support LÖVE v12

In LÖVE v12 you no longer need to run it through the unfurl.lua shim,
and you can now open new threads by pasting their links into the app
using `ctrl+v`.

0012-on.initialize

@@ -1,15 +1,28 @@
 on.initialize = function(arg)
-	if #arg == 0 then
-		error('Please pass in a file containing a Mastodon thread, and optionally an id within it to start out focused on.\n\nThis app currently needs to be invoked from a terminal.')
-	end
-	Input_filename = arg[1]
-	A()
-	Cursor_node = Root
-	if #arg >= 2 then
-		local initial_id = arg[2]
-		if Nodes[initial_id] then
-			Cursor_node = Nodes[initial_id]
+	if Major_version >= 12 then
+		-- LÖVE has https
+		-- commandline arg is a url
+		if #arg > 0 then
+			Url = arg[1]
+			A()
 		end
+	else
+		-- LÖVE pre-v12 doesn't have https
+		-- we depend on an external shim to download
+		-- commandline arg is a filename
+		if #arg == 0 then
+			-- no ability to load new URL
+			error('When running with LÖVE v11, please pass in a file containing a Mastodon thread, and optionally an id within it to start out focused on.\n\nThis app currently needs to be invoked from a terminal.')
+		end
+		Input_filename = arg[1]
+		A()
+		Cursor_node = Root
+		if #arg >= 2 then
+			local initial_id = arg[2]
+			if Nodes[initial_id] then
+				Cursor_node = Nodes[initial_id]
+			end
+		end
+		ensure_cursor_node_within_viewport()
 	end
-	ensure_cursor_node_within_viewport()
 end

0023-on.keychord_press

@@ -11,6 +11,22 @@ on.keychord_press = function(chord, key)
 		-- reset zoom
 		Viewport.zoom = 1.0
 		B()
+	elseif chord == 'C-v' then
+		-- load new URL
+		if Major_version >= 12 then  -- requires LÖVE with https
+			-- ignore stuff in the clipboard that doesn't look like a url
+			local cb = App.get_clipboard()
+			if #cb > 300 then
+				print('clipboard: '..cb:sub(1,300)..'...')
+			else
+				print('clipboard: '..cb)
+			end
+			if cb:match('^%s*https://[^%s]*%s*$') then
+				print('clipboard contains a URL')
+				Url = trim(cb)
+				A()
+			end
+		end
 	elseif chord == 'C-up' then
 		if Cursor_node.in_reply_to_id then
 			Cursor_node = Nodes[Cursor_node.in_reply_to_id]
@@ -46,4 +62,4 @@ on.keychord_press = function(chord, key)
 			end
 		end
 	end
-end
+end

0028-A

@@ -1,11 +1,28 @@
 A = function()
-	if Input_filename then
-		love.graphics.setFont(love.graphics.newFont(scale(20)))  -- editor objects implicitly depend on current font
-		local f = io.open(Input_filename)
-		assert(f)
-		local thread_data = json.decode(f:read('*a'))
-		f:close()
-		render_thread_to_surface(thread_data)
+	if Major_version >= 12 then
+		-- reload Url from network
+		if Url then
+			local initial_ml = ml_from_url(Url)
+			local thread_data = try_load_nodes_from_url(initial_ml)
+			render_thread_to_surface(thread_data)
+			Cursor_node = Root
+			if Nodes[initial_ml.id] then
+				Cursor_node = Nodes[initial_ml.id]
+			end
+			ensure_cursor_node_within_viewport()
+		end
+		B()
+	else
+		-- LÖVE pre-v12 has no https
+		-- reload same thread from file
+		if Input_filename then
+			love.graphics.setFont(love.graphics.newFont(scale(20)))  -- editor objects implicitly depend on current font
+			local f = io.open(Input_filename)
+			assert(f)
+			local thread_data = json.decode(f:read('*a'))
+			f:close()
+			render_thread_to_surface(thread_data)
+		end
+		B()
 	end
-	B()
 end

0031-Input_filename

@@ -1 +1,4 @@
-Input_filename = nil
+-- file containing the thread to render
+-- used only in LÖVE pre-v12 which didn't have https
+-- only ever initialized once; pre-v12 LÖVE can't load new threads
+Input_filename = nil

0048-get_toot

@@ -0,0 +1,13 @@
+get_toot = function(ml)
+	local url = url_from_ml(ml)
+	local code, response, response_headers = https.request(url)
+	local result = json.decode(response)
+	code, response, response_headers = https.request(url..'/context')
+	local rels = json.decode(response)
+	result.host = ml.host
+	result.user = ml.user
+	result.id = ml.id
+	result.ancestors = rels.ancestors
+	result.descendants = rels.descendants
+	return result
+end

0049-try_load_nodes_from_url

@@ -0,0 +1,8 @@
+try_load_nodes_from_url = function(initial_ml)
+	local result = get_toot(initial_ml)
+	if result.ancestors and #result.ancestors > 0 then
+		-- redo with oldest ancestor
+		result = get_toot(ml_from_url(result.ancestors[1].url))
+	end
+	return result
+end

0050-Url

@@ -0,0 +1 @@
+Url = nil

0051-ml_from_url

@@ -0,0 +1,6 @@
+ml_from_url = function(url)
+	local host, user, id = url:match('^([^/]*://[^/]*)/@([^/]*)/(%d*)$')
+	if host then return {host=host, user=user, id=id} end
+	local host, user, id = url:match('^([^/]*://[^/]*)/users/([^/]*)/statuses/(%d*)$')
+	if host then return {host=host, user=user, id=id} end
+end

0052-url_from_ml

@@ -0,0 +1,3 @@
+url_from_ml = function(ml)
+	return ('%s/api/v1/statuses/%s'):format(ml.host, ml.id)
+end

README.md

@@ -22,7 +22,7 @@ Pros:
 This repo is an example of a [Freewheeling App](http://akkartik.name/freewheeling),
 designed above all to be easy to run, easy to modify and easy to share.
 
-## Getting started
+## Getting started (LÖVE v11)
 
 Install the [Lua](https://www.lua.org) programming language. Just a 200KB
 download, open source and with a stellar reputation. I'll assume below that
@@ -52,6 +52,23 @@ LÖVE.
 
 Click on a toot to copy its URL to the clipboard.
 
+## Getting started (LÖVE v12 pre-release)
+
+Install LÖVE from a nightly build.
+* Go to https://github.com/love2d/love/actions
+* Click on the most recent successful build (with a green check mark before it)
+* Scroll down to the "Artifacts" section
+* Download the artifact for your OS
+    * If you don't have a Github account, these won't be clickable.
+      Copy the URL for the build and paste it into https://nightly.link to get
+      clickable links to artifacts.
+
+Run LÖVE from the commandline and pass in this directory. Optionally also pass
+in a link to a Mastodon toot.
+
+Copy a link to any mastodon toot and paste it into the app window using
+`ctrl+v` to view it in the context of its thread.
+
 ## Hacking
 
 To modify the code for the app without restarting the app each time, download

main.lua

@@ -1,5 +1,8 @@
 utf8 = require 'utf8'
 json = require 'json'
+if love.getVersion() >= 12 then
+  https = require 'https'
+end
 
 require 'app'
 require 'test'

unfurl.lua

@@ -1,3 +1,6 @@
+-- Helper for LÖVE pre-v12.
+-- Download a thread before running the LÖVE app on the results.
+
 json = require 'json'
 https = require 'ssl.https'