[PATCH v2 2/3] emacs: use a single history for all searches

[Dmitry Kurochkin]

There are two ways to do search in Emacs UI: search widget in
notmuch-hello buffer and `notmuch-search' function bound to "s".
Before the change, these search mechanisms used different history
lists.  The patch makes notmuch-hello search use the same history list
as `notmuch-search' function.
---
 emacs/notmuch-hello.el |   49 ++++++++++++++---------------------------------
 emacs/notmuch-lib.el   |    9 ++++++++
 emacs/notmuch.el       |   19 ++++++++++++-----
 3 files changed, 37 insertions(+), 40 deletions(-)

diff --git a/emacs/notmuch-hello.el b/emacs/notmuch-hello.el
index 08fcd22..cb36977 100644
--- a/emacs/notmuch-hello.el
+++ b/emacs/notmuch-hello.el
@@ -29,8 +29,8 @@
 (declare-function notmuch-search "notmuch" (query &optional oldest-first target-thread target-line continuation))
 (declare-function notmuch-poll "notmuch" ())
 
-(defcustom notmuch-recent-searches-max 10
-  "The number of recent searches to store and display."
+(defcustom notmuch-hello-recent-searches-max 10
+  "The number of recent searches to display."
   :type 'integer
   :group 'notmuch)
 
@@ -151,16 +151,6 @@ International Bureau of Weights and Measures."
 (defvar notmuch-hello-url "http://notmuchmail.org"
   "The `notmuch' web site.")
 
-(defvar notmuch-hello-recent-searches nil)
-
-(defun notmuch-hello-remember-search (search)
-  (setq notmuch-hello-recent-searches
-	(delete search notmuch-hello-recent-searches))
-  (push search notmuch-hello-recent-searches)
-  (if (> (length notmuch-hello-recent-searches)
-	 notmuch-recent-searches-max)
-      (setq notmuch-hello-recent-searches (butlast notmuch-hello-recent-searches))))
-
 (defun notmuch-hello-nice-number (n)
   (let (result)
     (while (> n 0)
@@ -173,16 +163,9 @@ International Bureau of Weights and Measures."
 	      (format "%s%03d" notmuch-hello-thousands-separator elem))
 	     (cdr result)))))
 
-(defun notmuch-hello-trim (search)
-  "Trim whitespace."
-  (if (string-match "^[[:space:]]*\\(.*[^[:space:]]\\)[[:space:]]*$" search)
-      (match-string 1 search)
-    search))
-
 (defun notmuch-hello-search (search)
-  (let ((search (notmuch-hello-trim search)))
-    (notmuch-hello-remember-search search)
-    (notmuch-search search notmuch-search-oldest-first nil nil #'notmuch-hello-search-continuation)))
+  (notmuch-search search notmuch-search-oldest-first nil nil
+		  #'notmuch-hello-search-continuation))
 
 (defun notmuch-hello-add-saved-search (widget)
   (interactive)
@@ -461,7 +444,7 @@ Complete list of currently available key bindings:
 
     (let ((found-target-pos nil)
 	  (final-target-pos nil)
-	  (search-bar-pos))
+	  (default-pos))
       (let* ((saved-alist
 	      ;; Filter out empty saved searches if required.
 	      (if notmuch-show-empty-saved-searches
@@ -493,7 +476,7 @@ Complete list of currently available key bindings:
 	    (indent-rigidly start (point) notmuch-hello-indent)))
 
 	(widget-insert "\nSearch: ")
-	(setq search-bar-pos (point-marker))
+	(setq default-pos (point-marker))
 	(widget-create 'editable-field
 		       ;; Leave some space at the start and end of the
 		       ;; search boxes.
@@ -507,18 +490,18 @@ Complete list of currently available key bindings:
 	(put-text-property (1- (point)) (point) 'invisible t)
 	(widget-insert "\n")
 
-	(when notmuch-hello-recent-searches
+	(when notmuch-search-history
 	  (widget-insert "\nRecent searches: ")
 	  (widget-create 'push-button
 			 :notify (lambda (&rest ignore)
-				   (setq notmuch-hello-recent-searches nil)
+				   (setq notmuch-search-history nil)
 				   (notmuch-hello-update))
 			 "clear")
 	  (widget-insert "\n\n")
-	  (let ((start (point))
-		(nth 0))
-	    (mapc (lambda (search)
-		    (let ((widget-symbol (intern (format "notmuch-hello-search-%d" nth))))
+	  (let ((start (point)))
+	    (loop for i from 1 to notmuch-hello-recent-searches-max
+		  for search in notmuch-search-history do
+		    (let ((widget-symbol (intern (format "notmuch-hello-search-%d" i))))
 		      (set widget-symbol
 			   (widget-create 'editable-field
 					  ;; Don't let the search boxes be
@@ -545,9 +528,7 @@ Complete list of currently available key bindings:
 					       (notmuch-hello-add-saved-search widget))
 				     :notmuch-saved-search-widget widget-symbol
 				     "save"))
-		    (widget-insert "\n")
-		    (setq nth (1+ nth)))
-		  notmuch-hello-recent-searches)
+		    (widget-insert "\n"))
 	    (indent-rigidly start (point) notmuch-hello-indent)))
 
 	(when alltags-alist
@@ -576,7 +557,7 @@ Complete list of currently available key bindings:
       (let ((start (point)))
 	(widget-insert "\n\n")
 	(widget-insert "Type a search query and hit RET to view matching threads.\n")
-	(when notmuch-hello-recent-searches
+	(when notmuch-search-history
 	  (widget-insert "Hit RET to re-submit a previous search. Edit it first if you like.\n")
 	  (widget-insert "Save recent searches with the `save' button.\n"))
 	(when notmuch-saved-searches
@@ -594,7 +575,7 @@ Complete list of currently available key bindings:
 	  (widget-forward 1)))
 
       (unless (widget-at)
-	(goto-char search-bar-pos))))
+	(goto-char default-pos))))
 
   (run-hooks 'notmuch-hello-refresh-hook))
 
diff --git a/emacs/notmuch-lib.el b/emacs/notmuch-lib.el
index 0f856bf..dfbc2e0 100644
--- a/emacs/notmuch-lib.el
+++ b/emacs/notmuch-lib.el
@@ -35,6 +35,9 @@
 
 ;;
 
+(defvar notmuch-search-history nil
+  "Variable to store notmuch searches history.")
+
 (defcustom notmuch-saved-searches nil
   "A list of saved searches to display."
   :type '(alist :key-type string :value-type string)
@@ -114,6 +117,12 @@ the user hasn't set this variable with the old or new value."
       (setq list (cdr list)))
     (nreverse out)))
 
+(defun notmuch-trim (search)
+  "Trim whitespaces."
+  (if (string-match "^[[:space:]]*\\(.*[^[:space:]]\\)[[:space:]]*$" search)
+      (match-string 1 search)
+    search))
+
 ; This lets us avoid compiling these replacement functions when emacs
 ; is sufficiently new enough to supply them alone. We do the macro
 ; treatment rather than just wrapping our defun calls in a when form
diff --git a/emacs/notmuch.el b/emacs/notmuch.el
index ef4dcc7..450c0c1 100644
--- a/emacs/notmuch.el
+++ b/emacs/notmuch.el
@@ -916,21 +916,28 @@ PROMPT is the string to prompt with."
 	       (t (list string)))))))
       ;; this was simpler than convincing completing-read to accept spaces:
       (define-key keymap (kbd "<tab>") 'minibuffer-complete)
-      (read-from-minibuffer prompt nil keymap nil
-			    'notmuch-query-history nil nil))))
+      (let ((history-delete-duplicates t))
+	(read-from-minibuffer prompt nil keymap nil
+			      'notmuch-search-history nil nil)))))
 
 ;;;###autoload
-(defun notmuch-search (query &optional oldest-first target-thread target-line continuation)
-  "Run \"notmuch search\" with the given query string and display results.
+(defun notmuch-search (&optional query oldest-first target-thread target-line continuation)
+  "Run \"notmuch search\" with the given `query' and display results.
 
-The optional parameters are used as follows:
+If `query' is nil, it is read interactively from the minibuffer.
+Other optional parameters are used as follows:
 
   oldest-first: A Boolean controlling the sort order of returned threads
   target-thread: A thread ID (with the thread: prefix) that will be made
                  current if it appears in the search results.
   target-line: The line number to move to if the target thread does not
                appear in the search results."
-  (interactive (list (notmuch-read-query "Notmuch search: ")))
+  (interactive)
+  (if (null query)
+      (setq query (notmuch-read-query "Notmuch search: "))
+    (setq query (notmuch-trim query))
+    (let ((history-delete-duplicates t))
+      (add-to-history 'notmuch-search-history query)))
   (let ((buffer (get-buffer-create (notmuch-search-buffer-title query))))
     (switch-to-buffer buffer)
     (notmuch-search-mode)
-- 
1.7.8.3