tinydir

#==========================================================================
# File            : tinydir
# Description     : Shortens the folder name with environment variables. For example try : export JAVA__HOME=<somedir>; cd $JAVA_HOME; tinydir $PWD
# @(#)
#/bin/env python
#
# Revision History:
#
#   18 Oct 2017 - Sivaswami Jeganathan
#      Initial Version.
#==========================================================================
import os, sys
def folderShortener(curpath):
    originalPath=curpath
    folderMap={val:key for (key,val) in os.environ.items() if os.path.sep in val and os.path.pathsep not in val and "PWD" not in key}
    #for (key,val) in folderMap.items():
    #    print(val + "=>" + key)
    #curpath=os.getcwd()
    remainingPath=""
    while (curpath !="~" and curpath !="/" and os.path.ismount(curpath)==False and curpath not in folderMap) :
        remainingPath=os.path.basename(curpath)+"/"+remainingPath
        curpath=os.path.dirname(curpath)
        #print("DEBUG:  curpath = " + curpath + " remainingPath = " + remainingPath)
    if (curpath !="~" and curpath !="/"):
        curpath=folderMap.get(curpath);
        if (curpath is not None):
            return ("${"+curpath +"}/"+remainingPath)
        else:
            return originalPath
    else:
        return originalPath

if len(sys.argv) < 2:
        pwd = os.getcwd()
else:
        pwd = sys.argv[1]
homedir = os.path.expanduser('~')
pwd = pwd.replace(homedir, '~', 1)
pwd=folderShortener(pwd)
if len(pwd) > 45:
    pwd = pwd[:20]+'...'+pwd[-25:] # first 10 chars+last 20 chars
print ('%s' % pwd)