ci: validate "linkgit:" in documentation
It is easy to add incorrect "linkgit:<page>[<section>]" references
to our documentation suite. Catch these common classes of errors:
* Referring to Documentation/<page>.txt that does not exist.
* Referring to a <page> outside the Git suite. In general, <page>
must begin with "git".
* Listing the manual <section> incorrectly. The first line of the
Documentation/<page>.txt must end with "(<section>)".
with a new script "ci/lint-gitlink", and drive it from "make check-docs".
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/Documentation/lint-gitlink.perl b/Documentation/lint-gitlink.perl
new file mode 100755
index 0000000..476cc30
--- /dev/null
+++ b/Documentation/lint-gitlink.perl
@@ -0,0 +1,71 @@
+#!/usr/bin/perl
+
+use File::Find;
+use Getopt::Long;
+
+my $basedir = ".";
+GetOptions("basedir=s" => \$basedir)
+ or die("Cannot parse command line arguments\n");
+
+my $found_errors = 0;
+
+sub report {
+ my ($where, $what, $error) = @_;
+ print "$where: $error: $what\n";
+ $found_errors = 1;
+}
+
+sub grab_section {
+ my ($page) = @_;
+ open my $fh, "<", "$basedir/$page.txt";
+ my $firstline = <$fh>;
+ chomp $firstline;
+ close $fh;
+ my ($section) = ($firstline =~ /.*\((\d)\)$/);
+ return $section;
+}
+
+sub lint {
+ my ($file) = @_;
+ open my $fh, "<", $file
+ or return;
+ while (<$fh>) {
+ my $where = "$file:$.";
+ while (s/linkgit:((.*?)\[(\d)\])//) {
+ my ($target, $page, $section) = ($1, $2, $3);
+
+ # De-AsciiDoc
+ $page =~ s/{litdd}/--/g;
+
+ if ($page !~ /^git/) {
+ report($where, $target, "nongit link");
+ next;
+ }
+ if (! -f "$basedir/$page.txt") {
+ report($where, $target, "no such source");
+ next;
+ }
+ $real_section = grab_section($page);
+ if ($real_section != $section) {
+ report($where, $target,
+ "wrong section (should be $real_section)");
+ next;
+ }
+ }
+ }
+ close $fh;
+}
+
+sub lint_it {
+ lint($File::Find::name) if -f && /\.txt$/;
+}
+
+if (!@ARGV) {
+ find({ wanted => \&lint_it, no_chdir => 1 }, $basedir);
+} else {
+ for (@ARGV) {
+ lint($_);
+ }
+}
+
+exit $found_errors;
