1#!/usr/bin/env perl
2# SPDX-License-Identifier: GPL-2.0
3
4use strict;
5use Pod::Usage;
6use Getopt::Long;
7use File::Find;
8use Fcntl ':mode';
9use Cwd 'abs_path';
10
11my $help;
12my $man;
13my $debug;
14my $arch;
15my $feat;
16my $enable_fname;
17
18my $basename = abs_path($0);
19$basename =~ s,/[^/]+$,/,;
20
21my $prefix=$basename . "../Documentation/features";
22
23# Used only at for full features output. The script will auto-adjust
24# such values for the minimal possible values
25my $status_size = 1;
26my $description_size = 1;
27
28GetOptions(
29	"debug|d+" => \$debug,
30	"dir=s" => \$prefix,
31	'help|?' => \$help,
32	'arch=s' => \$arch,
33	'feat=s' => \$feat,
34	'feature=s' => \$feat,
35	"enable-fname" => \$enable_fname,
36	man => \$man
37) or pod2usage(2);
38
39pod2usage(1) if $help;
40pod2usage(-exitstatus => 0, -verbose => 2) if $man;
41
42pod2usage(1) if (scalar @ARGV < 1 || @ARGV > 2);
43
44my ($cmd, $arg) = @ARGV;
45
46pod2usage(2) if ($cmd ne "current" && $cmd ne "rest" && $cmd ne "validate"
47		&& $cmd ne "ls" && $cmd ne "list");
48
49require Data::Dumper if ($debug);
50
51my %data;
52my %archs;
53
54#
55# Displays an error message, printing file name and line
56#
57sub parse_error($$$$) {
58	my ($file, $ln, $msg, $data) = @_;
59
60	$data =~ s/\s+$/\n/;
61
62	print STDERR "Warning: file $file#$ln:\n\t$msg";
63
64	if ($data ne "") {
65		print STDERR ". Line\n\t\t$data";
66	} else {
67	    print STDERR "\n";
68	}
69}
70
71#
72# Parse a features file, storing its contents at %data
73#
74
75my $h_name = "Feature";
76my $h_kconfig = "Kconfig";
77my $h_description = "Description";
78my $h_subsys = "Subsystem";
79my $h_status = "Status";
80my $h_arch = "Architecture";
81
82my $max_size_name = length($h_name);
83my $max_size_kconfig = length($h_kconfig);
84my $max_size_description = length($h_description);
85my $max_size_subsys = length($h_subsys);
86my $max_size_status = length($h_status);
87
88my $max_size_arch = 0;
89my $max_size_arch_with_header;
90my $max_description_word = 0;
91
92sub parse_feat {
93	my $file = $File::Find::name;
94
95	my $mode = (stat($file))[2];
96	return if ($mode & S_IFDIR);
97	return if ($file =~ m,($prefix)/arch-support.txt,);
98	return if (!($file =~ m,arch-support.txt$,));
99
100	if ($enable_fname) {
101		printf ".. FILE %s\n", abs_path($file);
102	}
103
104	my $subsys = "";
105	$subsys = $2 if ( m,.*($prefix)/([^/]+).*,);
106
107	if (length($subsys) > $max_size_subsys) {
108		$max_size_subsys = length($subsys);
109	}
110
111	my $name;
112	my $kconfig;
113	my $description;
114	my $comments = "";
115	my $last_status;
116	my $ln;
117	my %arch_table;
118
119	print STDERR "Opening $file\n" if ($debug > 1);
120	open IN, $file;
121
122	while(<IN>) {
123		$ln++;
124
125		if (m/^\#\s+Feature\s+name:\s*(.*\S)/) {
126			$name = $1;
127			if (length($name) > $max_size_name) {
128				$max_size_name = length($name);
129			}
130			next;
131		}
132		if (m/^\#\s+Kconfig:\s*(.*\S)/) {
133			$kconfig = $1;
134			if (length($kconfig) > $max_size_kconfig) {
135				$max_size_kconfig = length($kconfig);
136			}
137			next;
138		}
139		if (m/^\#\s+description:\s*(.*\S)/) {
140			$description = $1;
141			if (length($description) > $max_size_description) {
142				$max_size_description = length($description);
143			}
144
145			foreach my $word (split /\s+/, $description) {
146				if (length($word) > $max_description_word) {
147					$max_description_word = length($word);
148				}
149			}
150
151			next;
152		}
153		next if (m/^\\s*$/);
154		next if (m/^\s*\-+\s*$/);
155		next if (m/^\s*\|\s*arch\s*\|\s*status\s*\|\s*$/);
156
157		if (m/^\#\s*(.*)/) {
158			$comments .= "$1\n";
159			next;
160		}
161		if (m/^\s*\|\s*(\S+):\s*\|\s*(\S+)\s*\|\s*$/) {
162			my $a = $1;
163			my $status = $2;
164
165			if (length($status) > $max_size_status) {
166				$max_size_status = length($status);
167			}
168			if (length($a) > $max_size_arch) {
169				$max_size_arch = length($a);
170			}
171
172			$status = "---" if ($status =~ m/^\.\.$/);
173
174			$archs{$a} = 1;
175			$arch_table{$a} = $status;
176			next;
177		}
178
179		#Everything else is an error
180		parse_error($file, $ln, "line is invalid", $_);
181	}
182	close IN;
183
184	if (!$name) {
185		parse_error($file, $ln, "Feature name not found", "");
186		return;
187	}
188
189	parse_error($file, $ln, "Subsystem not found", "") if (!$subsys);
190	parse_error($file, $ln, "Kconfig not found", "") if (!$kconfig);
191	parse_error($file, $ln, "Description not found", "") if (!$description);
192
193	if (!%arch_table) {
194		parse_error($file, $ln, "Architecture table not found", "");
195		return;
196	}
197
198	$data{$name}->{where} = $file;
199	$data{$name}->{subsys} = $subsys;
200	$data{$name}->{kconfig} = $kconfig;
201	$data{$name}->{description} = $description;
202	$data{$name}->{comments} = $comments;
203	$data{$name}->{table} = \%arch_table;
204
205	$max_size_arch_with_header = $max_size_arch + length($h_arch);
206}
207
208#
209# Output feature(s) for a given architecture
210#
211sub output_arch_table {
212	my $title = "Feature status on $arch architecture";
213
214	print "=" x length($title) . "\n";
215	print "$title\n";
216	print "=" x length($title) . "\n\n";
217
218	print "=" x $max_size_subsys;
219	print "  ";
220	print "=" x $max_size_name;
221	print "  ";
222	print "=" x $max_size_kconfig;
223	print "  ";
224	print "=" x $max_size_status;
225	print "  ";
226	print "=" x $max_size_description;
227	print "\n";
228	printf "%-${max_size_subsys}s  ", $h_subsys;
229	printf "%-${max_size_name}s  ", $h_name;
230	printf "%-${max_size_kconfig}s  ", $h_kconfig;
231	printf "%-${max_size_status}s  ", $h_status;
232	printf "%-${max_size_description}s\n", $h_description;
233	print "=" x $max_size_subsys;
234	print "  ";
235	print "=" x $max_size_name;
236	print "  ";
237	print "=" x $max_size_kconfig;
238	print "  ";
239	print "=" x $max_size_status;
240	print "  ";
241	print "=" x $max_size_description;
242	print "\n";
243
244	foreach my $name (sort {
245				($data{$a}->{subsys} cmp $data{$b}->{subsys}) ||
246				("\L$a" cmp "\L$b")
247			       } keys %data) {
248		next if ($feat && $name ne $feat);
249
250		my %arch_table = %{$data{$name}->{table}};
251		printf "%-${max_size_subsys}s  ", $data{$name}->{subsys};
252		printf "%-${max_size_name}s  ", $name;
253		printf "%-${max_size_kconfig}s  ", $data{$name}->{kconfig};
254		printf "%-${max_size_status}s  ", $arch_table{$arch};
255		printf "%-s\n", $data{$name}->{description};
256	}
257
258	print "=" x $max_size_subsys;
259	print "  ";
260	print "=" x $max_size_name;
261	print "  ";
262	print "=" x $max_size_kconfig;
263	print "  ";
264	print "=" x $max_size_status;
265	print "  ";
266	print "=" x $max_size_description;
267	print "\n";
268}
269
270#
271# list feature(s) for a given architecture
272#
273sub list_arch_features {
274	print "#\n# Kernel feature support matrix of the '$arch' architecture:\n#\n";
275
276	foreach my $name (sort {
277				($data{$a}->{subsys} cmp $data{$b}->{subsys}) ||
278				("\L$a" cmp "\L$b")
279			       } keys %data) {
280		next if ($feat && $name ne $feat);
281
282		my %arch_table = %{$data{$name}->{table}};
283
284		my $status = $arch_table{$arch};
285		$status = " " x ((4 - length($status)) / 2) . $status;
286
287		printf " %${max_size_subsys}s/ ", $data{$name}->{subsys};
288		printf "%-${max_size_name}s: ", $name;
289		printf "%-5s|   ", $status;
290		printf "%${max_size_kconfig}s # ", $data{$name}->{kconfig};
291		printf " %s\n", $data{$name}->{description};
292	}
293}
294
295#
296# Output a feature on all architectures
297#
298sub output_feature {
299	my $title = "Feature $feat";
300
301	print "=" x length($title) . "\n";
302	print "$title\n";
303	print "=" x length($title) . "\n\n";
304
305	print ":Subsystem: $data{$feat}->{subsys} \n" if ($data{$feat}->{subsys});
306	print ":Kconfig: $data{$feat}->{kconfig} \n" if ($data{$feat}->{kconfig});
307
308	my $desc = $data{$feat}->{description};
309	$desc =~ s/^([a-z])/\U$1/;
310	$desc =~ s/\.?\s*//;
311	print "\n$desc.\n\n";
312
313	my $com = $data{$feat}->{comments};
314	$com =~ s/^\s+//;
315	$com =~ s/\s+$//;
316	if ($com) {
317		print "Comments\n";
318		print "--------\n\n";
319		print "$com\n\n";
320	}
321
322	print "=" x $max_size_arch_with_header;
323	print "  ";
324	print "=" x $max_size_status;
325	print "\n";
326
327	printf "%-${max_size_arch}s  ", $h_arch;
328	printf "%-${max_size_status}s", $h_status . "\n";
329
330	print "=" x $max_size_arch_with_header;
331	print "  ";
332	print "=" x $max_size_status;
333	print "\n";
334
335	my %arch_table = %{$data{$feat}->{table}};
336	foreach my $arch (sort keys %arch_table) {
337		printf "%-${max_size_arch}s  ", $arch;
338		printf "%-${max_size_status}s\n", $arch_table{$arch};
339	}
340
341	print "=" x $max_size_arch_with_header;
342	print "  ";
343	print "=" x $max_size_status;
344	print "\n";
345}
346
347#
348# Output all features for all architectures
349#
350
351sub matrix_lines($$$) {
352	my $desc_size = shift;
353	my $status_size = shift;
354	my $header = shift;
355	my $fill;
356	my $ln_marker;
357
358	if ($header) {
359		$ln_marker = "=";
360	} else {
361		$ln_marker = "-";
362	}
363
364	$fill = $ln_marker;
365
366	print "+";
367	print $fill x $max_size_name;
368	print "+";
369	print $fill x $desc_size;
370	print "+";
371	print $ln_marker x $status_size;
372	print "+\n";
373}
374
375sub output_matrix {
376	my $title = "Feature status on all architectures";
377	my $notcompat = "Not compatible";
378
379	print "=" x length($title) . "\n";
380	print "$title\n";
381	print "=" x length($title) . "\n\n";
382
383	my $desc_title = "$h_kconfig / $h_description";
384
385	my $desc_size = $max_size_kconfig + 4;
386	if (!$description_size) {
387		$desc_size = $max_size_description if ($max_size_description > $desc_size);
388	} else {
389		$desc_size = $description_size if ($description_size > $desc_size);
390	}
391	$desc_size = $max_description_word if ($max_description_word > $desc_size);
392
393	$desc_size = length($desc_title) if (length($desc_title) > $desc_size);
394
395	$max_size_status = length($notcompat) if (length($notcompat) > $max_size_status);
396
397	# Ensure that the status will fit
398	my $min_status_size = $max_size_status + $max_size_arch + 6;
399	$status_size = $min_status_size if ($status_size < $min_status_size);
400
401
402	my $cur_subsys = "";
403	foreach my $name (sort {
404				($data{$a}->{subsys} cmp $data{$b}->{subsys}) or
405				("\L$a" cmp "\L$b")
406			       } keys %data) {
407
408		if ($cur_subsys ne $data{$name}->{subsys}) {
409			if ($cur_subsys ne "") {
410				printf "\n";
411			}
412
413			$cur_subsys = $data{$name}->{subsys};
414
415			my $title = "Subsystem: $cur_subsys";
416			print "$title\n";
417			print "=" x length($title) . "\n\n";
418
419
420			matrix_lines($desc_size, $status_size, 0);
421
422			printf "|%-${max_size_name}s", $h_name;
423			printf "|%-${desc_size}s", $desc_title;
424
425			printf "|%-${status_size}s|\n", "Status per architecture";
426			matrix_lines($desc_size, $status_size, 1);
427		}
428
429		my %arch_table = %{$data{$name}->{table}};
430		my $cur_status = "";
431
432		my (@lines, @descs);
433		my $line = "";
434		foreach my $arch (sort {
435					($arch_table{$b} cmp $arch_table{$a}) or
436					("\L$a" cmp "\L$b")
437				       } keys %arch_table) {
438
439			my $status = $arch_table{$arch};
440
441			if ($status eq "---") {
442				$status = $notcompat;
443			}
444
445			if ($status ne $cur_status) {
446				if ($line ne "") {
447					push @lines, $line;
448					$line = "";
449				}
450				$line = "- **" . $status . "**: " . $arch;
451			} elsif (length($line) + length ($arch) + 2 < $status_size) {
452				$line .= ", " . $arch;
453			} else {
454				push @lines, $line;
455				$line = "  " . $arch;
456			}
457			$cur_status = $status;
458		}
459		push @lines, $line if ($line ne "");
460
461		my $description = $data{$name}->{description};
462		while (length($description) > $desc_size) {
463			my $d = substr $description, 0, $desc_size;
464
465			# Ensure that it will end on a space
466			# if it can't, it means that the size is too small
467			# Instead of aborting it, let's print what we have
468			if (!($d =~ s/^(.*)\s+.*/$1/)) {
469				$d = substr $d, 0, -1;
470				push @descs, "$d\\";
471				$description =~ s/^\Q$d\E//;
472			} else {
473				push @descs, $d;
474				$description =~ s/^\Q$d\E\s+//;
475			}
476		}
477		push @descs, $description;
478
479		# Ensure that the full description will be printed
480		push @lines, "" while (scalar(@lines) < 2 + scalar(@descs));
481
482		my $ln = 0;
483		for my $line(@lines) {
484			if (!$ln) {
485				printf "|%-${max_size_name}s", $name;
486				printf "|%-${desc_size}s", "``" . $data{$name}->{kconfig} . "``";
487			} elsif ($ln >= 2 && scalar(@descs)) {
488				printf "|%-${max_size_name}s", "";
489				printf "|%-${desc_size}s", shift @descs;
490			} else {
491				printf "|%-${max_size_name}s", "";
492				printf "|%-${desc_size}s", "";
493			}
494
495			printf "|%-${status_size}s|\n", $line;
496
497			$ln++;
498		}
499		matrix_lines($desc_size, $status_size, 0);
500	}
501}
502
503
504#
505# Parses all feature files located at $prefix dir
506#
507find({wanted =>\&parse_feat, no_chdir => 1}, $prefix);
508
509print STDERR Data::Dumper->Dump([\%data], [qw(*data)]) if ($debug);
510
511#
512# Handles the command
513#
514if ($cmd eq "current") {
515	$arch = qx(uname -m | sed 's/x86_64/x86/' | sed 's/i386/x86/');
516	$arch =~s/\s+$//;
517}
518
519if ($cmd eq "ls" or $cmd eq "list") {
520	if (!$arch) {
521		$arch = qx(uname -m | sed 's/x86_64/x86/' | sed 's/i386/x86/');
522		$arch =~s/\s+$//;
523	}
524
525	list_arch_features;
526
527	exit;
528}
529
530if ($cmd ne "validate") {
531	if ($arch) {
532		output_arch_table;
533	} elsif ($feat) {
534		output_feature;
535	} else {
536		output_matrix;
537	}
538}
539
540__END__
541
542=head1 NAME
543
544get_feat.pl - parse the Linux Feature files and produce a ReST book.
545
546=head1 SYNOPSIS
547
548B<get_feat.pl> [--debug] [--man] [--help] [--dir=<dir>] [--arch=<arch>]
549	       [--feature=<feature>|--feat=<feature>] <COMAND> [<ARGUMENT>]
550
551Where <COMMAND> can be:
552
553=over 8
554
555B<current>               - output table in ReST compatible ASCII format
556			   with features for this machine's architecture
557
558B<rest>                  - output table(s)  in ReST compatible ASCII format
559			   with features in ReST markup language. The output
560			   is affected by --arch or --feat/--feature flags.
561
562B<validate>              - validate the contents of the files under
563			   Documentation/features.
564
565B<ls> or B<list>         - list features for this machine's architecture,
566			   using an easier to parse format.
567			   The output is affected by --arch flag.
568
569=back
570
571=head1 OPTIONS
572
573=over 8
574
575=item B<--arch>
576
577Output features for an specific architecture, optionally filtering for
578a single specific feature.
579
580=item B<--feat> or B<--feature>
581
582Output features for a single specific feature.
583
584=item B<--dir>
585
586Changes the location of the Feature files. By default, it uses
587the Documentation/features directory.
588
589=item B<--enable-fname>
590
591Prints the file name of the feature files. This can be used in order to
592track dependencies during documentation build.
593
594=item B<--debug>
595
596Put the script in verbose mode, useful for debugging. Can be called multiple
597times, to increase verbosity.
598
599=item B<--help>
600
601Prints a brief help message and exits.
602
603=item B<--man>
604
605Prints the manual page and exits.
606
607=back
608
609=head1 DESCRIPTION
610
611Parse the Linux feature files from Documentation/features (by default),
612optionally producing results at ReST format.
613
614It supports output data per architecture, per feature or a
615feature x arch matrix.
616
617When used with B<rest> command, it will use either one of the tree formats:
618
619If neither B<--arch> or B<--feature> arguments are used, it will output a
620matrix with features per architecture.
621
622If B<--arch> argument is used, it will output the features availability for
623a given architecture.
624
625If B<--feat> argument is used, it will output the content of the feature
626file using ReStructured Text markup.
627
628=head1 BUGS
629
630Report bugs to Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
631
632=head1 COPYRIGHT
633
634Copyright (c) 2019 by Mauro Carvalho Chehab <mchehab+samsung@kernel.org>.
635
636License GPLv2: GNU GPL version 2 <http://gnu.org/licenses/gpl.html>.
637
638This is free software: you are free to change and redistribute it.
639There is NO WARRANTY, to the extent permitted by law.
640
641=cut
642