[Feature request] loop through a period of history

[rybak]

Currently, when --loop option is used, gource jumps to the start of the log at the end. I want an ability to loop to the position specified by --start-position, -p or --start-date options.

Although my use case doesn't need same behavior for --stop-position option, it seems reasonable to also take into consideration the end position options.

What I'm proposing is the following: change behavior of --loop option, so that

gource --start-position X --stop-position Y --loop

behaves like bash script

while true
do
    gource --start-position X --stop-position Y
done

but without overhead for reading log every time.

[ryanfinken]

Same, but I would also like --loop to respect --start-date and --stop-date. Is this possible?