scripts: get_abi.pl: auto-generate cross references

There are several cross-references that can be automatically
generated:

	- References to .rst files inside Documentation/
	- References to other ABI files;
	- References to ABI symbols at /sys/*.

Add a logic to automatically parse them and convert into
cross references.

Acked-by: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/abe756d4f94fb6ffcc3dd3902a766c7c3990ea89.1604042072.git.mchehab+huawei@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/scripts/get_abi.pl b/scripts/get_abi.pl
index 12a23f9..ff4f9f8 100755 (executable)
--- a/scripts/get_abi.pl
+++ b/scripts/get_abi.pl
@@ -3,6 +3,7 @@
 
 use strict;
 use warnings;
+use utf8;
 use Pod::Usage;
 use Getopt::Long;
 use File::Find;
@@ -272,6 +273,9 @@ sub create_labels {
 # Outputs the book on ReST format
 #
 
+# \b doesn't work well with paths. So, we need to define something else
+my $bondary = qr { (?<![\w\/\`\{])(?=[\w\/\`\{])|(?<=[\w\/\`\{])(?![\w\/\`\{]) }x;
+
 sub output_rest {
        create_labels();
 
@@ -342,6 +346,33 @@ sub output_rest {
 
                if (!($desc =~ /^\s*$/)) {
                        if ($description_is_rst) {
+                               # Enrich text by creating cross-references
+
+                               $desc =~ s,Documentation/(?!devicetree)(\S+)\.rst,:doc:`/$1`,g;
+
+                               my @matches = $desc =~ m,Documentation/ABI/([\w\/\-]+),;
+                               foreach my $f (@matches) {
+                                       my $xref = $f;
+                                       my $path = $f;
+                                       $path =~ s,.*/(.*/.*),$1,;;
+                                       $path =~ s,[/\-],_,g;;
+                                       $xref .= " <abi_file_" . $path . ">";
+                                       $desc =~ s,\bDocumentation/ABI/$f\b,:ref:`$xref`,g;
+                               }
+
+                               @matches = $desc =~ m,$bondary(/sys/[^\s\.\,\;\:\*\s\`\'\(\)]+)$bondary,;
+
+                               foreach my $s (@matches) {
+                                       if (defined($data{$s}) && defined($data{$s}->{label})) {
+                                               my $xref = $s;
+
+                                               $xref =~ s/([\x00-\x1f\x21-\x2f\x3a-\x40\x7b-\xff])/\\$1/g;
+                                               $xref = ":ref:`$xref <" . $data{$s}->{label} . ">`";
+
+                                               $desc =~ s,$bondary$s$bondary,$xref,g;
+                                       }
+                               }
+
                                print "$desc\n\n";
                        } else {
                                $desc =~ s/^\s+//;