Hammer’s ‘undo’ now has the ability to index and automatically diff historical versions of files for you, thanks to a patch from Joel K. Pettersson. (He’s got more ideas, too.
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A running description of activity related to DragonFly BSD.
Just to note, as can also be seen in the previous parts of the mail exchange: The patch took its final form with the help of feedback from Matthew, and as for this part:
“Automatically go into DIFF mode (-d) by default if two -t options are specified, unless overridden.”
He added this to the changes of the patch, though while mentioned in his last mail he didn’t take the credit for it in the commit.