git-debrebase: merge: Actually record merge resolutions

[dgit.git] / git-debrebase

diff --git a/git-debrebase b/git-debrebase
index 0dea5d5e1f5f1945d969787818d25d7f302057ed..96966adb3bb07b1c81a90da3427057d7ecc6c6f9 100755 (executable)
--- a/git-debrebase
+++ b/git-debrebase
@@ -55,7 +55,8 @@ our ($opt_defaultcmd_interactive);
 
 our $us = qw(git-debrebase);
 
-our $wrecknoteprefix = 'refs/debrebase-wreckage';
+our $wrecknoteprefix = 'refs/debrebase/wreckage';
+our $merge_cache_ref = 'refs/debrebase/merge-resolutions';
 
 $|=1;
 
@@ -2204,19 +2205,32 @@ sub cmd_conclude () {
 sub cmd_scrap () {
     if (currently_rebasing()) {
        runcmd @git, qw(rebase --abort);
+       push @deferred_updates, 'verify HEAD HEAD';
+       # noop, but stops us complaining that scrap was a noop
     }
+    badusage "no arguments allowed" if @ARGV;
     my ($ffq_prev, $gdrlast, $ffq_prev_commitish) = ffq_prev_info();
-    if (!$ffq_prev_commitish) {
+    my $scrapping_head;
+    if ($ffq_prev_commitish) {
+       $scrapping_head = get_head();
+       push @deferred_updates,
+           "update $gdrlast $ffq_prev_commitish $git_null_obj",
+           "update $ffq_prev $git_null_obj $ffq_prev_commitish";
+    }
+    if (git_get_ref $merge_cache_ref) {
+       push @deferred_updates,
+           "delete $merge_cache_ref";
+    }
+    if (!@deferred_updates) {
        fail "No ongoing git-debrebase session." unless $opt_noop_ok;
        finish 0;
     }
-    my $scrapping_head = get_head();
-    badusage "no arguments allowed" if @ARGV;
-    push @deferred_updates,
-       "update $gdrlast $ffq_prev_commitish $git_null_obj",
-       "update $ffq_prev $git_null_obj $ffq_prev_commitish";
     snags_maybe_bail();
-    update_head_checkout $scrapping_head, $ffq_prev_commitish, "scrap";
+    if ($scrapping_head) {
+       update_head_checkout $scrapping_head, $ffq_prev_commitish, "scrap";
+    } else {
+       run_deferred_updates "scrap";
+    }
 }
 
 sub make_patches_staged ($) {
@@ -2611,6 +2625,46 @@ END
        'convert-from-dgit-view';
 }
 
+sub cmd_record_resolved_merge () {
+    badusage "record-resolved-merge takes no further arguments" if @ARGV;
+    # xxx needs documentation
+    my $new = get_head();
+    my $method;
+
+    print "Checking how you have resolved the merge problem\n";
+    my $nope = sub { print "Not $method: @_"; 0; };
+
+    my $maybe = sub { print "Seems to be $method.\n"; };
+    my $yes = sub {
+       my ($key, $ref) = @_;
+       reflog_cache_insert $merge_cache_ref, $key, $ref;
+       print "OK.  You can switch branches and try git-debrebase again.\n";
+       1;
+    };
+
+    fresh_workarea 'merge';
+    sub {
+       $method = 'vanilla-merge patchqueue';
+       my $vanilla = git_get_ref "$wrecknoteprefix/vanilla-merge";
+       $vanilla or return $nope->("wreckage was not of vanilla-merge");
+       foreach my $lr (qw(left right)) {
+           my $n = "$wrecknoteprefix/$lr-patchqueue";
+           my $lrpq = git_get_ref $n;
+           $lrpq or return $nope->("wreckage did not contain patchqueues");
+           is_fast_fwd $lrpq, $new or return $nope->("HEAD not ff of $n");
+       }
+       $maybe->();
+       my $newbase = git_get_ref "$wrecknoteprefix/new-base"
+           or die "wreckage element $wrecknoteprefix/new-base missing";
+       my $result = merge_series_patchqueue_convert
+           {}, $newbase, $new;
+       $yes->("vanilla-merge $vanilla", $result);
+       1;
+    }->() or sub {
+       fail "No resolved merge method seems applicable.\n";
+    }->();
+}
+
 sub cmd_downstream_rebase_launder_v0 () {
     badusage "needs 1 argument, the baseline" unless @ARGV==1;
     my ($base) = @ARGV;