lei inspect: support reading eml from --stdin

This can be useful inside mutt since I was diagnosing why
a label ("L:$FOO") search was giving me a false-positive
search result...

1 files changed, 35 insertions, 5 deletions

diff --git a/lib/PublicInbox/LeiInspect.pm b/lib/PublicInbox/LeiInspect.pm
index 2ade17af..25bd47e7 100644
--- a/lib/PublicInbox/LeiInspect.pm
+++ b/lib/PublicInbox/LeiInspect.pm
@@ -9,6 +9,7 @@ package PublicInbox::LeiInspect;
 use strict;
 use v5.10.1;
 use PublicInbox::Config;
+use PublicInbox::MID qw(mids);
 
 sub inspect_blob ($$) {
         my ($lei, $oidhex) = @_;
@@ -184,6 +185,32 @@ sub inspect1 ($$$) {
         1;
 }
 
+sub _inspect_argv ($$) {
+        my ($lei, $argv) = @_;
+        my $multi = scalar(@$argv) > 1;
+        $lei->out('[') if $multi;
+        while (defined(my $x = shift @$argv)) {
+                inspect1($lei, $x, scalar(@$argv)) or return;
+        }
+        $lei->out(']') if $multi;
+}
+
+sub ins_add { # InputPipe->consume callback
+        my ($lei) = @_; # $_[1] = $rbuf
+        if (defined $_[1]) {
+                $_[1] eq '' and return eval {
+                        my $str = delete $lei->{istr};
+                        $str =~ s/\A[\r\n]*From [^\r\n]*\r?\n//s;
+                        my $eml = PublicInbox::Eml->new(\$str);
+                        _inspect_argv($lei, [ 'blob:'.$lei->git_blob_id($eml),
+                                map { "mid:$_" } @{mids($eml)} ]);
+                };
+                $lei->{istr} .= $_[1];
+        } else {
+                $lei->fail("error reading stdin: $!");
+        }
+}
+
 sub lei_inspect {
         my ($lei, @argv) = @_;
         $lei->{json} = ref(PublicInbox::Config::json())->new->utf8->canonical;
@@ -196,12 +223,15 @@ sub lei_inspect {
         }
         $lei->start_pager if -t $lei->{1};
         $lei->{1}->autoflush(0);
-        my $multi = scalar(@argv) > 1;
-        $lei->out('[') if $multi;
-        while (defined(my $x = shift @argv)) {
-                inspect1($lei, $x, scalar(@argv)) or return;
+        if ($lei->{opt}->{stdin}) {
+                return $lei->fail(<<'') if @argv;
+no args allowed on command-line with --stdin
+
+                require PublicInbox::InputPipe;
+                PublicInbox::InputPipe::consume($lei->{0}, \&ins_add, $lei);
+                return;
         }
-        $lei->out(']') if $multi;
+        _inspect_argv($lei, \@argv);
 }
 
 sub _complete_inspect {