IkiWiki/Plugin/darcs.pm

   1 #!/usr/bin/perl
   2 package IkiWiki::Plugin::darcs;
   3
   4 use warnings;
   5 use strict;
   6 use IkiWiki;
   7
   8 sub import {
   9         hook(type => "checkconfig", id => "darcs", call => \&checkconfig);
  10         hook(type => "getsetup", id => "darcs", call => \&getsetup);
  11         hook(type => "rcs", id => "rcs_update", call => \&rcs_update);
  12         hook(type => "rcs", id => "rcs_prepedit", call => \&rcs_prepedit);
  13         hook(type => "rcs", id => "rcs_commit", call => \&rcs_commit);
  14         hook(type => "rcs", id => "rcs_commit_staged", call => \&rcs_commit_staged);
  15         hook(type => "rcs", id => "rcs_add", call => \&rcs_add);
  16         hook(type => "rcs", id => "rcs_remove", call => \&rcs_remove);
  17         hook(type => "rcs", id => "rcs_rename", call => \&rcs_rename);
  18         hook(type => "rcs", id => "rcs_recentchanges", call => \&rcs_recentchanges);
  19         hook(type => "rcs", id => "rcs_diff", call => \&rcs_diff);
  20         hook(type => "rcs", id => "rcs_getctime", call => \&rcs_getctime);
  21         hook(type => "rcs", id => "rcs_getmtime", call => \&rcs_getmtime);
  22 }
  23
  24 sub silentsystem (@) {
  25         open(SAVED_STDOUT, ">&STDOUT");
  26         open(STDOUT, ">/dev/null");
  27         my $ret = system @_;
  28         open(STDOUT, ">&SAVED_STDOUT");
  29         return $ret;
  30 }
  31
  32 sub darcs_info ($$$) {
  33         my $field = shift;
  34         my $repodir = shift;
  35         my $file = shift; # Relative to the repodir.
  36
  37         my $child = open(DARCS_CHANGES, "-|");
  38         if (! $child) {
  39                 exec('darcs', 'changes', '--repodir', $repodir, '--xml-output', $file) or
  40                         error("failed to run 'darcs changes'");
  41         }
  42
  43         # Brute force for now.  :-/
  44         while (<DARCS_CHANGES>) {
  45                 last if /^<\/created_as>$/;
  46         }
  47         ($_) = <DARCS_CHANGES> =~ /$field=\'([^\']+)/;
  48         $field eq 'hash' and s/\.gz//; # Strip away the '.gz' from 'hash'es.
  49
  50         close(DARCS_CHANGES);
  51
  52         return $_;
  53 }
  54
  55 sub file_in_vc ($$) {
  56         my $repodir = shift;
  57         my $file = shift;
  58
  59         my $child = open(DARCS_MANIFEST, "-|");
  60         if (! $child) {
  61                 exec('darcs', 'query', 'manifest', '--repodir', $repodir) or
  62                         error("failed to run 'darcs query manifest'");
  63         }
  64         my $found=0;
  65         while (<DARCS_MANIFEST>) {
  66                 $found = 1 if /^(\.\/)?$file$/;
  67         }
  68         close(DARCS_MANIFEST) or error("'darcs query manifest' exited " . $?);
  69
  70         return $found;
  71 }
  72
  73 sub darcs_rev ($) {
  74         my $file = shift; # Relative to the repodir.
  75         my $repodir = $config{srcdir};
  76
  77         return "" unless file_in_vc($repodir, $file);
  78         my $hash = darcs_info('hash', $repodir, $file);
  79         return defined $hash ? $hash : "";
  80 }
  81
  82 sub checkconfig () {
  83         if (defined $config{darcs_wrapper} && length $config{darcs_wrapper}) {
  84                 push @{$config{wrappers}}, {
  85                         wrapper => $config{darcs_wrapper},
  86                         wrappermode => (defined $config{darcs_wrappermode} ? $config{darcs_wrappermode} : "06755"),
  87                 };
  88         }
  89 }
  90
  91 sub getsetup () {
  92         return
  93                 plugin => {
  94                         safe => 0, # rcs plugin
  95                         rebuild => undef,
  96                         section => "rcs",
  97                 },
  98                 darcs_wrapper => {
  99                         type => "string",
 100                         example => "/darcs/repo/_darcs/ikiwiki-wrapper",
 101                         description => "wrapper to generate (set as master repo apply hook)",
 102                         safe => 0, # file
 103                         rebuild => 0,
 104                 },
 105                 darcs_wrappermode => {
 106                         type => "string",
 107                         example => '06755',
 108                         description => "mode for darcs_wrapper (can safely be made suid)",
 109                         safe => 0,
 110                         rebuild => 0,
 111                 },
 112                 historyurl => {
 113                         type => "string",
 114                         example => "http://darcs.example.com/darcsweb.cgi?r=wiki;a=filehistory;f=[[file]]",
 115                         description => "darcsweb url to show file history ([[file]] substituted)",
 116                         safe => 1,
 117                         rebuild => 1,
 118                 },
 119                 diffurl => {
 120                         type => "string",
 121                         example => "http://darcs.example.com/darcsweb.cgi?r=wiki;a=filediff;h=[[hash]];f=[[file]]",
 122                         description => "darcsweb url to show a diff ([[hash]] and [[file]] substituted)",
 123                         safe => 1,
 124                         rebuild => 1,
 125                 },
 126 }
 127
 128 sub rcs_update () {
 129         silentsystem('darcs', "pull", "--repodir", $config{srcdir}, "-qa")
 130 }
 131
 132 sub rcs_prepedit ($) {
 133         # Prepares to edit a file under revision control.  Returns a token that
 134         # must be passed to rcs_commit() when the file is to be commited.  For us,
 135         # this token the hash value of the latest patch that modifies the file,
 136         # i.e. something like its current revision.
 137
 138         my $file = shift; # Relative to the repodir.
 139         my $rev = darcs_rev($file);
 140         return $rev;
 141 }
 142
 143 sub commitauthor (@) {
 144         my %params=@_;
 145
 146         my $author="anon\@web";
 147         if (defined $params{session}) {
 148                 if (defined $params{session}->param("name")) {
 149                         return $params{session}->param("name").'@web';
 150                 }
 151                 elsif (defined $params{session}->remote_addr()) {
 152                         return $params{session}->remote_addr().'@web';
 153                 }
 154         }
 155         return 'anon@web';
 156 }
 157
 158 sub rcs_commit (@) {
 159         # Commit the page.  Returns 'undef' on success and a version of the page
 160         # with conflict markers on failure.
 161         my %params=@_;
 162
 163         my ($file, $message, $token) =
 164                 ($params{file}, $params{message}, $params{token});
 165
 166         # Compute if the "revision" of $file changed.
 167         my $changed = darcs_rev($file) ne $token;
 168
 169         # Yes, the following is a bit convoluted.
 170         if ($changed) {
 171                 # TODO.  Invent a better, non-conflicting name.
 172                 rename("$config{srcdir}/$file", "$config{srcdir}/$file.save") or
 173                         error("failed to rename $file to $file.save: $!");
 174
 175                 # Roll the repository back to $token.
 176
 177                 # TODO.  Can we be sure that no changes are lost?  I think that
 178                 # we can, if we make sure that the 'darcs push' below will always
 179                 # succeed.
 180
 181                 # We need to revert everything as 'darcs obliterate' might choke
 182                 # otherwise.
 183                 # TODO: 'yes | ...' needed?  Doesn't seem so.
 184                 silentsystem('darcs', "revert", "--repodir", $config{srcdir}, "--all") == 0 ||
 185                         error("'darcs revert' failed");
 186                 # Remove all patches starting at $token.
 187                 my $child = open(DARCS_OBLITERATE, "|-");
 188                 if (! $child) {
 189                         open(STDOUT, ">/dev/null");
 190                         exec('darcs', "obliterate", "--repodir", $config{srcdir},
 191                            "--match", "hash " . $token) and
 192                            error("'darcs obliterate' failed");
 193                 }
 194                 1 while print DARCS_OBLITERATE "y";
 195                 close(DARCS_OBLITERATE);
 196                 # Restore the $token one.
 197                 silentsystem('darcs', "pull", "--quiet", "--repodir", $config{srcdir},
 198                         "--match", "hash " . $token, "--all") == 0 ||
 199                         error("'darcs pull' failed");
 200
 201                 # We're back at $token.  Re-install the modified file.
 202                 rename("$config{srcdir}/$file.save", "$config{srcdir}/$file") or
 203                         error("failed to rename $file.save to $file: $!");
 204         }
 205
 206         # Record the changes.
 207         my $author=commitauthor(%params);
 208         if (!defined $message || !length($message)) {
 209                 $message = "empty message";
 210         }
 211         silentsystem('darcs', 'record', '--repodir', $config{srcdir}, '--all',
 212                         '-m', $message, '--author', $author, $file) == 0 ||
 213                 error("'darcs record' failed");
 214
 215         # Update the repository by pulling from the default repository, which is
 216         # master repository.
 217         silentsystem('darcs', "pull", "--quiet", "--repodir", $config{srcdir},
 218                 "--all") == 0 || error("'darcs pull' failed");
 219
 220         # If this updating yields any conflicts, we'll record them now to resolve
 221         # them.  If nothing is recorded, there are no conflicts.
 222         $token = darcs_rev($file);
 223         # TODO: Use only the first line here, i.e. only the patch name?
 224         writefile("$file.log", $config{srcdir}, 'resolve conflicts: ' . $message);
 225         silentsystem('darcs', 'record', '--repodir', $config{srcdir}, '--all',
 226                 '-m', 'resolve conflicts: ' . $message, '--author', $author, $file) == 0 ||
 227                 error("'darcs record' failed");
 228         my $conflicts = darcs_rev($file) ne $token;
 229         unlink("$config{srcdir}/$file.log") or
 230                 error("failed to remove '$file.log'");
 231
 232         # Push the changes to the main repository.
 233         silentsystem('darcs', 'push', '--quiet', '--repodir', $config{srcdir}, '--all') == 0 ||
 234                 error("'darcs push' failed");
 235         # TODO: darcs send?
 236
 237         if ($conflicts) {
 238                 my $document = readfile("$config{srcdir}/$file");
 239                 # Try to leave everything in a consistent state.
 240                 # TODO: 'yes | ...' needed?  Doesn't seem so.
 241                 silentsystem('darcs', "revert", "--repodir", $config{srcdir}, "--all") == 0 ||
 242                         warn("'darcs revert' failed");
 243                 return $document;
 244         }
 245         else {
 246                 return undef;
 247         }
 248 }
 249
 250 sub rcs_commit_staged (@) {
 251         my %params=@_;
 252
 253         my $author=commitauthor(%params);
 254         if (!defined $params{message} || !length($params{message})) {
 255                 $params{message} = "empty message";
 256         }
 257
 258         silentsystem('darcs', "record", "--repodir", $config{srcdir},
 259                 "-a", "-A", $author,
 260                 "-m", $params{message},
 261         ) == 0 || error("'darcs record' failed");
 262
 263         # Push the changes to the main repository.
 264         silentsystem('darcs', 'push', '--quiet', '--repodir', $config{srcdir}, '--all') == 0 ||
 265                 error("'darcs push' failed");
 266         # TODO: darcs send?
 267
 268         return undef;
 269 }
 270
 271 sub rcs_add ($) {
 272         my $file = shift; # Relative to the repodir.
 273
 274         if(! file_in_vc($config{srcdir}, $file)) {
 275                 # Intermediate directories will be added automagically.
 276                 system('darcs', 'add', '--quiet', '--repodir', $config{srcdir},
 277                         '--boring', $file) == 0 || error("'darcs add' failed");
 278         }
 279 }
 280
 281 sub rcs_remove ($) {
 282         my $file = shift; # Relative to the repodir.
 283
 284         unlink($config{srcdir}.'/'.$file);
 285 }
 286
 287 sub rcs_rename ($$) {
 288         my $a = shift; # Relative to the repodir.
 289         my $b = shift; # Relative to the repodir.
 290
 291         system('darcs', 'mv', '--repodir', $config{srcdir}, $a, $b) == 0 ||
 292                 error("'darcs mv' failed");
 293 }
 294
 295 sub rcs_recentchanges ($) {
 296         my $num=shift;
 297         my @ret;
 298
 299         eval q{use Date::Parse};
 300         eval q{use XML::Simple};
 301
 302         my $repodir=$config{srcdir};
 303
 304         my $child = open(LOG, "-|");
 305         if (! $child) {
 306                 $ENV{"DARCS_DONT_ESCAPE_ANYTHING"}=1;
 307                 exec("darcs", "changes", "--xml",
 308                         "--summary",
 309                          "--repodir", "$repodir",
 310                          "--last", "$num")
 311                 || error("'darcs changes' failed to run");
 312         }
 313         my $data;
 314         $data .= $_ while(<LOG>);
 315         close LOG;
 316
 317         my $log = XMLin($data, ForceArray => 1);
 318
 319         foreach my $patch (@{$log->{patch}}) {
 320                 my $date=$patch->{local_date};
 321                 my $hash=$patch->{hash};
 322                 my $when=str2time($date);
 323                 my (@pages, @files, @pg);
 324                 push @pages, $_ foreach (@{$patch->{summary}->[0]->{modify_file}});
 325                 push @pages, $_ foreach (@{$patch->{summary}->[0]->{add_file}});
 326                 push @pages, $_ foreach (@{$patch->{summary}->[0]->{remove_file}});
 327                 foreach my $f (@pages) {
 328                         $f = $f->{content} if ref $f;
 329                         $f =~ s,^\s+,,; $f =~ s,\s+$,,; # cut whitespace
 330
 331                         push @files, $f;
 332                 }
 333                 foreach my $p (@{$patch->{summary}->[0]->{move}}) {
 334                         push @files, $p->{from};
 335                 }
 336
 337                 foreach my $f (@files) {
 338                         my $d = defined $config{'diffurl'} ? $config{'diffurl'} : "";
 339                         $d =~ s/\[\[file\]\]/$f/go;
 340                         $d =~ s/\[\[hash\]\]/$hash/go;
 341
 342                         push @pg, {
 343                                 page => pagename($f),
 344                                 diffurl => $d,
 345                         };
 346                 }
 347                 next unless (scalar @pg > 0);
 348
 349                 my @message;
 350                 push @message, { line => $_ } foreach (@{$patch->{name}});
 351
 352                 my $committype;
 353                 my $author;
 354                 if ($patch->{author} =~ /(.*)\@web$/) {
 355                         $author = $1;
 356                         $committype = "web";
 357                 }
 358                 else {
 359                         $author=$patch->{author};
 360                         $committype = "darcs";
 361                 }
 362
 363                 push @ret, {
 364                         rev => $patch->{hash},
 365                         user => $author,
 366                         committype => $committype,
 367                         when => $when,
 368                         message => [@message],
 369                         pages => [@pg],
 370                 };
 371         }
 372
 373         return @ret;
 374 }
 375
 376 sub rcs_diff ($;$) {
 377         my $rev=shift;
 378         my $maxlines=shift;
 379         my @lines;
 380         my $repodir=$config{srcdir};
 381         foreach my $line (`darcs diff --repodir  $repodir --match 'hash $rev'`) {
 382                 if (@lines || $line=~/^diff/) {
 383                         last if defined $maxlines && @lines == $maxlines;
 384                         push @lines, $line."\n";
 385                 }
 386         }
 387         if (wantarray) {
 388                 return @lines;
 389         }
 390         else {
 391                 return join("", @lines);
 392         }
 393 }
 394
 395 sub rcs_getctime ($) {
 396         my $file=shift;
 397
 398         eval q{use Date::Parse};
 399         eval q{use XML::Simple};
 400         local $/=undef;
 401
 402         my $child = open(LOG, "-|");
 403         if (! $child) {
 404                 exec("darcs", "changes", "--xml", "--reverse",
 405                         "--repodir", $config{srcdir}, $file)
 406                 || error("'darcs changes $file' failed to run");
 407         }
 408
 409         my $data;
 410         {
 411                 local $/=undef;
 412                 $data = <LOG>;
 413         }
 414         close LOG;
 415
 416         my $log = XMLin($data, ForceArray => 1);
 417
 418         my $datestr = $log->{patch}[0]->{local_date};
 419
 420         if (! defined $datestr) {
 421                 warn "failed to get ctime for $file";
 422                 return 0;
 423         }
 424
 425         my $date = str2time($datestr);
 426
 427         debug("ctime for '$file': ". localtime($date));
 428
 429         return $date;
 430 }
 431
 432 sub rcs_getmtime ($) {
 433         error "rcs_getmtime is not implemented for darcs\n"; # TODO
 434 }
 435
 436 1