Add option to enable threading headers

Add a --thread option to enable generation of In-Reply-To and References
headers, used to make the second and subsequent mails appear as replies to the
first.

Signed-off-by: Josh Triplett <josh@freedesktop.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/Documentation/git-format-patch.txt b/Documentation/git-format-patch.txt
index 4ca0014..305bd79 100644 (file)
--- a/Documentation/git-format-patch.txt
+++ b/Documentation/git-format-patch.txt
@@ -9,7 +9,7 @@ git-format-patch - Prepare patches for e-mail submission
 SYNOPSIS
 --------
 [verse]
-'git-format-patch' [-n | -k] [-o <dir> | --stdout] [--attach]
+'git-format-patch' [-n | -k] [-o <dir> | --stdout] [--attach] [--thread]
                   [-s | --signoff] [--diff-options] [--start-number <n>]
                   <since>[..<until>]
 
@@ -35,6 +35,10 @@ they are created in the current working directory.
 If -n is specified, instead of "[PATCH] Subject", the first line
 is formatted as "[PATCH n/m] Subject".
 
+If given --thread, git-format-patch will generate In-Reply-To and
+References headers to make the second and subsequent patch mails appear
+as replies to the first mail; this also generates a Message-Id header to
+reference.
 
 OPTIONS
 -------
@@ -63,6 +67,10 @@ OPTIONS
 --attach::
        Create attachments instead of inlining patches.
 
+--thread::
+       Add In-Reply-To and References headers to make the second and
+       subsequent mails appear as replies to the first.  Also generates
+       the Message-Id header to reference.
 
 CONFIGURATION
 -------------

diff --git a/builtin-log.c b/builtin-log.c
index 1f1074c..6466768 100644 (file)
--- a/builtin-log.c
+++ b/builtin-log.c
@@ -248,6 +248,7 @@ int cmd_format_patch(int argc, const char **argv, char **envp)
        int start_number = -1;
        int keep_subject = 0;
        int ignore_if_in_upstream = 0;
+       int thread = 0;
        struct diff_options patch_id_opts;
        char *add_signoff = NULL;
        char message_id[1024];
@@ -317,6 +318,8 @@ int cmd_format_patch(int argc, const char **argv, char **envp)
                        rev.mime_boundary = argv[i] + 9;
                else if (!strcmp(argv[i], "--ignore-if-in-upstream"))
                        ignore_if_in_upstream = 1;
+               else if (!strcmp(argv[i], "--thread"))
+                       thread = 1;
                else
                        argv[j++] = argv[i];
        }
@@ -379,15 +382,17 @@ int cmd_format_patch(int argc, const char **argv, char **envp)
                commit = list[nr];
                rev.nr = total - nr + (start_number - 1);
                /* Make the second and subsequent mails replies to the first */
-               if (nr == (total - 2)) {
-                       strncpy(ref_message_id, message_id,
-                               sizeof(ref_message_id));
-                       ref_message_id[sizeof(ref_message_id)-1] = '\0';
-                       rev.ref_message_id = ref_message_id;
+               if (thread) {
+                       if (nr == (total - 2)) {
+                               strncpy(ref_message_id, message_id,
+                                       sizeof(ref_message_id));
+                               ref_message_id[sizeof(ref_message_id)-1]='\0';
+                               rev.ref_message_id = ref_message_id;
+                       }
+                       gen_message_id(message_id, sizeof(message_id),
+                                      sha1_to_hex(commit->object.sha1));
+                       rev.message_id = message_id;
                }
-               gen_message_id(message_id, sizeof(message_id),
-                              sha1_to_hex(commit->object.sha1));
-               rev.message_id = message_id;
                if (!use_stdout)
                        reopen_stdout(commit, rev.nr, keep_subject);
                shown = log_tree_commit(&rev, commit);