[PATCH 1/2] notmuch-show-get-header: new function; return alist of parsed header fields.

[david@tethera.net]

From: David Bremner <bremner@unb.ca>

This function parses the displayed message to recover header
fields. It uses mailheader.el to do the actual header parsing, after
preprocessing to remove indentation.  It relies on the variables
notmuch-show-message-begin-regexp, notmuch-show-header-begin-regexp,
and notmuch-show-message-end-regexp.
---
 notmuch.el |   24 ++++++++++++++++++++++++
 1 files changed, 24 insertions(+), 0 deletions(-)

diff --git a/notmuch.el b/notmuch.el
index c0bb552..c96fd94 100644
--- a/notmuch.el
+++ b/notmuch.el
@@ -225,6 +225,30 @@ Unlike builtin `previous-line' this version accepts no arguments."
     (re-search-forward notmuch-show-tags-regexp)
     (split-string (buffer-substring (match-beginning 1) (match-end 1)))))
 
+(defun notmuch-show-get-header ()
+  "Retrieve and parse the header from the current message. Returns an alist with of (header . value) 
+where header is a symbol and value is a string.  The summary from notmuch-show is returned as the 
+pseudoheader summary"
+  (require 'mailheader)
+  (save-excursion
+    (beginning-of-line)
+    (if (not (looking-at notmuch-show-message-begin-regexp))
+	(re-search-backward notmuch-show-message-begin-regexp))
+    (re-search-forward (concat notmuch-show-header-begin-regexp "\n[[:space:]]*\\(.*\\)\n"))
+    (let* ((summary (buffer-substring-no-properties (match-beginning 1) (match-end 1)))
+	  (beg (point)))
+      (re-search-forward notmuch-show-header-end-regexp)
+      (let ((text (buffer-substring beg (match-beginning 0))))
+	(with-temp-buffer
+	  (insert text)
+	  (goto-char (point-min))
+	  (while (looking-at "\\([[:space:]]*\\)[A-Za-z][-A-Za-z0-9]*:")
+	    (delete-region (match-beginning 1) (match-end 1))
+	    (forward-line)
+	    )
+	  (goto-char (point-min))
+	  (cons (cons 'summary summary) (mail-header-extract-no-properties)))))))
+  
 (defun notmuch-show-add-tag (&rest toadd)
   "Add a tag to the current message."
   (interactive
-- 
1.6.5