From 6a8f914beb77ec4cc36ed0aecb0e5da31a450418 Mon Sep 17 00:00:00 2001
From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Tue, 14 Jul 2015 20:23:11 +0100
Subject: Memoise git config lookups (big speedup!)

---
 dgit | 37 ++++++++++++++++++++++++++-----------
 1 file changed, 26 insertions(+), 11 deletions(-)

(limited to 'dgit')

diff --git a/dgit b/dgit
index 1a2ee88..a051622 100755
--- a/dgit
+++ b/dgit
@@ -485,20 +485,35 @@ our %defcfg = ('dgit.default.distro' => 'debian',
 	       'dgit-distro.test-dummy.upload-host' => 'test-dummy',
                );
 
+sub git_get_config ($) {
+    my ($c) = @_;
+
+    our %git_get_config_memo;
+    if (exists $git_get_config_memo{$c}) {
+	return $git_get_config_memo{$c};
+    }
+
+    my $v;
+    my @cmd = (@git, qw(config --), $c);
+    {
+	local ($debuglevel) = $debuglevel-2;
+	$v = cmdoutput_errok @cmd;
+    };
+    if ($?==0) {
+    } elsif ($?==256) {
+	$v = undef;
+    } else {
+	failedcmd @cmd;
+    }
+    $git_get_config_memo{$c} = $v;
+    return $v;
+}
+
 sub cfg {
     foreach my $c (@_) {
 	return undef if $c =~ /RETURN-UNDEF/;
-	my @cmd = (@git, qw(config --), $c);
-	my $v;
-	{
-	    local ($debuglevel) = $debuglevel-2;
-	    $v = cmdoutput_errok @cmd;
-	};
-	if ($?==0) {
-	    return $v;
-	} elsif ($?!=256) {
-	    failedcmd @cmd;
-	}
+	my $v = git_get_config($c);
+	return $v if defined $v;
 	my $dv = $defcfg{$c};
 	return $dv if defined $dv;
     }
-- 
cgit v1.2.3