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ohmyzsh/tools/check_for_upgrade.sh

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#!/usr/bin/env zsh
zmodload zsh/datetime
function _current_epoch() {
echo $(( $EPOCHSECONDS / 60 / 60 / 24 ))
}
function _update_zsh_update() {
echo "LAST_EPOCH=$(_current_epoch)" >! ~/.zsh-update
}
function _upgrade_zsh() {
env ZSH=$ZSH sh $ZSH/tools/upgrade.sh
# update the zsh file
_update_zsh_update
}
epoch_target=$UPDATE_ZSH_DAYS
if [[ -z "$epoch_target" ]]; then
# Default to old behavior
epoch_target=13
fi
# Cancel upgrade if the current user doesn't have write permissions for the
# oh-my-zsh directory.
[[ -w "$ZSH" ]] || return 0
# Cancel upgrade if git is unavailable on the system
whence git >/dev/null || return 0
if mkdir "$ZSH/log/update.lock" 2>/dev/null; then
if [ -f ~/.zsh-update ]; then
. ~/.zsh-update
if [[ -z "$LAST_EPOCH" ]]; then
_update_zsh_update && return 0;
fi
epoch_diff=$(($(_current_epoch) - $LAST_EPOCH))
if [ $epoch_diff -gt $epoch_target ]; then
if [ "$DISABLE_UPDATE_PROMPT" = "true" ]; then
_upgrade_zsh
else
echo "[Oh My Zsh] Would you like to check for updates? [Y/n]: \c"
read line
if [[ "$line" == Y* ]] || [[ "$line" == y* ]] || [ -z "$line" ]; then
_upgrade_zsh
else
_update_zsh_update
fi
fi
fi
else
# create the zsh file
_update_zsh_update
fi
rmdir $ZSH/log/update.lock
fi