Add debug help for hanging OSX

Author: mawww

test/tools/git/blame-in-diff/rc

@@ -8,11 +8,15 @@ define-command run %{
         git add
         git commit --message 'initial commit'
         execute-keys %{2gIchanged <esc>}
+        echo -end-of-line -to-file /dev/stderr "writing"
         write
         git commit --all --message 'changed line 2'
+        echo -end-of-line -to-file /dev/stderr "commit done"
         # Show the commit, jumping to the new version of line 2.
         git blame-jump
+        echo -end-of-line -to-file /dev/stderr "blame done"
         hook -once buffer BufCloseFifo .* %{
+            echo -end-of-line -to-file /dev/stderr "buf close fifo"
             evaluate-commands -client client0 %{
                 # We've jumped to the new version of line 2. Move to the old
                 # version so we can annotate the old version of the file.

test/tools/git/blame-in-diff/script

@@ -1,3 +1,5 @@
 mkfifo fifo 2>/dev/null
+echo waiting for fifo
 cat fifo
+echo fifo waiting done
 # We should have jumped to the old version of line 2, assert on kak_selection.