scripts/get_abi.pl: avoid use literal blocks when not needed

The usage of literal blocks make the document very complex,
causing the browser to take a long time to load.

On most ABI descriptions, they're a plain text, and don't
require a literal block.

So, add a logic there with identifies when a literal block
is needed.

As, on literal blocks, we need to respect the original
document space, the most complex part of this patch is
to preserve the original spacing where needed.

Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

scripts/get_abi.pl

@@ -59,29 +59,34 @@ sub parse_abi {
 	my $ln;
 	my $has_file;
 	my $xrefs;
+	my $space;
 
 	print STDERR "Opening $file\n" if ($debug > 1);
 	open IN, $file;
 	while(<IN>) {
 		$ln++;
-		if (m/^(\S+):\s*(.*)/i) {
+		if (m/^(\S+)(:\s*)(.*)/i) {
 			my $new_tag = lc($1);
-			my $content = $2;
+			my $sep = $2;
+			my $content = $3;
 
 			if (!($new_tag =~ m/(what|date|kernelversion|contact|description|users)/)) {
 				if ($tag eq "description") {
-					$data{$what}->{$tag} .= "\n$content";
-					$data{$what}->{$tag} =~ s/\n+$//;
-					next;
+					# New "tag" is actually part of
+					# description. Don't consider it a tag
+					$new_tag = "";
 				} else {
 					parse_error($file, $ln, "tag '$tag' is invalid", $_);
 				}
 			}
 
 			if ($new_tag =~ m/what/) {
+				$space = "";
 				if ($tag =~ m/what/) {
 					$what .= ", " . $content;
 				} else {
+					parse_error($file, $ln, "What '$what' doesn't have a description", "") if ($what && !$data{$what}->{description});
+
 					$what = $content;
 					$new_what = 1;
 				}
@@ -108,25 +113,38 @@ sub parse_abi {
 				next;
 			}
 
-			$tag = $new_tag;
+			if ($new_tag) {
+				$tag = $new_tag;
 
-			if ($new_what) {
-				$new_what = 0;
+				if ($new_what) {
+					$new_what = 0;
 
-				$data{$what}->{type} = $type;
-				$data{$what}->{file} = $name;
-				print STDERR "\twhat: $what\n" if ($debug > 1);
-			}
+					$data{$what}->{type} = $type;
+					$data{$what}->{file} = $name;
+					print STDERR "\twhat: $what\n" if ($debug > 1);
+				}
 
-			if (!$what) {
-				parse_error($file, $ln, "'What:' should come first:", $_);
+				if (!$what) {
+					parse_error($file, $ln, "'What:' should come first:", $_);
+					next;
+				}
+				if ($tag eq "description") {
+					next if ($content =~ m/^\s*$/);
+					if ($content =~ m/^(\s*)(.*)/) {
+						my $new_content = $2;
+						$space = $new_tag . $sep . $1;
+						while ($space =~ s/\t+/' ' x (length($&) * 8 - length($`) % 8)/e) {}
+						$space =~ s/./ /g;
+						$data{$what}->{$tag} .= "$new_content\n";
+					}
+				} else {
+					$data{$what}->{$tag} = $content;
+				}
 				next;
 			}
-			$data{$what}->{$tag} = $content;
-			next;
 		}
 
-		# Store any contents before the database
+		# Store any contents before tags at the database
 		if (!$tag) {
 			next if (/^\n/);
 
@@ -139,6 +157,32 @@ sub parse_abi {
 			next;
 		}
 
+		if ($tag eq "description") {
+			if (!$data{$what}->{description}) {
+				next if (m/^\s*\n/);
+				if (m/^(\s*)(.*)/) {
+					$space = $1;
+					while ($space =~ s/\t+/' ' x (length($&) * 8 - length($`) % 8)/e) {}
+					$data{$what}->{$tag} .= "$2\n";
+				}
+			} else {
+				my $content = $_;
+				if (m/^\s*\n/) {
+					$data{$what}->{$tag} .= $content;
+					next;
+				}
+
+				while ($content =~ s/\t+/' ' x (length($&) * 8 - length($`) % 8)/e) {}
+				$space = "" if (!($content =~ s/^($space)//));
+
+				# Compress spaces with tabs
+				$content =~ s<^ {8}> <\t>;
+				$content =~ s<^ {1,7}\t> <\t>;
+				$content =~ s< {1,7}\t> <\t>;
+				$data{$what}->{$tag} .= $content;
+			}
+			next;
+		}
 		if (m/^\s*(.*)/) {
 			$data{$what}->{$tag} .= "\n$1";
 			$data{$what}->{$tag} =~ s/\n+$//;
@@ -165,6 +209,9 @@ sub output_rest {
 		my $w = $what;
 		$w =~ s/([\(\)\_\-\*\=\^\~\\])/\\$1/g;
 
+		my $bar = $w;
+		$bar =~ s/./-/g;
+
 		if ($data{$what}->{label}) {
 			my @labels = split(/\s/, $data{$what}->{label});
 			foreach my $label (@labels) {
@@ -172,10 +219,9 @@ sub output_rest {
 			}
 		}
 
-		print "$w\n\n";
+		print "$w\n$bar\n\n";
 
 		print "- defined on file $file (type: $type)\n\n" if ($type ne "File");
-		print "::\n\n";
 
 		my $desc = $data{$what}->{description};
 		$desc =~ s/^\s+//;
@@ -183,18 +229,24 @@ sub output_rest {
 		# Remove title markups from the description, as they won't work
 		$desc =~ s/\n[\-\*\=\^\~]+\n/\n/g;
 
-		# put everything inside a code block
-		$desc =~ s/\n/\n /g;
-
-
 		if (!($desc =~ /^\s*$/)) {
-			print " $desc\n\n";
+			if ($desc =~ m/\:\n/ || $desc =~ m/\n[\t ]+/  || $desc =~ m/[\x00-\x08\x0b-\x1f\x7b-\xff]/) {
+				# put everything inside a code block
+				$desc =~ s/\n/\n /g;
+
+				print "::\n\n";
+				print " $desc\n\n";
+			} else {
+				# Escape any special chars from description
+				$desc =~s/([\x00-\x08\x0b-\x1f\x21-\x2a\x2d\x2f\x3c-\x40\x5c\x5e-\x60\x7b-\xff])/\\$1/g;
+
+				print "$desc\n\n";
+			}
 		} else {
-			print " DESCRIPTION MISSING for $what\n\n";
+			print "DESCRIPTION MISSING for $what\n\n";
 		}
 
 		printf "Has the following ABI:\n\n%s", $data{$what}->{xrefs} if ($data{$what}->{xrefs});
-
 	}
 }