[PATCH 3/3] git-svn log: handle unreachable revisions like "svn log"

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When unreachable revisions are given to "svn log", it displays all commit
logs in the given range that exist in the current tree.  (If no commit
logs are found in the current tree, it simply prints a single commit log
separator.)  This patch makes "git-svn log" behave the same way.

Ten tests added to t/t9116-git-svn-log.sh.

Signed-off-by: David D Kilzer <ddkilzer@xxxxxxxxxx>
---
 git-svn.perl           |   58 ++++++++++++++++++++++++++++--------------
 t/t9116-git-svn-log.sh |   66 ++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 105 insertions(+), 19 deletions(-)

diff --git a/git-svn.perl b/git-svn.perl
index 39585d8..c584715 100755
--- a/git-svn.perl
+++ b/git-svn.perl
@@ -2257,9 +2257,10 @@ sub rev_db_get {
 }
 
 sub find_rev_before {
-	my ($self, $rev, $eq_ok) = @_;
+	my ($self, $rev, $eq_ok, $min_rev) = @_;
 	--$rev unless $eq_ok;
-	while ($rev > 0) {
+	$min_rev ||= 1;
+	while ($rev >= $min_rev) {
 		if (my $c = $self->rev_db_get($rev)) {
 			return ($rev, $c);
 		}
@@ -2268,6 +2269,19 @@ sub find_rev_before {
 	return (undef, undef);
 }
 
+sub find_rev_after {
+	my ($self, $rev, $eq_ok, $max_rev) = @_;
+	++$rev unless $eq_ok;
+	$max_rev ||= $self->rev_db_max();
+	while ($rev <= $max_rev) {
+		if (my $c = $self->rev_db_get($rev)) {
+			return ($rev, $c);
+		}
+		++$rev;
+	}
+	return (undef, undef);
+}
+
 sub _new {
 	my ($class, $repo_id, $ref_id, $path) = @_;
 	unless (defined $repo_id && length $repo_id) {
@@ -3587,19 +3601,19 @@ sub git_svn_log_cmd {
 			push @cmd, $c;
 		}
 	} elsif (defined $r_max) {
-		my ($c_min, $c_max);
-		$c_max = $gs->rev_db_get($r_max);
-		$c_min = $gs->rev_db_get($r_min);
-		if (defined $c_min && defined $c_max) {
-			if ($r_max > $r_min) {
-				push @cmd, "--boundary", "$c_min..$c_max";
-			} else {
-				push @cmd, "--boundary", "$c_max..$c_min";
-			}
-		} elsif ($r_max > $r_min) {
-			push @cmd, $c_max;
+		if ($r_max < $r_min) {
+			($r_min, $r_max) = ($r_max, $r_min);
+		}
+		my (undef, $c_max) = $gs->find_rev_before($r_max, 1, $r_min);
+		my (undef, $c_min) = $gs->find_rev_after($r_min, 1, $r_max);
+		# If there are no commits in the range, both $c_max and $c_min
+		# will be undefined.  If there is at least 1 commit in the
+		# range, both will be defined.
+		return () if !defined $c_min;
+		if ($c_min eq $c_max) {
+			push @cmd, '--max-count=1', $c_min;
 		} else {
-			push @cmd, $c_min;
+			push @cmd, '--boundary', "$c_min..$c_max";
 		}
 	}
 	return (@cmd, @files);
@@ -3705,9 +3719,13 @@ sub show_commit_changed_paths {
 	print "Changed paths:\n", @{$c->{changed}};
 }
 
+sub commit_log_separator {
+    return ('-' x 72) . "\n";
+}
+
 sub show_commit_normal {
 	my ($c) = @_;
-	print '-' x72, "\nr$c->{r} | ";
+	print commit_log_separator(), "r$c->{r} | ";
 	print "$c->{c} | " if $show_commit;
 	print "$c->{a} | ", strftime("%Y-%m-%d %H:%M:%S %z (%a, %d %b %Y)",
 				 localtime($c->{t_utc})), ' | ';
@@ -3768,6 +3786,10 @@ sub cmd_show_log {
 
 	config_pager();
 	@args = git_svn_log_cmd($r_min, $r_max, @args);
+	if (!@args) {
+		print commit_log_separator() unless $incremental || $oneline;
+		return;
+	}
 	my $log = command_output_pipe(@args);
 	run_pager();
 	my (@k, $c, $d, $stat);
@@ -3816,14 +3838,12 @@ sub cmd_show_log {
 		process_commit($c, $r_min, $r_max, \@k);
 	}
 	if (@k) {
-		my $swap = $r_max;
-		$r_max = $r_min;
-		$r_min = $swap;
+		($r_min, $r_max) = ($r_max, $r_min);
 		process_commit($_, $r_min, $r_max) foreach reverse @k;
 	}
 out:
 	close $log;
-	print '-' x72,"\n" unless $incremental || $oneline;
+	print commit_log_separator() unless $incremental || $oneline;
 }
 
 package Git::SVN::Migration;
diff --git a/t/t9116-git-svn-log.sh b/t/t9116-git-svn-log.sh
index 5000892..56dd8fe 100755
--- a/t/t9116-git-svn-log.sh
+++ b/t/t9116-git-svn-log.sh
@@ -30,6 +30,12 @@ test_expect_success 'setup repository and import' "
 	git reset --hard trunk &&
 	echo aye >> README &&
 	git commit -a -m aye &&
+	git svn dcommit &&
+	git reset --hard b &&
+	echo spy >> README &&
+	git commit -a -m spy &&
+	echo try >> README &&
+	git commit -a -m try &&
 	git svn dcommit
 	"
 
@@ -59,4 +65,64 @@ test_expect_success 'test descending revision range' "
 	git svn log -r 4:1 | grep '^r[0-9]' | cut -d'|' -f1 | diff -u expected-range-r4-r2-r1 -
 	"
 
+printf 'r1 \nr2 \n' > expected-range-r1-r2
+
+test_expect_success 'test ascending revision range with unreachable revision' "
+	git reset --hard trunk &&
+	git svn log -r 1:3 | grep '^r[0-9]' | cut -d'|' -f1 | diff -u expected-range-r1-r2 -
+	"
+
+printf 'r2 \nr1 \n' > expected-range-r2-r1
+
+test_expect_success 'test descending revision range with unreachable revision' "
+	git reset --hard trunk &&
+	git svn log -r 3:1 | grep '^r[0-9]' | cut -d'|' -f1 | diff -u expected-range-r2-r1 -
+	"
+
+printf 'r2 \n' > expected-range-r2
+
+test_expect_success 'test ascending revision range with unreachable upper boundary revision and 1 commit' "
+	git reset --hard trunk &&
+	git svn log -r 2:3 | grep '^r[0-9]' | cut -d'|' -f1 | diff -u expected-range-r2 -
+	"
+
+test_expect_success 'test descending revision range with unreachable upper boundary revision and 1 commit' "
+	git reset --hard trunk &&
+	git svn log -r 3:2 | grep '^r[0-9]' | cut -d'|' -f1 | diff -u expected-range-r2 -
+	"
+
+printf 'r4 \n' > expected-range-r4
+
+test_expect_success 'test ascending revision range with unreachable lower boundary revision and 1 commit' "
+	git reset --hard trunk &&
+	git svn log -r 3:4 | grep '^r[0-9]' | cut -d'|' -f1 | diff -u expected-range-r4 -
+	"
+
+test_expect_success 'test descending revision range with unreachable lower boundary revision and 1 commit' "
+	git reset --hard trunk &&
+	git svn log -r 4:3 | grep '^r[0-9]' | cut -d'|' -f1 | diff -u expected-range-r4 -
+	"
+
+echo ------------------------------------------------------------------------ > expected-separator
+
+test_expect_success 'test ascending revision range with unreachable boundary revisions and no commits' "
+	git reset --hard trunk &&
+	git svn log -r 5:6 | diff -u expected-separator -
+	"
+
+test_expect_success 'test descending revision range with unreachable boundary revisions and no commits' "
+	git reset --hard trunk &&
+	git svn log -r 6:5 | diff -u expected-separator -
+	"
+
+test_expect_success 'test ascending revision range with unreachable boundary revisions and 1 commit' "
+	git reset --hard trunk &&
+	git svn log -r 3:5 | grep '^r[0-9]' | cut -d'|' -f1 | diff -u expected-range-r4 -
+	"
+
+test_expect_success 'test descending revision range with unreachable boundary revisions and 1 commit' "
+	git reset --hard trunk &&
+	git svn log -r 5:3 | grep '^r[0-9]' | cut -d'|' -f1 | diff -u expected-range-r4 -
+	"
+
 test_done
-- 
1.5.3.4

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