[PATCH 2/4] Allow an explicitly nil :tstart and :tend to suppress the strings.

[Jason Riedy <jason@acm.org>]

Passing explicit nils to leave out start and end strings feels
natural.  Also, transforming org-mode tables into other org-mode
tables can use :tstart and :tend to specify directives, so I
don't want to change the default splice setting for those.

Signed-off-by: Jason Riedy <jason@acm.org>
---
 ChangeLog         |    2 ++
 lisp/org-table.el |   12 ++++++++----
 2 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 69710ec..d70bc98 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -3,6 +3,8 @@
 	* lisp/org-table.el (*orgtbl-default-fmt*): New variable.
 	(orgtbl-format-line): Use the value of *orgtbl-default-fmt*
 	when there is no other fmt available.
+	(orgtbl-to-generic): Allow an explicitly nil :tstart or
+	:tend to suppress the appropriate string.
 
 2008-05-02  Carsten Dominik  <dominik@science.uva.nl>
 
diff --git a/lisp/org-table.el b/lisp/org-table.el
index 17441cd..19dd74a 100644
--- a/lisp/org-table.el
+++ b/lisp/org-table.el
@@ -3773,8 +3773,10 @@ directly by `orgtbl-send-table'.  See manual."
 
     ;; Put header
     (unless splicep
-      (push (or (orgtbl-eval-str (plist-get params :tstart))
-		"ERROR: no :tstart") *orgtbl-rtn*))
+      (if (not (plist-member params :tstart))
+          (push "ERROR: no :tstart" *orgtbl-rtn*)
+        (let ((tstart (orgtbl-eval-str (plist-get params :tstart))))
+          (if tstart (push tstart *orgtbl-rtn*)))))
 
     ;; Do we have a heading section?  If so, format it and handle the
     ;; trailing hline.
@@ -3801,8 +3803,10 @@ directly by `orgtbl-send-table'.  See manual."
     (orgtbl-format-section nil)
 
     (unless splicep
-      (push (or (orgtbl-eval-str (plist-get params :tend))
-		"ERROR: no :tend") *orgtbl-rtn*))
+      (if (not (plist-member params :tend))
+          (push "ERROR: no :tend" *orgtbl-rtn*)
+        (let ((tend (orgtbl-eval-str (plist-get params :tend))))
+          (if tend (push tend *orgtbl-rtn*)))))
 
     (mapconcat 'identity (nreverse (if remove-nil-linesp
 				       (remq nil *orgtbl-rtn*)
-- 
1.5.5.rc1.121.g1594