[PATCH] lei_input: provide hint for bare "L:" and "kw:"

[Eric Wong]

I just made this mistake running "lei import" myself, so
I figure giving a hint makes sense, here.
---
 lib/PublicInbox/LeiInput.pm | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/lib/PublicInbox/LeiInput.pm b/lib/PublicInbox/LeiInput.pm
index cb71e97c..8ce445c8 100644
--- a/lib/PublicInbox/LeiInput.pm
+++ b/lib/PublicInbox/LeiInput.pm
@@ -276,7 +276,10 @@ sub prepare_inputs { # returns undef on error
                                $may_sync and $input = 'maildir:'.
                                                $lei->abs_path($input_path);
                        } else {
-                               return $lei->fail("Unable to handle $input");
+                               my $m = "Unable to handle $input";
+                               $input =~ /\A(?:L|kw):/ and
+                                       $m .= ", did you mean +$input?";
+                               return $lei->fail($m);
                        }
                } elsif ($input =~ /\.(?:eml|patch)\z/i && -f $input) {
                        lc($in_fmt//'eml') eq 'eml' or return $lei->fail(<<"");
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