Patchwork [O] Dynamically demote included file relatively to the current heading level

diff --git a/lisp/org-exp.el b/lisp/org-exp.el
index eae5be7..7e0512d 100644
--- a/lisp/org-exp.el
+++ b/lisp/org-exp.el
@@ -2381,13 +2381,14 @@  TYPE must be a string, any of:
 (defun org-export-handle-include-files ()
   "Include the contents of include files, with proper formatting."
   (let ((case-fold-search t)
-	params file markup lang start end prefix prefix1 switches all minlevel lines)
+	params file markup lang start end prefix prefix1 switches all currentlevel minlevel addlevel lines)
     (goto-char (point-min))
     (while (re-search-forward "^#\\+INCLUDE:?[ \t]+\\(.*\\)" nil t)
       (setq params (read (concat "(" (match-string 1) ")"))
 	    prefix (org-get-and-remove-property 'params :prefix)
 	    prefix1 (org-get-and-remove-property 'params :prefix1)
 	    minlevel (org-get-and-remove-property 'params :minlevel)
+	    addlevel (org-get-and-remove-property 'params :addlevel)
 	    lines (org-get-and-remove-property 'params :lines)
 	    file (org-symname-or-string (pop params))
 	    markup (org-symname-or-string (pop params))
@@ -2396,6 +2397,8 @@  TYPE must be a string, any of:
 	    switches (mapconcat #'(lambda (x) (format "%s" x)) params " ")
 	    start nil end nil)
       (delete-region (match-beginning 0) (match-end 0))
+      (setq currentlevel (or (org-current-level)
+			     0))
       (if (or (not file)
 	      (not (file-exists-p file))
 	      (not (file-readable-p file)))
@@ -2411,7 +2414,7 @@  TYPE must be a string, any of:
 		  end  (format "#+end_%s" markup))))
 	(insert (or start ""))
 	(insert (org-get-file-contents (expand-file-name file)
-				       prefix prefix1 markup minlevel lines))
+				       prefix prefix1 markup currentlevel minlevel addlevel lines))
 	(or (bolp) (newline))
 	(insert (or end ""))))
     all))
@@ -2428,13 +2431,15 @@  TYPE must be a string, any of:
 	(when intersection
 	  (error "Recursive #+INCLUDE: %S" intersection))))))
 
-(defun org-get-file-contents (file &optional prefix prefix1 markup minlevel lines)
+(defun org-get-file-contents (file &optional prefix prefix1 markup parentlevel minlevel addlevel lines)
   "Get the contents of FILE and return them as a string.
 If PREFIX is a string, prepend it to each line.  If PREFIX1
 is a string, prepend it to the first line instead of PREFIX.
 If MARKUP, don't protect org-like lines, the exporter will
-take care of the block they are in.  If LINES is a string
-specifying a range of lines, include only those lines ."
+take care of the block they are in.  If ADDLEVEL is a number,
+demote included file to current heading level+ADDLEVEL.
+If LINES is a string specifying a range of lines,
+include only those lines."
   (if (stringp markup) (setq markup (downcase markup)))
   (with-temp-buffer
     (insert-file-contents file)
@@ -2467,7 +2472,14 @@  specifying a range of lines, include only those lines ."
     (when minlevel
       (dotimes (lvl minlevel)
 	(org-map-region 'org-demote (point-min) (point-max))))
-    (buffer-string)))
+    (when addlevel
+      (let ((inclevel (or (if (org-before-first-heading-p)
+			      (- (outline-next-heading) 1)
+			    (- (org-current-level) 1))
+			  0)))
+	(dotimes (level (- (+ parentlevel addlevel) inclevel))
+	  (org-map-region 'org-demote (point-min) (point-max)))))
+      (buffer-string)))
 
 (defun org-get-and-remove-property (listvar prop)
   "Check if the value of LISTVAR contains PROP as a property.
diff --git a/testing/examples/include-1.org b/testing/examples/include-1.org
new file mode 100644
index 0000000..0c7ed29
--- /dev/null
+++ b/testing/examples/include-1.org
@@ -0,0 +1,8 @@ 
+
+* Include 1 header (initial level is 1)
+
+Some text in include1.
+
+Followed by a demoted include.
+
+#+INCLUDE: "include-2.org" :addlevel 1
diff --git a/testing/examples/include-2.org b/testing/examples/include-2.org
new file mode 100644
index 0000000..8558947
--- /dev/null
+++ b/testing/examples/include-2.org
@@ -0,0 +1,4 @@ 
+
+* Include 2 header (initial level is 1)
+
+Some text in include 2.
diff --git a/testing/examples/include-addlevel.txt b/testing/examples/include-addlevel.txt
new file mode 100644
index 0000000..c4fd1c3
--- /dev/null
+++ b/testing/examples/include-addlevel.txt
@@ -0,0 +1,58 @@ 
+                       Test #+INCLUDE: addlevel
+                       ========================
+
+Author: Test user
+Date: 
+
+
+Table of Contents
+=================
+1 Top level1 header1 
+2 Include 1 header (initial level is 1) 
+    2.1 Include 2 header (initial level is 1) 
+3 Top level1 header2 
+    3.1 Include 1 header (initial level is 1) 
+        3.1.1 Include 2 header (initial level is 1) 
+
+
+1 Top level1 header1 
+---------------------
+
+Following come a level1
+
+
+2 Include 1 header (initial level is 1) 
+----------------------------------------
+
+Some text in include1.
+
+Followed by a demoted include.
+
+
+2.1 Include 2 header (initial level is 1) 
+==========================================
+
+Some text in include 2.
+
+
+
+3 Top level1 header2 
+---------------------
+
+Following come a level1 header demoted to level2
+
+
+3.1 Include 1 header (initial level is 1) 
+==========================================
+
+Some text in include1.
+
+Followed by a demoted include.
+
+
+3.1.1 Include 2 header (initial level is 1) 
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Some text in include 2.
+
+
diff --git a/testing/examples/include-master.org b/testing/examples/include-master.org
new file mode 100644
index 0000000..f63b883
--- /dev/null
+++ b/testing/examples/include-master.org
@@ -0,0 +1,15 @@ 
+#+TITLE: Test #+INCLUDE: addlevel
+#+AUTHOR: Test user
+#+DATE:
+
+* Top level1 header1
+
+Following come a level1
+
+#+INCLUDE: "include-1.org"
+
+* Top level1 header2
+
+Following come a level1 header demoted to level2
+
+#+INCLUDE: "include-1.org" :addlevel 1