git-email: Add function for matching git-email buffers.

A user might have buffers with unsent messages that were not generated
by git-email, previously, invoking ‘git-email-send-all’ would
unconditionally send all of those messages.  By using a predicate, we
make sure to only send messages generated by git-email.

* git-email.el (git-email-buffer-p-function): New defcustom.
(git-email-buffer-p): New function.
(git-email-send-all): Use it.
* doc/git-email.texi (Miscellaneous): Document it.

Signed-off-by: Xinglu Chen <public@yoctocell.xyz>

2 files changed, 32 insertions, 4 deletions

diff --git a/doc/git-email.texi b/doc/git-email.texi
index f290878..09db2b1 100644
--- a/doc/git-email.texi
+++ b/doc/git-email.texi
@@ -304,6 +304,15 @@ trailing @samp{/}.
 names are generated.  See the documentation for
 @code{message-generate-new-buffers} for more information.
 
+@vindex git-email-buffer-p-function
+@item
+If you have changed the default value of
+@code{git-email-generate-message-buffer}, you probably also want to
+change the value of @code{git-email-buffer-p-function}.  It should be a
+function that takes one argument---the name of a buffer, and returns
+@code{t} if the buffer contains an unsent patch generated using
+@samp{git-email}.
+
 By default the name will have the following format @samp{git-email
 unsent patch to *** TO ADDRESS HERE *** *}.
 @end itemize
diff --git a/git-email.el b/git-email.el
index cef8340..27b6238 100644
--- a/git-email.el
+++ b/git-email.el
@@ -175,6 +175,15 @@ HERE *** *\"."
   :group 'git-email
   :package-version '(git-email . "0.3.0"))
 
+(defcustom git-email-buffer-p-function
+  #'git-email-buffer-p
+  "Function used for determining if a buffer contains an unsent
+patch based on the buffer name.  The function must take one
+argument --- the buffer name."
+  :type 'function
+  :group 'git-email
+  :package-version '(git-email . "0.3.0"))
+
 ;; Remove Compiler warnings
 (declare-function dired-get-filename "dired.el")
 (declare-function dired-map-over-marks "dired.el")
@@ -465,6 +474,13 @@ default behavior is to delete them after sending the message."
   (generate-new-buffer-name
    (concat "*git-email unsent patch to " address " *" )))
 
+(defun git-email-buffer-p (name)
+  "Check whether a buffer is contains an unsent patch based on its
+NAME."
+  (if (string-match "git-email-unsent-patch" name)
+      t
+    nil))
+
 
 ;;;; Operate on emails
 
@@ -480,14 +496,17 @@ default behavior is to delete them after sending the message."
       (> old new))))
 
 (defun git-email-send-all ()
-  "Send all unsent emails."
+  "Send all unsent patches."
   (interactive)
   ;; Sort the buffers so that [PATCH 0/N] comes first, this prevents
   ;; the ordering from getting messed up.
-  (let ((buffers (sort (message-buffers) #'git-email-message-buffer-greaterp)))
-    (mapc (lambda (b) (switch-to-buffer b)
+  (let* ((message-buffers (seq-filter #'git-email-buffer-p
+                                  (message-buffers)) )
+         (sorted-buffers (sort message-buffers #'git-email-message-buffer-greaterp)))
+    (mapc (lambda (b)
+            (switch-to-buffer b)
             (funcall git-email-send-email-function))
-          buffers)))
+          sorted-buffers)))
 
 (defun git-email--rewrite-header-in-buffer (buffer header value append)
   (switch-to-buffer buffer)