doc: test linkgit macros for well-formedness

Some readers of man pages have reported that they found
malformed linkgit macros in the documentation (absence or bad
spelling).

Signed-off-by: Jean-Noël Avila <jn.avila@free.fr>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: jnavila

Documentation/gitweb.conf.adoc

@@ -178,7 +178,7 @@ $export_ok::
 	Show repository only if this file exists (in repository).  Only
 	effective if this variable evaluates to true.  Can be set when
 	building gitweb by setting `GITWEB_EXPORT_OK`.  This path is
-	relative to `GIT_DIR`.  git-daemon[1] uses 'git-daemon-export-ok',
+	relative to `GIT_DIR`.  linkgit:git-daemon[1] uses 'git-daemon-export-ok',
 	unless started with `--export-all`.  By default this variable is
 	not set, which means that this feature is turned off.
 

Documentation/lint-gitlink.perl

@@ -41,6 +41,13 @@ sub report {
 @ARGV = $to_check;
 while (<>) {
 	my $line = $_;
+	while ($line =~ m/(.{,8})((git[-a-z]+|scalar)\[(\d)*\])/g) {
+	    my $pos = pos $line;
+	    my ($macro, $target, $page, $section) = ($1, $2, $3, $4);
+		if ( $macro ne "linkgit:" && $macro !~ "ifn?def::" && $macro ne "endif::" ) {
+			report($pos, $line, $target, "linkgit: macro expected");
+		}
+	}
 	while ($line =~ m/linkgit:((.*?)\[(\d)\])/g) {
 		my $pos = pos $line;
 		my ($target, $page, $section) = ($1, $2, $3);