commit 4b73cd93bf14c85bf602169cc9a004af0d6b3676
Author: Manuel Vögele <develop@manuel-voegele.de>
Date:   Mon Feb 1 13:17:23 2021 +0100

    Initial commit

diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 0000000..35c5fb2
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,7 @@
+root = true
+
+[*]
+end_of_line = lf
+indent_style = tab
+insert_final_newline = true
+trim_trailing_whitespace = true
diff --git a/lang/en.json b/lang/en.json
new file mode 100644
index 0000000..5f0f6fc
--- /dev/null
+++ b/lang/en.json
@@ -0,0 +1,23 @@
+{
+	"drag-ruler": {
+		"settings": {
+			"dashMultiplier": {
+				"name": "Dash Multiplier",
+				"hint": "This can be used to give tokens a secondary speed during coloring of the measured path. Set it to 0 to disable the secondary speed."
+			},
+			"speedAttribute": {
+				"name": "Speed Attribute",
+				"hint": "The attribute that defines a token's walking speed. This is used during coloring of the measured path."
+			},
+			"speedProvider": {
+				"name": "Speed Settings Provider",
+				"hint": "Select who provides speed information for tokens duing coloring. Using a game system or module may provide more flexible coloring than sticking to the options provided by Drag Ruler.",
+				"choices": {
+					"module": "Module",
+					"native": "Drag Ruler",
+					"system": "System"
+				}
+			}
+		}
+	}
+}
diff --git a/module.json b/module.json
new file mode 100644
index 0000000..ada8fae
--- /dev/null
+++ b/module.json
@@ -0,0 +1,30 @@
+{
+	"name": "drag-ruler",
+	"title": "Drag Ruler",
+	"description": "When dragging a token displays a ruler showing how far you've moved that token.",
+	"version": "0.0.1",
+	"minimumCoreVersion" : "0.7.9",
+	"compatibleCoreVersion" : "0.7.9",
+	"authors": [
+		{
+			"name": "Manuel Vögele",
+			"email": "develop@manuel-voegele.de",
+			"discord": "Stäbchenfisch#5107"
+		}
+	],
+	"esmodules": [
+		"src/main.js"
+	],
+	"languages": [
+		{
+			"lang": "en",
+			"name": "English",
+			"path": "lang/en.json"
+		}
+	],
+	"url": "https://github.com/manuelVo/foundryvtt-drag-ruler",
+	"download": "https://github.com/manuelVo/foundryvtt-drag-ruler/archive/master.zip",
+	"manifest": "https://raw.githubusercontent.com/manuelVo/foundryvtt-drag-ruler/master/module.json",
+	"readme": "https://github.com/manuelVo/foundryvtt-drag-ruler/blob/master/README.md",
+	"bugs": "https://github.com/manuelVo/foundryvtt-drag-ruler/issues"
+}
diff --git a/src/api.js b/src/api.js
new file mode 100644
index 0000000..0d1a8d1
--- /dev/null
+++ b/src/api.js
@@ -0,0 +1,85 @@
+export const availableSpeedProviders = {}
+export let currentSpeedProvider = undefined
+
+function register(module, type, speedProvider) {
+	const providerSetting = game.settings.settings.get("drag-ruler.speedProvider")
+
+	// Add the registered module to the settings entry
+	providerSetting.config = true
+	const moduleName = module.data.title
+	const typeTitle = game.i18n.localize(`drag-ruler.settings.speedProvider.choices.${type}`)
+	providerSetting.choices[`${type}.${module.id}`] = `${typeTitle} ${moduleName}`
+	availableSpeedProviders[`${type}.${module.id}`] = speedProvider
+	providerSetting.default = getDefaultSpeedProvider()
+
+	updateSpeedProvider()
+}
+
+function getDefaultSpeedProvider() {
+	const providerSetting = game.settings.settings.get("drag-ruler.speedProvider")
+	const settingKeys = Object.keys(providerSetting.choices)
+	// Game systems take the highest precedence for the being the default
+	const gameSystem = settingKeys.find(key => key.startsWith("system."))
+	if (gameSystem)
+		return gameSystem
+
+	// If no game system is registered modules are next up.
+	// For lack of a method to select the best module we're just falling back to taking the next best module
+	// settingKeys should always be sorted the same way so this should achive a stable default
+	const module = settingKeys.find(key => key.startsWith("module."))
+	if (module)
+		return module
+
+	// If neither a game system or a module is found fall back to the native implementation
+	return settingKeys[0]
+}
+
+export function updateSpeedProvider() {
+	// If the configured provider is registered use that one. If not use the default provider
+	const configuredProvider = game.settings.get("drag-ruler", "speedProvider")
+	currentSpeedProvider = availableSpeedProviders[configuredProvider] ?? availableSpeedProviders[game.settings.settings.get("drag-ruler.speedProvider").default]
+}
+
+export function setCurrentSpeedProvider(newSpeedProvider) {
+	currentSpeedProvider = newSpeedProvider
+}
+
+export function registerModule(moduleId, speedProvider) {
+	// Check if a module with the given id exists and is currently enabled
+	const module = game.modules.get(moduleId)
+	// If it doesn't the calling module did something wrong. Log a warning and ignore this module
+	if (!module) {
+		console.warn(
+			`Drag Ruler | A module tried to register with the id "${moduleId}". However no active module with this id was found.` +
+			"This api registration call was ignored. " +
+			"If you are the author of that module please check that the id passed to `registerModule` matches the id in your manifest exactly." +
+			"If this call was made form a game system instead of a module please use `registerSystem` instead.")
+		return
+	}
+	// Using Drag Ruler's id is not allowed
+	if (moduleId === "drag-ruler") {
+		console.warn(
+			`Drag Ruler | A module tried to register with the id "${moduleId}", which is not allowed. This api registration call was ignored. ` +
+			"If you're the author of the module please use the id of your own module as it's specified in your manifest to register to this api. " +
+			"If this call was made form a game system instead of a module please use `registerSystem` instead."
+		)
+		return
+	}
+
+	register(module, "module", speedProvider)
+}
+
+export function registerSystem(systemId, speedProvider) {
+	const system = game.system
+	// If the current system id doesn't match the provided id something went wrong. Log a warning and ignore this module
+	if (system.id != systemId) {
+		console.warn(
+			`Drag Ruler | A system tried to register with the id "${systemId}". However the active system has a different id.` +
+			"This api registration call was ignored. " +
+			"If you are the author of that system please check that the id passed to `registerSystem` matches the id in your manifest exactly." +
+			"If this call was made form a module instead of a game system please use `registerModule` instead.")
+		return
+	}
+
+	register(system, "system", speedProvider)
+}
diff --git a/src/main.js b/src/main.js
new file mode 100644
index 0000000..75fe4db
--- /dev/null
+++ b/src/main.js
@@ -0,0 +1,178 @@
+"use strict"
+
+import {availableSpeedProviders, currentSpeedProvider, registerModule, registerSystem, setCurrentSpeedProvider} from "./api.js"
+import {registerSettings, settingsKey} from "./settings.js"
+
+Hooks.once("init", () => {
+	registerSettings()
+	hookTokenDragHandlers()
+	hookRulerHandlers()
+	patchRulerMeasure()
+	patchRulerHighlightMeasurement()
+
+	availableSpeedProviders["native"] = nativeSpeedProvider
+	setCurrentSpeedProvider(nativeSpeedProvider)
+
+	window.dragRuler = {
+		getColorForDistance,
+		registerModule,
+		registerSystem
+	}
+
+})
+
+Hooks.once("ready", () => {
+	Hooks.callAll("dragRuler.ready")
+})
+
+Hooks.on("canvasReady", () => {
+	canvas.controls.ruler.draggedToken = null
+	Object.defineProperty(canvas.controls.ruler, "isDragRuler", {
+		get: function isDragRuler() {
+			return Boolean(this.draggedToken) // If draggedToken is set this is a drag ruler
+		}
+	})
+})
+
+function hookTokenDragHandlers() {
+	const originalDragLeftStartHandler = Token.prototype._onDragLeftStart
+	Token.prototype._onDragLeftStart = function(event) {
+		originalDragLeftStartHandler.call(this, event)
+		onTokenLeftDragStart.call(this, event)
+	}
+
+	const originalDragLeftMoveHandler = Token.prototype._onDragLeftMove
+	Token.prototype._onDragLeftMove = function (event) {
+		originalDragLeftMoveHandler.call(this, event)
+		onTokenLeftDragMove.call(this, event)
+	}
+
+	const originalDragLeftDropHandler = Token.prototype._onDragLeftDrop
+	Token.prototype._onDragLeftDrop = function (event) {
+		const eventHandled = onTokenDragLeftDrop.call(this, event)
+		if (!eventHandled)
+			originalDragLeftDropHandler.call(this, event)
+	}
+
+	const originalDragLeftCancelHandler = Token.prototype._onDragLeftCancel
+	Token.prototype._onDragLeftCancel = function (event) {
+		const eventHandled = onTokenDragLeftCancel.call(this, event)
+		if (!eventHandled)
+			originalDragLeftCancelHandler.call(this, event)
+	}
+}
+
+function hookRulerHandlers() {
+	const originalMoveTokenHandler = Ruler.prototype.moveToken
+	Ruler.prototype.moveToken = function (event) {
+		const eventHandled = onRulerMoveToken.call(this, event)
+		if (!eventHandled)
+			return originalMoveTokenHandler.call(this, event)
+		return true
+	}
+}
+
+function onTokenLeftDragStart(event) {
+	canvas.controls.ruler._onDragStart(event)
+	canvas.controls.ruler.draggedToken = this
+}
+
+function onTokenLeftDragMove(event) {
+	if (canvas.controls.ruler.isDragRuler)
+		canvas.controls.ruler._onMouseMove(event)
+}
+
+function onTokenDragLeftDrop(event) {
+	if (!canvas.controls.ruler.isDragRuler)
+		return false
+	canvas.controls.ruler.draggedToken = null
+	canvas.controls.ruler.moveToken(event)
+	return true
+}
+
+function onTokenDragLeftCancel(event) {
+	if (!canvas.controls.ruler.isDragRuler)
+		return false
+	if (canvas.controls.ruler._state === Ruler.STATES.MEASURING) {
+		if (canvas.controls.ruler.waypoints.length > 1) {
+			canvas.controls.ruler._removeWaypoint(canvas.app.renderer.plugins.interaction.mouse.getLocalPosition(canvas.tokens), {snap: !event.shiftKey})
+			game.user.broadcastActivity({ruler: canvas.controls.ruler})
+			event.preventDefault()
+		}
+		else {
+			canvas.controls.ruler._endMeasurement()
+			canvas.controls.ruler.draggedToken = null
+			return false
+		}
+	}
+	return true
+}
+
+function onRulerMoveToken(event) {
+	if (!this.isDragRuler)
+		return false
+	this._addWaypoint(this.destination)
+	return true
+}
+
+function strInsertAfter(haystack, needle, strToInsert) {
+	const pos = haystack.indexOf(needle) + needle.length
+	return haystack.slice(0, pos) + strToInsert + haystack.slice(pos)
+}
+
+// These patches were written with foundry-0.7.9.js as reference
+function patchRulerMeasure() {
+	let code = Ruler.prototype.measure.toString()
+	// Remove function signature and closing curly bracket (those are on the first and last line)
+	code = code.slice(code.indexOf("\n"), code.lastIndexOf("\n"))
+	code = strInsertAfter(code, "for ( let [i, d] of distances.entries() ) {\n", "segments[i].startDistance = totalDistance\n")
+	code = strInsertAfter(code, "this._highlightMeasurement(ray", ", s.startDistance")
+	Ruler.prototype.measure = new Function("destination", "{gridSpaces=true}={}", code)
+}
+
+function nativeSpeedProvider(token, playercolor) {
+	const speedAttribute = game.settings.get(settingsKey, "speedAttribute")
+	if (!speedAttribute)
+		return []
+	const tokenSpeed = getProperty(token, speedAttribute)
+	if (tokenSpeed === undefined) {
+		console.warn(`Drag Ruler | The configured token speed attribute "${speedAttribute}" didn't return a speed value. To use colors based on drag distance set the setting to the correct value (or clear the box to disable this feature).`)
+		return []
+	}
+	const dashMultiplier = game.settings.get(settingsKey, "dashMultiplier")
+	if (!dashMultiplier)
+		return [{range: tokenSpeed, color: playercolor}]
+	return [{range: tokenSpeed, color: playercolor}, {range: tokenSpeed * dashMultiplier, color: 0xFFFF00}]
+}
+
+function getColorForDistance(startDistance, subDistance) {
+	if (!this.isDragRuler)
+		return this.color
+	const distance = startDistance + subDistance
+	const ranges = currentSpeedProvider(this.draggedToken, this.color)
+	if (ranges.length === 0)
+		return this.color
+	const currentRange = ranges.reduce((minRange, currentRange) => {
+		if (distance <= currentRange.range && currentRange.range < minRange.range)
+			return currentRange
+		return minRange
+	}, {range: Infinity, color: 0xFF0000})
+	return currentRange.color
+}
+
+// These patches were written with foundry-0.7.9.js as reference
+function patchRulerHighlightMeasurement() {
+	let code = Ruler.prototype._highlightMeasurement.toString()
+	// Remove function signature and closing curly bracket (those are on the first and last line)
+	code = code.slice(code.indexOf("\n"), code.lastIndexOf("\n"))
+
+	const calcColorCode = `
+		let subDistance = canvas.grid.measureDistances([{ray: new Ray(ray.A, {x: xg, y: yg})}], {gridSpaces: true})[0]
+		let color = dragRuler.getColorForDistance.call(this, startDistance, subDistance)
+	`
+
+	code = strInsertAfter(code, "Position(x1, y1);\n", calcColorCode)
+	code = strInsertAfter(code, "Position(x1h, y1h);\n", calcColorCode.replace("x: xg, y: yg", "x: xgh, y: ygh"))
+	code = code.replace(/color: this\.color\}/g, "color}")
+	Ruler.prototype._highlightMeasurement = new Function("ray", "startDistance=undefined", code)
+}
diff --git a/src/settings.js b/src/settings.js
new file mode 100644
index 0000000..8ef52f9
--- /dev/null
+++ b/src/settings.js
@@ -0,0 +1,38 @@
+import {updateSpeedProvider} from "./api.js";
+import {getDefaultDashMultiplier, getDefaultSpeedAttribute} from "./systems.js"
+
+export const settingsKey = "drag-ruler";
+
+export function registerSettings() {
+	// This setting will be modified by the api if modules register to it
+	game.settings.register(settingsKey, "speedProvider", {
+		name: "drag-ruler.settings.speedProvider.name",
+		hint: "drag-ruler.settings.speedProvider.hint",
+		scope: "world",
+		config: false,
+		type: Object,
+		choices: {
+			"native": game.i18n.localize("drag-ruler.settings.speedProvider.choices.native")
+		},
+		default: "native",
+		onChange: updateSpeedProvider,
+	})
+
+	game.settings.register(settingsKey, "speedAttribute", {
+		name: "drag-ruler.settings.speedAttribute.name",
+		hint: "drag-ruler.settings.speedAttribute.hint",
+		scope: "world",
+		config: true,
+		type: String,
+		default: getDefaultSpeedAttribute(),
+	})
+
+	game.settings.register(settingsKey, "dashMultiplier", {
+		name: "drag-ruler.settings.dashMultiplier.name",
+		hint: "drag-ruler.settings.dashMultiplier.hint",
+		scope: "world",
+		config: true,
+		type: Number,
+		default: getDefaultDashMultiplier(),
+	})
+}
diff --git a/src/systems.js b/src/systems.js
new file mode 100644
index 0000000..fa93ea7
--- /dev/null
+++ b/src/systems.js
@@ -0,0 +1,19 @@
+
+export function getDefaultSpeedAttribute() {
+	switch (game.system.id) {
+		case "dnd5e":
+			return "actor.data.data.attributes.movement.walk"
+		case "pf1":
+			return "actor.data.data.attributes.speed.land.total"
+	}
+	return ""
+}
+
+export function getDefaultDashMultiplier() {
+	switch (game.system.id) {
+		case "dnd5e":
+		case "pf1":
+			return 2
+	}
+	return 0
+}