format-patch: track several references

Currently, format-patch can only track a single reference (the
In-Reply-To:) for each mail.  To ensure proper threading, we should
list all known references for every mail.

Change the rev_info.ref_message_id field to a string_list, so that we
can append references at will, and change the output formatting
routines to print all of them in the References: header.  The last
entry in the list is implicitly assumed to be the In-Reply-To:, which
gives output consistent with RFC 2822:

   The "References:" field will contain the contents of the parent's
   "References:" field (if any) followed by the contents of the
   parent's "Message-ID:" field (if any).

Note that this is just preparatory work; nothing uses it yet, so all
"References:" fields in the output are still only one deep.

Signed-off-by: Thomas Rast <trast@student.ethz.ch>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin-log.c b/builtin-log.c
index 2ae39afccdc1978141fe4cc4453befa632ecaadf..59671139b8d3d5f528aa31d71735fa58f9e02360 100644 (file)
--- a/builtin-log.c
+++ b/builtin-log.c
@@ -17,6 +17,7 @@
 #include "run-command.h"
 #include "shortlog.h"
 #include "remote.h"
+#include "string-list.h"
 
 /* Set a default date-time format for git log ("log.date" config variable) */
 static const char *default_date_mode = NULL;
@@ -1011,8 +1012,12 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
                numbered = 1;
        if (numbered)
                rev.total = total + start_number - 1;
-       if (in_reply_to)
-               rev.ref_message_id = clean_message_id(in_reply_to);
+       if (in_reply_to || thread || cover_letter)
+               rev.ref_message_ids = xcalloc(1, sizeof(struct string_list));
+       if (in_reply_to) {
+               const char *msgid = clean_message_id(in_reply_to);
+               string_list_append(msgid, rev.ref_message_ids);
+       }
        if (cover_letter) {
                if (thread)
                        gen_message_id(&rev, "cover");
@@ -1036,10 +1041,11 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
                                 * otherwise, make everything a reply
                                 * to that.
                                 */
-                               if (rev.ref_message_id)
+                               if (rev.ref_message_ids->nr > 0)
                                        free(rev.message_id);
                                else
-                                       rev.ref_message_id = rev.message_id;
+                                       string_list_append(rev.message_id,
+                                                          rev.ref_message_ids);
                        }
                        gen_message_id(&rev, sha1_to_hex(commit->object.sha1));
                }

diff --git a/log-tree.c b/log-tree.c
index 84a74e544b7bcc20c887f321e389ecf3cfb560d6..a315ebb78fcf6fccca444f678cbd6977e5e7fcbc 100644 (file)
--- a/log-tree.c
+++ b/log-tree.c
@@ -6,6 +6,7 @@
 #include "log-tree.h"
 #include "reflog-walk.h"
 #include "refs.h"
+#include "string-list.h"
 
 struct decoration name_decoration = { "object names" };
 
@@ -211,9 +212,13 @@ void log_write_email_headers(struct rev_info *opt, const char *name,
                printf("Message-Id: <%s>\n", opt->message_id);
                graph_show_oneline(opt->graph);
        }
-       if (opt->ref_message_id) {
-               printf("In-Reply-To: <%s>\nReferences: <%s>\n",
-                      opt->ref_message_id, opt->ref_message_id);
+       if (opt->ref_message_ids && opt->ref_message_ids->nr > 0) {
+               int i, n;
+               n = opt->ref_message_ids->nr;
+               printf("In-Reply-To: <%s>\n", opt->ref_message_ids->items[n-1].string);
+               for (i = 0; i < n; i++)
+                       printf("%s<%s>\n", (i > 0 ? "\t" : "References: "),
+                              opt->ref_message_ids->items[i].string);
                graph_show_oneline(opt->graph);
        }
        if (opt->mime_boundary) {

diff --git a/revision.h b/revision.h
index 7cf848771b5be811f7741ce988b860760202f6f3..8c0a41713cb51760e7bdb1d9ddff2139841ca56f 100644 (file)
--- a/revision.h
+++ b/revision.h
@@ -89,7 +89,7 @@ struct rev_info {
        int             nr, total;
        const char      *mime_boundary;
        char            *message_id;
-       const char      *ref_message_id;
+       struct string_list *ref_message_ids;
        const char      *add_signoff;
        const char      *extra_headers;
        const char      *log_reencode;