From 85644f90c4b887d4b60b175f6cda8446e1e5bd29 Mon Sep 17 00:00:00 2001
From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Thu, 15 Jun 2017 00:18:12 +0100
Subject: [PATCH] git-debrebase: introduce build_start

---
 git-debrebase | 21 ++++++++++-----------
 1 file changed, 10 insertions(+), 11 deletions(-)

diff --git a/git-debrebase b/git-debrebase
index 35787156..7b64bf51 100755
--- a/git-debrebase
+++ b/git-debrebase
@@ -342,6 +342,12 @@ sub walk {
 	push @brw_cl, $sp_cl;
 	push @processed, $sp_cl;
     };
+    my $build_start = sub {
+	my ($msg, $parents) = @_;
+	$prline->(" $msg");
+	push @brw_cl, { ExactlyParents => $parents };
+	no qw(exiting); last;
+    };
 
     my $cur = $input;
 
@@ -365,9 +371,7 @@ sub walk {
 
     for (;;) {
 	if (!defined $cur) {
-	    push @brw_cl, { ExactlyParents => [] };
-	    $prline->("Origin");
-	    last;
+	    $build_start->('Origin', []);
 	}
 	$cl = classify $cur;
 	my $ty = $cl->{Type};
@@ -385,8 +389,7 @@ sub walk {
 	    $cur = $p0;
 	    next;
 	} elsif ($ty eq 'BreakwaterStart') {
-	    push @brw_cl, { ExactlyParents => [$cur] };
-	    last;
+	    $build_start('FirstPackaging',[$cur]};
 	} elsif ($ty eq 'Upstream') {
 	    push @upp_cl, $cl;
 	    $cur = $p0;
@@ -409,9 +412,7 @@ sub walk {
 	    $cur = $ty->{Contributor};
 	    next;
 	} elsif ($ty eq 'BreakwaterUpstreamMerge') {
-	    push @brw_cl, { ExactlyParents => [$cur] };
-	    $prline->("PreviousBreakwater");
-	    last;
+	    $build_start->("PreviousBreakwater", [$cur]);
 	} elsif ($ty eq 'DgitImportUnpatched') {
 	    my $pm = $pseudomerges[-1];
 	    if (defined $pm) {
@@ -471,12 +472,10 @@ sub walk {
 		# is already in valid breakwater format, with the
 		# patches as commits.
 		printf $report " NoPM" if $report;
-		$prline->(" ImportOrigin");
 		# last thing we processed will have been the first patch,
 		# if there is one; which is fine, so no need to rewrite
 		# on account of this import
-		push @brw_cl, { ExactlyParents => [$cur] };
-		last;
+		$build_start->("ImportOrigin",[$cur]);
 	    }
 	    die "$ty ?";
         } else {
-- 
2.30.2