merge(3p/git): Merge git subtree at v2.29.2 r/1890

This also bumps the stable nixpkgs to 20.09 as of 2020-11-21, because
there is some breakage in the git build related to the netrc
credentials helper which someone has taken care of in nixpkgs.

The stable channel is not used for anything other than git, so this
should be fine.

Change-Id: I3575a19dab09e1e9556cf8231d717de9890484fb

1 files changed, 68 insertions, 23 deletions

diff --git a/third_party/git/pretty.c b/third_party/git/pretty.c
index e4ed14effe..7a7708a0ea 100644
--- a/third_party/git/pretty.c
+++ b/third_party/git/pretty.c
@@ -20,6 +20,7 @@ static struct cmt_fmt_map {
 	int is_tformat;
 	int expand_tabs_in_log;
 	int is_alias;
+	enum date_mode_type default_date_mode_type;
 	const char *user_format;
 } *commit_formats;
 static size_t builtin_formats_len;
@@ -97,7 +98,9 @@ static void setup_commit_formats(void)
 		{ "mboxrd",	CMIT_FMT_MBOXRD,	0,	0 },
 		{ "fuller",	CMIT_FMT_FULLER,	0,	8 },
 		{ "full",	CMIT_FMT_FULL,		0,	8 },
-		{ "oneline",	CMIT_FMT_ONELINE,	1,	0 }
+		{ "oneline",	CMIT_FMT_ONELINE,	1,	0 },
+		{ "reference",	CMIT_FMT_USERFORMAT,	1,	0,
+			0, DATE_SHORT, "%C(auto)%h (%s, %ad)" },
 		/*
 		 * Please update $__git_log_pretty_formats in
 		 * git-completion.bash when you add new formats.
@@ -181,6 +184,8 @@ void get_commit_format(const char *arg, struct rev_info *rev)
 	rev->commit_format = commit_format->format;
 	rev->use_terminator = commit_format->is_tformat;
 	rev->expand_tabs_in_log_default = commit_format->expand_tabs_in_log;
+	if (!rev->date_mode_explicit && commit_format->default_date_mode_type)
+		rev->date_mode.type = commit_format->default_date_mode_type;
 	if (commit_format->format == CMIT_FMT_USERFORMAT) {
 		save_user_format(rev, commit_format->user_format,
 				 commit_format->is_tformat);
@@ -469,7 +474,8 @@ void pp_user_info(struct pretty_print_context *pp,
 		}
 
 		strbuf_addstr(sb, "From: ");
-		if (needs_rfc2047_encoding(namebuf, namelen)) {
+		if (pp->encode_email_headers &&
+		    needs_rfc2047_encoding(namebuf, namelen)) {
 			add_rfc2047(sb, namebuf, namelen,
 				    encoding, RFC2047_ADDRESS);
 			max_length = 76; /* per rfc2047 */
@@ -696,7 +702,7 @@ static size_t format_person_part(struct strbuf *sb, char part,
 	mail = s.mail_begin;
 	maillen = s.mail_end - s.mail_begin;
 
-	if (part == 'N' || part == 'E') /* mailmap lookup */
+	if (part == 'N' || part == 'E' || part == 'L') /* mailmap lookup */
 		mailmap_name(&mail, &maillen, &name, &namelen);
 	if (part == 'n' || part == 'N') {	/* name */
 		strbuf_add(sb, name, namelen);
@@ -706,6 +712,13 @@ static size_t format_person_part(struct strbuf *sb, char part,
 		strbuf_add(sb, mail, maillen);
 		return placeholder_len;
 	}
+	if (part == 'l' || part == 'L') {	/* local-part */
+		const char *at = memchr(mail, '@', maillen);
+		if (at)
+			maillen = at - mail;
+		strbuf_add(sb, mail, maillen);
+		return placeholder_len;
+	}
 
 	if (!s.date_begin)
 		goto skip;
@@ -731,6 +744,9 @@ static size_t format_person_part(struct strbuf *sb, char part,
 	case 'I':	/* date, ISO 8601 strict */
 		strbuf_addstr(sb, show_ident_date(&s, DATE_MODE(ISO8601_STRICT)));
 		return placeholder_len;
+	case 's':
+		strbuf_addstr(sb, show_ident_date(&s, DATE_MODE(SHORT)));
+		return placeholder_len;
 	}
 
 skip:
@@ -823,21 +839,22 @@ static int istitlechar(char c)
 		(c >= '0' && c <= '9') || c == '.' || c == '_';
 }
 
-static void format_sanitized_subject(struct strbuf *sb, const char *msg)
+void format_sanitized_subject(struct strbuf *sb, const char *msg, size_t len)
 {
 	size_t trimlen;
 	size_t start_len = sb->len;
 	int space = 2;
+	int i;
 
-	for (; *msg && *msg != '\n'; msg++) {
-		if (istitlechar(*msg)) {
+	for (i = 0; i < len; i++) {
+		if (istitlechar(msg[i])) {
 			if (space == 1)
 				strbuf_addch(sb, '-');
 			space = 0;
-			strbuf_addch(sb, *msg);
-			if (*msg == '.')
-				while (*(msg+1) == '.')
-					msg++;
+			strbuf_addch(sb, msg[i]);
+			if (msg[i] == '.')
+				while (msg[i+1] == '.')
+					i++;
 		} else
 			space |= 1;
 	}
@@ -1139,7 +1156,7 @@ static size_t format_commit_one(struct strbuf *sb, /* in UTF-8 */
 	const struct commit *commit = c->commit;
 	const char *msg = c->message;
 	struct commit_list *p;
-	const char *arg;
+	const char *arg, *eol;
 	size_t res;
 	char **slot;
 
@@ -1239,11 +1256,9 @@ static size_t format_commit_one(struct strbuf *sb, /* in UTF-8 */
 		strbuf_addstr(sb, get_revision_mark(NULL, commit));
 		return 1;
 	case 'd':
-		load_ref_decorations(NULL, DECORATE_SHORT_REFS);
 		format_decorations(sb, commit, c->auto_color);
 		return 1;
 	case 'D':
-		load_ref_decorations(NULL, DECORATE_SHORT_REFS);
 		format_decorations_extended(sb, commit, c->auto_color, "", ", ", "");
 		return 1;
 	case 'S':		/* tag/branch like --source */
@@ -1298,9 +1313,18 @@ static size_t format_commit_one(struct strbuf *sb, /* in UTF-8 */
 		case '?':
 			switch (c->signature_check.result) {
 			case 'G':
+				switch (c->signature_check.trust_level) {
+				case TRUST_UNDEFINED:
+				case TRUST_NEVER:
+					strbuf_addch(sb, 'U');
+					break;
+				default:
+					strbuf_addch(sb, 'G');
+					break;
+				}
+				break;
 			case 'B':
 			case 'E':
-			case 'U':
 			case 'N':
 			case 'X':
 			case 'Y':
@@ -1324,6 +1348,25 @@ static size_t format_commit_one(struct strbuf *sb, /* in UTF-8 */
 			if (c->signature_check.primary_key_fingerprint)
 				strbuf_addstr(sb, c->signature_check.primary_key_fingerprint);
 			break;
+		case 'T':
+			switch (c->signature_check.trust_level) {
+			case TRUST_UNDEFINED:
+				strbuf_addstr(sb, "undefined");
+				break;
+			case TRUST_NEVER:
+				strbuf_addstr(sb, "never");
+				break;
+			case TRUST_MARGINAL:
+				strbuf_addstr(sb, "marginal");
+				break;
+			case TRUST_FULLY:
+				strbuf_addstr(sb, "fully");
+				break;
+			case TRUST_ULTIMATE:
+				strbuf_addstr(sb, "ultimate");
+				break;
+			}
+			break;
 		default:
 			return 0;
 		}
@@ -1363,7 +1406,8 @@ static size_t format_commit_one(struct strbuf *sb, /* in UTF-8 */
 		format_subject(sb, msg + c->subject_off, " ");
 		return 1;
 	case 'f':	/* sanitized subject */
-		format_sanitized_subject(sb, msg + c->subject_off);
+		eol = strchrnul(msg + c->subject_off, '\n');
+		format_sanitized_subject(sb, msg + c->subject_off, eol - (msg + c->subject_off));
 		return 1;
 	case 'b':	/* body */
 		strbuf_addstr(sb, msg + c->body_off);
@@ -1568,9 +1612,9 @@ static size_t format_commit_item(struct strbuf *sb, /* in UTF-8 */
 			strbuf_setlen(sb, sb->len - 1);
 	} else if (orig_len != sb->len) {
 		if (magic == ADD_LF_BEFORE_NON_EMPTY)
-			strbuf_insert(sb, orig_len, "\n", 1);
+			strbuf_insertstr(sb, orig_len, "\n");
 		else if (magic == ADD_SP_BEFORE_NON_EMPTY)
-			strbuf_insert(sb, orig_len, " ", 1);
+			strbuf_insertstr(sb, orig_len, " ");
 	}
 	return consumed + 1;
 }
@@ -1612,14 +1656,14 @@ void repo_format_commit_message(struct repository *r,
 				const char *format, struct strbuf *sb,
 				const struct pretty_print_context *pretty_ctx)
 {
-	struct format_commit_context context;
+	struct format_commit_context context = {
+		.commit = commit,
+		.pretty_ctx = pretty_ctx,
+		.wrap_start = sb->len
+	};
 	const char *output_enc = pretty_ctx->output_encoding;
 	const char *utf8 = "UTF-8";
 
-	memset(&context, 0, sizeof(context));
-	context.commit = commit;
-	context.pretty_ctx = pretty_ctx;
-	context.wrap_start = sb->len;
 	/*
 	 * convert a commit message to UTF-8 first
 	 * as far as 'format_commit_item' assumes it in UTF-8
@@ -1726,7 +1770,8 @@ void pp_title_line(struct pretty_print_context *pp,
 	if (pp->print_email_subject) {
 		if (pp->rev)
 			fmt_output_email_subject(sb, pp->rev);
-		if (needs_rfc2047_encoding(title.buf, title.len))
+		if (pp->encode_email_headers &&
+		    needs_rfc2047_encoding(title.buf, title.len))
 			add_rfc2047(sb, title.buf, title.len,
 						encoding, RFC2047_SUBJECT);
 		else