Some workflows prefer to track exactly which email message was used to
generate a commit.  This can be used, for example, to generate an
automated acknowledgement when a patch is committed as a response to
the patch email, or as a reference to the thread which introduced the
patch.

Support this by adding a --message-id option (abbreviated as -m) to
git-am, which will then extract the message ID and append it to the
email commit log.

Signed-off-by: Avi Kivity <a...@cloudius-systems.com>
---

v2: adjust to pass test suite (t5100)

 Documentation/git-am.txt |  6 ++++++
 builtin/mailinfo.c       |  2 +-
 git-am.sh                | 10 +++++++++-
 t/t5100/info0004         |  1 +
 t/t5100/info0005         |  1 +
 t/t5100/info0012         |  1 +
 6 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/Documentation/git-am.txt b/Documentation/git-am.txt
index 9adce37..8a251a1 100644
--- a/Documentation/git-am.txt
+++ b/Documentation/git-am.txt
@@ -15,6 +15,7 @@ SYNOPSIS
         [--whitespace=<option>] [-C<n>] [-p<n>] [--directory=<dir>]
         [--exclude=<path>] [--include=<path>] [--reject] [-q | --quiet]
         [--[no-]scissors] [-S[<keyid>]] [--patch-format=<format>]
+        [--message-id]
         [(<mbox> | <Maildir>)...]
 'git am' (--continue | --skip | --abort)
 
@@ -121,6 +122,11 @@ default.   You can use `--no-utf8` to override this.
        user to lie about the author date by using the same
        value as the committer date.
 
+-m::
+--message-id::
+       Extract the Message-Id: header from the e-mail and
+       append it to the commit message's tag stanza.
+
 --skip::
        Skip the current patch.  This is only meaningful when
        restarting an aborted patch.
diff --git a/builtin/mailinfo.c b/builtin/mailinfo.c
index cf11c8d..f1e1fed 100644
--- a/builtin/mailinfo.c
+++ b/builtin/mailinfo.c
@@ -278,7 +278,7 @@ static void cleanup_space(struct strbuf *sb)
 
 static void decode_header(struct strbuf *line);
 static const char *header[MAX_HDR_PARSED] = {
-       "From","Subject","Date",
+       "From","Subject","Date","Message-Id"
 };
 
 static inline int cmp_header(const struct strbuf *line, const char *hdr)
diff --git a/git-am.sh b/git-am.sh
index ee61a77..c0e7bdd 100755
--- a/git-am.sh
+++ b/git-am.sh
@@ -39,6 +39,7 @@ committer-date-is-author-date    lie about committer date
 ignore-date     use current timestamp for author date
 rerere-autoupdate update the index with reused conflict resolution if possible
 S,gpg-sign?     GPG-sign commits
+m,message-id    copy the Message-Id: header to the commit's tag stanza
 rebasing*       (internal use for git-rebase)"
 
 . git-sh-setup
@@ -371,7 +372,7 @@ split_patches () {
 prec=4
 dotest="$GIT_DIR/rebase-apply"
 sign= utf8=t keep= keepcr= skip= interactive= resolved= rebasing= abort=
-resolvemsg= resume= scissors= no_inbody_headers=
+resolvemsg= resume= scissors= no_inbody_headers= message_id=
 git_apply_opt=
 committer_date_is_author_date=
 ignore_date=
@@ -442,6 +443,8 @@ it will be removed. Please do not use it anymore."
                gpg_sign_opt=-S ;;
        --gpg-sign=*)
                gpg_sign_opt="-S${1#--gpg-sign=}" ;;
+       -m|--message-id)
+               message_id=t ;;
        --)
                shift; break ;;
        *)
@@ -565,6 +568,7 @@ Use \"git am --abort\" to remove it.")"
        echo " $git_apply_opt" >"$dotest/apply-opt"
        echo "$threeway" >"$dotest/threeway"
        echo "$sign" >"$dotest/sign"
+       echo "$message_id" > "$dotest/message-id"
        echo "$utf8" >"$dotest/utf8"
        echo "$keep" >"$dotest/keep"
        echo "$scissors" >"$dotest/scissors"
@@ -757,6 +761,10 @@ To restore the original branch and stop patching run 
\"\$cmdline --abort\"."
                then
                        cat "$dotest/msg-clean"
                fi
+               if test 't' == "$message_id"
+               then
+                       grep ^Message-Id: "$dotest/info" || true
+               fi
                if test '' != "$ADD_SIGNOFF"
                then
                        echo "$ADD_SIGNOFF"
diff --git a/t/t5100/info0004 b/t/t5100/info0004
index 616c309..f7e2983 100644
--- a/t/t5100/info0004
+++ b/t/t5100/info0004
@@ -2,4 +2,5 @@ Author: YOSHIFUJI Hideaki / 吉藤英明
 Email: yoshf...@linux-ipv6.org
 Subject: GIT: Try all addresses for given remote name
 Date: Thu, 21 Jul 2005 09:10:36 -0400 (EDT)
+Message-Id: <20050721.091036.01119516.yoshf...@linux-ipv6.org>
 
diff --git a/t/t5100/info0005 b/t/t5100/info0005
index 46a46fc..592388f 100644
--- a/t/t5100/info0005
+++ b/t/t5100/info0005
@@ -2,4 +2,5 @@ Author: David Kågedal
 Email: dav...@lysator.liu.se
 Subject: Fixed two bugs in git-cvsimport-script.
 Date: Mon, 15 Aug 2005 20:18:25 +0200
+Message-Id: <u5tacjjdpxq....@lysator.liu.se>
 
diff --git a/t/t5100/info0012 b/t/t5100/info0012
index ac1216f..b5d89a1 100644
--- a/t/t5100/info0012
+++ b/t/t5100/info0012
@@ -2,4 +2,5 @@ Author: Dmitriy Blinov
 Email: b...@mnsspb.ru
 Subject: Изменён список пакетов необходимых для сборки
 Date: Wed, 12 Nov 2008 17:54:41 +0300
+Message-Id: <1226501681-24923-1-git-send-email-...@mnsspb.ru>
 
-- 
1.9.3

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