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#!/bin/sh
[ "$skip_libraries" ] && return
export now="$(date +%s.%N)"
# load current state
mkdir -p "$POMODORO_STATE_PATH"
load_or_init() {
property="$1"
default_value="$2"
property_path="$POMODORO_STATE_PATH/current/$property"
if [ -f "$property_path" ] ; then
eval $property='"$(cat "$property_path")"'
else
eval $property='$default_value'
fi
}
[ -z "$lap" ] && load_or_init lap 0
[ -z "$state" ] && load_or_init state 'reset'
[ -z "$time" ] && load_or_init time 0.0
# save state (for diff)
diff_state() { printf '%s:' "$lap" "$state" "$time" ; }
original_state="$(diff_state)"
# allow overriding this value manually
[ -z "$update_time" ] && update_time=0
# calculate remaining time on timer
if [ -z "$remaining" ] ; then
remaining="$time"
[ "$state" = 'running' ] && remaining="$(echo "( $time - $now ) / 1" | bc)"
fi
# go to next lap if this timer expired
if [ "$state" = 'running' ] && [ "${remaining#-}" != "${remaining}" ] ; then
lap=$(( $lap + 1 ))
state='paused'
update_time=1
fi
# update remaining time if in reset
[ "$state" = 'reset' ] && update_time=1
[ "$time" = "0.0" ] && update_time=1
if [ $update_time -eq 1 ] ; then
# skip_libraries is used to prevent endless loop (see top of this file)
time=$(skip_libraries=y "$prog" lap $lap)
remaining=$time
fi
save_state() {
# do not save files if state didn't change
[ "$original_state" = "$(diff_state)" ] && return
# The state update needs to be atomic since other instances may access the
# state during an update. This is accomplished by replacing a single symlink,
# which should be atomic on most POSIX-compatible platforms, and is less
# complicated than a lockfile. $POMODORO_STATE_PATH contains three items:
#
# 1. current -- a symlink to `primary` or `secondary`
# 2. primary -- folder containing current state*
# 3. secondary -- temporary folder used write new state
#
# * `primary` will only contain stale state during an update (i.e. while
# `current` is pointing to `secondary`)
mkdir -p "$POMODORO_STATE_PATH/primary" "$POMODORO_STATE_PATH/secondary"
echo "$lap" > "$POMODORO_STATE_PATH/secondary/lap"
echo "$state" > "$POMODORO_STATE_PATH/secondary/state"
echo "$time" > "$POMODORO_STATE_PATH/secondary/time"
ln -sf "secondary" "$POMODORO_STATE_PATH/secondary/current"
# this is the atomic update that replaces the `current` symlink with the new
# state
mv "$POMODORO_STATE_PATH/secondary/current" "$POMODORO_STATE_PATH"
# next, replace the old `primary` state with the new state from `secondary`,
# and update the symlink a second time to now point to `primary` again (this
# does not change the state)
cp -r "$POMODORO_STATE_PATH/secondary/." "$POMODORO_STATE_PATH/primary/"
ln -sf "primary" "$POMODORO_STATE_PATH/primary/current"
mv "$POMODORO_STATE_PATH/primary/current" "$POMODORO_STATE_PATH"
}
# state variables
export lap state time
# calculated variables
export remaining
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