generate-git-patch.sh

###############################################################################
# generateOutputFilename
#
# Get a unique timestamped filename with the date, git hash, and branch to
# patch. The stanza is <userPrefix>-date-hash-for-<branch>.patch
#
# NOTE: Date formate is ddmmyy_hhmmss in 24hr format
# NOTE: Git hash is the last 7 chars
###############################################################################
function generateOutputFilename {
  logD "[generateOutputFilename]"

  cd "$REPO_DIR"
  # Get the date formatted in daymonthyear_hhmmss
  local date="$(date +%d%m%y_%H%M%S)"
  local gitHash="$(git rev-parse --short HEAD)"

  logD "[generateOutputFilename] Date, %d%m%y_%H%M%S: $date"
  logD "[generateOutputFilename] Git Hash, git rev-parse --short HEAD: $gitHash"

  if [ -n "$PATCH_FILE" ]; then
    OUT_FILE="$PATCH_FILE-$date-$gitHash-for-$BRANCH_TO_PATCH.patch"
  else
    OUT_FILE="$date-$gitHash-for-$BRANCH_TO_PATCH.patch"
  fi
}

###############################################################################
# createGitPatch
#
# Generates a git patch where all the commits are in one file rather
# than individual files for each commit.
###############################################################################
function createGitPatch {
  logD "[createGitPatch]"
  cd "$REPO_DIR"
  git format-patch $BRANCH_TO_PATCH --stdout > "$OUT_DIR/$OUT_FILE"
  cd "$ABS_SCRIPT_PATH"
}