tig.pl: Spawn a pager.

[config/dotfiles.git] / tig.pl

diff --git a/tig.pl b/tig.pl
index 5fc7625ea46ff91162aab61c897dc3fdc06790f3..0d80e1fcb56b55a0d7dc1141624458e746e11539 100755 (executable)
--- a/tig.pl
+++ b/tig.pl
@@ -40,8 +40,23 @@ my $format = '%x00'         # separator from --graph
            . '%an' . '%x00' # author name
            . '%s'  . '%x00' # subject
            . '%d';          # ref names
-my $cmd = "git log --all --graph --format='$format'";
-open my $fh, '-|', $cmd or die $!;
+my @cmd = ('git', 'log', '--all', '--graph', "--format=$format");
+open my $fh, '-|', @cmd or die $!;
+
+my $pager = $ENV{PAGER};
+# Try to find an usable pager without searching $PATH.
+if (not defined $pager) {
+    foreach my $path (qw(/usr/bin/less /bin/less /usr/bin/more /bin/more)) {
+        next if not -x $path;
+
+        $pager = $path;
+        last;
+    }
+}
+# Use a pager if STDOUT is a terminal.
+if (-t STDOUT and defined $pager) {
+    open STDOUT, '|-', $pager or die $!;
+}
 
 while (my $line = <$fh>) {
     # History graph line.
@@ -51,7 +66,7 @@ while (my $line = <$fh>) {
     }
 
     # Commit line.
-    $line =~ /^([ *|]+)\x00(.+)\x00(.+)\x00(.+)\x00(.+)\x00(.*)$/
+    $line =~ /^([ *|.-]+)\x00(.+)\x00(.+)\x00(.+)\x00(.+)\x00(.*)$/
         or die $line;
     my $prefix  = $1;
     my $hash    = colored($2, $color_hash);
@@ -94,3 +109,9 @@ while (my $line = <$fh>) {
 }
 
 close $fh or die $!;
+
+# Necessary for the redirection to a pager or the pager terminates after our
+# script finishes without displaying all data.
+if (defined $pager) {
+    close STDOUT or die $!;
+}