There are two implementations of append_signoff in log-tree.c and
sequencer.c, which do more or less the same thing. This patch removes
the sequencer.c's in favor of the format-patch's.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclo...@gmail.com>
---
 builtin/commit.c  | 10 ++++++++-
 log-tree.c        | 14 ++++++++----
 log-tree.h        |  4 ++++
 sequencer.c       | 65 ++-----------------------------------------------------
 sequencer.h       |  4 ----
 t/t7501-commit.sh |  2 +-
 6 files changed, 26 insertions(+), 73 deletions(-)

diff --git a/builtin/commit.c b/builtin/commit.c
index a17a5df..6d323d9 100644
--- a/builtin/commit.c
+++ b/builtin/commit.c
@@ -698,7 +698,15 @@ static int prepare_to_commit(const char *index_file, const 
char *prefix,
                        previous = eol;
                }
 
-               append_signoff(&sb, ignore_footer);
+               if (ignore_footer) {
+                       struct strbuf footer = STRBUF_INIT;
+                       strbuf_addstr(&footer, sb.buf + sb.len - ignore_footer);
+                       strbuf_setlen(&sb, sb.len - ignore_footer);
+                       append_signoff(&sb, SOB_IGNORE_SAME);
+                       strbuf_addstr(&sb, footer.buf);
+                       strbuf_release(&footer);
+               } else
+                       append_signoff(&sb, SOB_IGNORE_SAME);
        }
 
        if (fwrite(sb.buf, 1, sb.len, s->fp) < sb.len)
diff --git a/log-tree.c b/log-tree.c
index 7e50545..e8d31d9 100644
--- a/log-tree.c
+++ b/log-tree.c
@@ -12,6 +12,8 @@
 
 struct decoration name_decoration = { "object names" };
 
+const char sign_off_header[] = "Signed-off-by: ";
+
 enum decoration_type {
        DECORATION_NONE = 0,
        DECORATION_REF_LOCAL,
@@ -207,7 +209,7 @@ void show_decorations(struct rev_info *opt, struct commit 
*commit)
 }
 
 /*
- * Search for "^[-A-Za-z]+: [^@]+@" pattern. It usually matches
+ * Search for "^[-A-Za-z0-9]+: [^@]+@" pattern. It usually matches
  * Signed-off-by: and Acked-by: lines.
  */
 static int detect_any_signoff(char *letter, int size)
@@ -243,6 +245,7 @@ static int detect_any_signoff(char *letter, int size)
                }
                if (('A' <= ch && ch <= 'Z') ||
                    ('a' <= ch && ch <= 'z') ||
+                   ('0' <= ch && ch <= '9') ||
                    ch == '-') {
                        seen_head = 1;
                        continue;
@@ -253,11 +256,10 @@ static int detect_any_signoff(char *letter, int size)
        return seen_head && seen_name;
 }
 
-static void append_signoff(struct strbuf *sb, int flags)
+void append_signoff(struct strbuf *sb, int flags)
 {
        char* signoff = xstrdup(fmt_name(getenv("GIT_COMMITTER_NAME"),
                                         getenv("GIT_COMMITTER_EMAIL")));
-       static const char sign_off_header[] = "Signed-off-by: ";
        size_t signoff_len = strlen(signoff);
        int has_signoff = 0;
        char *cp;
@@ -310,7 +312,11 @@ static void append_signoff(struct strbuf *sb, int flags)
                if (!isspace(cp[signoff_len]))
                        continue;
                /* we already have him */
-               return;
+               if (flags & SOB_IGNORE_SAME) {
+                       if (cp[signoff_len + 1] == '\0')
+                               return;
+               } else
+                       return;
        }
 
        if (!has_signoff)
diff --git a/log-tree.h b/log-tree.h
index f5ac238..739f729 100644
--- a/log-tree.h
+++ b/log-tree.h
@@ -24,4 +24,8 @@ void load_ref_decorations(int flags);
 void get_patch_filename(struct commit *commit, const char *subject, int nr,
                        const char *suffix, struct strbuf *buf);
 
+#define SOB_IGNORE_SAME   1
+extern const char sign_off_header[];
+void append_signoff(struct strbuf *msgbuf, int flags);
+
 #endif
diff --git a/sequencer.c b/sequencer.c
index e3723d2..bc02a66 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -14,11 +14,10 @@
 #include "merge-recursive.h"
 #include "refs.h"
 #include "argv-array.h"
+#include "log-tree.h"
 
 #define GIT_REFLOG_ACTION "GIT_REFLOG_ACTION"
 
-const char sign_off_header[] = "Signed-off-by: ";
-
 static void remove_sequencer_state(void)
 {
        struct strbuf seq_dir = STRBUF_INIT;
@@ -236,7 +235,7 @@ static int do_recursive_merge(struct commit *base, struct 
commit *next,
        rollback_lock_file(&index_lock);
 
        if (opts->signoff)
-               append_signoff(msgbuf, 0);
+               append_signoff(msgbuf, SOB_IGNORE_SAME);
 
        if (!clean) {
                int i;
@@ -1016,63 +1015,3 @@ int sequencer_pick_revisions(struct replay_opts *opts)
        save_opts(opts);
        return pick_commits(todo_list, opts);
 }
-
-static int ends_rfc2822_footer(struct strbuf *sb, int ignore_footer)
-{
-       int ch;
-       int hit = 0;
-       int i, j, k;
-       int len = sb->len - ignore_footer;
-       int first = 1;
-       const char *buf = sb->buf;
-
-       for (i = len - 1; i > 0; i--) {
-               if (hit && buf[i] == '\n')
-                       break;
-               hit = (buf[i] == '\n');
-       }
-
-       while (i < len - 1 && buf[i] == '\n')
-               i++;
-
-       for (; i < len; i = k) {
-               for (k = i; k < len && buf[k] != '\n'; k++)
-                       ; /* do nothing */
-               k++;
-
-               if ((buf[k] == ' ' || buf[k] == '\t') && !first)
-                       continue;
-
-               first = 0;
-
-               for (j = 0; i + j < len; j++) {
-                       ch = buf[i + j];
-                       if (ch == ':')
-                               break;
-                       if (isalnum(ch) ||
-                           (ch == '-'))
-                               continue;
-                       return 0;
-               }
-       }
-       return 1;
-}
-
-void append_signoff(struct strbuf *msgbuf, int ignore_footer)
-{
-       struct strbuf sob = STRBUF_INIT;
-       int i;
-
-       strbuf_addstr(&sob, sign_off_header);
-       strbuf_addstr(&sob, fmt_name(getenv("GIT_COMMITTER_NAME"),
-                               getenv("GIT_COMMITTER_EMAIL")));
-       strbuf_addch(&sob, '\n');
-       for (i = msgbuf->len - 1 - ignore_footer; i > 0 && msgbuf->buf[i - 1] 
!= '\n'; i--)
-               ; /* do nothing */
-       if (prefixcmp(msgbuf->buf + i, sob.buf)) {
-               if (!i || !ends_rfc2822_footer(msgbuf, ignore_footer))
-                       strbuf_splice(msgbuf, msgbuf->len - ignore_footer, 0, 
"\n", 1);
-               strbuf_splice(msgbuf, msgbuf->len - ignore_footer, 0, sob.buf, 
sob.len);
-       }
-       strbuf_release(&sob);
-}
diff --git a/sequencer.h b/sequencer.h
index 9d57d57..99eb7fa 100644
--- a/sequencer.h
+++ b/sequencer.h
@@ -46,8 +46,4 @@ struct replay_opts {
 
 int sequencer_pick_revisions(struct replay_opts *opts);
 
-extern const char sign_off_header[];
-
-void append_signoff(struct strbuf *msgbuf, int ignore_footer);
-
 #endif
diff --git a/t/t7501-commit.sh b/t/t7501-commit.sh
index 195e747..6dd4580 100755
--- a/t/t7501-commit.sh
+++ b/t/t7501-commit.sh
@@ -353,7 +353,7 @@ test_expect_success 'signoff gap' '
 
        echo 3 >positive &&
        git add positive &&
-       alt="Alt-RFC-822-Header: Value" &&
+       alt="Alt-RFC-822-Header: Va@lue" &&
        git commit -s -m "welcome
 
 $alt" &&
-- 
1.8.0.4.g5d0415a

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