dotfiles/check_for_update.zsh

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#!/usr/bin/env zsh
# brethil, brutally copied from https://github.com/robbyrussell/oh-my-zsh/blob/master/tools/check_for_upgrade.sh
# This also runs antibody update"
# First version: 14 July 2017
# Rebased on upstream: 08 December 2020
local DOTFILES_UPDATEFILE=${DOTFILES}/.dotfiles-update
# Migrate .dotfiles-update file to $DOTFILES
if [[ -f ~/.dotfiles-update && ! -f "${DOTFILES_UPDATEFILE}" ]]; then
mv ~/.dotfiles-update "${DOTFILES_UPDATEFILE}"
fi
# Cancel update if:
# - the automatic update is disabled.
# - git is unavailable on the system.
if [[ "$DISABLE_DOTFILES_AUTOUPDATE" = true ]] || ! command -v git &>/dev/null; then
return
fi
function current_epoch() {
zmodload zsh/datetime
echo $(( EPOCHSECONDS / 60 / 60 / 24 ))
}
function _update_dotfiles_update() {
echo "LAST_EPOCH=$(current_epoch)" >! "${DOTFILES_UPDATEFILE}"
}
function update_dotfiles() {
(cd $DOTFILES; git pull -q --rebase && echo "Succesfully upgraded dotfiles" || echo "Could not upgrade dotfiles.")
antibody update
vim -c 'PlugUpdate|PlugClean|qa!'
# update the zsh file
_update_dotfiles_update
}
() {
emulate -L zsh
local epoch_target mtime option LAST_EPOCH
# Remove lock directory if older than a day
zmodload zsh/datetime
zmodload -F zsh/stat b:zstat
if mtime=$(zstat +mtime "$DOTFILES/update.lock" 2>/dev/null); then
if (( (mtime + 3600 * 24) < EPOCHSECONDS )); then
command rm -rf "$DOTFILES/update.lock"
fi
fi
# Check for lock directory
if ! command mkdir "$DOTFILES/update.lock" 2>/dev/null; then
return
fi
# Remove lock directory on exit. `return 1` is important for when trapping a SIGINT:
# The return status from the function is handled specially. If it is zero, the signal is
# assumed to have been handled, and execution continues normally. Otherwise, the shell
# will behave as interrupted except that the return status of the trap is retained.
trap "
unset -f current_epoch _update_dotfiles_update update_dotfiles
command rm -rf '$DOTFILES/update.lock'
return 1
" EXIT INT QUIT
# Create or update .zsh-update file if missing or malformed
if ! source "${DOTFILES_UPDATEFILE}" 2>/dev/null || [[ -z "$LAST_EPOCH" ]]; then
_update_dotfiles_update
return
fi
# Number of days before trying to update again
epoch_target=${UPDATE_DOTFILES_DAYS:-5}
# Test if enough time has passed until the next update
if (( ( $(current_epoch) - $LAST_EPOCH ) < $epoch_target )); then
return
fi
# Ask for confirmation before updating unless disabled
if [[ "$DISABLE_UPDATE_PROMPT" = true ]]; then
update_dotfiles
else
# input sink to swallow all characters typed before the prompt
# and add a newline if there wasn't one after characters typed
while read -t -k 1 option; do true; done
[[ "$option" != ($'\n'|"") ]] && echo
echo -n "[brethil-dotfiles] Would you like to update? [Y/n] "
read -r -k 1 option
[[ "$option" != $'\n' ]] && echo
case "$option" in
[yY$'\n']) update_dotfiles ;;
[nN]) _update_dotfiles_update ;;
esac
fi
}