pretty: Respect --abbrev option

Prior to this, the output of git log -1 --format=%h was always 7
characters long, without regard to whether --abbrev had been passed.

Signed-off-by: Will Palmer <wmpalmer@gmail.com>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin-shortlog.c

@@ -162,7 +162,7 @@ void shortlog_add_commit(struct shortlog *log, struct commit *commit)
 		    sha1_to_hex(commit->object.sha1));
 	if (log->user_format) {
 		struct pretty_print_context ctx = {0};
-		ctx.abbrev = DEFAULT_ABBREV;
+		ctx.abbrev = log->abbrev;
 		ctx.subject = "";
 		ctx.after_subject = "";
 		ctx.date_mode = DATE_NORMAL;
@@ -290,6 +290,7 @@ parse_done:
 	}
 
 	log.user_format = rev.commit_format == CMIT_FMT_USERFORMAT;
+	log.abbrev = rev.abbrev;
 
 	/* assume HEAD if from a tty */
 	if (!nongit && !rev.pending.nr && isatty(0))

pretty.c

@@ -716,7 +716,7 @@ static size_t format_commit_one(struct strbuf *sb, const char *placeholder,
 		if (add_again(sb, &c->abbrev_commit_hash))
 			return 1;
 		strbuf_addstr(sb, find_unique_abbrev(commit->object.sha1,
-		                                     DEFAULT_ABBREV));
+						     c->pretty_ctx->abbrev));
 		c->abbrev_commit_hash.len = sb->len - c->abbrev_commit_hash.off;
 		return 1;
 	case 'T':		/* tree hash */
@@ -726,7 +726,7 @@ static size_t format_commit_one(struct strbuf *sb, const char *placeholder,
 		if (add_again(sb, &c->abbrev_tree_hash))
 			return 1;
 		strbuf_addstr(sb, find_unique_abbrev(commit->tree->object.sha1,
-		                                     DEFAULT_ABBREV));
+						     c->pretty_ctx->abbrev));
 		c->abbrev_tree_hash.len = sb->len - c->abbrev_tree_hash.off;
 		return 1;
 	case 'P':		/* parent hashes */
@@ -743,7 +743,8 @@ static size_t format_commit_one(struct strbuf *sb, const char *placeholder,
 			if (p != commit->parents)
 				strbuf_addch(sb, ' ');
 			strbuf_addstr(sb, find_unique_abbrev(
-					p->item->object.sha1, DEFAULT_ABBREV));
+					p->item->object.sha1,
+					c->pretty_ctx->abbrev));
 		}
 		c->abbrev_parent_hashes.len = sb->len -
 		                              c->abbrev_parent_hashes.off;

shortlog.h

@@ -12,6 +12,7 @@ struct shortlog {
 	int in1;
 	int in2;
 	int user_format;
+	int abbrev;
 
 	char *common_repo_prefix;
 	int email;

t/t4201-shortlog.sh

@@ -79,7 +79,7 @@ test_expect_success 'pretty format' '
 	test_cmp expect log.predictable
 '
 
-test_expect_failure '--abbrev' '
+test_expect_success '--abbrev' '
 	sed s/SUBJECT/OBJID/ expect.template >expect &&
 	git shortlog --format="%h" --abbrev=5 HEAD >log &&
 	fuzz log >log.predictable &&

t/t6006-rev-list-format.sh

@@ -191,6 +191,31 @@ test_expect_success 'add LF before non-empty (2)' '
 	grep "^$" actual
 '
 
+test_expect_success '--abbrev' '
+	echo SHORT SHORT SHORT >expect2 &&
+	echo LONG LONG LONG >expect3 &&
+	git log -1 --format="%h %h %h" HEAD >actual1 &&
+	git log -1 --abbrev=5 --format="%h %h %h" HEAD >actual2 &&
+	git log -1 --abbrev=5 --format="%H %H %H" HEAD >actual3 &&
+	sed -e "s/$_x40/LONG/g" -e "s/$_x05/SHORT/g" <actual2 >fuzzy2 &&
+	sed -e "s/$_x40/LONG/g" -e "s/$_x05/SHORT/g" <actual3 >fuzzy3 &&
+	test_cmp expect2 fuzzy2 &&
+	test_cmp expect3 fuzzy3 &&
+	! test_cmp actual1 actual2
+'
+
+test_expect_success '%H is not affected by --abbrev-commit' '
+	git log -1 --format=%H --abbrev-commit --abbrev=20 HEAD >actual &&
+	len=$(wc -c <actual) &&
+	test $len = 41
+'
+
+test_expect_success '%h is not affected by --abbrev-commit' '
+	git log -1 --format=%h --abbrev-commit --abbrev=20 HEAD >actual &&
+	len=$(wc -c <actual) &&
+	test $len = 21
+'
+
 test_expect_success '"%h %gD: %gs" is same as git-reflog' '
 	git reflog >expect &&
 	git log -g --format="%h %gD: %gs" >actual &&
@@ -203,6 +228,12 @@ test_expect_success '"%h %gD: %gs" is same as git-reflog (with date)' '
 	test_cmp expect actual
 '
 
+test_expect_success '"%h %gD: %gs" is same as git-reflog (with --abbrev)' '
+	git reflog --abbrev=13 --date=raw >expect &&
+	git log -g --abbrev=13 --format="%h %gD: %gs" --date=raw >actual &&
+	test_cmp expect actual
+'
+
 test_expect_success '%gd shortens ref name' '
 	echo "master@{0}" >expect.gd-short &&
 	git log -g -1 --format=%gd refs/heads/master >actual.gd-short &&