libperl-git: refactor Git::config_*

Move common parts of Git::config(), Git::config_bool(), Git::config_int()
and Git::config_path() into _config_common() helper.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

perl/Git.pm

@@ -570,30 +570,10 @@ does. In scalar context requires the variable to be set only one time
 (exception is thrown otherwise), in array context returns allows the
 variable to be set multiple times and returns all the values.
 
-This currently wraps command('config') so it is not so fast.
-
 =cut
 
 sub config {
-	my ($self, $var) = _maybe_self(@_);
-
-	try {
-		my @cmd = ('config');
-		unshift @cmd, $self if $self;
-		if (wantarray) {
-			return command(@cmd, '--get-all', $var);
-		} else {
-			return command_oneline(@cmd, '--get', $var);
-		}
-	} catch Git::Error::Command with {
-		my $E = shift;
-		if ($E->value() == 1) {
-			# Key not found.
-			return;
-		} else {
-			throw $E;
-		}
-	};
+	return _config_common({}, @_);
 }
 
 
@@ -603,28 +583,18 @@ Retrieve the bool configuration C<VARIABLE>. The return value
 is usable as a boolean in perl (and C<undef> if it's not defined,
 of course).
 
-This currently wraps command('config') so it is not so fast.
-
 =cut
 
 sub config_bool {
-	my ($self, $var) = _maybe_self(@_);
+	my $val = scalar _config_common({'kind' => '--bool'}, @_);
 
-	try {
-		my @cmd = ('config', '--bool', '--get', $var);
-		unshift @cmd, $self if $self;
-		my $val = command_oneline(@cmd);
-		return undef unless defined $val;
+	# Do not rewrite this as return (defined $val && $val eq 'true')
+	# as some callers do care what kind of falsehood they receive.
+	if (!defined $val) {
+		return undef;
+	} else {
 		return $val eq 'true';
-	} catch Git::Error::Command with {
-		my $E = shift;
-		if ($E->value() == 1) {
-			# Key not found.
-			return undef;
-		} else {
-			throw $E;
-		}
-	};
+	}
 }
 
 
@@ -633,32 +603,13 @@ sub config_bool {
 Retrieve the path configuration C<VARIABLE>. The return value
 is an expanded path or C<undef> if it's not defined.
 
-This currently wraps command('config') so it is not so fast.
-
 =cut
 
 sub config_path {
-	my ($self, $var) = _maybe_self(@_);
-
-	try {
-		my @cmd = ('config', '--path');
-		unshift @cmd, $self if $self;
-		if (wantarray) {
-			return command(@cmd, '--get-all', $var);
-		} else {
-			return command_oneline(@cmd, '--get', $var);
-		}
-	} catch Git::Error::Command with {
-		my $E = shift;
-		if ($E->value() == 1) {
-			# Key not found.
-			return undef;
-		} else {
-			throw $E;
-		}
-	};
+	return _config_common({'kind' => '--path'}, @_);
 }
 
+
 =item config_int ( VARIABLE )
 
 Retrieve the integer configuration C<VARIABLE>. The return value
@@ -667,22 +618,31 @@ or 'g' in the config file will cause the value to be multiplied
 by 1024, 1048576 (1024^2), or 1073741824 (1024^3) prior to output.
 It would return C<undef> if configuration variable is not defined,
 
-This currently wraps command('config') so it is not so fast.
-
 =cut
 
 sub config_int {
+	return scalar _config_common({'kind' => '--int'}, @_);
+}
+
+# Common subroutine to implement bulk of what the config* family of methods
+# do. This curently wraps command('config') so it is not so fast.
+sub _config_common {
+	my ($opts) = shift @_;
 	my ($self, $var) = _maybe_self(@_);
 
 	try {
-		my @cmd = ('config', '--int', '--get', $var);
+		my @cmd = ('config', $opts->{'kind'} ? $opts->{'kind'} : ());
 		unshift @cmd, $self if $self;
-		return command_oneline(@cmd);
+		if (wantarray) {
+			return command(@cmd, '--get-all', $var);
+		} else {
+			return command_oneline(@cmd, '--get', $var);
+		}
 	} catch Git::Error::Command with {
 		my $E = shift;
 		if ($E->value() == 1) {
 			# Key not found.
-			return undef;
+			return;
 		} else {
 			throw $E;
 		}