Re: [PATCH] allow for multiline headers

[Mario Frasca <mario@anche.no>]

[-- Attachment #1: Type: text/plain, Size: 73 bytes --]

what about these two groups of tests, and the header collapse function?


[-- Attachment #2: 0001-lisp-org-table.el-Allow-collapsing-header-into-singl.patch --]
[-- Type: text/x-patch, Size: 6052 bytes --]

From ceb21024159a75dbdb9fef32eebe1fc8c7076d2f Mon Sep 17 00:00:00 2001
From: mfrasca <mario@anche.no>
Date: Fri, 12 Jun 2020 11:42:34 -0500
Subject: [PATCH] lisp/org-table.el: Allow collapsing header into single line

* lisp/org-table.el (org-table-collapse-header): new function that
collapses multiple header lines into one list.

* lisp/org-plot.el (org-plot/gnuplot): use org-table-collapse-header
and trust there will be no more leading `hline' symbols in lisp table.

* testing/lisp/test-org-table.el (test-org-table/to-lisp):
adding tests to already existing to-lisp function.
(test-org-table/collapse-header): adding tests to new
collapse-header function.
---
 lisp/org-plot.el               |  6 ++--
 lisp/org-table.el              | 27 ++++++++++++++++
 testing/lisp/test-org-table.el | 58 ++++++++++++++++++++++++++++++++++
 3 files changed, 87 insertions(+), 4 deletions(-)

diff --git a/lisp/org-plot.el b/lisp/org-plot.el
index a23195d2a..662d38e54 100644
--- a/lisp/org-plot.el
+++ b/lisp/org-plot.el
@@ -289,11 +289,9 @@ line directly before or after the table."
 	(setf params (plist-put params (car pair) (cdr pair)))))
     ;; collect table and table information
     (let* ((data-file (make-temp-file "org-plot"))
-	   (table (org-table-to-lisp))
-	   (num-cols (length (if (eq (nth 0 table) 'hline) (nth 1 table)
-			       (nth 0 table)))))
+	   (table (org-table-collapse-header (org-table-to-lisp)))
+	   (num-cols (length (nth 0 table))))
       (run-with-idle-timer 0.1 nil #'delete-file data-file)
-      (while (eq 'hline (car table)) (setf table (cdr table)))
       (when (eq (cadr table) 'hline)
 	(setf params
 	      (plist-put params :labels (nth 0 table))) ; headers to labels
diff --git a/lisp/org-table.el b/lisp/org-table.el
index 6462b99c4..c40ad5bea 100644
--- a/lisp/org-table.el
+++ b/lisp/org-table.el
@@ -5458,6 +5458,33 @@ The table is taken from the parameter TXT, or from the buffer at point."
 	  (forward-line))
         (nreverse table)))))
 
+(defun org-table-collapse-header (table &optional glue max-header-lines)
+  "Collapse the lines before 'hline into a single header.
+
+The given TABLE is a list of lists as returned by `org-table-to-lisp'.
+The leading lines before the first `hline' symbol are considered
+forming the table header.  This function collapses all leading header
+lines into a single header line, followed by the `hline' symbol, and
+the rest of the TABLE.  Header cells are GLUEd together with a space,
+or the given character."
+  (setq glue (or glue " "))
+  (setq max-header-lines (or max-header-lines 4))
+  (while (equal 'hline (car table))
+    (setq table (cdr table)))
+  (let* ((trailer table)
+	 (header-lines (cl-loop for line in table
+				until (equal line 'hline)
+				collect line
+				do (setq trailer (cdr trailer)))))
+    (if (and trailer (<= (length header-lines) max-header-lines))
+	(cons (apply #'cl-mapcar
+		     #'(lambda (&rest x)
+			 (org-trim
+			  (mapconcat #'identity x glue)))
+		     header-lines)
+	      trailer)
+      table)))
+
 (defun orgtbl-send-table (&optional maybe)
   "Send a transformed version of table at point to the receiver position.
 With argument MAYBE, fail quietly if no transformation is defined
diff --git a/testing/lisp/test-org-table.el b/testing/lisp/test-org-table.el
index 64a1b4b16..5d54f4999 100644
--- a/testing/lisp/test-org-table.el
+++ b/testing/lisp/test-org-table.el
@@ -1304,6 +1304,64 @@ See also `test-org-table/copy-field'."
       (should (string= got
 		       expect)))))
 
+;;; the initial to lisp converter
+
+(ert-deftest test-org-table/to-lisp ()
+  "Test `orgtbl-to-lisp' specifications."
+  ;; 2x2 no header
+  (should
+   (equal '(("a" "b") ("c" "d"))
+	  (org-table-to-lisp "|a|b|\n|c|d|")))
+  ;; 2x2 with 1-line header
+  (should
+   (equal '(("a" "b") hline ("c" "d"))
+	  (org-table-to-lisp "|a|b|\n|-\n|c|d|")))
+  ;; 2x4 with 2-line header
+  (should
+   (equal '(("a" "b") ("A" "B") hline ("c" "d") ("aa" "bb"))
+	  (org-table-to-lisp "|a|b|\n|A|B|\n|-\n|c|d|\n|aa|bb|")))
+  ;; leading hlines do not get stripped
+  (should
+   (equal '(hline ("a" "b") hline ("c" "d"))
+	  (org-table-to-lisp "|-\n|a|b|\n|-\n|c|d|")))
+  (should
+   (equal '(hline ("a" "b") ("c" "d"))
+	  (org-table-to-lisp "|-\n|a|b|\n|c|d|")))
+  (should
+   (equal '(hline hline hline hline ("a" "b") ("c" "d"))
+	  (org-table-to-lisp "|-\n|-\n|-\n|-\n|a|b|\n|c|d|"))))
+
+(ert-deftest test-org-table/collapse-header ()
+  "Test `orgtbl-to-lisp' specifications."
+  ;; 2x2 no header - no collapsing
+  (should
+   (equal '(("a" "b") ("c" "d"))
+	  (org-table-collapse-header (org-table-to-lisp "|a|b|\n|c|d|"))))
+  ;; 2x2 with 1-line header - no collapsing
+  (should
+   (equal '(("a" "b") hline ("c" "d"))
+	  (org-table-collapse-header (org-table-to-lisp "|a|b|\n|-\n|c|d|"))))
+  ;; 2x4 with 2-line header - collapsed
+  (should
+   (equal '(("a A" "b B") hline ("c" "d") ("aa" "bb"))
+	  (org-table-collapse-header (org-table-to-lisp "|a|b|\n|A|B|\n|-\n|c|d|\n|aa|bb|"))))
+  ;; 2x4 with 2-line header, custom glue - collapsed
+  (should
+   (equal '(("a.A" "b.B") hline ("c" "d") ("aa" "bb"))
+	  (org-table-collapse-header (org-table-to-lisp "|a|b|\n|A|B|\n|-\n|c|d|\n|aa|bb|") ".")))
+  ;; 2x4 with 2-line header, threshold 1 - not collapsed
+  (should
+   (equal '(("a" "b") ("A" "B") hline ("c" "d") ("aa" "bb"))
+	  (org-table-collapse-header (org-table-to-lisp "|a|b|\n|A|B|\n|-\n|c|d|\n|aa|bb|") nil 1)))
+  ;; 2x4 with 2-line header, threshold 2 - collapsed
+  (should
+   (equal '(("a A" "b B") hline ("c" "d") ("aa" "bb"))
+	  (org-table-collapse-header (org-table-to-lisp "|a|b|\n|A|B|\n|-\n|c|d|\n|aa|bb|") nil 2)))
+  ;; 2x8 with 6-line header, default threshold 5 - not collapsed
+  (should
+   (equal '(("a" "b") ("A" "B") ("a" "b") ("A" "B") ("a" "b") ("A" "B") hline ("c" "d") ("aa" "bb"))
+	  (org-table-collapse-header (org-table-to-lisp "|a|b|\n|A|B|\n|a|b|\n|A|B|\n|a|b|\n|A|B|\n|-\n|c|d|\n|aa|bb|")))))
+
 ;;; Radio Tables
 
 (ert-deftest test-org-table/to-generic ()
-- 
2.20.1