[PATCH 5/6] t0021/rot13-filter: add capability functions

[Christian Couder]

Add functions to help read and write capabilities.
These functions will be reused in following patches.

Signed-off-by: Christian Couder <chrisc...@tuxfamily.org>
---
 t/t0021/rot13-filter.pl | 40 ++++++++++++++++++++++++++++++++--------
 1 file changed, 32 insertions(+), 8 deletions(-)

diff --git a/t/t0021/rot13-filter.pl b/t/t0021/rot13-filter.pl
index 278fc6f534..ba18b207c6 100644
--- a/t/t0021/rot13-filter.pl
+++ b/t/t0021/rot13-filter.pl
@@ -116,20 +116,44 @@ sub packet_initialize {
        packet_flush();
 }
 
+sub packet_read_capabilities {
+       my @cap;
+       while (1) {
+               my ( $res, $buf ) = packet_bin_read();
+               return ( $res, @cap ) if ( $res != 0 );
+               unless ( $buf =~ s/\n$// ) {
+                       die "A non-binary line MUST be terminated by an LF.\n"
+                           . "Received: '$buf'";
+               }
+               die "bad capability buf: '$buf'" unless ( $buf =~ 
s/capability=// );
+               push @cap, $buf;
+       }
+}
+
+sub packet_read_and_check_capabilities {
+       my @local_caps = @_;
+       my @remote_res_caps = packet_read_capabilities();
+       my $res = shift @remote_res_caps;
+       my %remote_caps = map { $_ => 1 } @remote_res_caps;
+       foreach (@local_caps) {
+               die "'$_' capability not available" unless 
(exists($remote_caps{$_}));
+       }
+       return $res;
+}
+
+sub packet_write_capabilities {
+       packet_txt_write( "capability=" . $_ ) foreach (@_);
+       packet_flush();
+}
+
 print $debug "START\n";
 $debug->flush();
 
 packet_initialize("git-filter", 2);
 
-( packet_txt_read() eq ( 0, "capability=clean" ) )  || die "bad capability";
-( packet_txt_read() eq ( 0, "capability=smudge" ) ) || die "bad capability";
-( packet_txt_read() eq ( 0, "capability=delay" ) )  || die "bad capability";
-( packet_bin_read() eq ( 1, "" ) )                  || die "bad capability 
end";
+packet_read_and_check_capabilities("clean", "smudge", "delay");
+packet_write_capabilities(@capabilities);
 
-foreach (@capabilities) {
-       packet_txt_write( "capability=" . $_ );
-}
-packet_flush();
 print $debug "init handshake complete\n";
 $debug->flush();
 
-- 
2.15.0.rc1.106.g7e97f58a41