Release Create merged regions from time selection items v1.0.0

Regions/junishiscripts_Create merged regions from time selection items.lua

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+-- @description Create merged regions from time selection items
+-- @author Junishi Scripts
+-- @version 1.0.0
+-- @link X https://x.com/1496jun
+-- @about
+--   - Purpose
+--   Creates merged regions from media items within the current time selection in REAPER.
+--
+--   - Key Features
+--   Time Selection Based: Only items inside the current time selection are considered.
+--   Strict Item Range: Ignores fades—uses pure item start/end points.
+--   Auto Expansion: Regions expand to include overlapping items.
+--   Region Merging: Overlapping areas are merged into one.
+--
+--
+--   - Usage
+--   Set a time selection.
+--   Run the script.
+--   Regions will be created and labeled based on overlapping items.
+
+reaper.Undo_BeginBlock()
+
+-- Time Selection 範囲取得
+local time_start, time_end = reaper.GetSet_LoopTimeRange(false, false, 0, 0, false)
+if time_end <= time_start then
+  reaper.MB("Please set a valid time selection.", "Error", 0)
+  return
+end
+
+-- フェードを考慮せず、純粋なアイテム範囲のみを対象にする（安定性重視）
+local function get_strict_item_range(item)
+  local pos = reaper.GetMediaItemInfo_Value(item, "D_POSITION")
+  local len = reaper.GetMediaItemInfo_Value(item, "D_LENGTH")
+  return pos, pos + len
+end
+
+-- 指定された範囲に含まれるアイテムを使って拡張
+local function expand_region(start_pos, end_pos)
+  local changed = true
+  local iteration = 0
+  while changed and iteration < 10 do
+    changed = false
+    local new_start = start_pos
+    local new_end = end_pos
+
+    for t = 0, reaper.CountTracks(0) - 1 do
+      local track = reaper.GetTrack(0, t)
+      for i = 0, reaper.CountTrackMediaItems(track) - 1 do
+        local item = reaper.GetTrackMediaItem(track, i)
+        local istart, iend = get_strict_item_range(item)
+
+        if iend > start_pos and istart < end_pos then
+          if istart < new_start then
+            new_start = istart
+            changed = true
+          end
+          if iend > new_end then
+            new_end = iend
+            changed = true
+          end
+        end
+      end
+    end
+
+    start_pos = new_start
+    end_pos = new_end
+    iteration = iteration + 1
+  end
+
+  return start_pos, end_pos
+end
+
+-- Region候補収集
+local raw_regions = {}
+
+for t = 0, reaper.CountTracks(0) - 1 do
+  local track = reaper.GetTrack(0, t)
+  for i = 0, reaper.CountTrackMediaItems(track) - 1 do
+    local item = reaper.GetTrackMediaItem(track, i)
+    local istart, iend = get_strict_item_range(item)
+
+    if iend > time_start and istart < time_end then
+      local r_start, r_end = expand_region(istart, iend)
+      table.insert(raw_regions, {start = r_start, endp = r_end})
+    end
+  end
+end
+
+-- Region統合
+table.sort(raw_regions, function(a, b) return a.start < b.start end)
+
+local merged = {}
+for _, r in ipairs(raw_regions) do
+  if #merged == 0 then
+    table.insert(merged, r)
+  else
+    local last = merged[#merged]
+    if r.start <= last.endp then
+      last.endp = math.max(last.endp, r.endp)
+    else
+      table.insert(merged, r)
+    end
+  end
+end
+
+-- Region作成
+for i, r in ipairs(merged) do
+  reaper.AddProjectMarker2(0, true, r.start, r.endp, "TSRegion_" .. i, -1, 0)
+end
+
+reaper.Undo_EndBlock("Create stable merged regions from time selection", -1)
+