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pretty: drop print_email_subject flag

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With one exception, the print_email_subject flag is set if and only if
the commit format is email based:

  - in make_cover_letter() we set it along with CMIT_FMT_EMAIL
    explicitly

  - in show_log(), we set it if cmit_fmt_is_mail() is true. That covers
    format-patch as well as "git log --format=email" (or mboxrd).

The one exception is "rev-list --format=email", which somewhat
nonsensically prints the author and date as email headers, but no
subject, like:

  $ git rev-list --format=email HEAD
  commit 64fc4c2cdd4db2645eaabb47aa4bac820b03cdba
  From: Jeff King <peff@peff.net>
  Date: Tue, 19 Mar 2024 19:39:26 -0400

  this is the subject

  this is the body

It's doubtful that this is a useful format at all (the "commit" lines
replace the "From" lines that would make it work as an actual mbox).
But I think that printing the subject as a header (like this patch does)
is the least surprising thing to do.

So let's drop this field, making the code a little simpler and easier to
reason about. Note that we do need to set the "rev" field of the
pretty_print_context in rev-list, since that is used to check for
subject_prefix, etc. It's not possible to set those fields via rev-list,
so we'll always just print "Subject: ". But unless we pass in our
rev_info, fmt_output_email_subject() would segfault trying to figure it
out.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff King
2024-03-19 20:30:44 -04:00
committed by Junio C Hamano
parent 69aff6200c
commit d5a90d6319
5 changed files with 9 additions and 16 deletions
Download Patch File Download Diff File Expand all files Collapse all files

21
pretty.c
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@@ -2091,19 +2091,14 @@ void pp_email_subject(struct pretty_print_context *pp,
pp->preserve_subject ? "\n" : " ");
strbuf_grow(sb, title.len + 1024);
if (pp->print_email_subject) {
if (pp->rev)
fmt_output_email_subject(sb, pp->rev);
if (pp->encode_email_headers &&
needs_rfc2047_encoding(title.buf, title.len))
add_rfc2047(sb, title.buf, title.len,
encoding, RFC2047_SUBJECT);
else
strbuf_add_wrapped_bytes(sb, title.buf, title.len,
fmt_output_email_subject(sb, pp->rev);
if (pp->encode_email_headers &&
needs_rfc2047_encoding(title.buf, title.len))
add_rfc2047(sb, title.buf, title.len,
encoding, RFC2047_SUBJECT);
else
strbuf_add_wrapped_bytes(sb, title.buf, title.len,
-last_line_length(sb), 1, max_length);
} else {
strbuf_addbuf(sb, &title);
}
strbuf_addch(sb, '\n');
if (need_8bit_cte == 0) {
@@ -2319,7 +2314,7 @@ void pretty_print_commit(struct pretty_print_context *pp,
}
pp_header(pp, encoding, commit, &msg, sb);
if (pp->fmt != CMIT_FMT_ONELINE && !pp->print_email_subject) {
if (pp->fmt != CMIT_FMT_ONELINE && !cmit_fmt_is_mail(pp->fmt)) {
strbuf_addch(sb, '\n');
}