[PATCH 2/3] build: check with lexgrog(1) if available

[Eric Wong <e@80x24.org>]

This will make life easier for Debian package maintainers
running lintian.

cf. commit 1350f5ab09f72c75ac2cd6c88f6a2b9e198fef55
    ("public-inbox-v[12]-format.pod: make lexgrog happy")
---
 .gitignore               | 1 +
 Documentation/include.mk | 3 +++
 Makefile.PL              | 8 +++++++-
 3 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/.gitignore b/.gitignore
index 7f4142ba..f7e4c595 100644
--- a/.gitignore
+++ b/.gitignore
@@ -16,6 +16,7 @@
 *.gz
 .*.cols
 .*.check
+.*.lexgrog
 /NEWS.html
 /NEWS.atom
 /NEWS
diff --git a/Documentation/include.mk b/Documentation/include.mk
index df6c17e0..79bf460d 100644
--- a/Documentation/include.mk
+++ b/Documentation/include.mk
@@ -6,6 +6,7 @@ RSYNC = rsync
 RSYNC_DEST = public-inbox.org:/srv/public-inbox/
 AWK = awk
 MAN = man
+LEXGROG = lexgrog
 
 # this is "xml" on FreeBSD and maybe some other distros:
 XMLSTARLET = xmlstarlet
@@ -56,6 +57,8 @@ check_man = $(AWK) '{gsub(/\b./,"")}length>80{print;err=1}END{exit(err)}'\
 
 check-man :: $(check_80)
 
+check-lexgrog :: $(check_lexgrog)
+
 all :: $(docs)
 
 txt2pre = $(PERL) -I lib ./Documentation/txt2pre >$@
diff --git a/Makefile.PL b/Makefile.PL
index 613a72ae..c57491eb 100644
--- a/Makefile.PL
+++ b/Makefile.PL
@@ -65,8 +65,12 @@ for my $i (@sections) {
 		$t->{".$m.cols : $m.$i"} = [
 			"\@echo CHECK80 $m.$i;".
 			"COLUMNS=80 \$(MAN) ./$m.$i | \$(check_man)" ];
+		$t->{".$m.lexgrog: $m.$i"} = [
+			"\@echo LEXGROG $m.$i;" .
+			"\$(LEXGROG) ./$m.$i >\$\@+ && mv \$\@+ \$@" ];
 	}
 	push @{$v->{check_80}}, map { ".$_.cols" } @$ary;
+	push @{$v->{check_lexgrog}}, map { ".$_.lexgrog" } @$ary;
 	my $manuals = $v->{"man$i"} = [ map { "$_.$i" } @$ary ];
 	push @{$v->{manuals}}, @$manuals;
 	push @{$v->{mantxt}}, map { "Documentation/$_.txt" } @$ary;
@@ -121,6 +125,8 @@ my %man3 = map {; # semi-colon tells Perl this is a BLOCK (and not EXPR)
 	"lib/PublicInbox/$_" => "blib/man3/PublicInbox::$mod.\$(MAN3EXT)"
 } qw(Git.pm Import.pm WWW.pod SaPlugin/ListMirror.pod);
 my $warn_no_pod = @no_pod ? "\n\t\@echo W: missing .pod: @no_pod\n" : '';
+chomp(my $lexgrog = `which lexgrog 2>/dev/null`);
+my $check_lexgrog = $lexgrog ? 'check-lexgrog' : '';
 
 WriteMakefile(
 	NAME => 'PublicInbox', # n.b. camel-case is not our choice
@@ -184,7 +190,7 @@ $VARS
 -include Documentation/include.mk
 $TGTS
 
-check-man ::$warn_no_pod
+check-man :: $check_lexgrog$warn_no_pod
 
 # syntax checks are currently GNU make only:
 %.syntax :: %