Move the relevant code from sequencer to log-tree. This code is not
specific to sequencer, and this allows the sequencer to move out of
libgit.

Signed-off-by: Felipe Contreras <felipe.contre...@gmail.com>
---
 log-tree.c  | 161 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 log-tree.h  |   3 ++
 sequencer.c | 160 ++---------------------------------------------------------
 sequencer.h |   4 --
 4 files changed, 166 insertions(+), 162 deletions(-)

diff --git a/log-tree.c b/log-tree.c
index 2eb69bc..654f5db 100644
--- a/log-tree.c
+++ b/log-tree.c
@@ -9,10 +9,13 @@
 #include "string-list.h"
 #include "color.h"
 #include "gpg-interface.h"
-#include "sequencer.h"
 #include "line-log.h"
 
+#define APPEND_SIGNOFF_DEDUP (1u << 0)
+
 struct decoration name_decoration = { "object names" };
+const char sign_off_header[] = "Signed-off-by: ";
+static const char cherry_picked_prefix[] = "(cherry picked from commit ";
 
 enum decoration_type {
        DECORATION_NONE = 0,
@@ -472,6 +475,162 @@ static void show_mergetag(struct rev_info *opt, struct 
commit *commit)
        free_commit_extra_headers(to_free);
 }
 
+static int is_rfc2822_line(const char *buf, int len)
+{
+       int i;
+
+       for (i = 0; i < len; i++) {
+               int ch = buf[i];
+               if (ch == ':')
+                       return 1;
+               if (!isalnum(ch) && ch != '-')
+                       break;
+       }
+
+       return 0;
+}
+
+static int is_cherry_picked_from_line(const char *buf, int len)
+{
+       /*
+        * We only care that it looks roughly like (cherry picked from ...)
+        */
+       return len > strlen(cherry_picked_prefix) + 1 &&
+               !prefixcmp(buf, cherry_picked_prefix) && buf[len - 1] == ')';
+}
+
+/*
+ * Returns 0 for non-conforming footer
+ * Returns 1 for conforming footer
+ * Returns 2 when sob exists within conforming footer
+ * Returns 3 when sob exists within conforming footer as last entry
+ */
+int has_conforming_footer(struct strbuf *sb, struct strbuf *sob,
+       int ignore_footer)
+{
+       char prev;
+       int i, k;
+       int len = sb->len - ignore_footer;
+       const char *buf = sb->buf;
+       int found_sob = 0;
+
+       /* footer must end with newline */
+       if (!len || buf[len - 1] != '\n')
+               return 0;
+
+       prev = '\0';
+       for (i = len - 1; i > 0; i--) {
+               char ch = buf[i];
+               if (prev == '\n' && ch == '\n') /* paragraph break */
+                       break;
+               prev = ch;
+       }
+
+       /* require at least one blank line */
+       if (prev != '\n' || buf[i] != '\n')
+               return 0;
+
+       /* advance to start of last paragraph */
+       while (i < len - 1 && buf[i] == '\n')
+               i++;
+
+       for (; i < len; i = k) {
+               int found_rfc2822;
+
+               for (k = i; k < len && buf[k] != '\n'; k++)
+                       ; /* do nothing */
+               k++;
+
+               found_rfc2822 = is_rfc2822_line(buf + i, k - i - 1);
+               if (found_rfc2822 && sob &&
+                   !strncmp(buf + i, sob->buf, sob->len))
+                       found_sob = k;
+
+               if (!(found_rfc2822 ||
+                     is_cherry_picked_from_line(buf + i, k - i - 1)))
+                       return 0;
+       }
+       if (found_sob == i)
+               return 3;
+       if (found_sob)
+               return 2;
+       return 1;
+}
+
+void append_cherrypick(struct strbuf *msgbuf, struct object *obj)
+{
+       if (!has_conforming_footer(msgbuf, NULL, 0))
+               strbuf_addch(msgbuf, '\n');
+       strbuf_addstr(msgbuf, cherry_picked_prefix);
+       strbuf_addstr(msgbuf, sha1_to_hex(obj->sha1));
+       strbuf_addstr(msgbuf, ")\n");
+}
+
+void append_signoff(struct strbuf *msgbuf, int ignore_footer, unsigned flag)
+{
+       unsigned no_dup_sob = flag & APPEND_SIGNOFF_DEDUP;
+       struct strbuf sob = STRBUF_INIT;
+       int has_footer;
+
+       strbuf_addstr(&sob, sign_off_header);
+       strbuf_addstr(&sob, fmt_name(getenv("GIT_COMMITTER_NAME"),
+                               getenv("GIT_COMMITTER_EMAIL")));
+       strbuf_addch(&sob, '\n');
+
+       /*
+        * If the whole message buffer is equal to the sob, pretend that we
+        * found a conforming footer with a matching sob
+        */
+       if (msgbuf->len - ignore_footer == sob.len &&
+           !strncmp(msgbuf->buf, sob.buf, sob.len))
+               has_footer = 3;
+       else
+               has_footer = has_conforming_footer(msgbuf, &sob, ignore_footer);
+
+       if (!has_footer) {
+               const char *append_newlines = NULL;
+               size_t len = msgbuf->len - ignore_footer;
+
+               if (!len) {
+                       /*
+                        * The buffer is completely empty.  Leave foom for
+                        * the title and body to be filled in by the user.
+                        */
+                       append_newlines = "\n\n";
+               } else if (msgbuf->buf[len - 1] != '\n') {
+                       /*
+                        * Incomplete line.  Complete the line and add a
+                        * blank one so that there is an empty line between
+                        * the message body and the sob.
+                        */
+                       append_newlines = "\n\n";
+               } else if (len == 1) {
+                       /*
+                        * Buffer contains a single newline.  Add another
+                        * so that we leave room for the title and body.
+                        */
+                       append_newlines = "\n";
+               } else if (msgbuf->buf[len - 2] != '\n') {
+                       /*
+                        * Buffer ends with a single newline.  Add another
+                        * so that there is an empty line between the message
+                        * body and the sob.
+                        */
+                       append_newlines = "\n";
+               } /* else, the buffer already ends with two newlines. */
+
+               if (append_newlines)
+                       strbuf_splice(msgbuf, msgbuf->len - ignore_footer, 0,
+                               append_newlines, strlen(append_newlines));
+       }
+
+       if (has_footer != 3 && (!no_dup_sob || has_footer != 2))
+               strbuf_splice(msgbuf, msgbuf->len - ignore_footer, 0,
+                               sob.buf, sob.len);
+
+       strbuf_release(&sob);
+}
+
 void show_log(struct rev_info *opt)
 {
        struct strbuf msgbuf = STRBUF_INIT;
diff --git a/log-tree.h b/log-tree.h
index d6ecd4d..1039e49 100644
--- a/log-tree.h
+++ b/log-tree.h
@@ -25,4 +25,7 @@ void load_ref_decorations(int flags);
 void fmt_output_commit(struct strbuf *, struct commit *, struct rev_info *);
 void fmt_output_subject(struct strbuf *, const char *subject, struct rev_info 
*);
 
+void append_cherrypick(struct strbuf *msgbuf, struct object *obj);
+void append_signoff(struct strbuf *msgbuf, int ignore_footer, unsigned flag);
+
 #endif
diff --git a/sequencer.c b/sequencer.c
index ab6f8a7..e92e039 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -14,94 +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 const char cherry_picked_prefix[] = "(cherry picked from commit ";
-
-static int is_rfc2822_line(const char *buf, int len)
-{
-       int i;
-
-       for (i = 0; i < len; i++) {
-               int ch = buf[i];
-               if (ch == ':')
-                       return 1;
-               if (!isalnum(ch) && ch != '-')
-                       break;
-       }
-
-       return 0;
-}
-
-static int is_cherry_picked_from_line(const char *buf, int len)
-{
-       /*
-        * We only care that it looks roughly like (cherry picked from ...)
-        */
-       return len > strlen(cherry_picked_prefix) + 1 &&
-               !prefixcmp(buf, cherry_picked_prefix) && buf[len - 1] == ')';
-}
-
-/*
- * Returns 0 for non-conforming footer
- * Returns 1 for conforming footer
- * Returns 2 when sob exists within conforming footer
- * Returns 3 when sob exists within conforming footer as last entry
- */
-static int has_conforming_footer(struct strbuf *sb, struct strbuf *sob,
-       int ignore_footer)
-{
-       char prev;
-       int i, k;
-       int len = sb->len - ignore_footer;
-       const char *buf = sb->buf;
-       int found_sob = 0;
-
-       /* footer must end with newline */
-       if (!len || buf[len - 1] != '\n')
-               return 0;
-
-       prev = '\0';
-       for (i = len - 1; i > 0; i--) {
-               char ch = buf[i];
-               if (prev == '\n' && ch == '\n') /* paragraph break */
-                       break;
-               prev = ch;
-       }
-
-       /* require at least one blank line */
-       if (prev != '\n' || buf[i] != '\n')
-               return 0;
-
-       /* advance to start of last paragraph */
-       while (i < len - 1 && buf[i] == '\n')
-               i++;
-
-       for (; i < len; i = k) {
-               int found_rfc2822;
-
-               for (k = i; k < len && buf[k] != '\n'; k++)
-                       ; /* do nothing */
-               k++;
-
-               found_rfc2822 = is_rfc2822_line(buf + i, k - i - 1);
-               if (found_rfc2822 && sob &&
-                   !strncmp(buf + i, sob->buf, sob->len))
-                       found_sob = k;
-
-               if (!(found_rfc2822 ||
-                     is_cherry_picked_from_line(buf + i, k - i - 1)))
-                       return 0;
-       }
-       if (found_sob == i)
-               return 3;
-       if (found_sob)
-               return 2;
-       return 1;
-}
-
 static void remove_sequencer_state(void)
 {
        struct strbuf seq_dir = STRBUF_INIT;
@@ -578,13 +494,8 @@ static int do_pick_commit(struct commit *commit, struct 
replay_opts *opts)
                        strbuf_addstr(&msgbuf, p);
                }
 
-               if (opts->record_origin) {
-                       if (!has_conforming_footer(&msgbuf, NULL, 0))
-                               strbuf_addch(&msgbuf, '\n');
-                       strbuf_addstr(&msgbuf, cherry_picked_prefix);
-                       strbuf_addstr(&msgbuf, 
sha1_to_hex(commit->object.sha1));
-                       strbuf_addstr(&msgbuf, ")\n");
-               }
+               if (opts->record_origin)
+                       append_cherrypick(&msgbuf, &commit->object);
        }
 
        if (!opts->strategy || !strcmp(opts->strategy, "recursive") || 
opts->action == REPLAY_REVERT) {
@@ -1123,68 +1034,3 @@ int sequencer_pick_revisions(struct replay_opts *opts)
        save_opts(opts);
        return pick_commits(todo_list, opts);
 }
-
-void append_signoff(struct strbuf *msgbuf, int ignore_footer, unsigned flag)
-{
-       unsigned no_dup_sob = flag & APPEND_SIGNOFF_DEDUP;
-       struct strbuf sob = STRBUF_INIT;
-       int has_footer;
-
-       strbuf_addstr(&sob, sign_off_header);
-       strbuf_addstr(&sob, fmt_name(getenv("GIT_COMMITTER_NAME"),
-                               getenv("GIT_COMMITTER_EMAIL")));
-       strbuf_addch(&sob, '\n');
-
-       /*
-        * If the whole message buffer is equal to the sob, pretend that we
-        * found a conforming footer with a matching sob
-        */
-       if (msgbuf->len - ignore_footer == sob.len &&
-           !strncmp(msgbuf->buf, sob.buf, sob.len))
-               has_footer = 3;
-       else
-               has_footer = has_conforming_footer(msgbuf, &sob, ignore_footer);
-
-       if (!has_footer) {
-               const char *append_newlines = NULL;
-               size_t len = msgbuf->len - ignore_footer;
-
-               if (!len) {
-                       /*
-                        * The buffer is completely empty.  Leave foom for
-                        * the title and body to be filled in by the user.
-                        */
-                       append_newlines = "\n\n";
-               } else if (msgbuf->buf[len - 1] != '\n') {
-                       /*
-                        * Incomplete line.  Complete the line and add a
-                        * blank one so that there is an empty line between
-                        * the message body and the sob.
-                        */
-                       append_newlines = "\n\n";
-               } else if (len == 1) {
-                       /*
-                        * Buffer contains a single newline.  Add another
-                        * so that we leave room for the title and body.
-                        */
-                       append_newlines = "\n";
-               } else if (msgbuf->buf[len - 2] != '\n') {
-                       /*
-                        * Buffer ends with a single newline.  Add another
-                        * so that there is an empty line between the message
-                        * body and the sob.
-                        */
-                       append_newlines = "\n";
-               } /* else, the buffer already ends with two newlines. */
-
-               if (append_newlines)
-                       strbuf_splice(msgbuf, msgbuf->len - ignore_footer, 0,
-                               append_newlines, strlen(append_newlines));
-       }
-
-       if (has_footer != 3 && (!no_dup_sob || has_footer != 2))
-               strbuf_splice(msgbuf, msgbuf->len - ignore_footer, 0,
-                               sob.buf, sob.len);
-
-       strbuf_release(&sob);
-}
diff --git a/sequencer.h b/sequencer.h
index 1fc22dc..c341918 100644
--- a/sequencer.h
+++ b/sequencer.h
@@ -6,8 +6,6 @@
 #define SEQ_TODO_FILE  "sequencer/todo"
 #define SEQ_OPTS_FILE  "sequencer/opts"
 
-#define APPEND_SIGNOFF_DEDUP (1u << 0)
-
 enum replay_action {
        REPLAY_REVERT,
        REPLAY_PICK
@@ -50,6 +48,4 @@ int sequencer_pick_revisions(struct replay_opts *opts);
 
 extern const char sign_off_header[];
 
-void append_signoff(struct strbuf *msgbuf, int ignore_footer, unsigned flag);
-
 #endif
-- 
1.8.3.698.g079b096

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