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format-patch: refactor get_patch_filename

The get_patch_filename function expects a commit argument
and uses it to get the sanitized subject line when making a
patch filename. However, we also want to use this same
function for the cover letter, which does not have a commit
object. The current solution is to create a fake commit with
the subject "cover letter". Instead, let's make the
get_patch_filename interface more flexibile, and allow
passing a direct subject.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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commit a21c2f94fb6e74ebddb5c78cf6b5f68983646530 1 parent be641ab
Jeff King peff authored gitster committed
Showing with 20 additions and 38 deletions.
  1. +7 −28 builtin/log.c
  2. +11 −8 log-tree.c
  3. +2 −2 log-tree.h
35 builtin/log.c
View
@@ -663,7 +663,8 @@ static FILE *realstdout = NULL;
static const char *output_directory = NULL;
static int outdir_offset;
-static int reopen_stdout(struct commit *commit, struct rev_info *rev, int quiet)
+static int reopen_stdout(struct commit *commit, const char *subject,
+ struct rev_info *rev, int quiet)
{
struct strbuf filename = STRBUF_INIT;
int suffix_len = strlen(fmt_patch_suffix) + 1;
@@ -677,7 +678,7 @@ static int reopen_stdout(struct commit *commit, struct rev_info *rev, int quiet)
strbuf_addch(&filename, '/');
}
- get_patch_filename(commit, rev->nr, fmt_patch_suffix, &filename);
+ get_patch_filename(commit, subject, rev->nr, fmt_patch_suffix, &filename);
if (!quiet)
fprintf(realstdout, "%s\n", filename.buf + outdir_offset);
@@ -778,7 +779,6 @@ static void make_cover_letter(struct rev_info *rev, int use_stdout,
const char *encoding = "UTF-8";
struct diff_options opts;
int need_8bit_cte = 0;
- struct commit *commit = NULL;
struct pretty_print_context pp = {0};
if (rev->commit_format != CMIT_FMT_EMAIL)
@@ -786,31 +786,10 @@ static void make_cover_letter(struct rev_info *rev, int use_stdout,
committer = git_committer_info(0);
- if (!numbered_files) {
- /*
- * We fake a commit for the cover letter so we get the filename
- * desired.
- */
- commit = xcalloc(1, sizeof(*commit));
- commit->buffer = xmalloc(400);
- snprintf(commit->buffer, 400,
- "tree 0000000000000000000000000000000000000000\n"
- "parent %s\n"
- "author %s\n"
- "committer %s\n\n"
- "cover letter\n",
- sha1_to_hex(head->object.sha1), committer, committer);
- }
-
- if (!use_stdout && reopen_stdout(commit, rev, quiet))
+ if (!use_stdout &&
+ reopen_stdout(NULL, numbered_files ? NULL : "cover-letter", rev, quiet))
return;
- if (commit) {
-
- free(commit->buffer);
- free(commit);
- }
-
log_write_email_headers(rev, head, &pp.subject, &pp.after_subject,
&need_8bit_cte);
@@ -1405,8 +1384,8 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
gen_message_id(&rev, sha1_to_hex(commit->object.sha1));
}
- if (!use_stdout && reopen_stdout(numbered_files ? NULL : commit,
- &rev, quiet))
+ if (!use_stdout &&
+ reopen_stdout(numbered_files ? NULL : commit, NULL, &rev, quiet))
die(_("Failed to create output files"));
shown = log_tree_commit(&rev, commit);
free(commit->buffer);
19 log-tree.c
View
@@ -299,19 +299,22 @@ static unsigned int digits_in_number(unsigned int number)
return result;
}
-void get_patch_filename(struct commit *commit, int nr, const char *suffix,
- struct strbuf *buf)
+void get_patch_filename(struct commit *commit, const char *subject, int nr,
+ const char *suffix, struct strbuf *buf)
{
int suffix_len = strlen(suffix) + 1;
int start_len = buf->len;
- strbuf_addf(buf, commit ? "%04d-" : "%d", nr);
- if (commit) {
+ strbuf_addf(buf, commit || subject ? "%04d-" : "%d", nr);
+ if (commit || subject) {
int max_len = start_len + FORMAT_PATCH_NAME_MAX - suffix_len;
struct pretty_print_context ctx = {0};
- ctx.date_mode = DATE_NORMAL;
- format_commit_message(commit, "%f", buf, &ctx);
+ 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);
@@ -384,8 +387,8 @@ 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(opt->numbered_files ? NULL : commit, opt->nr,
- opt->patch_suffix, &filename);
+ get_patch_filename(opt->numbered_files ? NULL : commit, NULL,
+ opt->nr, opt->patch_suffix, &filename);
snprintf(buffer, sizeof(buffer) - 1,
"\n--%s%s\n"
"Content-Type: text/x-patch;"
4 log-tree.h
View
@@ -21,7 +21,7 @@ void log_write_email_headers(struct rev_info *opt, struct commit *commit,
void load_ref_decorations(int flags);
#define FORMAT_PATCH_NAME_MAX 64
-void get_patch_filename(struct commit *commit, int nr, const char *suffix,
- struct strbuf *buf);
+void get_patch_filename(struct commit *commit, const char *subject, int nr,
+ const char *suffix, struct strbuf *buf);
#endif
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