oh-my-zsh/tools/check_for_upgrade.sh

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#!/bin/sh
function _current_epoch() {
echo $(($(date +%s) / 60 / 60 / 24))
}
function _update_zsh_update() {
echo "LAST_EPOCH=$(_current_epoch)" > ~/.zsh-update
}
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function _upgrade_zsh() {
/usr/bin/env ZSH=$ZSH /bin/sh $ZSH/tools/upgrade.sh
# update the zsh file
_update_zsh_update
}
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if [ -f ~/.zsh-update ]
then
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. ~/.zsh-update
if [[ -z "$LAST_EPOCH" ]]; then
_update_zsh_update && return 0;
fi
epoch_diff=$(($(_current_epoch) - $LAST_EPOCH))
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if [ $epoch_diff -gt 6 ]
then
if [ "$DISABLE_UPDATE_PROMPT" = "true" ]
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then
_upgrade_zsh
else
echo "[Oh My Zsh] Would you like to check for updates?"
echo "Type Y to update oh-my-zsh: \c"
read line
if [ "$line" = Y ] || [ "$line" = y ]
then
_upgrade_zsh
fi
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fi
fi
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else
# create the zsh file
_update_zsh_update
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fi