From 159801abf91d5a01537346fcb2e3e447dfef27cc Mon Sep 17 00:00:00 2001
From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Fri, 14 Jul 2017 12:23:31 +0100
Subject: [PATCH] git-debrebase: wip debug, fixes etc.

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

diff --git a/git-debrebase b/git-debrebase
index 15196fe4..982423a6 100755
--- a/git-debrebase
+++ b/git-debrebase
@@ -108,6 +108,7 @@ use Memoize;
 use Carp;
 use POSIX;
 use Data::Dumper;
+use Getopt::Long qw(:config posix_default gnu_compat bundling);
 
 use Debian::Dgit qw(:DEFAULT $wa);
 
@@ -155,25 +156,24 @@ sub get_differs ($$) {
 
     my $differs = 0;
 
-    my $f;
     my $rundiff = sub {
 	my ($opts, $sfx, $fn) = @_;
 	$opts //= [qw(--name-only)];
 	my @cmd = (@git, qw(diff-tree -z --no-renames));
 	push @cmd, @$opts;
 	push @cmd, "$_:$sfx" foreach $x, $y;
-	my $diffs = cmdoutput @cmd, $x, $y;
-	foreach $f (split /\0/, $diffs) { $fn->(); }
+	my $diffs = cmdoutput @cmd;
+	foreach (split /\0/, $diffs) { $fn->(); }
     };
 
     $rundiff->(undef, '', sub {
-        $differs |= $f eq 'debian' ? D_DEB : D_UPS;
+        $differs |= $_ eq 'debian' ? D_DEB : D_UPS;
     });
 
     if ($differs & D_DEB) {
 	$differs &= ~D_DEB;
 	$rundiff->(undef, ':debian', sub {
-            $differs |= $f eq 'patches' ? D_PAT_OTH : D_DEB;
+            $differs |= $_ eq 'patches' ? D_PAT_OTH : D_DEB;
 	});
 	die "mysterious debian changes $x..$y"
 	    unless $differs & (D_PAT_OTH|D_DEB);
@@ -189,12 +189,12 @@ sub get_differs ($$) {
 	$rundiff->([qw(--name-status)], ':debian/patches', sub {
             no warnings qw(exiting);
             if (!defined $mode) {
-		$mode = $f;  next;
+		$mode = $_;  next;
 	    }
 	    my $ok;
-	    if ($mode eq 'A' && $f !~ m/(?:^|\.)series$/s) {
+	    if ($mode eq 'A' && !m/(?:^|\.)series$/s) {
 		$ok = 1;
-	    } elsif ($mode eq 'M' && $f eq 'series') {
+	    } elsif ($mode eq 'M' && $_ eq 'series') {
 		my $x_s = git_cat_file "$x:debian/patches/series", 'blob';
 		my $y_s = git_cat_file "$y:debian/patches/series", 'blob';
 		chomp $x_s;  $x_s .= "\n";
@@ -209,6 +209,8 @@ sub get_differs ($$) {
 	    unless $differs & (D_PAT_ADD|D_PAT_OTH);
     }
 
+    printdebug sprintf "get_differs %s, %s = %#x\n", $x, $y, $differs;
+
     return $differs;
 }
 
@@ -267,7 +269,7 @@ sub classify ($) {
     my ($h,$m) = get_commit $objid;
 
     my ($t) = $h =~ m/^tree (\w+)$/m or die $objid;
-    my (@ph) = $h =~ m/^parent (\w+)$/m;
+    my (@ph) = $h =~ m/^parent (\w+)$/mg;
     my @p;
 
     my $r = {
@@ -286,14 +288,24 @@ sub classify ($) {
         };
     }
 
+    printdebug "classify $objid \$t=$t \@p",
+	(map { sprintf " %s/%#x", $_->{CommitId}, $_->{Differs} } @p),
+	"\n";
+
     my $classify = sub {
 	my ($type, @rest) = @_;
 	$r = { %$r, Type => $type, @rest };
+	if ($debuglevel) {
+	    my $dd = new Data::Dumper [ $r ];
+	    Terse $dd 1; Indent $dd 0; Useqq $dd 1;
+	    printdebug " = $type ".(Dump $dd)."\n";
+	}
 	return $r;
     };
     my $unknown = sub {
 	my ($why) = @_;
 	$r = { %$r, Type => qw(Unknown) };
+	printdebug " ** Unknown\n";
 	return $r;
     };
 
@@ -474,7 +486,7 @@ sub walk ($;$$) {
 	    $cur = $p0;
 	    next;
 	} elsif ($ty eq 'Pseudomerge') {
-	    print $report " Contributor=$ty->{Contributor}" if $report;
+	    print $report " Contributor=$cl->{Contributor}" if $report;
 	    push @pseudomerges, $cl;
 	    $rewrite_from_here->();
 	    $cur = $ty->{Contributor};
@@ -665,10 +677,13 @@ sub cmd_analyse () {
 	$old = get_head();
     }
     my ($dummy,$breakwater) = walk $old, 1,*STDOUT;
-    print "$breakwater BREAKWATER\n";
     STDOUT->error and die $!;
 }
 
+GetOptions("D+" => \$debuglevel) or die badusage "bad options\n";
+initdebug('git-debrebase ');
+enabledebug if $debuglevel;
+
 my $toplevel = cmdoutput @git, qw(rev-parse --show-toplevel);
 chdir $toplevel or die "chdir $toplevel: $!";
 
-- 
2.30.2