org-element: Prefer lower case letters for blocks and keywords

* lisp/org-element.el (org-element-center-block-interpreter):
(org-element-dynamic-block-interpreter):
(org-element-inlinetask-interpreter):
(org-element-quote-block-interpreter):
(org-element-special-block-interpreter):
(org-element-babel-call-interpreter):
(org-element-comment-block-interpreter):
(org-element-example-block-interpreter):
(org-element-export-block-interpreter):
(org-element-keyword-interpreter):
(org-element-src-block-interpreter):
(org-element-verse-block-interpreter): Use lower case letters when
interpreting object.

* testing/lisp/test-org-element.el (test-org-element/example-block-parser):
(test-org-element/center-block-interpreter):
(test-org-element/dynamic-block-interpreter):
(test-org-element/inlinetask-interpreter):
(test-org-element/quote-block-interpreter):
(test-org-element/comment-block-interpreter):
(test-org-element/example-block-interpreter):
(test-org-element/keyword-interpreter):
(test-org-element/src-block-interpreter):
(test-org-element/verse-block-interpreter):
* testing/lisp/test-ox.el (test-org-export/handle-options):
(test-org-export/expand-macro):
(test-org-export/before-processing-hook): Update tests.

lisp/org-element.el

@@ -677,7 +677,7 @@ Assume point is at the beginning of the block."
 (defun org-element-center-block-interpreter (_ contents)
   "Interpret a center-block element as Org syntax.
 CONTENTS is the contents of the element."
-  (format "#+BEGIN_CENTER\n%s#+END_CENTER" contents))
+  (format "#+begin_center\n%s#+end_center" contents))
 
 
 ;;;; Drawer
@@ -787,7 +787,7 @@ Assume point is at beginning of dynamic block."
 (defun org-element-dynamic-block-interpreter (dynamic-block contents)
   "Interpret DYNAMIC-BLOCK element as Org syntax.
 CONTENTS is the contents of the element."
-  (format "#+BEGIN: %s%s\n%s#+END:"
+  (format "#+begin: %s%s\n%s#+end:"
 	  (org-element-property :block-name dynamic-block)
 	  (let ((args (org-element-property :arguments dynamic-block)))
 	    (if args (concat " " args) ""))
@@ -1187,18 +1187,18 @@ CONTENTS is the contents of inlinetask."
 		(concat
 		 (make-string
 		  (max (- (+ org-tags-column (length task) (length tags))) 1)
-		  ? )
+		  ?\s)
 		 tags))
 	       (t
 		(concat
-		 (make-string (max (- org-tags-column (length task)) 1) ? )
+		 (make-string (max (- org-tags-column (length task)) 1) ?\s)
 		 tags))))
 	    ;; Prefer degenerate inlinetasks when there are no
 	    ;; contents.
 	    (when contents
 	      (concat "\n"
 		      contents
-		      (make-string level ?*) " END")))))
+		      (make-string level ?*) " end")))))
 
 
 ;;;; Item
@@ -1541,7 +1541,7 @@ Assume point is at the beginning of the block."
 (defun org-element-quote-block-interpreter (_ contents)
   "Interpret quote-block element as Org syntax.
 CONTENTS is the contents of the element."
-  (format "#+BEGIN_QUOTE\n%s#+END_QUOTE" contents))
+  (format "#+begin_quote\n%s#+end_quote" contents))
 
 
 ;;;; Section
@@ -1627,7 +1627,7 @@ Assume point is at the beginning of the block."
   "Interpret SPECIAL-BLOCK element as Org syntax.
 CONTENTS is the contents of the element."
   (let ((block-type (org-element-property :type special-block)))
-    (format "#+BEGIN_%s\n%s#+END_%s" block-type contents block-type)))
+    (format "#+begin_%s\n%s#+end_%s" block-type contents block-type)))
 
 
 
@@ -1695,7 +1695,7 @@ containing `:call', `:inside-header', `:arguments',
 
 (defun org-element-babel-call-interpreter (babel-call _)
   "Interpret BABEL-CALL element as Org syntax."
-  (concat "#+CALL: "
+  (concat "#+call: "
 	  (org-element-property :call babel-call)
 	  (let ((h (org-element-property :inside-header babel-call)))
 	    (and h (format "[%s]" h)))
@@ -1849,7 +1849,7 @@ Assume point is at comment block beginning."
 
 (defun org-element-comment-block-interpreter (comment-block _)
   "Interpret COMMENT-BLOCK element as Org syntax."
-  (format "#+BEGIN_COMMENT\n%s#+END_COMMENT"
+  (format "#+begin_comment\n%s#+end_comment"
 	  (org-element-normalize-string
 	   (org-remove-indentation
 	    (org-element-property :value comment-block)))))
@@ -1977,14 +1977,14 @@ containing `:begin', `:end', `:number-lines', `:preserve-indent',
   "Interpret EXAMPLE-BLOCK element as Org syntax."
   (let ((switches (org-element-property :switches example-block))
 	(value (org-element-property :value example-block)))
-    (concat "#+BEGIN_EXAMPLE" (and switches (concat " " switches)) "\n"
+    (concat "#+begin_example" (and switches (concat " " switches)) "\n"
 	    (org-element-normalize-string
 	     (org-escape-code-in-string
 	      (if (or org-src-preserve-indentation
 		      (org-element-property :preserve-indent example-block))
 		  value
 		(org-remove-indentation value))))
-	    "#+END_EXAMPLE")))
+	    "#+end_example")))
 
 
 ;;;; Export Block
@@ -2037,7 +2037,7 @@ Assume point is at export-block beginning."
 
 (defun org-element-export-block-interpreter (export-block _)
   "Interpret EXPORT-BLOCK element as Org syntax."
-  (format "#+BEGIN_EXPORT %s\n%s#+END_EXPORT"
+  (format "#+begin_export %s\n%s#+end_export"
 	  (org-element-property :type export-block)
 	  (org-element-property :value export-block)))
 
@@ -2164,7 +2164,7 @@ containing `:key', `:value', `:begin', `:end', `:post-blank' and
 (defun org-element-keyword-interpreter (keyword _)
   "Interpret KEYWORD element as Org syntax."
   (format "#+%s: %s"
-	  (org-element-property :key keyword)
+	  (downcase (org-element-property :key keyword))
 	  (org-element-property :value keyword)))
 
 
@@ -2507,12 +2507,12 @@ Assume point is at the beginning of the block."
 	     (let ((ind (make-string org-edit-src-content-indentation ?\s)))
 	       (replace-regexp-in-string
 		"^" ind (org-remove-indentation val))))))))
-    (concat (format "#+BEGIN_SRC%s\n"
+    (concat (format "#+begin_src%s\n"
 		    (concat (and lang (concat " " lang))
 			    (and switches (concat " " switches))
 			    (and params (concat " " params))))
 	    (org-element-normalize-string (org-escape-code-in-string value))
-	    "#+END_SRC")))
+	    "#+end_src")))
 
 
 ;;;; Table
@@ -2660,7 +2660,7 @@ Assume point is at beginning of the block."
 (defun org-element-verse-block-interpreter (_ contents)
   "Interpret verse-block element as Org syntax.
 CONTENTS is verse block contents."
-  (format "#+BEGIN_VERSE\n%s#+END_VERSE" contents))
+  (format "#+begin_verse\n%s#+end_verse" contents))
 
 
 

testing/lisp/test-org-element.el

@@ -728,9 +728,9 @@ Some other text
 	 (org-element-type (org-element-at-point)))))
   ;; Properly un-escape code.
   (should
-   (equal "* Headline\n #+keyword\nText\n"
+   (equal "* Headline\n #+keyword:\nText\n"
 	  (org-test-with-temp-text
-	      "#+BEGIN_EXAMPLE\n,* Headline\n ,#+keyword\nText\n#+END_EXAMPLE"
+	      "#+BEGIN_EXAMPLE\n,* Headline\n ,#+keyword:\nText\n#+END_EXAMPLE"
 	    (org-element-property :value (org-element-at-point)))))
   ;; Handle non-empty blank line at the end of buffer.
   (should
@@ -2570,7 +2570,7 @@ Outside list"
   "Test center block interpreter."
   (should
    (equal (org-test-parse-and-interpret "#+BEGIN_CENTER\nTest\n#+END_CENTER")
-	  "#+BEGIN_CENTER\nTest\n#+END_CENTER\n")))
+	  "#+begin_center\nTest\n#+end_center\n")))
 
 (ert-deftest test-org-element/drawer-interpreter ()
   "Test drawer interpreter."
@@ -2583,7 +2583,7 @@ Outside list"
   (should
    (equal (org-test-parse-and-interpret
 	   "#+BEGIN: myblock :parameter value1\nTest\n#+END:")
-	  "#+BEGIN: myblock :parameter value1\nTest\n#+END:\n")))
+	  "#+begin: myblock :parameter value1\nTest\n#+end:\n")))
 
 (ert-deftest test-org-element/footnote-definition-interpreter ()
   "Test footnote definition interpreter."
@@ -2649,13 +2649,13 @@ Outside list"
       ;; 1. Regular inlinetask.
      (should (equal (org-test-parse-and-interpret
 		     "*************** Task\nTest\n*************** END")
-		    "*************** Task\nTest\n*************** END\n"))
+		    "*************** Task\nTest\n*************** end\n"))
      ;; 2. Degenerate inlinetask.
      (should (equal (org-test-parse-and-interpret "*************** Task")
 		    "*************** Task\n"))
      ;; 3. Prefer degenerate form when there are no contents.
      (should (equal (org-test-parse-and-interpret
-		     "*************** Task\n*************** END")
+		     "*************** Task\n*************** end")
 		    "*************** Task\n"))
      ;; 4. With TODO keywords.
      (should
@@ -2731,26 +2731,26 @@ Outside list"
   "Test quote block interpreter."
   (should (equal (org-test-parse-and-interpret
 		  "#+BEGIN_QUOTE\nTest\n#+END_QUOTE")
-		 "#+BEGIN_QUOTE\nTest\n#+END_QUOTE\n")))
+		 "#+begin_quote\nTest\n#+end_quote\n")))
 
 (ert-deftest test-org-element/special-block-interpreter ()
   "Test special block interpreter."
   (should (equal (org-test-parse-and-interpret
 		  "#+BEGIN_SPECIAL\nTest\n#+END_SPECIAL")
-		 "#+BEGIN_SPECIAL\nTest\n#+END_SPECIAL\n")))
+		 "#+begin_SPECIAL\nTest\n#+end_SPECIAL\n")))
 
 (ert-deftest test-org-element/babel-call-interpreter ()
   "Test Babel call interpreter."
   ;; Without argument.
   (should (equal (org-test-parse-and-interpret "#+CALL: test()")
-		 "#+CALL: test()\n"))
+		 "#+call: test()\n"))
   ;; With argument.
   (should (equal (org-test-parse-and-interpret "#+CALL: test(x=2)")
-		 "#+CALL: test(x=2)\n"))
+		 "#+call: test(x=2)\n"))
   ;; With header arguments.
   (should (equal (org-test-parse-and-interpret
 		  "#+CALL: test[:results output]() :results html")
-		 "#+CALL: test[:results output]() :results html\n")))
+		 "#+call: test[:results output]() :results html\n")))
 
 (ert-deftest test-org-element/clock-interpreter ()
   "Test clock interpreter."
@@ -2781,12 +2781,11 @@ CLOCK: [2012-01-01 sun. 00:01]--[2012-01-01 sun. 00:02] =>  0:01"))))
   "Test comment block interpreter."
   (should (equal (org-test-parse-and-interpret
 		  "#+BEGIN_COMMENT\nTest\n#+END_COMMENT")
-		 "#+BEGIN_COMMENT\nTest\n#+END_COMMENT\n"))
+		 "#+begin_comment\nTest\n#+end_comment\n"))
   ;; Accept missing final newline in value.
   (should
-   (equal
-    "#+BEGIN_COMMENT\nTest\n#+END_COMMENT\n"
-    (org-element-interpret-data '(comment-block (:value "Test"))))))
+   (equal "#+begin_comment\nTest\n#+end_comment\n"
+	  (org-element-interpret-data '(comment-block (:value "Test"))))))
 
 (ert-deftest test-org-element/diary-sexp ()
   "Test diary-sexp interpreter."
@@ -2801,28 +2800,29 @@ CLOCK: [2012-01-01 sun. 00:01]--[2012-01-01 sun. 00:02] =>  0:01"))))
   ;; Without switches.
   (should (equal (org-test-parse-and-interpret
 		  "#+BEGIN_EXAMPLE\nTest\n#+END_EXAMPLE")
-		 "#+BEGIN_EXAMPLE\nTest\n#+END_EXAMPLE\n"))
+		 "#+begin_example\nTest\n#+end_example\n"))
   ;; With switches.
   (should
    (equal (org-test-parse-and-interpret
 	   "#+BEGIN_EXAMPLE -n -k\n(+ 1 1)\n#+END_EXAMPLE")
-	  "#+BEGIN_EXAMPLE -n -k\n(+ 1 1)\n#+END_EXAMPLE\n"))
+	  "#+begin_example -n -k\n(+ 1 1)\n#+end_example\n"))
   ;; Preserve code escaping.
   (should
-   (equal (org-test-parse-and-interpret
-	   "#+BEGIN_EXAMPLE\n,* Headline\n ,#+keyword\nText #+END_EXAMPLE")
-	  "#+BEGIN_EXAMPLE\n,* Headline\n ,#+keyword\nText #+END_EXAMPLE\n"))
+   (equal
+    (org-test-parse-and-interpret
+     "#+BEGIN_EXAMPLE\n,* Headline\n,#+KEYWORD: value\nText\n#+END_EXAMPLE")
+    "#+begin_example\n,* Headline\n,#+KEYWORD: value\nText\n#+end_example\n"))
   ;; Accept missing final newline in value.
   (should
    (equal
-    "#+BEGIN_EXAMPLE\nTest\n#+END_EXAMPLE\n"
+    "#+begin_example\nTest\n#+end_example\n"
     (org-element-interpret-data '(example-block (:value "Test"))))))
 
 (ert-deftest test-org-element/export-block-interpreter ()
   "Test export block interpreter."
   (should (equal (org-test-parse-and-interpret
-		  "#+BEGIN_EXPORT HTML\nTest\n#+END_EXPORT")
-		 "#+BEGIN_EXPORT HTML\nTest\n#+END_EXPORT\n")))
+		  "#+begin_export HTML\nTest\n#+end_export")
+		 "#+begin_export HTML\nTest\n#+end_export\n")))
 
 (ert-deftest test-org-element/fixed-width-interpreter ()
   "Test fixed width interpreter."
@@ -2857,7 +2857,7 @@ CLOCK: [2012-01-01 sun. 00:01]--[2012-01-01 sun. 00:02] =>  0:01"))))
 (ert-deftest test-org-element/keyword-interpreter ()
   "Test keyword interpreter."
   (should (equal (org-test-parse-and-interpret "#+KEYWORD: value")
-		 "#+KEYWORD: value\n")))
+		 "#+keyword: value\n")))
 
 (ert-deftest test-org-element/latex-environment-interpreter ()
   "Test latex environment interpreter."
@@ -2893,21 +2893,22 @@ DEADLINE: <2012-03-29 thu.> SCHEDULED: <2012-03-29 thu.> CLOSED: [2012-03-29 thu
 		(org-src-preserve-indentation nil))
 	    (org-test-parse-and-interpret
 	     "#+BEGIN_SRC emacs-lisp :results silent\n(+ 1 1)\n#+END_SRC"))
-	  "#+BEGIN_SRC emacs-lisp :results silent\n  (+ 1 1)\n#+END_SRC\n"))
+	  "#+begin_src emacs-lisp :results silent\n  (+ 1 1)\n#+end_src\n"))
   ;; With switches.
   (should
    (equal (let ((org-edit-src-content-indentation 2)
 		(org-src-preserve-indentation nil))
 	    (org-test-parse-and-interpret
 	     "#+BEGIN_SRC emacs-lisp -n -k\n(+ 1 1)\n#+END_SRC"))
-	  "#+BEGIN_SRC emacs-lisp -n -k\n  (+ 1 1)\n#+END_SRC\n"))
+	  "#+begin_src emacs-lisp -n -k\n  (+ 1 1)\n#+end_src\n"))
   ;; Preserve code escaping.
   (should
-   (equal (let ((org-edit-src-content-indentation 2)
-		(org-src-preserve-indentation nil))
-	    (org-test-parse-and-interpret
-	     "#+BEGIN_SRC org\n,* Headline\n ,#+keyword\nText #+END_SRC"))
-	  "#+BEGIN_SRC org\n,* Headline\n ,#+keyword\nText #+END_SRC\n"))
+   (equal
+    (let ((org-edit-src-content-indentation 2)
+	  (org-src-preserve-indentation nil))
+      (org-test-parse-and-interpret
+       "#+BEGIN_SRC org\n,* Headline\n,#+KEYWORD: value\nText\n#+END_SRC"))
+    "#+begin_src org\n  ,* Headline\n  ,#+KEYWORD: value\n  Text\n#+end_src\n"))
   ;; Do not apply `org-edit-src-content-indentation' when preserving
   ;; indentation.
   (should
@@ -2915,17 +2916,17 @@ DEADLINE: <2012-03-29 thu.> SCHEDULED: <2012-03-29 thu.> CLOSED: [2012-03-29 thu
 		(org-src-preserve-indentation t))
 	    (org-test-parse-and-interpret
 	     "#+BEGIN_SRC emacs-lisp\n(+ 1 1)\n#+END_SRC"))
-	  "#+BEGIN_SRC emacs-lisp\n(+ 1 1)\n#+END_SRC\n"))
+	  "#+begin_src emacs-lisp\n(+ 1 1)\n#+end_src\n"))
   (should
    (equal (let ((org-edit-src-content-indentation 2)
 		(org-src-preserve-indentation nil))
 	    (org-test-parse-and-interpret
 	     "#+BEGIN_SRC emacs-lisp -i\n(+ 1 1)\n#+END_SRC"))
-	  "#+BEGIN_SRC emacs-lisp -i\n(+ 1 1)\n#+END_SRC\n"))
+	  "#+begin_src emacs-lisp -i\n(+ 1 1)\n#+end_src\n"))
   ;; Accept missing final newline in value.
   (should
    (equal
-    "#+BEGIN_SRC emacs-lisp\n  Test\n#+END_SRC\n"
+    "#+begin_src emacs-lisp\n  Test\n#+end_src\n"
     (let ((org-edit-src-content-indentation 2)
 	  (org-src-preserve-indentation nil))
       (org-element-interpret-data
@@ -3054,7 +3055,7 @@ DEADLINE: <2012-03-29 thu.> SCHEDULED: <2012-03-29 thu.> CLOSED: [2012-03-29 thu
   "Test verse block interpretation."
   (should
    (equal (org-test-parse-and-interpret "#+BEGIN_VERSE\nTest\n#+END_VERSE")
-	  "#+BEGIN_VERSE\nTest\n#+END_VERSE\n")))
+	  "#+begin_verse\nTest\n#+end_verse\n")))
 
 (ert-deftest test-org-element/bold-interpreter ()
   "Test bold interpreter."

testing/lisp/test-ox.el

@@ -439,7 +439,7 @@ Paragraph"
 	      (org-export-as (org-test-default-backend)
 			     nil nil nil '(:exclude-tags ("noexp")))))))
   (should
-   (equal "#+FILETAGS: noexp\n"
+   (equal "#+filetags: noexp\n"
 	  (let (org-export-filter-body-functions
 		org-export-filter-final-output-functions)
 	    (org-test-with-temp-text "#+FILETAGS: noexp\n* Head1"
@@ -1345,7 +1345,7 @@ Footnotes[fn:2], foot[fn:test] and [fn:inline:inline footnote]
   (require 'ox-org)
   ;; Standard macro expansion.
   (should
-   (equal "#+MACRO: macro1 value\nvalue\n"
+   (equal "#+macro: macro1 value\nvalue\n"
 	  (org-test-with-temp-text "#+MACRO: macro1 value\n{{{macro1}}}"
 	    (org-export-as (org-test-default-backend)))))
   ;; Include global macros.  However, local macros override them.
@@ -1365,7 +1365,7 @@ Footnotes[fn:2], foot[fn:test] and [fn:inline:inline footnote]
 	    (let ((org-export-global-macros '(("M" . "(eval (+ 1 1))"))))
 	      (org-export-as (org-test-default-backend))))))
   (should
-   (equal "#+MACRO: M local\nlocal\n"
+   (equal "#+macro: M local\nlocal\n"
 	  (org-test-with-temp-text "#+macro: M local\n{{{M}}}"
 	    (let ((org-export-global-macros '(("M" . "global"))))
 	      (org-export-as (org-test-default-backend))))))
@@ -1373,7 +1373,7 @@ Footnotes[fn:2], foot[fn:test] and [fn:inline:inline footnote]
   ;; Standard macro expansion.
   (should
    (string-match
-    "#\\+K: value"
+    "#\\+k: value"
     (let ((backend (org-export-create-backend
 		    :parent 'org
 		    :options '((:k "K" nil nil parse)))))
@@ -1386,7 +1386,7 @@ Footnotes[fn:2], foot[fn:test] and [fn:inline:inline footnote]
 		    :parent 'org
 		    :options '((:k "K" nil nil parse)))))
       (org-test-with-temp-text
-	  "#+MACRO: m v\n* H\n:PROPERTIES:\n:EXPORT_K: {{{m}}}\n:END:"
+	  "#+macro: m v\n* H\n:PROPERTIES:\n:EXPORT_K: {{{m}}}\n:END:"
 	(org-export-as backend nil nil nil '(:with-properties t))))))
   ;; Expand specific macros.
   (should
@@ -1445,7 +1445,7 @@ Footnotes[fn:2], foot[fn:test] and [fn:inline:inline footnote]
   "Test `org-export-before-processing-hook'."
   (should
    (equal
-    "#+MACRO: mac val\nTest\n"
+    "#+macro: mac val\nTest\n"
     (org-test-with-temp-text "#+MACRO: mac val\n{{{mac}}} Test"
       (let ((org-export-before-processing-hook
 	     '((lambda (backend)