bash completion: ipython <tab> shows only subcmds

If a partial filename, or an flag or option argument is invoked, those
completions will still take place, but by default, to aid the user in
the discovery of subcommands, pressing tab immediately after ipython
will list *only* the subcommands as possible completions

examples/core/ipython-completion.bash

@@ -1,113 +1,113 b''
 # load with: . ipython-completion.bash
 
 if [[ -n ${ZSH_VERSION-} ]]; then
     autoload -Uz bashcompinit && bashcompinit
 fi
 
 _ipython_get_flags()
 {
     local url=$1
     local var=$2
     local dash=$3
     if [[ "$url $var" == $__ipython_complete_last ]]; then
         opts=$__ipython_complete_last_res
         return
     fi
     # pylab and profile don't need the = and the
     # version without simplifies the special cased completion
     opts=$(ipython ${url} --help-all | grep -E "^-{1,2}[^-]" | sed -e "s/<.*//" -e "s/[^=]$/& /" -e "s/^--pylab=$//" -e "s/^--profile=$/--profile /")
     __ipython_complete_last="$url $var"
     __ipython_complete_last_res="$opts"
 }
 
 _ipython()
 {
     local cur=${COMP_WORDS[COMP_CWORD]}
     local prev=${COMP_WORDS[COMP_CWORD - 1]}
     local subcommands="notebook qtconsole console kernel profile locate history nbconvert"
     local opts=""
     if [ -z "$__ipython_complete_baseopts" ]; then
         _ipython_get_flags baseopts
         __ipython_complete_baseopts="${opts}"
     fi
     local baseopts="$__ipython_complete_baseopts"
     local mode=""
     for i in "${COMP_WORDS[@]}"; do
         [ "$cur" = "$i" ] && break
         if [[ ${subcommands} == *${i}* ]]; then
             mode="$i"
             break
         elif [[ ${i} == "--"* ]]; then
             mode="nosubcommand"
             break
         fi
     done
 
 
     if [[ ${cur} == -* ]]; then
         case $mode in
             "notebook" | "qtconsole" | "console" | "kernel")
                 _ipython_get_flags $mode
                 opts=$"${opts} ${baseopts}"
                 ;;
             "locate" | "history" | "profile")
                 _ipython_get_flags $mode
                 opts=$"${opts}"
                 ;;
             *)
                 opts=$baseopts
         esac
         # don't drop the trailing space
         local IFS=$'\t\n'
         COMPREPLY=( $(compgen -W "${opts}" -- ${cur}) )
         return 0
     elif [[ $mode == "profile" ]]; then
         opts="list create locate"
         COMPREPLY=( $(compgen -W "${opts}" -- ${cur}) )
     elif [[ $mode == "history" ]]; then
         opts="trim"
         COMPREPLY=( $(compgen -W "${opts}" -- ${cur}) )
     elif [[ $mode == "locate" ]]; then
         opts="profile"
         COMPREPLY=( $(compgen -W "${opts}" -- ${cur}) )
     elif [[ ${prev} == "--pylab"* ]] || [[ ${prev} == "--gui"* ]]; then
         if [ -z "$__ipython_complete_pylab" ]; then
             __ipython_complete_pylab=`cat <<EOF | python -
 try:
     import IPython.core.shellapp as mod;
     for k in mod.InteractiveShellApp.pylab.values:
         print "%s " % k
 except:
     pass
 EOF
         `
         fi
         local IFS=$'\t\n'
         COMPREPLY=( $(compgen -W "${__ipython_complete_pylab}" -- ${cur}) )
     elif [[ ${prev} == "--profile"* ]]; then
         if [ -z  "$__ipython_complete_profiles" ]; then
         __ipython_complete_profiles=`cat <<EOF | python -
 try:
     import IPython.core.profileapp
     for k in IPython.core.profileapp.list_bundled_profiles():
         print "%s " % k
     p = IPython.core.profileapp.ProfileList()
     for k in IPython.core.profileapp.list_profiles_in(p.ipython_dir):
         print "%s " % k
 except:
     pass
 EOF
         `
         fi
         local IFS=$'\t\n'
         COMPREPLY=( $(compgen -W "${__ipython_complete_profiles}" -- ${cur}) )
     else
-        if [ -z "$mode" ]; then
-            COMPREPLY=( $(compgen -f -W "${subcommands}" -- ${cur}) )
+        if [ "$COMP_CWORD" == 1 ]; then
+            COMPREPLY=( $(compgen -W "${subcommands}" -- ${cur}) )
         else
             COMPREPLY=( $(compgen -f -- ${cur}) )
         fi
     fi
 
 }
 complete -o default -o nospace -F _ipython ipython