1 files changed, 124 insertions, 0 deletions
diff --git a/faderer.lua b/faderer.lua
new file mode 100644
index 0000000..e10167c
--- /dev/null
+++ b/faderer.lua
@@ -0,0 +1,124 @@
+script_name = "faderer"
+script_description = ""
+script_author = "garret"
+script_version = "1"
+
+include("karaskel.lua")
+include("utils.lua")
+
+
+local function exact_ms_from_frame(frame)
+--[[
+MIT License
+
+Copyright (c) 2022 arch1t3cht
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+]]
+  frame = frame + 1
+  local ms = aegisub.ms_from_frame(frame)
+  while true do
+    local new_ms = ms - 1
+    if new_ms < 0 or aegisub.frame_from_ms(new_ms) ~= frame then
+      break
+    end
+    ms = new_ms
+  end
+  return ms - 1
+end
+
+local function start_offset(pos, start_time)
+	if aegisub.decode_path("?video") ~= "?video" then
+		pos = exact_ms_from_frame(pos) else pos = aegisub.ms_from_frame(pos)
+	end
+	return pos - start_time
+end
+
+
+local function main(sub, sel, act)
+
+	local line = sub[act]
+	local pos = aegisub.project_properties().video_position
+
+	if string.find(line.effect, "t1:") then
+		local but, res = aegisub.dialog.display({
+			{class="dropdown", items={"Black", "White", "Alpha"}, value="Black", name="c"},
+		})
+
+		local t1
+		local t2
+		local c = res.c
+		local c_tags_out = {
+			Black = "\\c&H000000&\\3c&H000000&\\4c&H000000&",
+			White = "\\c&HFFFFFF&\\3c&HFFFFFF&\\4c&HFFFFFF&",
+			Alpha = "\\alpha&HFF&",
+		}
+
+		local fx_pattern = "t1:(%d+);"
+		t1 = string.match(line.effect, fx_pattern)
+		t2 = pos
+
+		t1 = start_offset(t1, line.start_time)
+		t2 = start_offset(t2, line.start_time)
+
+		local line_length = line.end_time - line.start_time
+
+		if t1 < 0 then line.start_time = line.start_time + t1; t1 = 0 end
+		line_length = line.end_time - line.start_time
+		if t2 > line_length then line.end_time = line.start_time + t2 end
+		line_length = line.end_time - line.start_time
+		local half_length = line_length / 2
+
+		local additional_tags = ""
+
+		if t1 == 0 or t2 < half_length then
+			if not string.match(line.text, "\\t") then
+				additional_tags = c_tags_out[c]
+			end
+			c = ""
+
+			local meta
+			local styles
+			meta, styles = karaskel.collect_head(sub, false)
+			local sty = styles[line.style]
+
+			for i,v in ipairs({"1","3","4"}) do
+				local style_colour = sty["color"..v]
+				c = c .. "\\"; if v ~= "1" then c = c .. v end
+				c = c .. "c".. util.color_from_style(style_colour)
+				c = c .. "\\"; if v ~= "1" then c = c .. v end
+				c = c .. "a" .. util.alpha_from_style(style_colour)
+			end
+		elseif t2 > half_length then
+			c = c_tags_out[c]
+		end
+
+		line.effect = string.gsub(line.effect, ";?"..fx_pattern, "")
+		local tags = additional_tags.."\\t("..t1..","..t2..","..c..")}"
+		local old_text = line.text
+		line.text = string.gsub(line.text, "}", tags, 1)
+		if old_text == line.text then line.text = "{"..tags .. line.text end
+	else
+		if line.effect ~= "" then line.effect = line.effect .. ";" end
+		line.effect = line.effect .. "t1:" .. pos .. ";"
+	end
+	sub[act] = line
+end
+
+aegisub.register_macro(script_name, script_description, main)