Fix up 2to3 complaints. I've decided to do with wrapping list
comprehension inside list() to get the generators to run in several
places instead of list(map( or list(filter( which seem less readable to
me.
Commit d2ae92b4b3 patched up the download counter and progress
display. Yum no longer provides the needed information so now we get the
total number of packages from the start of the transaction.
This also turns off colors when stdout is not a tty, and only prints the
install progress once so that piping to a logfile isn't flooded with
useless characters.
Added support for Mako templates.
Changed the Lorax class to require an yumbase object as a parameter.
Changed a lot of unnecessary system calls to native python code.
Moved most of the file paths into a separate object.
The output and config objects are now singletons.
Also done a lot of code cleanup.
