This is the readme file for my patch-index repo
Find the orginal readme at README.darcs

These are the commands implemented:
   darcs optimize --patch-index : create/update a patch index
   darcs show patch-index-all : dump the entire patch index data structures
   darcs show patch-index-files : show all the files tracked by patch index
   darcs show patch-index-status : tell if the patch index is in sync/out of sync/not created
   darcs changes --patch-index  : output changes using patch index
   darcs show patch-index-annotate FILE : output annotate of FILE using patch index
   darcs show patch-index-annotate DIR : output annotate of DIR using patch index

On darcs repository, the time taken for these commands are:
 for creating a new patch-index : 6.4 sec
 for updating patch-index with one patch : 0.8 sec
 for telling if the patch index is in sync: 0.03 sec
 for changes on GNUMakeFile : 0.61 sec
 for annotate on GNUMakeFile : 0.86 sec

The patch index invisibly update itself.
It will be automatically created when the repo is created,
automatically updated when repo is updated.