git-move-files-with-history.sh

#!/bin/bash
# git-mv-with-history -- move/rename file or folder, with history.
# https://git.wiki.kernel.org/index.php/GitFaq#Why_does_Git_not_.22track.22_renames.3F

function usage() {
  echo "How to use it: `basename $0` [-d/--dry-run] [-v/--verbose] <srcname>=<destname> <...> <...>"
  [ -z "$1" ] || echo $1

  exit 1
}

[ ! -d .git ] && usage "ERROR : No git dir found. Bye."

dryrun=0
filter=""
verbose=""
repo=$(basename `git rev-parse --show-toplevel`)

while [[ $1 =~ ^\- ]]; do
  case $1 in
    -d|--dry-run)
      dryrun=1
      ;;

    -v|--verbose)
      verbose="-v"
      ;;

    *)
      usage "Invalid argument: $1"
  esac

  shift
done

for arg in $@; do
  val=`echo $arg | grep -q '=' && echo 1 || echo 0`
  src=`echo $arg | sed 's/\(.*\)=\(.*\)/\1/'`
  dst=`echo $arg | sed 's/\(.*\)=\(.*\)/\2/'`
  dir=`echo $dst | grep -q '/$' && echo $dst || dirname $dst`

  [ "$val" -ne 1  ] && usage
  [ ! -e "$src"   ] && usage "error: $src does not exist"

  filter="$filter                            \n\
    if [ -e \"$src\" ]; then                 \n\
      echo                                   \n\
      if [ ! -e \"$dir\" ]; then             \n\
        mkdir -p ${verbose} \"$dir\" && echo \n\
      fi                                     \n\
      mv $verbose \"$src\" \"$dst\"          \n\
    fi                                       \n\
  "
done

[ -z "$filter" ] && usage

if [[ $dryrun -eq 1 || ! -z $verbose ]]; then
  echo
  echo "tree-filter to execute against $repo:"
  echo -e "$filter"
fi

[ $dryrun -eq 0 ] && git filter-branch -f --tree-filter "`echo -e $filter`"