~/cmd.log

.zshrc

preexec () {
    START="$(python -c 'import time; print(time.time())')"
    LAST_CMD=$1
    export SHELL_ID="$(python -c 'import uuid; print(uuid.uuid4())')"
}

precmd () {
    LAST=$?
    if [ -z ${START} ];
    then
    else
        echo -n "Executed [$LAST_CMD: $LAST] in "
        ~/bin/precmd "$START" "$LAST_CMD" "$LAST"
    fi  
    unset LAST
    unset LAST_CMD
    unset START
}

precmd.py

#!/usr/bin/python
import sys
import os
import time

START = float(sys.argv[1])
CMD = sys.argv[2]
CODE = sys.argv[3]
PWD = os.getcwd().replace("/Users/amitu", "~")
SHELL = os.environ["SHELL_ID"]
DURATION = time.time() - START

print('%0.3fs.' % DURATION)

DURATION = int(DURATION * 1000)

file("/Users/amitu/cmd.log", "a+").write(
    "%(START)s|%(SHELL)s|%(PWD)s|%(CODE)s|%(DURATION)s|%(CMD)s\n" % locals()
)