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Added license. Reimplemented Task (formerly Promise), TimeExt (formerly TimeIntervalFormatting), and Wait.

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50
autoload/Wait/Wait.gd Normal file
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extends Node
## Global reference point node for tick-based delays.
##
## Serves as a terser alternative to SceneTreeTimer.
signal _ticked(delay: float)
func _ready() -> void:
process_mode = Node.PROCESS_MODE_ALWAYS
func _process(delta: float) -> void:
_ticked.emit(delta)
## Waits one tick. Returns the tick's duration.
func tick() -> float:
return await _ticked
## Waits n ticks. Returns the total duration.
func ticks(n: int) -> float:
var duration: float = 0.0
for _dont_care in n:
duration += await _ticked
return duration
## Waits approximately n seconds. Returns the actual duration waited.
func seconds(n: float) -> float:
var duration: float = 0.0
while duration < n:
duration += await _ticked
return duration
## Waits until condition is fulfilled. Returns the duration waited.
func until(p: Callable) -> float:
var duration: float = 0.0
# Wrap condition in case it is a coroutine.
var task := Task.new(p)
while true:
# Wait for task, but do not actually await it,
# because we need to tally the time waited in the meantime.
while not task.is_finished():
duration += await _ticked
# Task is supposed to be a condition, not just any task.
# Therefore, even when it finishes, only conclude waiting
# if its result was affirmative (meaning the condition has been met);
# otherwise, repeat the task.
if task.result:
break
else:
task = Task.new(p)
return duration

4
project.godot
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@ -13,3 +13,7 @@ config_version=5
config/name="Stick the Quick" config/name="Stick the Quick"
config/features=PackedStringArray("4.3", "Forward Plus") config/features=PackedStringArray("4.3", "Forward Plus")
config/icon="res://icon.svg" config/icon="res://icon.svg"
[autoload]
Wait="*res://autoload/Wait/Wait.gd"

6
util/StrictSingleton.gd Normal file
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class_name StrictSingleton extends Object
## Base class for "strict" singletons which do not allow instantiation.
func _init() -> void:
push_error("Not instantiable")
free()

37
util/Task.gd Normal file
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@ -0,0 +1,37 @@
class_name Task extends RefCounted
## Promise-like abstraction for (hopefully) safer concurrency.
signal _sig_finished
## Value returned by task. Null if, but not only if, task has not finished.
var result: Variant = null
var _finished := false
## Awaits the given Callable concurrently and reports back when it finishes.
func _init(thunk: Callable) -> void:
var coro := func() -> void:
result = await thunk.call()
_finished = true
_sig_finished.emit()
coro.call()
## Returns true iff the task has finished.
func is_finished() -> bool:
return _finished
## Waits for the task to finish (if necessary) and returns its result.
func sync() -> Variant:
if not _finished:
await _sig_finished
return result
## Creates a Task which can only finish when all subtasks have finished.
##
## Returns an array of the tasks' results in the same respective order.
static func group(subtasks: Array[Task]) -> Task:
var thunk := func() -> Array:
var results := []
for task in subtasks:
results.push_back(await task.sync())
return results
return Task.new(thunk)

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util/TimeExt.gd Normal file
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class_name TimeExt extends StrictSingleton
## Extension methods for Time class.
## Returns the current number of seconds since the Epoch.
static func get_current_unix_time() -> int:
return Time.get_unix_time_from_datetime_dict(
Time.get_datetime_dict_from_system()
)
## Returns a string representation of the given number of system time seconds.
##
## Format is [minus] [N seconds|N minutes N seconds|N hours N minutes|N days].
## See function body comments for specific details.
static func format_systime_interval(seconds: int) -> String:
var neg: bool = seconds < 0
seconds = abs(seconds)
# If 0 minutes, report only seconds.
if seconds < 60:
return "%s%d seconds" % [
'minus ' if neg else '',
seconds
]
# If 0 hours, report only minutes and seconds.
elif seconds < 3600:
return "%s%d minutes %d seconds" % [
'minus ' if neg else '',
int(seconds/60.0), seconds%60
]
# If 0 days, report only hours and minutes, and regard seconds
# as probably too small in comparison to be of any interest.
elif seconds < 86400:
return "%s%d hours %02d minutes" % [
'minus ' if neg else '',
int(seconds/3600.0),
int(seconds/60.0)%60
]
# If >0 days, report only days, and regard everything else
# as probably too small in comparison to be of any interest.
else:
return "%s%d days" % [
'minus ' if neg else '',
int(seconds/86400.0)
]
## Returns a string representation of the given number of realtime seconds.
##
## Format is [-]HH:MM:SS:TT (where T stands for pars minuta [t]ertia,
## more commonly known as the typical duration of one frame).
static func format_realtime_interval(seconds: float) -> String:
var neg: bool = seconds < 0.0
seconds = abs(seconds)
return "%s%d:%02d:%02d:%02d" % [
'-' if neg else '',
int(seconds/3600.0),
int(seconds/60.0)%60,
int(seconds)%60,
int(seconds*60.0)%60
]