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* [PATCH] Implement history facility for org-occur searches
@ 2011-08-23 23:47 Suvayu Ali
  2011-10-06  7:54 ` Carsten Dominik
  0 siblings, 1 reply; 5+ messages in thread
From: Suvayu Ali @ 2011-08-23 23:47 UTC (permalink / raw)
  To: Org mode mailing list

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Hi Bastien and everyone,

I wanted to implement a history facility for sparse trees. Since sparse
trees use org-occur and org-scan-tags any such facility would need to
be aware of both functions. My lisp foo proved to be too weak to
understand org-scan-tags, so I implemented this only for org-occur

With this patch one can traverse the sparse tree history for date,
regular expression and TODO keyword searches with the
org-occur-history-forward and org-occur-history-backward functions. One
can also call the org-occur-history-next function interactively to jump
to the nth history entry. This should also work for any other searches
that uses org-occur as the backend.

Please feel free to modify the patch if there are better ways to
implement this facility. Thank you.


Open source is the future. It sets us free.

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From 11c36f42d1471629fd783aaf1db4aaf3d1d01ef6 Mon Sep 17 00:00:00 2001
From: Suvayu Ali <fatkasuvayu+linux@gmail.com>
Date: Tue, 23 Aug 2011 14:25:08 +0200
Subject: [PATCH] Implement history facility for org-occur searches

Changed function:
* org.el (org-occur): Add history functionality and corresponding

New functions:
* org.el (org-occur-history-next): Function for history traversal
  (org-occur-history-forward) and (org-occur-history-backward):
  User funtions for moving forward and backward in search history

New variables:
* org.el (org-occur-match-history): Search history variable
  (org-occur-match-history-len): Search history size
 lisp/org.el |   65 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 files changed, 63 insertions(+), 2 deletions(-)

diff --git a/lisp/org.el b/lisp/org.el
index bbc6a75..d419a04 100644
--- a/lisp/org.el
+++ b/lisp/org.el
@@ -12294,6 +12294,15 @@ (defvar org-occur-parameters nil
 as well.")
 (make-variable-buffer-local 'org-occur-parameters)
+;;;; Org occur history variables
+(defvar org-occur-match-history nil
+  "History list of `org-occur' searches.")
+(make-variable-buffer-local 'org-occur-match-history)
+(defcustom org-occur-match-history-len 10
+  "Length of `org-occur-match-history'."
+  :type 'integer
+  :group 'org)
 (defun org-occur (regexp &optional keep-previous callback)
   "Make a compact tree which shows all matches of REGEXP.
 The tree will show the lines where the regexp matches, and all higher
@@ -12303,7 +12312,15 @@ (defun org-occur (regexp &optional keep-previous callback)
 call to `org-occur' will be kept, to allow stacking of calls to this
 If CALLBACK is non-nil, it is a function which is called to confirm
-that the match should indeed be shown."
+that the match should indeed be shown.
+The org-occur search history is stored in the variable
+`org-occur-match-history'. The length of the history is determined by the
+variable `org-occur-match-history-len'. The function
+`org-occur-history-next' can be used to traverse the org-occur history.
+Two user functions `org-occur-history-forward' and
+`org-occur-history-backward' are provided to conveniently traverse the
+org-occur history one step at a time."
   (interactive "sRegexp: \nP")
   (when (equal regexp "")
     (error "Regexp cannot be empty"))
@@ -12322,7 +12339,17 @@ (defun org-occur (regexp &optional keep-previous callback)
 		  (save-match-data (funcall callback)))
 	  (setq cnt (1+ cnt))
 	  (when org-highlight-sparse-tree-matches
-	    (org-highlight-new-match (match-beginning 0) (match-end 0)))
+	    (org-highlight-new-match (match-beginning 0) (match-end 0))
+	    ;; remove duplicate element
+	    (setq org-occur-match-history
+		  (delete regexp org-occur-match-history))
+	    ;; add last search at the front
+	    (add-to-list 'org-occur-match-history regexp)
+	    ;; curtail history to max history length
+	    (if (eq org-occur-match-history-len
+		    (length org-occur-match-history))
+		(setq org-occur-match-history
+		      (butlast org-occur-match-history))))
 	  (org-show-context 'occur-tree))))
     (when org-remove-highlights-with-change
       (org-add-hook 'before-change-functions 'org-remove-occur-highlights
@@ -12360,6 +12387,40 @@ (defun org-occur-next-match (&optional n reset)
       (goto-char p1)
       (error "No more matches"))))
+(defun org-occur-history-next (steps)
+    "Traverse org occur history by STEPS steps in the forward direction
+with respect to the current position. The search history is saved after
+removing any duplicate searches. It is reordered to reflect the most
+recent search. Before traversing the history the following transformation
+is applied: STEPS MODULO `org-occur-match-history-len'.
+For negative STEPS, history traversal is done in the backward direction
+starting at the end of the history list. When called interactively it
+prompts for the number of steps."
+    (interactive "NSteps: ")
+    (let (match)
+      (if (< steps 0)
+	  (setq match
+		(car (last org-occur-match-history
+			   (mod (- steps) org-occur-match-history-len))))
+	(setq match (nth (mod steps org-occur-match-history-len)
+			 org-occur-match-history)))
+      (org-occur match)
+      (setq org-occur-match-history
+	    (delete match org-occur-match-history))
+      (add-to-list 'org-occur-match-history match t)))
+(defun org-occur-history-forward ()
+  "Repeat last org occur search."
+  (interactive)
+  (let ((steps (if org-occur-highlights 1 0)))
+    (org-occur-history-next steps)))
+(defun org-occur-history-backward ()
+  "Repeat last org occur search."
+  (interactive)
+  (org-occur-history-next -1))
 (defun org-show-context (&optional key)
   "Make sure point and context are visible.
 How much context is shown depends upon the variables

^ permalink raw reply related	[flat|nested] 5+ messages in thread

end of thread, other threads:[~2011-10-10 18:46 UTC | newest]

Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2011-08-23 23:47 [PATCH] Implement history facility for org-occur searches Suvayu Ali
2011-10-06  7:54 ` Carsten Dominik
2011-10-10  7:47   ` suvayu ali
2011-10-10 18:16     ` Carsten Dominik
2011-10-10 18:46       ` suvayu ali

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