# Copyright 2019 The Go Authors. All rights reserved.
# Use of this source code is governed by a BSD-style
# license that can be found in the LICENSE file.

# Library of useful bash functions and variables.

if [ -t 1 ] && which tput >/dev/null 2>&1; then
  RED="$(tput setaf 1)"
  GREEN="$(tput setaf 2)"
  YELLOW="$(tput setaf 3)"
  NORMAL="$(tput sgr0)"
else
  RED=""
  GREEN=""
  YELLOW=""
  NORMAL=""
fi

EXIT_CODE=0

info() { echo -e "${GREEN}$@${NORMAL}" 1>&2; }
warn() { echo -e "${YELLOW}$@${NORMAL}" 1>&2; }
err() { echo -e "${RED}$@${NORMAL}" 1>&2; EXIT_CODE=1; }

die() {
  err $@
  exit 1
}

# runcmd prints an info log describing the command that is about to be run, and
# then runs it. It sets EXIT_CODE to non-zero if the command fails, but does not exit
# the script.
runcmd() {
  msg="$@"
  # Truncate command logging for narrow terminals.
  # Account for the 2 characters of '$ '.
  maxwidth=$(( $(tput cols) - 2 ))
  if [[ ${#msg} -gt $maxwidth ]]; then
    msg="${msg::$(( maxwidth - 3 ))}..."
  fi
  info "\$ $msg"
  $@ || err "command failed"
}