image_optim installs without checking for existence of /usr/bin/which

[grepwood]

While trying to optimize a picture, image_optim failed because /usr/bin/which was not present on the system. Is it possible that Gem would check if /usr/bin/which exists so that it can install only if this dependency is satisfied?

[toy]

Do you mean not installing gem if which is not present?
Looking at stackoverflow question it seems better to avoid which. Also it seems that it would be best to use version method which should return empty string if binary is not present.

[grepwood]

Exactly. The code that requires which is lib/image_optim/config.rblib/image_optim/binary_resolver.rb and on some systems which isn't provided by default. The user has to install it on their own. If you're planning on replacing which with builtin bash functions, then #59 will become a non-issue as soon as that happens. Confirming that it's fixed.