new storage subcommand (storage put and storage get), enables data storage inside generations

new repair subcommand, ensures all entries of each handler for the current generation are installed (in case of change outside of eugene)

diff subcommand now takes an optional handler argument

remove the use of EUGENE_HOOKS environment variable

add man page

make status codes consistent: 0 is ok, 1 is process error, 2 is command (user) error

prettier logging

add run_if parameter in handler config: the handler will only trigger if the command is successful

conditional setup commands for handlers with when/run pairs

can be used to install flatpak with apt or with pacman depending on distro, for example

eugène's changelog

v2

eugène repo is now ${XDG_CONFIG_HOME:-$HOME/.config}/eugene by default
eugène generations dir is now ${XDG_DATA_HOME:-$HOME/.local}/state/eugene by default
handlers now match handlername* and $(hostname)_handlername* files in repo, this enabled host-specific entries
new apply subcommand, equivalent to eugene build && eugene switch latest
switch now fails if any handler command fails
new align subcommand, removes gaps in generations numbers, eg. [0, 2, 3, 6] -> [0, 1, 2, 3]
bugfix: correctly raise an error when toGen argument is invalid in diff subcommand
when switching to a new generation, the following environment variables can now be used in scripts:
- EUGENE_CURRENT_GEN, the current generation, eg. 1
- EUGENE_TARGET_GEN, the target generation, eg. 2
- EUGENE_HANDLER_NAME, the currently running handler, eg. apt_pkgs
new deletedups subcommand, automatically deletes duplicate generations
new rollback subcommand, switches back to n generations ago
automatically generated configuration file is now set to mode 644 (not executable anymore)