Self Update doesn't work with kscript v1.5.0 (fixes #30)

Author: holgerbrandl

kscript

@@ -56,6 +56,7 @@ if [ $# == 0 ]  || [ "$1" == "-v" ] || [ "$1" == "--version" ] || [ "$1" == "-h"
     installedVersion=$(echo $KSCRIPT_VERSION | tr -d '.')
 
     ## http://stackoverflow.com/questions/15224581/floating-point-comparison-with-variable-in-bash
+    ## fixme bc is a dependency, use a kscriptlet here
     if [ $(echo " ${latestVersion} > ${installedVersion}" | bc) -eq 1 ]; then
         bold=$(tput bold); normal=$(tput sgr0)     ## http://stackoverflow.com/questions/2924697/how-does-one-output-bold-text-in-bash
         echo -e "\n${bold}A new version of kscript is available. Use 'kscript --self-update' to update your local kscript installation" >&2
@@ -89,9 +90,14 @@ fi
 
 
 ## optionally self-update kscript ot the newest version (if not local copy is not being maintained by sdkman)
-if [[ "$1" == "--self-update" ]] && [[ -z "$(which kotlin | grep .sdkman)" ]]; then
-    echo "Installing latest version of kscript..."
-    kurl https://git.io/v9R73 > $(which kscript) && chmod u+x $(which kscript)
+if [[ "$1" == "--self-update" ]]; then
+    ## choose update strategy depending on installation type
+    if  [[ -z "$(which kscript | grep .sdkman)" ]]; then
+        echo "Installing latest version of kscript..."
+        kurl https://git.io/v9R73 > $(which kscript) && chmod u+x $(which kscript)
+    else
+        sdkman_auto_answer=true && sdk install kscript
+    fi
 
     echo "You're now running kscript "$(kscript --help 2>&1| grep Version | cut -f2- | tr -d ':')
     exit 0