A custom script allowing to run bukuserver and switch out between multiple databases

bukuserver.sh

#!/bin/bash
# Usage: `bukuserver.sh` starts up the server, `bukuserver.sh --stop` sends TERM to the already running server
# On startup, the user is offered to choose or create a new DB (cancel both to exit)
# After the server stops (via CTRL+C or `bukuserver --stop`), the choice is given again
# NOTE: requires Zenity to work
# Environment variables (override defaults via CLI or by modifying the script):
#   DEVMODE       non-empty value enables developer mode (rebuild on restart)
#   BUKUSERVER    path to executable, or directory to run from source
#   VENV          path to venv (default is relative to BUKUSERVER if in DEVMODE)
#   BUKUSERVER_*  Web-UI startup settings (see Bukuserver docs)
# specify default Web-UI settings in "$BUKU_CONFIG_DIR/bukuserver.env"

: "${BUKUSERVER:=`which bukuserver`}"
[ "$DEVMODE" ] && : "${VENV:=./venv}" || : "${VENV:=$HOME/.local/share/bukuserver/venv}"
BUKU_CONFIG_DIR=~/.local/share/buku


function _settermtitle { echo -en "\033]2;$1\007"; }  # changes terminal title

function _select-db {  # offers a choice between DBs in buku config dir, or to make a new one
	if [ "$1" ] && zenity --question --title="Reuse previous DB?" --text="'$(basename "${1%.db}")'"; then
		echo "$1"
		return
	fi
	local -a FILES
	while read FILE; do
		[ -e "$FILE" ] && FILES+=( "$(basename "${FILE%.db}")" )
	done < <(ls -1 "$BUKU_CONFIG_DIR"/{,.}*.db 2>/dev/null | sort)
	local FILE
	if [ ${#FILES[@]} != 0 ]; then
		FILE=`zenity --list --title="Choose DB" --text="(or click Cancel to create new DB)" --column="Name" -- "${FILES[@]}"`
		[ "$FILE" ] && echo "$BUKU_CONFIG_DIR/$FILE.db" && return
	fi
	while true; do
		FILE=`zenity --entry --title="Create new DB?" --text="DB name (cannot contain '/'):" --entry-text="bookmarks"`
		! [ "$FILE" ] && echo "No name given, qutting" >&2 && return
		[[ "$FILE" == *'/'* ]] && zenity --error --text="DB name cannot contain '/'!" && continue
		[ -e "$BUKU_CONFIG_DIR/$FILE.db" ] && ! zenity --question --text="'$FILE' exists already. Open anyway?" && continue
		echo "$BUKU_CONFIG_DIR/$FILE.db"
		return
	done
}


# --stop implementation
if [ "$1" == '--stop' ]; then  # stop existing server (or switch between DBs)
	PID=`ps -afu "$USER" | grep '\bpython[^ ]* \(.*/bukuserver\|bukuserver/server\.py\) run$' | awk '{print $2}'`
	[ "$PID" ] && kill "$PID"
	exit
fi

_settermtitle 'bukuserver'

# loading default Web-UI settings
ENV_ENTRY='^([_A-Z]*)=("(.*)"|'\''(.*)'\''|(.*))$'
[ -r "$BUKU_CONFIG_DIR/bukuserver.env" ] && while read -r; do
	if [[ $REPLY =~ $ENV_ENTRY ]]; then
		KEY="${BASH_REMATCH[1]}"
		VALUE="${BASH_REMATCH[3]}${BASH_REMATCH[4]}${BASH_REMATCH[5]}"
		echo "default:$KEY=$VALUE"
		[ "${!KEY}" ] || export "$KEY=$VALUE"
	fi
done < "$BUKU_CONFIG_DIR/bukuserver.env"

# initializing venv
if [ -d "$BUKUSERVER" ]; then  # run from source (using venv)
	cd "$BUKUSERVER"
	echo "Using '$(realpath "$VENV")'"
	python -m venv "$VENV"
	. "$VENV/bin/activate"
	if ! [ "$DEVMODE" ]; then
		pip install .[server]
	else
		pip install --editable .[server]
		function bukuserver { python bukuserver/server.py "$@"; }
		export -f bukuserver
	fi
	BUKUSERVER='bukuserver'
fi

# DB reopening loop
export BUKUSERVER_DB_FILE=`_select-db`
while [ "$BUKUSERVER_DB_FILE" ]; do
	"$BUKUSERVER" run
	export BUKUSERVER_DB_FILE=`_select-db "${DEVMODE:+$BUKUSERVER_DB_FILE}"`
done

Sample bukuserver.env:

BUKUSERVER_THEME='slate'
BUKUSERVER_DISABLE_FAVICON=false
BUKUSERVER_OPEN_IN_NEW_TAB=true

Shown in DEVMODE (developer mode) when restarting the server

Shown on startup (unless no DB files were found):

Shown if no DB was selected (or none found):

Shown if new DB name is taken already:

Shown if DB name contains an invalid character (/):