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prezto/tools/check_for_upgrade.sh

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#!/bin/sh
current_epoch=$(($(date +%s) / 60 / 60 / 24))
if [ -f ~/.zsh-update ]
then
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. ~/.zsh-update
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epoch_diff=$(($current_epoch - $LAST_EPOCH))
if [ $epoch_diff -gt 6 ]
then
echo "[Oh My Zsh] Would you like to check for updates?"
echo "Type Y to update oh-my-zsh: \c"
read line
if [ "$line" = Y ] || [ "$line" = y ]
then
/bin/sh $ZSH/tools/upgrade.sh
fi
# Set the last epoch to the current so that we don't ask for another week
echo "LAST_EPOCH=${current_epoch}" > ~/.zsh-update
fi
else
# TODO: refactor this so remove duplicates
# Create the ~/.zsh-update file with the current epoch info
echo "LAST_EPOCH=${current_epoch}" > ~/.zsh-update
fi