[PATCH] Alphabetical ordered lists

[Nathaniel Flath <flat0103@gmail.com>]

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Hello all,

One thing that had been bugging me was the inability to have an
ordered list of the form:

a.  Item 1
b.  Item 2
c.  Item 3

The following patch enables this, with lists going from a-z and A-Z.
Let me know if there are any issues with it.

Thanks,
Nathaniel Flath

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diff --git a/lisp/org-list.el b/lisp/org-list.el
old mode 100644
new mode 100755
index cdfd2c5..61e1e88
--- a/lisp/org-list.el
+++ b/lisp/org-list.el
@@ -227,11 +227,11 @@ If GENERAL is non-nil, return the general regexp independent of the value
 of `org-plain-list-ordered-item-terminator'."
   (cond
    ((or general (eq org-plain-list-ordered-item-terminator t))
-    "\\([ \t]*\\([-+]\\|\\([0-9]+[.)]\\)\\)\\|[ \t]+\\*\\)\\( \\|$\\)")
+    "\\([ \t]*\\([-+]\\|\\([0-9A-Za-z]+[.)]\\)\\)\\|[ \t]+\\*\\)\\( \\|$\\)")
    ((= org-plain-list-ordered-item-terminator ?.)
-    "\\([ \t]*\\([-+]\\|\\([0-9]+\\.\\)\\)\\|[ \t]+\\*\\)\\( \\|$\\)")
+    "\\([ \t]*\\([-+]\\|\\([0-9A-Za-z]+\\.\\)\\)\\|[ \t]+\\*\\)\\( \\|$\\)")
    ((= org-plain-list-ordered-item-terminator ?\))
-    "\\([ \t]*\\([-+]\\|\\([0-9]+)\\)\\)\\|[ \t]+\\*\\)\\( \\|$\\)")
+    "\\([ \t]*\\([-+]\\|\\([0-9A-Za-z]+)\\)\\)\\|[ \t]+\\*\\)\\( \\|$\\)")
    (t (error "Invalid value of `org-plain-list-ordered-item-terminator'"))))

 (defun org-at-item-p ()
@@ -298,7 +298,7 @@ Return t when things worked, nil when we are not in an item."
 	(cond
 	 ((and (org-at-item-p) (<= (point) eow))
 	  ;; before the bullet
-	  (beginning-of-line 1)
+	  (beginning-of-line )
 	  (open-line (if blank 2 1)))
 	 ((<= (point) eow)
 	  (beginning-of-line 1))
@@ -864,14 +864,13 @@ with something like \"1.\" or \"2)\"."
     ;; find where this list begins
     (org-beginning-of-item-list)
     (setq bobp (bobp))
-    (looking-at "[ \t]*[0-9]+\\([.)]\\)")
-    (setq fmt (concat "%d" (or (match-string 1) ".")))
-    (save-excursion
-      (goto-char (match-end 0))
-      (if (looking-at "[ \t]*\\[@start:\\([0-9]+\\)")
-	  (setq n (1- (string-to-number (match-string 1))))))
-    (beginning-of-line 0)
-    ;; walk forward and replace these numbers
+    (looking-at "[ \t]*\\([0-9A-Za-z]+\\)\\([.)]\\)")
+    (let* ((n (if (string-equal (match-string 1) "1") 0 (1- ?a)))
+	  (fmt (if (= n 0)
+	 	   (concat "%d" (or (match-string 2) "."))
+		 (concat "%c" (or (match-string 2) ".")))))
+      (beginning-of-line 0)
+      ;; walk forward and replace these numbers
     (catch 'exit
       (while t
 	(catch 'next
@@ -890,7 +889,8 @@ with something like \"1.\" or \"2)\"."
 	  (org-shift-item-indentation delta)
 	  (if (= (org-current-line) line) (setq col (+ col delta))))))
     (org-goto-line line)
-    (org-move-to-column col)))
+    (org-move-to-column col))))
+

 (defvar org-suppress-item-indentation) ; dynamically scoped parameter
 (defun org-fix-bullet-type (&optional force-bullet)

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