Git: Auto-Generated Binary Synchronization: Zap unmodified binary files

git-checkout-unmodified-binaries

#!/usr/bin/env bash

# This is a Git tool which zaps-auto-generated-binaries, which have not
# been modified from the previous version.

# This tool is designed to help keep commit history clean and concise.

GITROOT="`realpath $1`"; shift;

MD5FILES="$@";

MD5CACHE=${GITROOT}/MD5;

md5.cache() { md5sum -b $MD5FILES > $MD5CACHE; }
md5.unmodified.files() { md5sum -c $MD5CACHE | grep OK | cut -d: -f1; }

git.modified.files() { git ls-files -m; }

params.contains() {
    match="$1"; shift;
    for arg; do [[ "$match" == "$arg" ]] && echo $arg; done;
}

filter.matches() {
  while read line; do
    params.contains "$line" "$@";
  done;
}

(
 cd $GITROOT;
 [[ -e "$MD5CACHE" ]] && {
   FILES=$(git.modified.files | filter.matches $(md5.unmodified.files))
   [[ -n "$FILES" ]] && git checkout $FILES;
 }
 md5.cache;
)