add btinclude finction to output code for usage in scripts

bashtools.sh

@@ -51,6 +51,14 @@ SPINNERFILE="$BASHTOOLS_DIR/spinner.pid"
 
 export REGEXP_IP='^([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})$'
 
+function btinclude() {
+    echo '. ${HOME}/code/bashtools/bashtools.sh'
+    echo 'if [[ -z $HAVE_BASHTOOLS ]]; then'
+    echo '    echo "ERROR: bashtools not installed download from https://git.nethack.net/rob/bashtools" >/dev/stderr'
+    echo '    exit 1'
+    echo 'fi'
+}
+
 function ansi(){
     export BOLD="\033[1m"
     export PLAIN="\033[0m"