Add new option --reply-to=(all|sender) to "notmuch reply" to select whether
to reply to all (sender and all recipients), or just sender. Reply to all
remains the default.

Credits to Mark Walters <markwalters1009 at gmail.com> for his similar earlier
work where I picked up the basic idea of handling reply-to-sender in
add_recipients_from_message(). All bugs are mine, though.

Signed-off-by: Jani Nikula <jani at nikula.org>

---

Settled on --reply-to=(all|sender) per Carl's earlier suggestion
(id:87pqn5cg4g.fsf at yoom.home.cworth.org) and David's approval on IRC.
---
 man/man1/notmuch-reply.1 |   28 +++++++++++++---
 notmuch-reply.c          |   78 ++++++++++++++++++++++++++++++++++++----------
 2 files changed, 84 insertions(+), 22 deletions(-)

diff --git a/man/man1/notmuch-reply.1 b/man/man1/notmuch-reply.1
index 099d808..21afa35 100644
--- a/man/man1/notmuch-reply.1
+++ b/man/man1/notmuch-reply.1
@@ -14,11 +14,13 @@ Constructs a reply template for a set of messages.
 To make replying to email easier,
 .B notmuch reply
 takes an existing set of messages and constructs a suitable mail
-template. The Reply-to header (if any, otherwise From:) is used for
-the To: address. Vales from the To: and Cc: headers are copied, but
-not including any of the current user's email addresses (as configured
-in primary_mail or other_email in the .notmuch\-config file) in the
-recipient list
+template. The Reply-to: header (if any, otherwise From:) is used for
+the To: address. Unless
+.BR \-\-reply-to=sender
+is specified, values from the To: and Cc: headers are copied, but not
+including any of the current user's email addresses (as configured in
+primary_mail or other_email in the .notmuch\-config file) in the
+recipient list.

 It also builds a suitable new subject, including Re: at the front (if
 not already present), and adding the message IDs of the messages being
@@ -45,6 +47,22 @@ Includes subject and quoted message body.
 Only produces In\-Reply\-To, References, To, Cc, and Bcc headers.
 .RE
 .RE
+.RS
+.TP 4
+.BR \-\-reply\-to= ( all | sender )
+.RS
+.TP 4
+.BR all " (default)"
+Replies to all addresses.
+.TP 4
+.BR sender
+Replies only to the sender. If Reply-to: header (if any, otherwise
+From:) is any of the current user's configured email addresses
+(replying to user's own message), try To:, Cc:, and Bcc: headers in
+this order, and use the addresses in the first that contains something
+other than only the user's addresses for the To: address.
+.RE
+.RE

 See \fBnotmuch-search-terms\fR(7)
 for details of the supported syntax for <search-terms>.
diff --git a/notmuch-reply.c b/notmuch-reply.c
index 000f6da..71946b3 100644
--- a/notmuch-reply.c
+++ b/notmuch-reply.c
@@ -170,7 +170,7 @@ address_is_users (const char *address, notmuch_config_t 
*config)

 /* For each address in 'list' that is not configured as one of the
  * user's addresses in 'config', add that address to 'message' as an
- * address of 'type'.
+ * address of 'type', if 'add' is true.
  *
  * The first address encountered that *is* the user's address will be
  * returned, (otherwise NULL is returned).
@@ -179,7 +179,8 @@ static const char *
 add_recipients_for_address_list (GMimeMessage *message,
                                 notmuch_config_t *config,
                                 GMimeRecipientType type,
-                                InternetAddressList *list)
+                                InternetAddressList *list,
+                                notmuch_bool_t add)
 {
     InternetAddress *address;
     int i;
@@ -197,7 +198,7 @@ add_recipients_for_address_list (GMimeMessage *message,
                continue;

            add_recipients_for_address_list (message, config,
-                                            type, group_list);
+                                            type, group_list, add);
        } else {
            InternetAddressMailbox *mailbox;
            const char *name;
@@ -211,7 +212,7 @@ add_recipients_for_address_list (GMimeMessage *message,
            if (address_is_users (addr, config)) {
                if (ret == NULL)
                    ret = addr;
-           } else {
+           } else if (add) {
                g_mime_message_add_recipient (message, type, name, addr);
            }
        }
@@ -222,7 +223,7 @@ add_recipients_for_address_list (GMimeMessage *message,

 /* For each address in 'recipients' that is not configured as one of
  * the user's addresses in 'config', add that address to 'message' as
- * an address of 'type'.
+ * an address of 'type', if 'add' is true.
  *
  * The first address encountered that *is* the user's address will be
  * returned, (otherwise NULL is returned).
@@ -231,7 +232,8 @@ static const char *
 add_recipients_for_string (GMimeMessage *message,
                           notmuch_config_t *config,
                           GMimeRecipientType type,
-                          const char *recipients)
+                          const char *recipients,
+                          notmuch_bool_t add)
 {
     InternetAddressList *list;

@@ -242,7 +244,7 @@ add_recipients_for_string (GMimeMessage *message,
     if (list == NULL)
        return NULL;

-    return add_recipients_for_address_list (message, config, type, list);
+    return add_recipients_for_address_list (message, config, type, list, add);
 }

 /* Does the address in the Reply-To header of 'message' already appear
@@ -286,13 +288,19 @@ reply_to_header_is_redundant (notmuch_message_t *message)

 /* Augments the recipients of reply from the headers of message.
  *
+ * If 'reply_all' is true, use sender and all recipients, otherwise use the
+ * first header that contains something other than the user's addresses
+ * (typically this would be reply-to-sender, but also handles reply to user's
+ * own message in a sensible way).
+ *
  * If any of the user's addresses were found in these headers, the first
  * of these returned, otherwise NULL is returned.
  */
 static const char *
 add_recipients_from_message (GMimeMessage *reply,
                             notmuch_config_t *config,
-                            notmuch_message_t *message)
+                            notmuch_message_t *message,
+                            notmuch_bool_t reply_all)
 {
     struct {
        const char *header;
@@ -305,6 +313,7 @@ add_recipients_from_message (GMimeMessage *reply,
        { "bcc",        NULL, GMIME_RECIPIENT_TYPE_BCC }
     };
     const char *from_addr = NULL;
+    notmuch_bool_t add_recipients = TRUE;
     unsigned int i;

     /* Some mailing lists munge the Reply-To header despite it being A Bad
@@ -325,6 +334,7 @@ add_recipients_from_message (GMimeMessage *reply,

     for (i = 0; i < ARRAY_SIZE (reply_to_map); i++) {
        const char *addr, *recipients;
+       GMimeRecipientType recipient_type;

        recipients = notmuch_message_get_header (message,
                                                 reply_to_map[i].header);
@@ -332,11 +342,37 @@ add_recipients_from_message (GMimeMessage *reply,
            recipients = notmuch_message_get_header (message,
                                                     reply_to_map[i].fallback);

-       addr = add_recipients_for_string (reply, config,
-                                         reply_to_map[i].recipient_type,
-                                         recipients);
+       /* Force recipient type in reply-to-sender mode just in case replying to
+        * user's own message finds recipients in Cc/Bcc fields only.
+        */
+       if (reply_all)
+           recipient_type = reply_to_map[i].recipient_type;
+       else
+           recipient_type = GMIME_RECIPIENT_TYPE_TO;
+
+       addr = add_recipients_for_string (reply, config, recipient_type,
+                                         recipients, add_recipients);
+
        if (from_addr == NULL)
            from_addr = addr;
+
+       if (!reply_all) {
+           /* Stop adding new recipients in reply-to-sender mode if we have
+            * added some recipient(s) above.
+            *
+            * This also handles the case of user replying to his own message,
+            * where reply-to/from is not a recipient. In this case there may be
+            * more than one recipient even if not replying to all.
+            */
+           InternetAddressList *list;
+           list = g_mime_message_get_recipients (reply, recipient_type);
+           if (list && internet_address_list_length (list))
+               add_recipients = FALSE;
+
+           /* Check if we've got a from address and all recipients we need. */
+           if (!add_recipients && from_addr)
+               break;
+       }
     }

     return from_addr;
@@ -480,7 +516,8 @@ static int
 notmuch_reply_format_default(void *ctx,
                             notmuch_config_t *config,
                             notmuch_query_t *query,
-                            notmuch_show_params_t *params)
+                            notmuch_show_params_t *params,
+                            notmuch_bool_t reply_all)
 {
     GMimeMessage *reply;
     notmuch_messages_t *messages;
@@ -509,7 +546,8 @@ notmuch_reply_format_default(void *ctx,
            g_mime_message_set_subject (reply, subject);
        }

-       from_addr = add_recipients_from_message (reply, config, message);
+       from_addr = add_recipients_from_message (reply, config, message,
+                                                reply_all);

        if (from_addr == NULL)
            from_addr = guess_from_received_header (config, message);
@@ -558,7 +596,8 @@ static int
 notmuch_reply_format_headers_only(void *ctx,
                                  notmuch_config_t *config,
                                  notmuch_query_t *query,
-                                 unused (notmuch_show_params_t *params))
+                                 unused (notmuch_show_params_t *params),
+                                 notmuch_bool_t reply_all)
 {
     GMimeMessage *reply;
     notmuch_messages_t *messages;
@@ -598,7 +637,7 @@ notmuch_reply_format_headers_only(void *ctx,
        g_mime_object_set_header (GMIME_OBJECT (reply),
                                  "References", references);

-       (void)add_recipients_from_message (reply, config, message);
+       (void)add_recipients_from_message (reply, config, message, reply_all);

        reply_headers = g_mime_object_to_string (GMIME_OBJECT (reply));
        printf ("%s", reply_headers);
@@ -625,9 +664,10 @@ notmuch_reply_command (void *ctx, int argc, char *argv[])
     notmuch_query_t *query;
     char *query_string;
     int opt_index, ret = 0;
-    int (*reply_format_func)(void *ctx, notmuch_config_t *config, 
notmuch_query_t *query, notmuch_show_params_t *params);
+    int (*reply_format_func)(void *ctx, notmuch_config_t *config, 
notmuch_query_t *query, notmuch_show_params_t *params, notmuch_bool_t 
reply_all);
     notmuch_show_params_t params = { .part = -1 };
     int format = FORMAT_DEFAULT;
+    int reply_all = TRUE;
     notmuch_bool_t decrypt = FALSE;

     notmuch_opt_desc_t options[] = {
@@ -635,6 +675,10 @@ notmuch_reply_command (void *ctx, int argc, char *argv[])
          (notmuch_keyword_t []){ { "default", FORMAT_DEFAULT },
                                  { "headers-only", FORMAT_HEADERS_ONLY },
                                  { 0, 0 } } },
+       { NOTMUCH_OPT_KEYWORD, &reply_all, "reply-to", 'r',
+         (notmuch_keyword_t []){ { "all", TRUE },
+                                 { "sender", FALSE },
+                                 { 0, 0 } } },
        { NOTMUCH_OPT_BOOLEAN, &decrypt, "decrypt", 'd', 0 },
        { 0, 0, 0, 0, 0 }
     };
@@ -688,7 +732,7 @@ notmuch_reply_command (void *ctx, int argc, char *argv[])
        return 1;
     }

-    if (reply_format_func (ctx, config, query, &params) != 0)
+    if (reply_format_func (ctx, config, query, &params, reply_all) != 0)
        return 1;

     notmuch_query_destroy (query);
-- 
1.7.5.4

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