From e96933c17a25d6a4a90e35d68ab3d2f40a4ec8f9 Mon Sep 17 00:00:00 2001
From: garret <garret@airmail.cc>
Date: Thu, 16 Feb 2023 02:23:58 +0000
Subject: dupe and comment: handle fold boundaries

---
 macros/garret.dupe-and-comment.lua | 51 +++++++++++++++++++++++++++++++-------
 1 file changed, 42 insertions(+), 9 deletions(-)

diff --git a/macros/garret.dupe-and-comment.lua b/macros/garret.dupe-and-comment.lua
index 19f97a0..e89d774 100644
--- a/macros/garret.dupe-and-comment.lua
+++ b/macros/garret.dupe-and-comment.lua
@@ -1,7 +1,7 @@
 script_name="Dupe and Comment"
 script_description="Copies a line and comments out the original.\nbecause i like seeing the original while editing, and being able to go back to it easily"
 script_author = "garret"
-script_version = "3.0.2"
+script_version = "4.0.0"
 script_namespace = "garret.dupe-and-comment"
 
 local haveDepCtrl, DependencyControl, depctrl = pcall(require, "l0.DependencyControl")
@@ -11,23 +11,48 @@ if haveDepCtrl then
     }
 end
 
+local function strnumtobool(i) if i == "0" then return false else return true end end
+
+local function find_fold_boundary(line)
+    local fold = line.extra["_aegi_folddata"]
+
+    if fold then -- we are indeed at a fold boundary
+        -- now work out which one
+        local at_fold_end = strnumtobool(string.sub(fold, 1, 1))
+        -- first char is a bool, 0 = at start, 1 = at end
+        return at_fold_end
+    end
+end
+
 local function comment(subs, sel, act)
     for i=#sel,1,-1 do
         local edit=subs[sel[i]] -- current line
         local original=subs[sel[i]] -- and a copy of it
 
-        -- now use that copy for a different line
+        -- deal with being at the start/end of a fold
+        local at_fold_end = find_fold_boundary(edit)
+
+        if at_fold_end then
+            edit.extra["_aegi_folddata"] = nil -- remove fold data from the edit
+            -- but not from the dupe, so effectively the end of the fold gets moved down one
+        elseif at_fold_end == false then -- if at fold start
+            original.extra["_aegi_folddata"] = nil -- ditto ^, but from the original
+            -- so we don't have loads of extra fold starts that might interfere later
+        end
+
+        subs[sel[i]] = edit
+
+        -- now use that copy we made to make a different line
         original.comment = true -- comment out the new dupe line
         subs.insert(sel[i]+1, original) -- and put it below
 
---        if #sel > 1 then
-            -- sort out sel/act
-            local preceding_lines = i - 1
-            local on_act = act == sel[i]
+        -- sort out sel/act
+        local preceding_lines = i - 1
+        local on_act = act == sel[i]
+
+        sel[i] = sel[i] + preceding_lines
+        if on_act then act = sel[i] end
 
-            sel[i] = sel[i] + preceding_lines
-            if on_act then act = sel[i] end
---        end
     end
     aegisub.set_undo_point(script_name)
     return sel, act
@@ -41,6 +66,14 @@ local function undo(subs, sel, act)
 
             if edit.comment == false and original.comment == true then
                 original.comment = false
+                -- deal with being at the start/end of a fold
+
+                local at_fold_end = find_fold_boundary(edit)
+                if at_fold_end == false then -- that is, if we're at the start
+                    original.extra["_aegi_folddata"] = edit.extra["_aegi_folddata"]
+                    -- preserve the original fold boundary so the fold doesnt magically disappear
+                end
+
                 subs[sel[i]+1] = original
                 subs.delete(sel[i])
 
-- 
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