diff --git a/README.md b/README.md
index c1322ba..1e8cfc3 100644
--- a/README.md
+++ b/README.md
@@ -115,20 +115,23 @@ Usage: gpgbridge.rb [options]
 
 ## Example bash helper functions
 
-Copy the [`gpgbridge_helper.sh`](gpgbridge_helper.sh) script to a directory
-accessible from WSL and make it (`chmod +x path/to/gpgbridge_helper.sh`).
+Unpack the release file to a directory accessible from WSL.
 
-Then add `path/to/gpgbridge_helper.sh` to your `~/.bash_profile`,
-`~/.bashrc`, `~/.zshrc` or similar. Add `--ssh` to enable SSH forwarding and
-`--wsl2` if you are running WSL2 as arguments to `gpgbridge_helper.sh`.
+Edit the PATHS section in the [`gpgbridge_helper.sh`](gpgbridge_helper.sh)
+file (or set the variables before sourcing the file.)
 
-Make sure to edit the paths in the start of the script according to your
-setup.
+Add the following commands to your `~/.bash_profile`, `~/.bashrc`,
+`~/.zshrc` or similar. Add `--ssh` to enable SSH forwarding and `--wsl2` if
+you are running WSL2..
+
+  1. Source the file: `source path/to/gpgbridge_helper.sh`.
+  2. Call the start function: `start_gpgbridge [ --ssh ] [ --wsl2 ]`.
 
 This will start the WSL-bridge in WSL, which will in turn start the
 Win-bridge in Windows. Note that only one WSL-bridge will be started per
 WSL distribution, and they will all share the same single Win-bridge
-running in Windows.
+running in Windows. If you edit the `SCRIPT_DIR` path in the file, it can
+be sourced and used from all WSL distributions.
 
 ## Known and handled problems
 
diff --git a/ReleaseNotes.md b/ReleaseNotes.md
index 3703a45..b6491e3 100644
--- a/ReleaseNotes.md
+++ b/ReleaseNotes.md
@@ -1,4 +1,4 @@
-## Changes in v1.1
+## Changes in v1.2
 
-* Added a helper script (contributed by @tetov)
+* Convert the helper script into a file with shell functions to be sourced.
 * Updated Readme documentation
diff --git a/gpgbridge_helper.sh b/gpgbridge_helper.sh
index e6adfd3..4a2c3a4 100755
--- a/gpgbridge_helper.sh
+++ b/gpgbridge_helper.sh
@@ -2,71 +2,69 @@
 #--------------------------------------------------------------------------
 # GPG bridging from WSL gpg to gpg4win gpg-agent.exe
 # (needed to use a Yubikey, since WSL cannot access USB devices)
-
-set -eu
-
-usage() {
-    echo "Usage: gpgbridge_helper [ --ssh ] [ --wsl2 ] [ -q | --quiet ] start|stop|restart"
-}
+#
+# 1. Edit the PATHS section below (or set the variables before sourcing this file.)
+# 2. Source this file
+# 3. Call "start_gpgbridge [ --ssh ] [ --wsl2 ]".
 
 # PATHS
-SCRIPT_DIR=/mnt/c/Program1/gpgbridge
+SCRIPT_DIR_WSL="${SCRIPT_DIR_WSL:-/mnt/c/Program1/gpgbridge}"
 
-PIDFILE_WSL="$HOME/.gpgbridge_wsl.pid"
-LOGFILE_WSL="$HOME/.gpgbridge_wsl.log"
+PIDFILE_WSL="${PIDFILE_WSL:-$HOME/.gpgbridge_wsl.pid}"
+LOGFILE_WSL="${LOGFILE_WSL:-$HOME/.gpgbridge_wsl.log}"
 
-_pidfile_win="$SCRIPT_DIR/gpgbridge_win.pid"
-_logfile_win="$SCRIPT_DIR/gpgbridge_win.log"
+PIDFILE_WIN="${PIDFILE_WIN:-$SCRIPT_DIR_WSL/gpgbridge_win.pid}"
+LOGFILE_WIN="${LOGFILE_WIN:-$SCRIPT_DIR_WSL/gpgbridge_win.log}"
 
-touch "$_pidfile_win" "$_logfile_win"  # Needs to be created otherwise wslpath complains
-PIDFILE_WIN=$(wslpath -wa $_pidfile_win)
-LOGFILE_WIN=$(wslpath -wa $_logfile_win)
+#---------------------------------------------------------------------------
+# Do not edit below this line
 
-SCRIPT_FILE_NAME=gpgbridge.rb
-
-SCRIPT_PATH_WSL="$SCRIPT_DIR/$SCRIPT_FILE_NAME"
+touch "$PIDFILE_WIN" "$LOGFILE_WIN"  # Needs to be created otherwise wslpath complains
+PIDFILE_WIN="$(wslpath -wa "$PIDFILE_WIN")"
+LOGFILE_WIN="$(wslpath -wa "$LOGFILE_WIN")"
 
 start_gpgbridge()
 {
-    if ! command -v ruby.exe >/dev/null 2>&1 ; then
-        echo 'No ruby.exe found in path'
-        return 1
-    fi
-
-    args="$(_quote "$SCRIPT_PATH_WSL") --daemon"
-
-    if [ -n "${PIDFILE_WSL:-}" ] ; then
-	args="$args --pidfile $(_quote "$PIDFILE_WSL")"
-    fi
-
-    if [ -n "${LOGFILE_WSL:-}" ] ; then
-	args="$args --logfile $(_quote "$LOGFILE_WSL")"
+    if ! command -v ruby.exe >/dev/null
+    then
+	echo 'No ruby.exe found in path'
+	return 1
     fi
 
-    if [ -n "${PIDFILE_WIN:-}" ] ; then
-	args="$args --windows-pidfile $(_quote "$PIDFILE_WIN")"
-    fi
-
-    if [ -n "${LOGFILE_WIN:-}" ] ; then
-	args="$args --windows-logfile $(_quote "$LOGFILE_WIN")"
-    fi
+    # Parse arguments
+    #local _opts _parsed_args _is_args_valid
+    _parsed_args=$(getopt -a -n start_gpgbridge -o h --long ssh,wsl2,help -- "$@")
+    _is_args_valid=$?
 
-    if [ "$SSH" -eq 1 ] ; then
-        args="$args --enable-ssh-support"
-        SSH_AUTH_SOCK=$(gpgconf --list-dirs agent-ssh-socket)
-        export SSH_AUTH_SOCK
+    if [ ! $_is_args_valid ] ; then
+	echo "Usage: start_gpgbridge [ --ssh ] [ --wsl2 ]"
+	unset _parsed_args _is_args_valid
+	exit 1
     fi
 
-    if [ "$WSL2" -eq 1 ] ; then
-	wsl_ip="$(ip route | awk '/^default via / {print $3}')"
-	args="$args --remote-address $wsl_ip"
-    fi
-
-    if [ "$QUIET" -eq 1 ] ; then
-        args="$args >/dev/null 2>&1"
-    fi
-
-    eval ruby "$args"
+    _opts=''
+    eval set -- "$_parsed_args"
+    while :
+    do
+	case "$1" in
+	    --ssh)
+		_opts="$_opts --enable-ssh-support"
+		SSH_AUTH_SOCK=$(gpgconf --list-dirs agent-ssh-socket)
+		export SSH_AUTH_SOCK
+		shift
+		;;
+	    --wsl2)
+		_opts="$_opts --remote-address $(ip route | awk '/^default via / {print $3}')"
+		shift
+		;;
+	    --)
+		shift
+		break
+	esac
+    done
+
+    ruby "$SCRIPT_DIR_WSL/gpgbridge.rb" --daemon --pidfile "$PIDFILE_WSL" --logfile "$LOGFILE_WSL" --windows-pidfile "$PIDFILE_WIN" --windows-logfile "$LOGFILE_WIN" ${_opts}
+    unset _parsed_args _is_args_valid _opts
 }
 
 stop_gpgbridge()
@@ -79,46 +77,5 @@ restart_gpgbridge()
 {
     stop_gpgbridge
     sleep 1
-    start_gpgbridge
+    start_gpgbridge "$@"
 }
-
-# From "Rich's sh (POSIX shell) tricks" https://www.etalabs.net/sh_tricks.html
-_quote () { printf %s\\n "$1" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/'/" ; }
-
-# Default arguments
-SSH=0
-WSL2=0
-QUIET=0
-
-# Parse arguments
-PARSED_ARGS=$(getopt -a -n gpgbridge_helper -o qh --long quiet,ssh,wsl2,help -- "$@")
-IS_ARGS_VALID=$?
-
-if [ ! $IS_ARGS_VALID ] ; then
-    usage
-    exit 1
-fi
-
-eval set -- "$PARSED_ARGS"
-while :
-do
-    case "$1" in
-	--ssh)            SSH=1   ; shift ;;
-	--wsl2)           WSL2=1  ; shift ;;
-	-q | --quiet)     QUIET=1 ; shift ;;
-	-h | --help)      usage && exit 0 ;;
-	--) shift ; break ;;
-    esac
-done
-
-if [ -z "${1:-}" ] ; then
-    usage
-    exit 1
-fi
-
-case "$1" in
-    start)   start_gpgbridge ;;
-    stop)    stop_gpgbridge ;;
-    restart) restart_gpgbridge ;;
-    *)       usage && exit 1 ;;
-esac