zsh verkürzen die Länge des aktuellen Pfads

Question

Immer wenn ich tiefer in ein Verzeichnis navigiere, zeigt zsh den vollständigen Pfad in der Eingabeaufforderung an.

Statt

x@y:~/i/am/a/really/really/really/really/long/path/somewhere

der Anzeige würde ich lieber mag

x@y:~/path/somewhere

haben Wie kann ich das erreichen?

Ich verwende zsh mit iTerm auf OSX Yosemite 10.10.4.

EDIT:

Hier ist meine .bashrc-Datei:

1 # System-wide .bashrc file for interactive bash(1) shells. 
    2 if [ -z "$PS1" ]; then 
    3 return 
    4 fi 
    5 
    6 PS1='\h:\W \u\$ ' 
    7 # Make bash check its window size after a process completes 
    8 shopt -s checkwinsize 
    9 # Tell the terminal about the working directory at each prompt. 
    10 if [ "$TERM_PROGRAM" == "Apple_Terminal" ] && [ -z "$INSIDE_EMACS" ]; then 
    11  update_terminal_cwd() { 
    12   # Identify the directory using a "file:" scheme URL, 
    13   # including the host name to disambiguate local vs. 
    14   # remote connections. Percent-escape spaces. 
    15   local SEARCH=' ' 
    16   local REPLACE='%20' 
    17   local PWD_URL="file://$HOSTNAME${PWD//$SEARCH/$REPLACE}" 
    18   printf '\e]7;%s\a' "$PWD_URL" 
    19  } 
    20  PROMPT_COMMAND="update_terminal_cwd; $PROMPT_COMMAND" 
    21 fi 

Answer 1

Um eine Anzahl der angezeigten Hinter Komponenten des Pfades geben Sie eine ganze Zahl einfügen in Escape-Sequenz in der Eingabeaufforderung entspricht. In Ihrem Fall wird %2~ den Trick machen. Auszug aus zshmisc (1):

%d 
%/  Current working directory. If an integer follows the `%', 
     it specifies a number of trailing components of the current 
     working directory to show; zero means the whole path. A 
     negative integer specifies leading components, i.e. %-1d 
     specifies the first component. 

%~  As %d and %/, but if the current working directory starts 
     with $HOME, that part is replaced by a `~'. Furthermore, if 
     it has a named directory as its prefix, that part is replaced 
     by a `~' followed by the name of the directory, but only if 
     the result is shorter than the full path; see Dynamic and 
     Static named directories in zshexpn(1).