Feature request: progress %

[BuyMyMojo]

My suggestion is reporting the progress of the current file back to the console, I don't know how possible this is but it could be for -o max and showing the % of combinations tried

[shssoichiro]

This is a little difficult to implement precisely, but some sort of estimate could be done.

[masklinn]

One area where it would be super useful would be the recursive / multi-file mode. When using oxipng on a lot of images, especially with the intent of doing massive crushing (e.g. -omax -Z) it can be difficult to keep track of where it's at, and whether it'll be done in 5 more minutes or you'll probably need to resume the run later.