[bug #60618] Fixed directory string being removed on pressing TAB

[Pedram Ashofteh Ardakani]

Follow-up Comment #5, bug #60618 (project gnuastro):

Look what I found straight from 'info'! Just type in: 'info bash program' and
then use ']' and navigate to 'A programmable completion example'. Then you can
find the actual bash completion program written for 'cd' itself!

Does it give you any ideas?

++++
     # A completion function for the cd builtin
     # based on the cd completion function from the bash_completion package
     _comp_cd()
     {
         local IFS=$' \t\n'    # normalize IFS
         local cur _skipdot _cdpath
         local i j k

         # Tilde expansion, which also expands tilde to full pathname
         case "$2" in
         \~*)    eval cur="$2" ;;
         *)      cur=$2 ;;
         esac

         # no cdpath or absolute pathname -- straight directory completion
         if [[ -z "${CDPATH:-}" ]] || [[ "$cur" == @(./*|../*|/*) ]]; then
             # compgen prints paths one per line; could also use while loop
             IFS=$'\n'
             COMPREPLY=( $(compgen -d -- "$cur") )
             IFS=$' \t\n'
         # CDPATH+directories in the current directory if not in CDPATH
         else
             IFS=$'\n'
             _skipdot=false
             # preprocess CDPATH to convert null directory names to .
             _cdpath=${CDPATH/#:/.:}
             _cdpath=${_cdpath//::/:.:}
             _cdpath=${_cdpath/%:/:.}
             for i in ${_cdpath//:/$'\n'}; do
                 if [[ $i -ef . ]]; then _skipdot=true; fi
                 k="${#COMPREPLY[@]}"
                 for j in $( compgen -d -- "$i/$cur" ); do
                     COMPREPLY[k++]=${j#$i/}        # cut off directory
                 done
             done
             $_skipdot || COMPREPLY+=( $(compgen -d -- "$cur") )
             IFS=$' \t\n'
         fi

         # variable names if appropriate shell option set and no completions
         if shopt -q cdable_vars && [[ ${#COMPREPLY[@]} -eq 0 ]]; then
             COMPREPLY=( $(compgen -v -- "$cur") )
         fi

         return 0
     }
----

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