@url{https://en.wikipedia.org/wiki/DOT_(graph_description_language), DOT}
graph generator. For example to visualize your dependencies with GraphViz:
@example
-$ redo target [...] # to assure that **/.redo/*.dep are filled up
+$ redo target [...] # to assure that **/.redo/*.rec are filled up
$ redo-dot target [...] > whatever.dot
$ dot -Tpng whatever.dot > whatever.png # possibly add -Gsplines=ortho
@end example