scripts/get_feat.pl

   1 #!/usr/bin/perl
   2 # SPDX-License-Identifier: GPL-2.0
   3
   4 use strict;
   5 use Pod::Usage;
   6 use Getopt::Long;
   7 use File::Find;
   8 use Fcntl ':mode';
   9 use Cwd 'abs_path';
  10
  11 my $help;
  12 my $man;
  13 my $debug;
  14 my $arch;
  15 my $feat;
  16 my $enable_fname;
  17
  18 my $basename = abs_path($0);
  19 $basename =~ s,/[^/]+$,/,;
  20
  21 my $prefix=$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
  25 my $status_size = 1;
  26 my $description_size = 1;
  27
  28 GetOptions(
  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
  39 pod2usage(1) if $help;
  40 pod2usage(-exitstatus => 0, -verbose => 2) if $man;
  41
  42 pod2usage(1) if (scalar @ARGV < 1 || @ARGV > 2);
  43
  44 my ($cmd, $arg) = @ARGV;
  45
  46 pod2usage(2) if ($cmd ne "current" && $cmd ne "rest" && $cmd ne "validate"
  47                 && $cmd ne "ls" && $cmd ne "list");
  48
  49 require Data::Dumper if ($debug);
  50
  51 my %data;
  52 my %archs;
  53
  54 #
  55 # Displays an error message, printing file name and line
  56 #
  57 sub 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
  75 my $h_name = "Feature";
  76 my $h_kconfig = "Kconfig";
  77 my $h_description = "Description";
  78 my $h_subsys = "Subsystem";
  79 my $h_status = "Status";
  80 my $h_arch = "Architecture";
  81
  82 my $max_size_name = length($h_name);
  83 my $max_size_kconfig = length($h_kconfig);
  84 my $max_size_description = length($h_description);
  85 my $max_size_subsys = length($h_subsys);
  86 my $max_size_status = length($h_status);
  87
  88 my $max_size_arch = 0;
  89 my $max_size_arch_with_header;
  90 my $max_description_word = 0;
  91
  92 sub 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 #
 211 sub 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 #
 273 sub 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 #
 298 sub 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
 351 sub 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
 375 sub 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 #
 507 find({wanted =>\&parse_feat, no_chdir => 1}, $prefix);
 508
 509 print STDERR Data::Dumper->Dump([\%data], [qw(*data)]) if ($debug);
 510
 511 #
 512 # Handles the command
 513 #
 514 if ($cmd eq "current") {
 515         $arch = qx(uname -m | sed 's/x86_64/x86/' | sed 's/i386/x86/');
 516         $arch =~s/\s+$//;
 517 }
 518
 519 if ($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
 530 if ($cmd ne "validate") {
 531         if ($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
 544 get_feat.pl - parse the Linux Feature files and produce a ReST book.
 545
 546 =head1 SYNOPSIS
 547
 548 B<get_feat.pl> [--debug] [--man] [--help] [--dir=<dir>] [--arch=<arch>]
 549                [--feature=<feature>|--feat=<feature>] <COMAND> [<ARGUMENT>]
 550
 551 Where <COMMAND> can be:
 552
 553 =over 8
 554
 555 B<current>               - output table in ReST compatible ASCII format
 556                            with features for this machine's architecture
 557
 558 B<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
 562 B<validate>              - validate the contents of the files under
 563                            Documentation/features.
 564
 565 B<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
 577 Output features for an specific architecture, optionally filtering for
 578 a single specific feature.
 579
 580 =item B<--feat> or B<--feature>
 581
 582 Output features for a single specific feature.
 583
 584 =item B<--dir>
 585
 586 Changes the location of the Feature files. By default, it uses
 587 the Documentation/features directory.
 588
 589 =item B<--enable-fname>
 590
 591 Prints the file name of the feature files. This can be used in order to
 592 track dependencies during documentation build.
 593
 594 =item B<--debug>
 595
 596 Put the script in verbose mode, useful for debugging. Can be called multiple
 597 times, to increase verbosity.
 598
 599 =item B<--help>
 600
 601 Prints a brief help message and exits.
 602
 603 =item B<--man>
 604
 605 Prints the manual page and exits.
 606
 607 =back
 608
 609 =head1 DESCRIPTION
 610
 611 Parse the Linux feature files from Documentation/features (by default),
 612 optionally producing results at ReST format.
 613
 614 It supports output data per architecture, per feature or a
 615 feature x arch matrix.
 616
 617 When used with B<rest> command, it will use either one of the tree formats:
 618
 619 If neither B<--arch> or B<--feature> arguments are used, it will output a
 620 matrix with features per architecture.
 621
 622 If B<--arch> argument is used, it will output the features availability for
 623 a given architecture.
 624
 625 If B<--feat> argument is used, it will output the content of the feature
 626 file using ReStructured Text markup.
 627
 628 =head1 BUGS
 629
 630 Report bugs to Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
 631
 632 =head1 COPYRIGHT
 633
 634 Copyright (c) 2019 by Mauro Carvalho Chehab <mchehab+samsung@kernel.org>.
 635
 636 License GPLv2: GNU GPL version 2 <http://gnu.org/licenses/gpl.html>.
 637
 638 This is free software: you are free to change and redistribute it.
 639 There is NO WARRANTY, to the extent permitted by law.
 640
 641 =cut