rem
sqrt
stacklen
sth
swap
trace
int
inch
break
continue
delete
do
else
end
func
global
if
return
store
update
while
true
false
!
%
&
\*
\**
\+
\-
/
<
<<
<=
=
>
>=
>>
@
^
|
~
