[dllthomas]

What I do is split up my work by context into different screen (or tmux, depending on mood when I set up the computer) sessions. I have a script that attaches one by name if it's present and otherwise creates one with the name in question after setting an environment variable that's therefore inherited by any shells spawned in that screen session. Various things in my bashrc then look at that environment variable to point things at a context specific config directory, including setting HISTFILE to a context specific history file and sourcing a context specific bashrc (in which I often cd to a relevant directory and may set some variables, functions, and aliases specific to the context).