start rendering the initialized thread

This required a little more restructuring of Global_state. It's not flat
now, it's hierarchical again, but in a different way.

after commit 3d89b8eb9d:
  post
    \- reply A
        \- reply B
    \- reply C

after commit f9f7dab9b7:
  post
  reply A
  reply B
  reply C

after this commit:
  row
    \- col
        \- indent 0
        \- post
    \- col
        \- indent 1
        \- reply A
    \- col
        \- indent 2
        \- reply B
    \- col
        \- indent 1
        \- reply C

The indents are just invisible rectangles of different widths with 0
height.

One change I had to make was to initialize_editor. Neither luaML and
driver load lines from disk, but that's arguably the common scenario to
support.

0006-on.mouse_press

@@ -2,7 +2,7 @@ on.mouse_press = function(x,y, mouse_button)
 	if mouse_press_consumed_by_any_button_handler(Global_state, x,y, mouse_button) then
 		return
 	end
-	if Global_state.items then
+	if Global_state.root then
 		mouse_press_on_surface(x,y, mouse_button)
 	end
 end

0009-on.code_change

@@ -1,4 +1,6 @@
 on.code_change = function()
 	print('code changed')
-	A()
+	if Global_state.root then
+		A()
+	end
 end

0010-initialize_editor

@@ -4,7 +4,7 @@ initialize_editor = function(obj)
 		local scaled_fontsize = scale(20)
 		local scaled_lineheight = math.floor(scaled_fontsize*1.3)
 		obj.editor = edit.initialize_state(Menu_bar_height + vy(obj.y), math.floor(vx(obj.x)), math.ceil(vx(obj.x+obj.w)), scaled_fontsize, scaled_lineheight)
-		obj.editor.lines = load_array(obj.data)
+		obj.editor.lines = obj.data
 		Text.redraw_all(obj.editor)
 	end
 end

0012-on.initialize

@@ -1,4 +1,6 @@
 on.initialize = function()
+	local font = love.graphics.getFont()
+	font:setLineHeight(1.3)
 	Files = love.filesystem.getDirectoryItems('data')
 	for i=#Files,1,-1 do
 		if (not Files[i]:match('%.md$')) or Files[i]:match('%-%d+.md$') then
@@ -6,6 +8,4 @@ on.initialize = function()
 		end
 	end
 	table.sort(Files)
-	new_definition()
-	A()
-end
+end

0026-on.draw

@@ -1,11 +1,9 @@
 on.draw = function()
 	Global_state.button_handlers = {}
-	local font = love.graphics.getFont()
-	font:setLineHeight(1.3)
-	if Global_state.items == nil then
+	if Global_state.root == nil then
 		-- TODO: use surface for file picker as well
 		draw_file_picker()
 	else
 		draw_surface()
 	end
-end
+end

0028-A

@@ -1,11 +1,9 @@
 A = function(preserve_screen_top_of_cursor_node)
 --	print('A')
 	love.graphics.setFont(love.graphics.newFont(scale(20)))  -- editor objects implicitly depend on current font
-	-- translate Definitions to Surface
+	-- translate Global_state.root to Surface
 	Surface = {}
-	for key,node in pairs(Definitions) do
-		compute_layout(node, node.x,node.y, Surface, preserve_screen_top_of_cursor_node)
-	end
+	compute_layout(Global_state.root, 0,0, Surface, preserve_screen_top_of_cursor_node)
 	-- continue the pipeline
 	B(preserve_screen_top_of_cursor_node)
 	-- TODO: ugly that we're manipulating editor objects twice

0032-Definitions

@@ -1,3 +0,0 @@
-Definitions = {
-	-- table mapping names to boxes where we edit their definitions
-}

0077-new_definition

@@ -1,16 +0,0 @@
-new_definition = function()
-	if Cursor_node then
-		Cursor_node.show_cursor = false
-	end
-	table.insert(Definitions, {
-		type='text',
-		data={''},
-		x=Spawn_point.x, y=Spawn_point.y,
-		width=600,
-		bg=Border_color,  -- TODO: bg isn't accurate if obj.drawmode = 'line'
-	})
-	Viewport.x = Spawn_point.x-30
-	Viewport.y = Spawn_point.y-30
-	Cursor_node = Definitions[#Definitions]
-	Cursor_node.show_cursor = true
-end

0115-update_font_size

@@ -1,13 +0,0 @@
-update_font_size = function(n)
-	Font_height = n
-	love.graphics.setFont(love.graphics.newFont(Font_height))
-	local font = love.graphics.getFont()
-	font:setLineHeight(1.3)
-	Line_height = math.floor(Font_height*1.3)
-	Menu_bar_height = 5 + Line_height + 5
-	if Global_state.items then
-		for _,item in ipairs(Global_state.items) do
-			edit.update_font_settings(item, n)
-		end
-	end
-end

0117-open_thread

@@ -1,5 +1,6 @@
 open_thread = function(filename)
-	Global_state.items = {}
-	load_subtree(filename, Global_state.items)
+	Global_state.root = rows()
+	load_subtree(filename, Global_state.root.data, 0)
 	love.window.setTitle('pothi.love - '..filename)
+	A()
 end

0118-load_subtree

@@ -1,8 +1,14 @@
 load_subtree = function(filename, out, depth)
 	-- load a file and recursively all replies to it
 --	print('load_subtree', filename)
-	local item = initialize_item(filename)
-	table.insert(out, item)
+	local item = initialize_item(filename, depth)
+	-- every item is a row consisting of two columns:
+	-- one column of padding and another of text
+	local row = cols()
+	table.insert(row.data,
+		{type='rectangle', w=depth*Indent, h=0})
+	table.insert(row.data, item)
+	table.insert(out, row)
 	for i,reply_id in ipairs(item.metadata.replies) do
 		local reply = load_subtree(reply_id, out, depth+1)
 	end

0120-initialize_item

@@ -5,6 +5,8 @@ initialize_item = function(filename, depth)
 	result.data = result.lines
 	result.lines = nil
 	-- more fields
+	result.type = 'text'
+	result.width = Width
 	result.depth = depth
 	result.metadata = load_metadata(filename)
 	return result

0124-Indent

@@ -0,0 +1 @@
+Indent = 20  -- number of pixels to indent replies by

0125-Width

@@ -0,0 +1 @@
+Width = 600