lisp/org-colview.el: Add link parameter to colview dynamic block

* lisp/org-colview.el (org-columns--capture-view): Add new link
parameter, which when non-nil causes ITEM headlines to be linked to
their origins.
(org-dblock-write:columnview): Pass new link parameter to
`org-columns--capture-view', and explain its use in the docstring.
* testing/lisp/test-org-colview.el (test-org-colview/dblock): Add
new test for link feature.
* doc/org-manual.org (Capturing column view): Describe new :link
parameter.
* etc/ORG-NEWS (=colview= dynamic block can link to headlines):
Describe new link feature.

doc/org-manual.org

@@ -6009,6 +6009,11 @@ This dynamic block has the following parameters:
 
   When non-~nil~, indent each =ITEM= field according to its level.
 
+- =:link= ::
+
+  When non-~nil~, link the =ITEM= headlines in the table to their
+  origins.
+
 - =:format= ::
 
   Specify a column attribute (see [[*Column attributes]]) for the dynamic

etc/ORG-NEWS

@@ -1104,6 +1104,12 @@ using the new ~:formatter~ parameter on the block's =BEGIN= line.
 This new feature replicates the ~:formatter~ option already available
 for =clocktable= dynamic blocks.
 
+*** =colview= dynamic block can link to headlines
+
+The =colview= dynamic block understands a new ~:link~ parameter, which
+when non-~nil~ causes =ITEM= headlines in the table to be linked to
+their origins.
+
 *** =ob-tangle.el=: New flag to remove tangle targets before writing
 
 When ~org-babel-tangle-remove-file-before-write~ is set to ~t~ the

lisp/org-colview.el

@@ -1557,6 +1557,10 @@ PARAMS is a property list of parameters:
     When non-nil, make each column a column group to enforce
     vertical lines.
 
+`:link'
+
+    Link the item headlines in the table to their origins.
+
 `:formatter'
 
     A function to format the data and insert it into the
@@ -1599,9 +1603,10 @@ PARAMS is a property list of parameters:
 TABLE is a table with data as produced by `org-columns--capture-view'.
 PARAMS is the parameter property list obtained from the dynamic block
 definition."
-  (let ((width-specs
-         (mapcar (lambda (spec) (nth 2 spec))
-                 org-columns-current-fmt-compiled)))
+  (let ((link (plist-get params :link))
+	(width-specs
+	 (mapcar (lambda (spec) (nth 2 spec))
+		 org-columns-current-fmt-compiled)))
     (when table
       ;; Prune level information from the table.  Also normalize
       ;; headings: remove stars, add indentation entities, if
@@ -1625,7 +1630,14 @@ definition."
 			   (and (numberp hlines) (<= level hlines))))
 	      (push 'hline new-table))
 	    (when item-index
-	      (let ((item (org-columns--clean-item (nth item-index (cdr row)))))
+	      (let* ((raw (nth item-index (cdr row)))
+		     (cleaned (org-columns--clean-item raw))
+		     (item (if (not link) cleaned
+			     (let ((search (org-link-heading-search-string raw)))
+			       (org-link-make-string
+				(if (not (buffer-file-name)) search
+				  (format "file:%s::%s" (buffer-file-name) search))
+				cleaned)))))
 		(setf (nth item-index (cdr row))
 		      (if (and indent (> level 1))
 			  (concat "\\_" (make-string (* 2 (1- level)) ?\s) item)

testing/lisp/test-org-colview.el

@@ -1723,6 +1723,18 @@ there are 4 parameters
      "* H\n<point>#+BEGIN: columnview :formatter test-org-colview/dblock-formatter\n#+END:"
      (let ((org-columns-default-format "%ITEM"))
        (org-update-dblock))
+     (buffer-substring-no-properties (point) (point-max)))))
+  ;; test headline linkification
+  (should
+   (equal
+    "#+BEGIN: columnview :link t
+| ITEM |
+|------|
+| [[*H][H]]    |
+#+END:"
+    (org-test-with-temp-text
+     "* H\n<point>#+BEGIN: columnview :link t\n#+END:"
+     (let ((org-columns-default-format "%ITEM")) (org-update-dblock))
      (buffer-substring-no-properties (point) (point-max))))))
 
 (provide 'test-org-colview)