From 148d084ef100fb4ca32f8f19e36d4dcbe643b6b4 Mon Sep 17 00:00:00 2001
From: stardiviner <numbchild@gmail.com>
Date: Sun, 8 Apr 2018 20:56:28 +0800
Subject: [PATCH 1/2] ob-core.el: add "link" :results format for babel.

* lisp/ob-core.el (org-babel-execute-src-block): handle "link" :results
  format. Don't write result to :file specified file.

* etc/ORG-NEWS: declare new "link" :results format.

* doc/org-manual.org: add document for new result format "link".

* testing/lisp/test-ob.el (test-ob/result-file-link-type-header-argument):
  Add test for new added :results format "link".
---
 doc/org-manual.org      | 12 ++++++++++++
 etc/ORG-NEWS            |  9 +++++++++
 lisp/ob-core.el         | 12 ++++++------
 testing/lisp/test-ob.el | 16 ++++++++++++++++
 4 files changed, 43 insertions(+), 6 deletions(-)

diff --git a/doc/org-manual.org b/doc/org-manual.org
index d787e5da4..afd968a38 100644
--- a/doc/org-manual.org
+++ b/doc/org-manual.org
@@ -17224,6 +17224,18 @@ follows from the type specified above.
      =raw= or =org= results for later scripting and automated
      processing.  Usage example: =:results value drawer=.
 
+- =link= ::
+
+     #+cindex: @samp{link}, header argument
+     When this result type used with header argument =:file=. Generate a
+     link to =:file= specified file. Instead of writing src block
+     evaluate non-empty result to =:file= specified file. Like following
+     example:
+
+     #+begin_src shell :results link :file "download.tar.gz"
+     wget -c "http://example.com/download.tar.gz"
+     #+end_src
+
 *** Handling
 :PROPERTIES:
 :UNNUMBERED: notoc
diff --git a/etc/ORG-NEWS b/etc/ORG-NEWS
index 0edd77115..3833b57b2 100644
--- a/etc/ORG-NEWS
+++ b/etc/ORG-NEWS
@@ -113,6 +113,15 @@ now sort according to the locale’s collation rules instead of by
 code-point.
 
 ** New features
+*** Add ~:results link~ support for org-babel
+This will support only insert file link without writing result to file.
+Like this case:
+#+begin_src shell :dir "data/tmp" :results link :file "crackzor_1.0.c.gz"
+wget -c "http://ben.akrin.com/crackzor/crackzor_1.0.c.gz"
+#+end_src
+
+#+RESULTS:
+[[file:data/tmp/crackzor_1.0.c.gz]]
 *** Add ~:session~ support of ob-js for js-comint
 #+begin_src js :session "*Javascript REPL*"
 console.log("stardiviner")
diff --git a/lisp/ob-core.el b/lisp/ob-core.el
index 129e17f62..2b72d7b32 100644
--- a/lisp/ob-core.el
+++ b/lisp/ob-core.el
@@ -414,7 +414,7 @@ then run `org-babel-switch-to-session'."
     (post       . :any)
     (prologue   . :any)
     (results	. ((file list vector table scalar verbatim)
-		   (raw html latex org code pp drawer)
+		   (raw html latex org code pp drawer link)
 		   (replace silent none append prepend)
 		   (output value)))
     (rownames	. ((no yes)))
@@ -706,11 +706,11 @@ block."
 	      (let ((file (cdr (assq :file params))))
 		;; If non-empty result and :file then write to :file.
 		(when file
-		  (let ((graphics?
-			 (member "graphics" (cdr (assq :result-params params)))))
-		    ;; Handle :results graphics :file case.  Don't
-		    ;; write result to file if result is graphics.
-		    (when (and result (not graphics?))
+		  (let ((graphics? (member "graphics" (cdr (assq :result-params params))))
+			(file-link? (member "link" (cdr (assq :result-params params)))))
+		    ;; If :results are special types like `link', `graphics' etc.
+		    ;; don't write result to `:file'. Literately only insert link to :file.
+		    (when (and result (not graphics?) (not file-link?))
 		      (with-temp-file file
 			(insert (org-babel-format-result
 				 result (cdr (assq :sep params)))))))
diff --git a/testing/lisp/test-ob.el b/testing/lisp/test-ob.el
index a4a590d6a..e541ad726 100644
--- a/testing/lisp/test-ob.el
+++ b/testing/lisp/test-ob.el
@@ -996,6 +996,22 @@ trying to find the :END: marker."
     (should (search-forward "[[file:foo][bar]]" nil t))
     (should (search-forward "[[file:foo][foo]]" nil t))))
 
+(ert-deftest test-ob/result-file-link-type-header-argument ()
+  "Ensure that the result is a link to a file.
+The file is just a link to :file value. Inhibit non-empty result write to :file."
+  (org-test-with-temp-text "#+begin_src shell :results value link :file \"/tmp/test.txt\"
+echo \"hello\" > /tmp/test.txt
+echo \"test\"
+#+end_src"
+   (org-babel-execute-src-block)
+   (goto-char (point-min))
+   (should (search-forward "[[file:/tmp/test.txt]]" nil nil))
+   (should (with-temp-buffer
+   	     (insert-file-contents "/tmp/test.txt")
+   	     (string=
+   	      "hello\n"
+   	      (buffer-substring-no-properties (point-min) (point-max)))))))
+
 (ert-deftest test-ob/inline-src_blk-preceded-punct-preceded-by-point ()
   (let ((test-line ".src_emacs-lisp[ :results verbatim ]{ \"x\"  }")
 	(org-babel-inline-result-wrap "=%s="))
-- 
2.17.0