The function chooses from three operating modes (format using the
subject, the commit, or just number) based on NULL-ness of two of
its parameters, which is an ugly hack for sharing only a bit of
code.

Separate out the "just numbers" part out to the callers.

Signed-off-by: Junio C Hamano <gits...@pobox.com>
---
 builtin/log.c |  5 ++++-
 log-tree.c    | 29 ++++++++++++++---------------
 2 files changed, 18 insertions(+), 16 deletions(-)

diff --git a/builtin/log.c b/builtin/log.c
index d9946ec..3c6f20a 100644
--- a/builtin/log.c
+++ b/builtin/log.c
@@ -684,7 +684,10 @@ static int reopen_stdout(struct commit *commit, const char 
*subject,
                        strbuf_addch(&filename, '/');
        }
 
-       get_patch_filename(&filename, commit, subject, rev);
+       if (rev->numbered_files)
+               strbuf_addf(&filename, "%d", rev->nr);
+       else
+               get_patch_filename(&filename, commit, subject, rev);
 
        if (!quiet)
                fprintf(realstdout, "%s\n", filename.buf + outdir_offset);
diff --git a/log-tree.c b/log-tree.c
index ceed6b6..d9f86ce 100644
--- a/log-tree.c
+++ b/log-tree.c
@@ -307,21 +307,18 @@ void get_patch_filename(struct strbuf *buf,
        int nr = info->nr;
        int suffix_len = strlen(suffix) + 1;
        int start_len = buf->len;
+       int max_len = start_len + FORMAT_PATCH_NAME_MAX - suffix_len;
 
-       strbuf_addf(buf, commit || subject ? "%04d-" : "%d", nr);
-       if (commit || subject) {
-               int max_len = start_len + FORMAT_PATCH_NAME_MAX - suffix_len;
+       strbuf_addf(buf, "%04d-", nr);
+       if (subject)
+               strbuf_addstr(buf, subject);
+       else if (commit) {
                struct pretty_print_context ctx = {0};
-
-               if (subject)
-                       strbuf_addstr(buf, subject);
-               else if (commit)
-                       format_commit_message(commit, "%f", buf, &ctx);
-
-               if (max_len < buf->len)
-                       strbuf_setlen(buf, max_len);
-               strbuf_addstr(buf, suffix);
+               format_commit_message(commit, "%f", buf, &ctx);
        }
+       if (max_len < buf->len)
+               strbuf_setlen(buf, max_len);
+       strbuf_addstr(buf, suffix);
 }
 
 void log_write_email_headers(struct rev_info *opt, struct commit *commit,
@@ -390,9 +387,11 @@ void log_write_email_headers(struct rev_info *opt, struct 
commit *commit,
                         mime_boundary_leader, opt->mime_boundary);
                extra_headers = subject_buffer;
 
-               get_patch_filename(&filename,
-                                  opt->numbered_files ? NULL : commit, NULL,
-                                  opt);
+               if (opt->numbered_files)
+                       strbuf_addf(&filename, "%d", opt->nr);
+               else
+                       get_patch_filename(&filename, commit, NULL,
+                                          opt);
                snprintf(buffer, sizeof(buffer) - 1,
                         "\n--%s%s\n"
                         "Content-Type: text/x-patch;"
-- 
1.8.0.6.gd28b5d4.dirty

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