Update: This macro is now built into Twine 1.4! It is no longer necessary to install it.

This is not strictly a new macro, but a replacement version of the <<if>> macro. You might have noticed that nesting the <<if>> macro can get a bit messy:

<<if $fire eq "warm">>
The fire isn't hot yet.
<<else>>
<<if $medal eq "water">>
You medal protects you.
<<else>>
<<if $dead gt 0>>
Not again!
<<else>>
You died!
<<endif>>
<<endif>>
<<endif>>

The <<else if>> macro allows you to essentially have multiple <<if>> macros chained together, without needing to nest each of them within the <<else>> / <<endif>> tag pair of the other:

<<if $fire eq "warm">>
The fire isn't hot yet.
<<else if $medal eq "water">>
You medal protects you.
<<else if $dead gt 0>>
Not again!
<<else>>
You died!
<<endif>>

The macro code is here:
Obsolete script removed: use Twine 1.4

You might wonder why I chose "else if" instead of "elseif"... I guess my mind flipped a coin and the 'natural language' side shone upward.

If someone else has already developed a similar macro, as I suspect they might, then do tell.

_{Feel free to report any bugs to @webbedspace.}