Aegisub/automation/autoload/kara-templater.lua

--[[
 Copyright (c) 2007, Niels Martin Hansen, Rodrigo Braz Monteiro
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-- Aegisub Automation 4 Lua karaoke templater tool
-- Parse and apply a karaoke effect written in ASS karaoke template language
-- See help file and wiki for more information on this

script_name = "Karaoke Templater"
script_description = "Macro and export filter to apply karaoke effects using the template language"
script_author = "Niels Martin Hansen"
script_version = 1


include("karaskel.lua")


-- Find and parse/prepare all karaoke template lines
function parse_templates(meta, styles, subs)
	local templates = { once = {}, line = {}, syl = {}, char = {}, furi = {} }
	for l = 1, #subs do
		local l = subs[i]
		if l.class == "dialogue" and l.comment then
			local fx, fxtail = string.headtail(l.effect)
			fx = fx:lower()
			if fx == "code" then
				parse_code(meta, styles, l, templates, fxtail)
			elseif fx == "template" then
				parse_template(meta, styles, l, templates, fxtail)
			end
		end
	end
end

function parse_code(meta, styles, line, templates, mods)
	local template = { code = line.text, loops = 1, all = false }
	local inserted = false

	local rest = mods
	while rest ~= "" do
		local m, t = string.headtail(rest)
		rest = t
		m = m:lower()
		if m == "once" then
			table.insert(templates.once, template)
			inserted = true
		elseif m == "line" then
			table.insert(templates.line, template)
			inserted = true
		elseif m == "syl" then
			table.insert(templates.syl, template)
			inserted = true
		elseif m == "char" then
			table.insert(templates.char, template)
			inserted = true
		elseif m == "furi" then
			table.insert(templates.furi, template)
			inserted = true
		elseif m == "all" then
			template.all = true
		elseif m == "repeat" then
			local times, t = string.headtail(rest)
			template.loops = tonumber(times)
			if not template.loops then
				aegisub.out(3, "Failed reading this repeat-count to a number: %s\nIn template code line: %s\nEffect field: %s\n\n", times, line.text, line.effect)
				template.loops = 1
			else
				rest = t
			end
		end
	end
	
	if not inserted then
		table.insert(templates.once, template)
	end
end

function parse_template(meta, styles, line, templates, mods)
end


-- Apply the templates
function apply_templates(meta, styles, subs, templates)
	-- the environment the templates will run in
	local tenv = {
		-- put in some standard libs
		string = string,
		math = math
	}
	
	-- run all run-once code snippets
	for k, t in pairs(templates.code) do
		
	end
end


-- Main function to do the templating
function filter_apply_templates(subs, config)
	aegisub.progress.task("Collecting header data...")
	local meta, styles = karaskel.collect_head(subs)
	
	aegisub.progress.task("Parsing templates...")
	local templates = parse_templates(meta, styles, subs)
	
	aegisub.progress.task("Applying templates...")
	apply_templates(meta, styles, subs, templates)
end

function macro_apply_templates(subs, sel)
	filter_apply_templates(subs, {ismacro=true, sel=sel})
	aegisub.set_undo_point("apply karaoke template")
end

function macro_can_template(subs)
	-- check if this file has templates in it, don't allow running the macro if it hasn't
	local num_dia = 0
	for i = 1, #subs do
		local l = subs[i]
		if l.class == "dialogue" then
			num_dia = num_dia + 1
			-- test if the line is a template
			if (string.headtail(l.effect)):lower() == "template" then
				return true
			end
			-- don't try forever, this has to be fast
			if num_dia > 50 then
				return false
			end
		end
	end
	return false
end

aegisub.register_macro("Apply karaoke template", "Applies karaoke effects from templates", macro_apply_templates, macro_can_template)
aegisub.register_filter("Karaoke temokate", "Apply karaoke effect templates to the subtitles", 2000, filter_apply_templates)