inject git-describe version into org.el during install

	* lisp/org.el (org-git-version): placeholder for recording the Git
	version of org during install
	* lisp/org.el (org-version): initialize local git-version with
	placeholder and fall through using it when org is not installed in
	a Git repository

lisp/Makefile

@@ -2,6 +2,11 @@ ifeq ($(MAKELEVEL), 0)
   $(error This make needs to be started as a sub-make from the toplevel directory.)
 endif
 
+GITVERSION = $(shell git describe --abbrev=6 HEAD)
+ifneq ($(shell git status -uno --porcelain), '')
+  GITVERSION := $(GITVERSION).dirty
+endif
+
 LISPO = org-install.el
 LISPF = $(subst $(LISPO),,$(wildcard *.el))
 LISPC = $(LISPF:%el=%elc)
@@ -26,6 +31,8 @@ org-install.el:	$(LISPC)
 install:	$(LISPF) compile autoloads
 	if [ ! -d $(lispdir) ]; then $(MKDIR) $(lispdir); else true; fi ;
 	$(CP) $(LISPC) $(LISPF) $(LISPO) $(lispdir)
+	perl -i -pe 's/^(\(defconst org-git-version ).*/\1 "$(GITVERSION)"/;' $(lispdir)/org.el
+	$(MAKE) $(lispdir)/org.elc
 
 clean:
 	$(RM) $(LISPC)

lisp/org.el

@@ -212,6 +212,10 @@ identifier."
 (defconst org-version "7.8.09"
   "The version number of the file org.el.")
 
+(defconst org-git-version "N/A"
+  "The Git version of org-mode.  Inserted by installing org-mode
+  or when a release is made.")
+
 ;;;###autoload
 (defun org-version (&optional here)
   "Show the org-mode version in the echo area.
@@ -219,7 +223,7 @@ With prefix arg HERE, insert it at point."
   (interactive "P")
   (let* ((origin default-directory)
 	 (version org-version)
-	 (git-version)
+	 (git-version org-git-version)
 	 (dir (concat (file-name-directory (locate-library "org")) "../" )))
     (when (and (file-exists-p (expand-file-name ".git" dir))
 	       (executable-find "git"))
@@ -232,12 +236,11 @@ With prefix arg HERE, insert it at point."
 		(setq git-version (buffer-substring (point) (point-at-eol))))
 	      (subst-char-in-string ?- ?. git-version t)
 	      (when (string-match "\\S-"
-				  (shell-command-to-string
-				   "git diff-index --name-only HEAD --"))
+				  (shell-command-to-string "git status -uno --porcelain"))
 		(setq git-version (concat git-version ".dirty")))
 	      (setq version (concat version " (" git-version ")"))))
 	(cd origin)))
-    (setq version (format "Org-mode version %s" version))
+    (setq version (format "Org-mode version %s (%s)" version git-version))
     (if here (insert version))
     (message version)))