autoupdate-zplug.plugin.zsh

# Copyright 2014-2015 Joe Block <jpb@unixorn.net>
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

_zplug-check-interval() {
  now=$(date +%s)
  if [ -f "${1}" ]; then
    last_update=$(cat "${1}")
  else
    last_update=0
  fi
  interval=$(expr ${now} - ${last_update})
  echo "${interval}"
}

_zplug-check-for-updates() {
  if [ -z "${ZPLUG_PLUGIN_UPDATE_DAYS}" ]; then
    ZPLUG_PLUGIN_UPDATE_DAYS=7
  fi

  if [ -z "${ZPLUG_PLUGIN_RECEIPT_F}" ]; then
    ZPLUG_PLUGIN_RECEIPT_F="${ZPLUG_HOME:-}/.zplug_plugin_lastupdate"
  fi

  local day_seconds=$(expr 24 \* 60 \* 60)
  local plugins_seconds=$(expr ${day_seconds} \* ${ZPLUG_PLUGIN_UPDATE_DAYS})

  local last_plugin=$(_zplug-check-interval ${ZPLUG_PLUGIN_RECEIPT_F})

  if [ ${last_plugin} -gt ${plugins_seconds} ]; then
    if [ ! -z "${ZPLUG_AUTOUPDATE_VERBOSE}" ]; then
      echo "It has been $(expr ${last_plugin} / $day_seconds) days since your zplug plugins were updated"
      echo "Updating plugins"
    fi
    zplug update

    date +%s >! ${ZPLUG_PLUGIN_RECEIPT_F}
    ## Use this time to clean out old plugins
    zplug clean --force
  fi
}

zmodload zsh/system
lockfile=${ZPLUG_HOME:-~}/.zplug_autoupdate_lock
touch $lockfile
if ! which zsystem &> /dev/null || zsystem flock -t 1 $lockfile; then
  _zplug-check-for-updates
  command rm -f $lockfile
fi