git-makezip

#!/usr/bin/env bash
#
# Create a ZIP archive of the current repo's master branch.
#
# @author Morgan Estes <morgan.estes@gmail.com>
readonly E_DID_NOTHING=0
readonly E_SUCCESS=1
readonly E_FAILURE=2

main() {
  if ! makezip; then
    err "There was a problem creating ${zip_filename}."
    exit "${E_DID_NOTHING}"
  else
    echo "Archive file ${zip_filename} created successfully."
    exit "${E_SUCCESS}"
  fi
}

#########################
# Creates a ZIP archive of the master branch at its current state.
#########################
makezip() {
  local is_branch_clean
  local current_branch
  local has_stash=false
  local success=false

  is_branch_clean="$(git status --porcelain)"
  current_branch="$(git rev-parse --abbrev-ref HEAD)"
  filename_base="$(git describe master)"
  zip_filename="${filename_base}.zip"

  if [[ -n "${is_branch_clean}" ]]; then
    has_stash=true
    echo 'Stashing changes...'
    git stash save -a -q
  fi

  # Switch to master, create the ZIP, then go back to where we were.
  switch_branch 'master'

  if create_archive; then
    success=true
  fi

  switch_branch "${current_branch}"

  if [ "${has_stash}" = true ]; then
    git stash apply
  fi

  if [ "${success}" = true ]; then
    return 0
  else
    return 1
  fi
}

switch_branch() {
  local branch="$1"

  git checkout "${branch}" -q
}

create_archive() {
  local success=false

  git archive master --prefix="${filename_base}/" --format=zip > "${zip_filename}"

  if [[ -e "${zip_filename}" ]]; then
    success=true
  fi

  if [ "${success}" = true ]; then
    return 0
  else
    return 1
  fi
}

err() {
    echo "[$(date +'%Y-%m-%dT%H:%M:%S%z')]: $@" >&2
}

main "$@"