moving prompt utils out of bash prompt

bash/prompt

@@ -1,66 +1,4 @@
-
-# truncates a string on the left
-# $1: string to truncate
-# $2: maximum length
-# $3: truncation string replacement (optional)
-# $4: separator symbol (optional, prevents truncation of rightmost item)
-__truncate_left() {
-    local str="$1"
-    local maxlen="$2"
-    local trunc_symbol="$3"
-    local sep_symbol="$4"
-
-    # get minimum length to not truncate a long name
-    if [ -n "$sep_symbol" ]
-    then
-        local component=${1##*$sep_symbol}
-        maxlen=$(( ( maxlen < ${#component} ) ? ${#component} : maxlen ))
-    fi
-
-    # truncation point
-    local offset=$(( ${#str} - maxlen ))
-
-    if [ ${offset} -gt "0" ]
-    then
-        #truncation is needed
-        str=${str:$offset:$maxlen}  #truncate
-        str=${trunc_symbol}/${str#*/}  #add symbol
-    fi
-    echo "$str"
-}
-
-# truncates a path
-__truncate_path() {
-    #gain some place with '~'
-    local path=${1/#$HOME/\~}
-    __truncate_left "$path" 25 '…' '/'
-}
-
-# truncates CWD
-__tpwd() {
-    __truncate_path "$PWD"
-}
-
-# clears a line that was not terminated by a LF
-# fixing the dangling prompt issue
-# marks it with a reverse %, like zsh
-clear_incomplete_line() {
-    # ask for cursor position
-    echo -en "\033[6n"
-    # read answer
-    IFS=';' read -r -d R -a pos
-    # extract tput-compatible answer
-    local row=$((${pos[0]:2} - 1))
-    local col=$((${pos[1]} - 1))
-    # move back over terminal answer echo, which will hopefully be overwritten
-    tput cup $row $col
-
-    # not on first column? clean up! (overwrites answer)
-    # we print a terminal width worth of columns, but since 
-    # it goes too far, we backtrack with CR
-    [[ $col != 0 ]] && printf "\e[7m%%\e[m%*s\r" $((COLUMNS-1))
-    # else e.g prompt will overwrite answer echo
-}
+source "$DOTFILES_SHELL_DIR/prompt_utils"
 
 # git prompt info
 source $DOTFILES_SHELL_DIR/git_prompt_info