odgi flip -r/--ref-flips: flip with respect to a set of paths (used as references)

[AndreaGuarracino]

This helps preserve coordinate systems on paths (ref paths) that should not be reversed and orient all other paths on those ref paths.

Input graph:

odgi viz -i x.og -o x.png -z

Flipped graph:

odgi flip -i x.og -o - | odgi viz -i - -o x.png -z

Flipped graph by not flipping the chm13#chr6:31825263-31908622 path:

odgi flip -i x.og -o - -n <(echo chm13#chr6:31825263-31908622) | odgi viz -i - -o x.png -z

Flipped graph w.r.t. the chm13#chr6:31825263-31908622 path:

odgi flip -i x.og -o - -r <(echo chm13#chr6:31825263-31908622) | odgi viz -i - -o x.png -z

[AndreaGuarracino]

It may also be useful to flip the graph nodes, not only paths.