scripts/lib/helpers.sh

#!/bin/bash
#
# Copyright 2022 The Fuchsia Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

# Returns true if colors are supported.
function is-stderr-tty {
  [[ -t 2 ]]
}

# echo-info prints a line to stderr with a green INFO: prefix.
function echo-info {
  if is-stderr-tty; then
    echo -e >&2 "\033[1;32mINFO:\033[0m $*"
  else
    echo -e >&2 "INFO: $*"
  fi
}

# echo-warning prints a line to stderr with a yellow WARNING: prefix.
function echo-warning {
  if is-stderr-tty; then
    echo -e >&2 "\033[1;33mWARNING:\033[0m $*"
  else
    echo -e >&2 "WARNING: $*"
  fi
}

# echo-error prints a line to stderr with a red ERROR: prefix.
function echo-error {
  if is-stderr-tty; then
    echo -e >&2 "\033[1;31mERROR:\033[0m $*"
  else
    echo -e >&2 "ERROR: $*"
  fi
}

function ensure-embedder-dir {
  if [[ -z "${FUCHSIA_EMBEDDER_DIR}" ]]; then
    echo-error '$FUCHSIA_EMBEDDER_DIR must be set to your flutter-embedder folder before running this script.'
    echo-error 'Add this line to your shell profile:'
    echo-error "export FUCHSIA_EMBEDDER_DIR=$(cd "$(dirname "${BASH_SOURCE[0]}")" >/dev/null 2>&1 && cd .. && pwd)"
    exit 1
  fi
}

function ensure-engine-dir {
  if [[ -z "${ENGINE_DIR}" ]]; then
    echo-error '$ENGINE_DIR must be set to the src/ folder of your Flutter Engine checkout before running this script.'
    echo-error 'For example if your Flutter Engine checkout is $HOME/engine, add this line to your shell profile:'
    echo-error 'export ENGINE_DIR=$HOME/engine/src'
    exit 1
  fi
}

function ensure-ninja {
  if ! [ -x "$(command -v ninja)" ]; then
    echo-error '`ninja` is not in your $PATH. Do you have depot_tools installed and in your $PATH? https://commondatastorage.googleapis.com/chrome-infra-docs/flat/depot_tools/docs/html/depot_tools_tutorial.html#_setting_up'
    exit 1
  fi
}