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shortlog: replace hand-parsing of author with pretty-printer
When gathering the author and oneline subject for each commit, we hand-parse the commit headers to find the "author" line, and then continue past to the blank line at the end of the header. We can replace this tricky hand-parsing by simply asking the pretty-printer for the relevant items. This also decouples the author and oneline parsing, opening up some new optimizations in further commits. One reason to avoid the pretty-printer is that it might be less efficient than hand-parsing. However, I measured no slowdown at all running "git shortlog -ns HEAD" on linux.git. As a bonus, we also fix a memory leak in the (uncommon) case that the author field is blank. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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@ -113,45 +113,35 @@ static void read_from_stdin(struct shortlog *log)
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void shortlog_add_commit(struct shortlog *log, struct commit *commit)
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{
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const char *author = NULL, *buffer;
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struct strbuf buf = STRBUF_INIT;
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struct strbuf ufbuf = STRBUF_INIT;
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struct strbuf author = STRBUF_INIT;
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struct strbuf oneline = STRBUF_INIT;
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struct pretty_print_context ctx = {0};
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pp_commit_easy(CMIT_FMT_RAW, commit, &buf);
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buffer = buf.buf;
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while (*buffer && *buffer != '\n') {
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const char *eol = strchr(buffer, '\n');
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ctx.fmt = CMIT_FMT_USERFORMAT;
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ctx.abbrev = log->abbrev;
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ctx.subject = "";
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ctx.after_subject = "";
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ctx.date_mode.type = DATE_NORMAL;
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ctx.output_encoding = get_log_output_encoding();
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if (eol == NULL)
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eol = buffer + strlen(buffer);
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else
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eol++;
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if (starts_with(buffer, "author "))
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author = buffer + 7;
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buffer = eol;
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}
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if (!author) {
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format_commit_message(commit, "%an <%ae>", &author, &ctx);
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/* we can detect a total failure only by seeing " <>" in the output */
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if (author.len <= 3) {
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warning(_("Missing author: %s"),
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oid_to_hex(&commit->object.oid));
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return;
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goto out;
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}
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if (log->user_format) {
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struct pretty_print_context ctx = {0};
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ctx.fmt = CMIT_FMT_USERFORMAT;
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ctx.abbrev = log->abbrev;
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ctx.subject = "";
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ctx.after_subject = "";
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ctx.date_mode.type = DATE_NORMAL;
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ctx.output_encoding = get_log_output_encoding();
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pretty_print_commit(&ctx, commit, &ufbuf);
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buffer = ufbuf.buf;
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} else if (*buffer) {
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buffer++;
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}
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insert_one_record(log, author, !*buffer ? "<none>" : buffer);
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strbuf_release(&ufbuf);
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strbuf_release(&buf);
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if (log->user_format)
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pretty_print_commit(&ctx, commit, &oneline);
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else
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format_commit_message(commit, "%s", &oneline, &ctx);
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insert_one_record(log, author.buf, oneline.len ? oneline.buf : "<none>");
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out:
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strbuf_release(&author);
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strbuf_release(&oneline);
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}
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static void get_from_rev(struct rev_info *rev, struct shortlog *log)
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