bashrc hacks for per-directory history

.bashrc

# Hack to implement per-directory history. If you run the same commands in the same directories,
# then why not have a separate history for each directory?

HISTBASE=~/.bash_directory_hist
LASTHIST=

_hash() {
echo "$@" | sha512sum | cut -f1 -d' '
}

_load_history() {
LASTHIST="$HISTBASE/$(_hash $(pwd))"
HISTFILE=$LASTHIST
history -c
history -r
}

prompt_cd() {
NEXTHISTFILE="$HISTBASE/$(_hash $(pwd))"
#if [ "$LASTHIST" -ne "$NEXTHISTFILE" ]
#then
	history -w
	_load_history
#fi
}

PROMPT_COMMAND=prompt_cd
mkdir -p "$HISTBASE"
_load_history