From c205e8ffaefbc7c28e0ac48108fa4d1b69c1f104 Mon Sep 17 00:00:00 2001
From: David Edmondson <dme@dme.org>
Date: Wed, 8 Feb 2012 08:02:14 +0000
Subject: [PATCH] emacs: Allow the indentation of content to be toggled.

Very deeply indented content is sometimes difficult to
read (particular for something like patches). Allow the indentation of
the content to be toggled with '<'.

Indentation of the header lines is not affected, so it remains
possible to see the structure of the thread.
---
 emacs/notmuch-show.el | 26 ++++++++++++++++++++++----
 1 file changed, 22 insertions(+), 4 deletions(-)

diff --git a/emacs/notmuch-show.el b/emacs/notmuch-show.el
index c8371e75..60fd2171 100644
--- a/emacs/notmuch-show.el
+++ b/emacs/notmuch-show.el
@@ -146,6 +146,10 @@ indentation."
 (make-variable-buffer-local 'notmuch-show-elide-non-matching-messages)
 (put 'notmuch-show-elide-non-matching-messages 'permanent-local t)
 
+(defvar notmuch-show-indent-content t)
+(make-variable-buffer-local 'notmuch-show-indent-content)
+(put 'notmuch-show-indent-content 'permanent-local t)
+
 (defmacro with-current-notmuch-show-message (&rest body)
   "Evaluate body with current buffer set to the text of current message"
   `(save-excursion
@@ -256,10 +260,12 @@ operation on the contents of the current buffer."
 	 (all (buffer-substring (notmuch-show-message-top)
 				(notmuch-show-message-bottom)))
 
-	 (props (notmuch-show-get-message-properties)))
+	 (props (notmuch-show-get-message-properties))
+	 (indenting notmuch-show-indent-content))
     (with-temp-buffer
       (insert all)
-      (indent-rigidly (point-min) (point-max) (- depth))
+      (if indenting
+	  (indent-rigidly (point-min) (point-max) (- depth)))
       ;; Remove the original header.
       (goto-char (point-min))
       (re-search-forward "^$" (point-max) nil)
@@ -900,7 +906,8 @@ current buffer, if possible."
     (setq body-start (point-marker))
     ;; A blank line between the headers and the body.
     (insert "\n")
-    (notmuch-show-insert-body msg (plist-get msg :body) depth)
+    (notmuch-show-insert-body msg (plist-get msg :body)
+			      (if notmuch-show-indent-content depth 0))
     ;; Ensure that the body ends with a newline.
     (unless (bolp)
       (insert "\n"))
@@ -908,7 +915,8 @@ current buffer, if possible."
     (setq content-end (point-marker))
 
     ;; Indent according to the depth in the thread.
-    (indent-rigidly content-start content-end (* notmuch-show-indent-messages-width depth))
+    (if notmuch-show-indent-content
+	(indent-rigidly content-start content-end (* notmuch-show-indent-messages-width depth)))
 
     (setq message-end (point-max-marker))
 
@@ -955,6 +963,15 @@ current buffer, if possible."
 	     "Showing all messages."))
   (notmuch-show-refresh-view))
 
+(defun notmuch-show-toggle-thread-indentation ()
+  "Toggle the indentation of threads."
+  (interactive)
+  (setq notmuch-show-indent-content (not notmuch-show-indent-content))
+  (message (if notmuch-show-indent-content
+	       "Content is indented."
+	     "Content is not indented."))
+  (notmuch-show-refresh-view))
+
 (defun notmuch-show-insert-tree (tree depth)
   "Insert the message tree TREE at depth DEPTH in the current thread."
   (let ((msg (car tree))
@@ -1119,6 +1136,7 @@ Refreshes the current view, observing changes in cryptographic preferences."
 	(define-key map "#" 'notmuch-show-print-message)
 	(define-key map "!" 'notmuch-show-toggle-elide-non-matching)
 	(define-key map "$" 'notmuch-show-toggle-process-crypto)
+	(define-key map "<" 'notmuch-show-toggle-thread-indentation)
 	map)
       "Keymap for \"notmuch show\" buffers.")
 (fset 'notmuch-show-mode-map notmuch-show-mode-map)
-- 
2.26.2