path: root/session.bash

# Copyright (C) 2021, 2022 Soni L.
# SPDX-License-Identifier: AGPL-3.0-or-later

# note: consider adding the following to your PS1:
PS1='{$([[ "${HISTFILE#~/.bash_history.}" != "$HISTFILE" ]] && printf "@ " || printf "/ ")${HISTFILE#~/.bash_history.}} '"$PS1"

if [[ "$HISTFILE" = ~/.bash_history ]]; then
	HISTFILE="$HISTFILE".default
fi

# simple interface to history/"session" management
# usage: session <name>
# switches HISTFILE to ~/.bash_history.<name>
session() {
	if [[ "$1" =~ ^[a-z][a-z0-9]*$ ]]; then
		# remove session switch from history
		history -d -1
		# write/append history
		if shopt -q histappend; then history -a; else history -w; fi
		# clear history
		history -c
		# set HISTFILE
		HISTFILE=~/.bash_history."$1"
		# load new session's history
		history -r
		# see setsessioncwd()
		eval "$(grep -s '# '"$1"'$' ~/.bash_session_cwd | tail -n 1)"
	else
		echo "invalid session"
		false
	fi
}
# setup completion for session(), using only builtins
complete -C 'source <(printf "%s" '\''
	set -- ~/.bash_history."$2"*
	flag=0
	[[ -e "$1" ]] && for f in "${@#~/.bash_history.}" ; do
		if [[ "$f" =~ ^[a-z][a-z0-9]*$ ]] ; then
			((flag)) && printf "\n"
			printf "%s" "$f"
			flag=1
		fi
	done
'\'')' session

# sets the current cwd as the default cwd for the session
setsessioncwd() {
	local session
	# guard against relative HISTFILE
	if [[ "${HISTFILE#~/.bash_history.}" != "$HISTFILE" ]]; then
		session="${HISTFILE#~/.bash_history.}"
		if [[ "$session" =~ ^[a-z][a-z0-9]*$ ]]; then
			printf 'cd %q # %s\n' "$PWD" "$session" >>~/.bash_session_cwd
		else
			echo "invalid session"
			false
		fi
	else
		echo "invalid session"
		false
	fi
}

# saves the current working directory into the current history.
# does NOT save to the history *file*.
savecwd() {
	history -s "$(printf 'cd %q' "$PWD")"
}