Bash Script to Update all Git Directories Below Current Directory or Specified Directory

update.sh

#!/bin/bash

# From ScalaCourses.com Introduction to Play Framework with Scala course

# Update all git directories below current directory or specified directory
# Skips directories that contain a file called .ignore
#
# Using printf insteach of echo -e for Mac OS
# See http://stackoverflow.com/questions/4435853/echo-outputs-e-parameter-in-bash-scripts-how-can-i-prevent-this

# Use ANSI colors if possible; see https://unix.stackexchange.com/a/10065/142869
# check if stdout is a terminal
if test -t 1; then
  # see if it supports colors
  ncolors=$(tput colors)
  if test -n "$ncolors" && test $ncolors -ge 8; then
    HIGHLIGHT="\e[01;34m"
    NORMAL='\e[00m'
  fi
fi

function update {
  local d="$1"
  if [ -d "$d" ]; then
    #echo "Looking for $d/.ignore"
    if [ -e "$d/.ignore" ]; then
      printf "%b\n" "\n${HIGHLIGHT}Ignoring $d${NORMAL}"
    else
      cd "$d" > /dev/null
      if [ -d ".git" ]; then
        printf "%b\n" "\n${HIGHLIGHT}Updating `pwd`$NORMAL"
        git pull
      elif [ ! -d .svn ] && [ ! -d CVS ]; then
        scan *
      fi
      cd .. > /dev/null
    fi
  fi
  #echo "Exiting update: pwd=`pwd`"
}

function scan {
  #echo "`pwd`"
  #echo "About to scan $*"
  for x in $*; do
    update "$x"
  done
}

function updater {
  if [ "$1" != "" ]; then cd "$1" > /dev/null; fi
  printf "%b\n" "${HIGHLIGHT}Scanning ${PWD}${NORMAL}"
  scan *
}

if [ "$1" == "" ]; then
  updater
else
  for dir in "$@"; do
    updater "$dir"
  done
fi