From 11feba1f44552f3232c52f4f2a55ff7f2f0c6175 Mon Sep 17 00:00:00 2001
From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Sun, 17 Jun 2018 00:36:55 +0100
Subject: [PATCH] Dgit.pm: gdr_ffq_prev_branchinfo: move from git-debrebase

dgit is going to want this too, for interoperability.

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
---
 Debian/Dgit.pm | 17 +++++++++++++++++
 git-debrebase  | 13 +------------
 2 files changed, 18 insertions(+), 12 deletions(-)

diff --git a/Debian/Dgit.pm b/Debian/Dgit.pm
index 32021805..960f505a 100644
--- a/Debian/Dgit.pm
+++ b/Debian/Dgit.pm
@@ -64,6 +64,7 @@ BEGIN {
                       shellquote printcmd messagequote
                       $negate_harmful_gitattrs
 		      changedir git_slurp_config_src
+		      gdr_ffq_prev_branchinfo
 		      playtree_setup);
     # implicitly uses $main::us
     %EXPORT_TAGS = ( policyflags => [qw(NOFFCHECK FRESHREPO NOCOMMITCHECK)],
@@ -514,6 +515,22 @@ sub git_slurp_config_src ($) {
     return $r;
 }
 
+sub gdr_ffq_prev_branchinfo ($) {
+    my ($symref) = @_;
+    # => ('status', "message", [$symref, $ffq_prev, $gdrlast])
+    # 'status' may be
+    #    branch         message is undef
+    #    weird-symref   } no $symref,
+    #    notbranch      }  no $ffq_prev
+    return ('detached', 'detached HEAD') unless defined $symref;
+    return ('weird-symref', 'HEAD symref is not to refs/')
+	unless $symref =~ m{^refs/};
+    my $ffq_prev = "refs/$ffq_refprefix/$'";
+    my $gdrlast = "refs/$gdrlast_refprefix/$'";
+    printdebug "ffq_prev_branchinfo branch current $symref\n";
+    return ('branch', undef, $symref, $ffq_prev, $gdrlast);
+}
+
 # ========== playground handling ==========
 
 # terminology:
diff --git a/git-debrebase b/git-debrebase
index e5cafd1c..fd676294 100755
--- a/git-debrebase
+++ b/git-debrebase
@@ -973,19 +973,8 @@ sub cmd_analyse () {
 }
 
 sub ffq_prev_branchinfo () {
-    # => ('status', "message", [$current, $ffq_prev, $gdrlast])
-    # 'status' may be
-    #    branch         message is undef
-    #    weird-symref   } no $current,
-    #    notbranch      }  no $ffq_prev
     my $current = git_get_symref();
-    return ('detached', 'detached HEAD') unless defined $current;
-    return ('weird-symref', 'HEAD symref is not to refs/')
-	unless $current =~ m{^refs/};
-    my $ffq_prev = "refs/$ffq_refprefix/$'";
-    my $gdrlast = "refs/$gdrlast_refprefix/$'";
-    printdebug "ffq_prev_branchinfo branch current $current\n";
-    return ('branch', undef, $current, $ffq_prev, $gdrlast);
+    return gdr_ffq_prev_branchinfo($current);
 }
 
 sub record_ffq_prev_deferred () {
-- 
2.30.2