Add 05-ping example

lua/examples/05-ping/README.md

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+# pdportal-05-ping
+
+How fast is this thing, anyway?
+
+## Installation
+
+`./build.sh d` will compile and automatically install the app to your connected Playdate. I'm sorry, the script currently only works on macOS, and even then can be a bit janky. Pull requests welcome :)

lua/examples/05-ping/build.sh

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+pdxFile="pdportal-05-ping.pdx"
+
+cp ../../pdportal.lua ./src/pdportal.lua
+pdc src "$pdxFile"
+
+runChoice=$1
+
+if [ "$runChoice" = "s" ]; then
+	open "$pdxFile"
+elif [ "$runChoice" = "d" ]; then
+	node ../../../scripts/uploadPdxToPlaydate.js "$pdxFile"
+fi

lua/examples/05-ping/src/Example05Ping.lua

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+local graphics <const> = playdate.graphics
+
+local PdPortal <const> = PdPortal
+local PortalCommand <const> = PdPortal.PortalCommand
+
+class('Example05Ping').extends(PdPortal)
+local Example05Ping <const> = Example05Ping
+
+function Example05Ping:init()
+	-- If your subclass overrides the init method, make sure to call super!
+	Example05Ping.super.init(self)
+
+	playdate.display.setRefreshRate(50)
+
+	self:_initOwnProps()
+end
+
+function Example05Ping:_initOwnProps()
+	self.connected = false
+	self.isPinging = false
+	self.pingDuration = -1
+	self.pingStart = -1
+	self.peerId = nil
+	self.remotePeerId = nil
+end
+
+function Example05Ping:update()
+	-- If your subclass overrides the update method, make sure to call super!
+	Example05Ping.super.update(self)
+
+	graphics.clear()
+
+	playdate.drawFPS(10, 225)
+
+	if self.connected then
+		if self.isPinging then
+			graphics.drawTextAligned(
+				'Pinging…',
+				200,
+				100,
+				kTextAlignment.center
+			)
+		elseif self.peerId == nil then
+			graphics.drawTextAligned(
+				'Connecting to peer server…',
+				200,
+				100,
+				kTextAlignment.center
+			)
+		elseif self.remotePeerId == nil then
+			graphics.drawTextAligned(
+				'Connected as ' .. self.peerId ..', waiting for remote peer…',
+				200,
+				100,
+				kTextAlignment.center
+			)
+		elseif self.pingDuration > -1 then
+			graphics.drawTextAligned(
+				'Pong in ' .. self.pingDuration * 1000 ..'ms (Ⓐ ping again)',
+				200,
+				100,
+				kTextAlignment.center
+			)
+
+			if playdate.buttonJustPressed(playdate.kButtonA) then
+				self:beginPing()
+			end
+		else
+			graphics.drawTextAligned(
+				'Ⓐ to ping',
+				200,
+				100,
+				kTextAlignment.center
+			)
+
+			if playdate.buttonJustPressed(playdate.kButtonA) then
+				self:beginPing()
+			end
+		end
+	else
+		graphics.drawTextAligned(
+			'Disconnected',
+			200,
+			100,
+			kTextAlignment.center
+		)
+	end
+end
+
+function Example05Ping:beginPing()
+	self.pingStart = playdate.getElapsedTime()
+	self:sendToPeerConn(self.remotePeerId, 'ping')
+end
+
+function Example05Ping:onConnect(portalVersion)
+	self.connected = true
+	self:sendCommand(PortalCommand.InitializePeer)
+end
+
+function Example05Ping:onPeerOpen(peerId)
+	self.peerId = peerId
+end
+
+function Example05Ping:onPeerConnection(remotePeerId)
+	self.remotePeerId = remotePeerId
+end
+
+function Example05Ping:onPeerConnOpen(remotePeerId)
+	self.remotePeerId = remotePeerId
+end
+
+function Example05Ping:onDisconnect()
+	self:_initOwnProps()
+end
+
+function Example05Ping:onPeerConnData(remotePeerId, payload)
+	-- Note double quotes below because of peerjs JSON encoding. Typically, you'd just send an actual JSON object instead of a string
+	if payload == '"ping"' then
+		self:sendToPeerConn(self.remotePeerId, 'pong')
+	elseif payload == '"pong"' then
+		self.isPinging = false
+		self.pingDuration = playdate.getElapsedTime() - self.pingStart
+	end
+end

lua/examples/05-ping/src/main.lua

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+-- Copied during build, you wouldn't normally have to do that
+import './pdportal'
+
+import 'CoreLibs/graphics'
+
+import 'Example05Ping'
+
+local app = Example05Ping()
+
+playdate.update = function()
+	app:update()
+end

lua/examples/05-ping/src/pdxinfo

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+name=pdportal-05-ping
+bundleID=com.strawdynamics.pdportal-05-ping
+version=0.2.0
+buildNumber=1