[Patch 2/3] Respect window margins in notmuch-hello.el

[Ivy Foster]

Hello again, folks,

The following patch makes notmuch take window margins into
account when calculating the width of the notmuch-hello
window in Emacs. As a side benefit (so that I only had to
write the code once), I've added a named function to return
said width.

Folks using linum-mode should still probably get a copy of
linum-off.el and disable linum for notmuch-hello, though,
since it doesn't set the margin until after the buffer is
done being created, causing text to overflow across the
edge. Alternately, take a look at my next message, with yet
another patch.

Enjoy!

iff

Signed-off-by: Ivy Foster <joyfulgirl at archlinux.us>
>From 0c1a0fa0858e3c22b416ce6bd9ad623198217d34 Mon Sep 17 00:00:00 2001
From: Ivy Foster <joyfulgirl at archlinux.us>
Date: Fri, 28 Oct 2011 23:18:14 -0400
Subject: [PATCH 2/3] Respect margins in new named window-width function

    This patch removes a function which is duplicated
    several times in notmuch-hello.el, improving
    readability. Also, factors in  window margins
    when calculating width.
---
 emacs/notmuch-hello.el |   28 ++++++++++++++++++----------
 1 files changed, 18 insertions(+), 10 deletions(-)

diff --git a/emacs/notmuch-hello.el b/emacs/notmuch-hello.el
index 65fde75..1a213f0 100644
--- a/emacs/notmuch-hello.el
+++ b/emacs/notmuch-hello.el
@@ -213,25 +213,27 @@ should be. Returns a cons cell `(tags-per-line width)'."
 	 (cond
 	  ((integerp notmuch-column-control)
 	   (max 1
-		(/ (- (window-width) notmuch-hello-indent)
+		(/ (notmuch-hello-available-width)
 		   ;; Count is 9 wide (8 digits plus space), 1 for the space
 		   ;; after the name.
 		   (+ 9 1 (max notmuch-column-control widest)))))
 
 	  ((floatp notmuch-column-control)
-	   (let* ((available-width (- (window-width) notmuch-hello-indent))
-		  (proposed-width (max (* available-width notmuch-column-control) widest)))
-	     (floor available-width proposed-width)))
+	   (let ((proposed-width (max
+				 (* (notmuch-hello-available-width)
+				    notmuch-column-control)
+				 widest)))
+	     (floor (notmuch-hello-available-width) proposed-width)))
 
 	  (t
 	   (max 1
-		(/ (- (window-width) notmuch-hello-indent)
+		(/ (notmuch-hello-available-width)
 		   ;; Count is 9 wide (8 digits plus space), 1 for the space
 		   ;; after the name.
 		   (+ 9 1 widest)))))))
 
     (cons tags-per-line (/ (max 1
-				(- (window-width) notmuch-hello-indent
+				(- (notmuch-hello-available-width)
 				   ;; Count is 9 wide (8 digits plus
 				   ;; space), 1 for the space after the
 				   ;; name.
@@ -458,7 +460,7 @@ Complete list of currently available key bindings:
 	(widget-create 'editable-field
 		       ;; Leave some space at the start and end of the
 		       ;; search boxes.
-		       :size (max 8 (- (window-width) notmuch-hello-indent
+		       :size (max 8 (- (notmuch-hello-available-width)
 				       (length "Search: ")))
 		       :action (lambda (widget &rest ignore)
 				 (notmuch-hello-search (widget-value widget))))
@@ -481,12 +483,13 @@ Complete list of currently available key bindings:
 				       ;; Don't let the search boxes be
 				       ;; less than 8 characters wide.
 				       :size (max 8
-						  (- (window-width)
+						  (-
+						   (notmuch-hello-available-width)
 						     ;; Leave some space
 						     ;; at the start and
 						     ;; end of the
 						     ;; boxes.
-						     (* 2 notmuch-hello-indent)
+						   notmuch-hello-indent
 						     ;; 1 for the space
 						     ;; before the
 						     ;; `[save]' button. 6
@@ -540,7 +543,7 @@ Complete list of currently available key bindings:
 	  (widget-insert "Edit saved searches with the `edit' button.\n"))
 	(widget-insert "Hit RET or click on a saved search or tag name to view matching threads.\n")
 	(widget-insert "`=' refreshes this screen. `s' jumps to the search box. `q' to quit.\n")
-	(let ((fill-column (- (window-width) notmuch-hello-indent)))
+	(let ((fill-column (notmuch-hello-available-width)))
 	  (center-region start (point))))
 
       (widget-setup)
@@ -558,6 +561,11 @@ Complete list of currently available key bindings:
   (interactive)
   (notmuch-hello))
 
+(defun notmuch-hello-available-width ()
+  (let ((left-margin (or (car (window-margins)) 0))
+	(right-margin (or (cadr (window-margins)) 0)))
+    (- (window-width) left-margin right-margin notmuch-hello-indent)))
+
 ;;
 
 (provide 'notmuch-hello)
-- 
1.7.7.1