fix bash-completion code

When transferring from ipython, the jupyter-completion.bash file was
not adapted correctly, leading to a segfault. This patch fixes the
issue.

examples/jupyter-completion.bash

@@ -4,20 +4,20 @@ if [[ -n ${ZSH_VERSION-} ]]; then
     autoload -Uz bashcompinit && bashcompinit
 fi
 
-_jupyter()
+_jupyter_get_flags()
 {
     local url=$1
     local var=$2
     local dash=$3
-    if [[ "$url $var" == $__jupyter ]]; then
-        opts=$__jupyter
+    if [[ "$url $var" == $__jupyter_complete_last ]]; then
+        opts=$__jupyter_complete_last_res
         return
     fi
     # matplotlib and profile don't need the = and the
     # version without simplifies the special cased completion
     opts=$(jupyter ${url} --help-all | grep -E "^-{1,2}[^-]" | sed -e "s/<.*//" -e "s/[^=]$/& /" -e "$ s/^/\n-h\n--help\n--help-all\n/")
-    __jupyter="$url $var"
-    __jupyter="$opts"
+    __jupyter_complete_last="$url $var"
+    __jupyter_complete_last_res="$opts"
 }
 
 _jupyter()
@@ -26,11 +26,11 @@ _jupyter()
     local prev=${COMP_WORDS[COMP_CWORD - 1]}
     local subcommands="notebook qtconsole console nbconvert kernelspec trust "
     local opts="help"
-    if [ -z "$__jupyter" ]; then
-        _jupyter baseopts
-        __jupyter="${opts}"
+    if [ -z "$__jupyter_complete_baseopts" ]; then
+        _jupyter_get_flags baseopts
+        __jupyter_complete_baseopts="${opts}"
     fi
-    local baseopts="$__jupyter"
+    local baseopts="$__jupyter_complete_baseopts"
     local mode=""
     for i in "${COMP_WORDS[@]}"; do
         [ "$cur" = "$i" ] && break
@@ -47,15 +47,15 @@ _jupyter()
     if [[ ${cur} == -* ]]; then
         case $mode in
             "notebook" | "qtconsole" | "console" | "nbconvert")
-                _jupyter $mode
+                _jupyter_get_flags $mode
                 opts=$"${opts} ${baseopts}"
                 ;;
             "kernelspec")
                 if [[ $COMP_CWORD -ge 3 ]]; then
                     # 'history trim' and 'history clear' covered by next line
-                    _jupyter $mode\ "${COMP_WORDS[2]}"
+                    _jupyter_get_flags $mode\ "${COMP_WORDS[2]}"
                 else
-                    _jupyter $mode
+                    _jupyter_get_flags $mode
 
                 fi
                 opts=$"${opts}"