This is a live mirror of the Perl 5 development currently hosted at https://github.com/perl/perl5
Re: [PATCH] Re: [PATCH] Re: perl@10611
[perl5.git] / pod / perltodo.pod
CommitLineData
7711098a
GS
1=head1 NAME
2
3perltodo - Perl TO-DO List
4
5=head1 DESCRIPTION
e50bb9a1 6
722d2a37 7This is a list of wishes for Perl. Send updates to
e50bb9a1
GS
8I<perl5-porters@perl.org>. If you want to work on any of these
9projects, be sure to check the perl5-porters archives for past ideas,
10flames, and propaganda. This will save you time and also prevent you
11from implementing something that Larry has already vetoed. One set
12of archives may be found at:
13
14 http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/
15
722d2a37 16=head1 To do during 5.6.x
e50bb9a1 17
722d2a37 18=head2 Support for I/O disciplines
e50bb9a1 19
722d2a37
SC
20C<perlio> provides this, but the interface could be a lot more
21straightforward.
e50bb9a1 22
722d2a37 23=head2 Eliminate need for "use utf8";
e50bb9a1 24
722d2a37
SC
25While the C<utf8> pragma is autoloaded when necessary, it's still needed
26for things like Unicode characters in a source file. The UTF8 hint can
27always be set to true, but it needs to be set to false when F<utf8.pm>
28is being compiled. (To stop Perl trying to autoload the C<utf8>
29pragma...)
e50bb9a1 30
722d2a37 31=head2 Autoload byte.pm
e50bb9a1 32
722d2a37
SC
33When the lexer sees, for instance, C<bytes::length>, it should
34automatically load the C<bytes> pragma.
e50bb9a1 35
722d2a37 36=head2 Make "\u{XXXX}" et al work
e50bb9a1 37
722d2a37
SC
38Danger, Will Robinson! Discussing the semantics of C<"\x{F00}">,
39C<"\xF00"> and C<"\U{F00}"> on P5P I<will> lead to a long and boring
40flamewar.
e50bb9a1 41
722d2a37 42=head2 Overloadable regex assertions
e50bb9a1 43
722d2a37
SC
44This may or may not be possible with the current regular expression
45engine. The idea is that, for instance, C<\b> needs to be
46algorithmically computed if you're dealing with Thai text. Hence, the
47B<\b> assertion wants to be overloaded by a function.
e50bb9a1 48
722d2a37 49=head2 Unicode collation and normalization
e50bb9a1 50
722d2a37 51Simon Cozens promises to work on this.
e50bb9a1 52
722d2a37
SC
53 Collation? http://www.unicode.org/unicode/reports/tr10/
54 Normalization? http://www.unicode.org/unicode/reports/tr15/
e50bb9a1 55
722d2a37 56=head2 Unicode case mappings
e50bb9a1 57
722d2a37 58 Case Mappings? http://www.unicode.org/unicode/reports/tr21/
e50bb9a1 59
722d2a37 60=head2 Unicode regular expression character classes
e50bb9a1 61
722d2a37 62They have some tricks Perl doesn't yet implement.
e50bb9a1 63
722d2a37 64 http://www.unicode.org/unicode/reports/tr18/
e50bb9a1 65
722d2a37 66=head2 use Thread for iThreads
e50bb9a1 67
722d2a37
SC
68Artur Bergman's C<iThreads> module is a start on this, but needs to
69be more mature.
e50bb9a1 70
dd0afe54
AB
71=head2 make perl_clone optionally clone ops
72
73So that pseudoforking, mod_perl, iThreads and nvi will work properly
74(but not as efficiently) until the regex engine is fixed to be threadsafe.
75
722d2a37 76=head2 Work out exit/die semantics for threads
e50bb9a1 77
722d2a37 78=head2 Typed lexicals for compiler
e50bb9a1 79
722d2a37 80=head2 Compiler workarounds for Win32
e50bb9a1 81
722d2a37 82=head2 AUTOLOADing in the compiler
e50bb9a1 83
722d2a37 84=head2 Fixing comppadlist when compiling
e50bb9a1 85
722d2a37 86=head2 Cleaning up exported namespace
e50bb9a1 87
722d2a37 88=head2 Complete signal handling
e50bb9a1 89
722d2a37
SC
90Add C<PERL_ASYNC_CHECK> to opcodes which loop; replace C<sigsetjmp> with
91C<sigjmp>; check C<wait> for signal safety.
e50bb9a1 92
722d2a37 93=head2 Out-of-source builds
e50bb9a1 94
722d2a37 95This was done for 5.6.0, but needs reworking for 5.7.x
e50bb9a1 96
722d2a37 97=head2 POSIX realtime support
e50bb9a1 98
722d2a37
SC
99POSIX 1003.1 1996 Edition support--realtime stuff: POSIX semaphores,
100message queues, shared memory, realtime clocks, timers, signals (the
101metaconfig units mostly already exist for these)
e50bb9a1 102
722d2a37 103=head2 UNIX98 support
e50bb9a1 104
722d2a37 105Reader-writer locks, realtime/asynchronous IO
e50bb9a1 106
722d2a37 107=head2 IPv6 Support
e50bb9a1 108
722d2a37
SC
109There are non-core modules, such as C<Net::IPv6>, but these will need
110integrating when IPv6 actually starts to really happen. See RFC 2292
111and RFC 2553.
e50bb9a1 112
722d2a37 113=head2 Long double conversion
e50bb9a1 114
722d2a37 115Floating point formatting is still causing some weird test failures.
e50bb9a1 116
722d2a37 117=head2 Locales
e50bb9a1 118
722d2a37
SC
119Locales and Unicode interact with each other in unpleasant ways.
120One possible solution would be to adopt/support ICU:
e50bb9a1 121
722d2a37 122 http://oss.software.ibm.com/developerworks/opensource/icu/project/
e50bb9a1 123
722d2a37 124=head2 Thread-safe regexes
e50bb9a1 125
722d2a37 126The regular expression engine is currently non-threadsafe.
e50bb9a1 127
722d2a37 128=head2 Arithmetic on non-Arabic numerals
e50bb9a1 129
722d2a37 130C<[1234567890]> aren't the only numerals any more.
e50bb9a1 131
722d2a37 132=head2 POSIX Unicode character classes
e50bb9a1 133
722d2a37
SC
134([=a=] for equivalance classes, [.ch.] for collation.)
135These are dependent on Unicode normalization and collation.
e50bb9a1 136
722d2a37 137=head2 Factoring out common suffices/prefices in regexps (trie optimization)
c47ff5f1 138
722d2a37
SC
139Currently, the user has to optimize C<foo|far> and C<foo|goo> into
140C<f(?:oo|ar)> and C<[fg]oo> by hand; this could be done automatically.
e50bb9a1 141
722d2a37 142=head2 Security audit shipped utilities
e50bb9a1 143
722d2a37
SC
144All the code we ship with Perl needs to be sensible about temporary file
145handling, locking, input validation, and so on.
e50bb9a1 146
722d2a37 147=head2 Custom opcodes
e50bb9a1 148
722d2a37
SC
149Have a way to introduce user-defined opcodes without the subroutine call
150overhead of an XSUB; the user should be able to create PP code. Simon
151Cozens has some ideas on this.
e50bb9a1 152
722d2a37 153=head2 spawnvp() on Win32
e50bb9a1 154
722d2a37
SC
155Win32 has problems spawning processes, particularly when the arguments
156to the child process contain spaces, quotes or tab characters.
e50bb9a1 157
722d2a37 158=head2 DLL Versioning
e50bb9a1 159
722d2a37
SC
160Windows needs a way to know what version of a XS or C<libperl> DLL it's
161loading.
e50bb9a1 162
722d2a37 163=head2 Introduce @( and @)
e50bb9a1 164
722d2a37
SC
165C<$(> may return "foo bar baz". Unfortunately, since groups can
166theoretically have spaces in their names, this could be one, two or
167three groups.
e50bb9a1 168
722d2a37 169=head2 Floating point handling
e50bb9a1 170
722d2a37
SC
171C<NaN> and C<inf> support is particularly troublesome.
172(fp_classify(), fp_class(), fp_class_d(), class(), isinf(),
173isfinite(), finite(), isnormal(), unordered(), <ieeefp.h>,
174<fp_class.h> (there are metaconfig units for all these) (I think),
175fp_setmask(), fp_getmask(), fp_setround(), fp_getround()
176(no metaconfig units yet for these). Don't forget finitel(), fp_classl(),
177fp_class_l(), (yes, both do, unfortunately, exist), and unorderedl().)
e50bb9a1 178
722d2a37 179As of Perl 5.6.1 is a Perl macro, Perl_isnan().
e50bb9a1 180
722d2a37 181=head2 IV/UV preservation
e50bb9a1 182
722d2a37
SC
183Nicholas Clark has done a lot of work on this, but work is continuing.
184C<+>, C<-> and C<*> work, but guards need to be in place for C<%>, C</>,
185C<&>, C<oct>, C<hex> and C<pack>.
e50bb9a1 186
722d2a37 187=head2 Replace pod2html with something using Pod::Parser
83df6a1d 188
722d2a37
SC
189The CPAN module C<Malik::Pod::Html> may be a more suitable basis for a
190C<pod2html> convertor; the current one duplicates the functionality
191abstracted in C<Pod::Parser>, which makes updating the POD language
192difficult.
e50bb9a1 193
722d2a37 194=head2 Automate module testing on CPAN
e50bb9a1 195
722d2a37
SC
196When a new Perl is being beta tested, porters have to manually grab
197their favourite CPAN modules and test them - this should be done
198automatically.
e50bb9a1 199
722d2a37 200=head2 sendmsg and recvmsg
83df6a1d 201
722d2a37
SC
202We have all the other BSD socket functions but these. There are
203metaconfig units for these functions which can be added. To avoid these
204being new opcodes, a solution similar to the way C<sockatmark> was added
205would be preferable. (Autoload the C<IO::whatever> module.)
e50bb9a1 206
722d2a37 207=head2 Rewrite perlre documentation
e50bb9a1 208
722d2a37
SC
209The new-style patterns need full documentation, and the whole document
210needs to be a lot clearer.
e50bb9a1 211
722d2a37 212=head2 Convert example code to IO::Handle filehandles
e50bb9a1 213
722d2a37 214=head2 Document Win32 choices
e50bb9a1 215
722d2a37 216=head2 Check new modules
e50bb9a1 217
722d2a37 218=head2 Make roffitall find pods and libs itself
e50bb9a1 219
722d2a37 220Simon Cozens has done some work on this but it needs a rethink.
e50bb9a1 221
722d2a37 222=head1 To do at some point
e50bb9a1 223
722d2a37
SC
224These are ideas that have been regularly tossed around, that most
225people believe should be done maybe during 5.8.x
e50bb9a1 226
722d2a37 227=head2 Remove regular expression recursion
e50bb9a1 228
722d2a37
SC
229Because the regular expression engine is recursive, badly designed
230expressions can lead to lots of recursion filling up the stack. Ilya
231claims that it is easy to convert the engine to being iterative, but
232this has still not yet been done. There may be a regular expression
233engine hit squad meeting at TPC5.
e50bb9a1 234
722d2a37 235=head2 Memory leaks after failed eval
e50bb9a1 236
722d2a37
SC
237Perl will leak memory if you C<eval "hlagh hlagh hlagh hlagh">. This is
238partially because it attempts to build up an op tree for that code and
239doesn't properly free it. The same goes for non-syntactically-correct
240regular expressions. Hugo looked into this, but decided it needed a
241mark-and-sweep GC implementation.
e50bb9a1 242
722d2a37
SC
243Alan notes that: The basic idea was to extend the parser token stack
244(C<YYSTYPE>) to include a type field so we knew what sort of thing each
245element of the stack was. The F<<perly.c> code would then have to be
246postprocessed to record the type of each entry on the stack as it was
247created, and the parser patched so that it could unroll the stack
248properly on error.
e50bb9a1 249
722d2a37
SC
250This is possible to do, but would be pretty messy to implement, as it
251would rely on even more sed hackery in F<perly.fixer>.
e50bb9a1 252
722d2a37 253=head2 pack "(stuff)*"
e50bb9a1 254
722d2a37 255That's to say, C<pack "(sI)40"> would be the same as C<pack "sI"x40>
e50bb9a1 256
722d2a37 257=head2 bitfields in pack
e50bb9a1 258
722d2a37 259=head2 Cross compilation
e50bb9a1 260
722d2a37
SC
261Make Perl buildable with a cross-compiler. This will play havoc with
262Configure, which needs to how how the target system will respond to
263its tests; maybe C<microperl> will be a good starting point here.
264(Indeed, Bart Schuller reports that he compiled up C<microperl> for
265the Agenda PDA and it works fine.) A really big spanner in the works
266is the bootstrapping build process of Perl: if the filesystem the
267target systems sees is not the same what the build host sees, various
268input, output, and (Perl) library files need to be copied back and forth.
e50bb9a1 269
722d2a37 270=head2 Perl preprocessor / macros
e50bb9a1 271
722d2a37
SC
272Source filters help with this, but do not get us all the way. For
273instance, it should be possible to implement the C<??> operator somehow;
274source filters don't (quite) cut it.
e50bb9a1 275
722d2a37 276=head2 Perl lexer in Perl
a45bd81d 277
722d2a37 278Damian Conway is planning to work on this, but it hasn't happened yet.
e50bb9a1 279
722d2a37 280=head2 Using POSIX calls internally
e50bb9a1 281
722d2a37
SC
282When faced with a BSD vs. SySV -style interface to some library or
283system function, perl's roots show in that it typically prefers the BSD
284interface (but falls back to the SysV one). One example is getpgrp().
285Other examples include C<memcpy> vs. C<bcopy>. There are others, mostly in
286F<<pp_sys.c>.
e50bb9a1 287
722d2a37
SC
288Mostly, this item is a suggestion for which way to start a journey into
289an C<#ifdef> forest. It is not primarily a suggestion to eliminate any of
290the C<#ifdef> forests.
e50bb9a1 291
722d2a37
SC
292POSIX calls are perhaps more likely to be portable to unexpected
293architectures. They are also perhaps more likely to be actively
294maintained by a current vendor. They are also perhaps more likely to be
295available in thread-safe versions, if appropriate.
e50bb9a1 296
722d2a37 297=head2 -i rename file when changed
e50bb9a1 298
722d2a37
SC
299It's only necessary to rename a file when inplace editing when the file
300has changed. Detecting a change is perhaps the difficult bit.
e50bb9a1 301
722d2a37 302=head2 All ARGV input should act like E<lt>E<gt>
e50bb9a1 303
722d2a37 304=head2 Support for rerunning debugger
e50bb9a1 305
722d2a37 306There should be a way of restarting the debugger on demand.
e50bb9a1 307
722d2a37 308=head2 my sub foo { }
c47ff5f1 309
722d2a37
SC
310The basic principle is sound, but there are problems with the semantics
311of self-referential and mutually referential lexical subs: how to
312declare the subs?
c47ff5f1 313
722d2a37 314=head2 One-pass global destruction
c47ff5f1 315
722d2a37
SC
316Sweeping away all the allocated memory in one go is a laudable goal, but
317it's difficult and in most cases, it's easier to let the memory get
318freed by exiting.
e50bb9a1 319
722d2a37 320=head2 Rewrite regexp parser
e50bb9a1 321
722d2a37
SC
322There has been talk recently of rewriting the regular expression parser
323to produce an optree instead of a chain of opcodes; it's unclear whether
324or not this would be a win.
e50bb9a1 325
722d2a37 326=head2 Cache recently used regexps
e50bb9a1 327
722d2a37 328This is to speed up
e50bb9a1 329
722d2a37
SC
330 for my $re (@regexps) {
331 $matched++ if /$re/
332 }
e50bb9a1 333
722d2a37
SC
334C<qr//> already gives us a way of saving compiled regexps, but it should
335be done automatically.
e50bb9a1 336
722d2a37 337=head2 Re-entrant functions
e50bb9a1 338
722d2a37
SC
339Add configure probes for C<_r> forms of system calls and fit them to the
340core. Unfortunately, calling conventions for these functions and not
341standardised.
04c70446 342
722d2a37 343=head2 Cross-compilation support
04c70446 344
722d2a37
SC
345Bart Schuller reports that using C<microperl> and a cross-compiler, he
346got Perl working on the Agenda PDA. However, one cannot build a full
347Perl because Configure needs to get the results for the target platform,
348for the host.
e50bb9a1 349
722d2a37 350=head2 Bit-shifting bitvectors
e50bb9a1 351
722d2a37 352Given:
e50bb9a1 353
722d2a37 354 vec($v, 1000, 1) = 1;
e50bb9a1 355
722d2a37 356One should be able to do
e50bb9a1 357
722d2a37 358 $v <<= 1;
e50bb9a1 359
722d2a37 360and have the 999'th bit set.
e50bb9a1 361
722d2a37
SC
362Currently if you try with shift bitvectors you shift the NV/UV, instead
363of the bits in the PV. Not very logical.
e50bb9a1 364
722d2a37 365=head2 debugger pragma
e50bb9a1 366
722d2a37
SC
367The debugger is implemented in Perl in F<perl5db.pl>; turning it into a
368pragma should be easy, but making it work lexically might be more
369difficult. Fiddling with C<$^P> would be necessary.
e50bb9a1 370
722d2a37 371=head2 use less pragma
e50bb9a1 372
722d2a37
SC
373Identify areas where speed/memory tradeoffs can be made and have a hint
374to switch between them.
e50bb9a1 375
722d2a37 376=head2 switch structures
e50bb9a1 377
722d2a37
SC
378Although we have C<Switch.pm> in core, Larry points to the dormant
379C<nswitch> and C<cswitch> ops in F<pp.c>; using these opcodes would be
380much faster.
e50bb9a1 381
722d2a37 382=head2 Cache eval tree
e50bb9a1 383
722d2a37 384=head2 rcatmaybe
e50bb9a1 385
722d2a37 386=head2 Shrink opcode tables
e50bb9a1 387
722d2a37 388=head2 Optimize away @_
e50bb9a1 389
722d2a37 390Look at the "reification" code in C<av.c>
e50bb9a1 391
722d2a37 392=head2 Prototypes versus indirect objects
e50bb9a1 393
722d2a37 394Currently, indirect object syntax bypasses prototype checks.
e50bb9a1 395
722d2a37 396=head2 Install HMTL
e50bb9a1 397
722d2a37
SC
398HTML versions of the documentation need to be installed by default; a
399call to C<installhtml> from C<installperl> may be all that's necessary.
e50bb9a1 400
722d2a37 401=head2 Prototype method calls
e50bb9a1 402
722d2a37 403=head2 Return context prototype declarations
e50bb9a1 404
722d2a37 405=head2 magic_setisa
e50bb9a1 406
722d2a37 407=head2 Garbage collection
e50bb9a1 408
722d2a37
SC
409There have been persistent mumblings about putting a mark-and-sweep
410garbage detector into Perl; Alan Burlison has some ideas about this.
e50bb9a1 411
722d2a37 412=head2 IO tutorial
e50bb9a1 413
722d2a37 414Mark-Jason Dominus has the beginnings of one of these.
e50bb9a1 415
722d2a37 416=head2 pack/unpack tutorial
e50bb9a1 417
722d2a37 418Simon Cozens has the beginnings of one of these.
e50bb9a1 419
722d2a37 420=head2 Rewrite perldoc
e50bb9a1 421
722d2a37
SC
422There are a few suggestions for what to do with C<perldoc>: maybe a
423full-text search, an index function, locating pages on a particular
424high-level subject, and so on.
e50bb9a1 425
3958b146 426=head2 Install .3p manpages
e50bb9a1 427
3958b146 428This is a bone of contention; we can create C<.3p> manpages for each
722d2a37
SC
429built-in function, but should we install them by default? Tcl does this,
430and it clutters up C<apropos>.
e50bb9a1 431
722d2a37 432=head2 Unicode tutorial
e50bb9a1 433
722d2a37 434Simon Cozens promises to do this before he gets old.
e50bb9a1 435
722d2a37 436=head2 Update POSIX.pm for 1003.1-2
3958b146 437
722d2a37 438=head2 Retargetable installation
e50bb9a1 439
722d2a37 440Allow C<@INC> to be changed after Perl is built.
e50bb9a1 441
722d2a37 442=head2 POSIX emulation on non-POSIX systems
e50bb9a1 443
722d2a37
SC
444Make C<POSIX.pm> behave as POSIXly as possible everywhere, meaning we
445have to implement POSIX equivalents for some functions if necessary.
e50bb9a1 446
722d2a37 447=head2 Rename Win32 headers
e50bb9a1 448
722d2a37
SC
449=head2 Finish off lvalue functions
450
451They don't work in the debugger, and they don't work for list or hash
452slices.
e50bb9a1 453
722d2a37 454=head2 Update sprintf documentation
e50bb9a1 455
722d2a37 456Hugo van der Sanden plans to look at this.
e50bb9a1 457
722d2a37 458=head2 Use fchown/fchmod internally
e50bb9a1 459
722d2a37
SC
460This has been done in places, but needs a thorough code review.
461Also fchdir is available in some platforms.
e50bb9a1 462
722d2a37 463=head1 Vague ideas
e50bb9a1 464
722d2a37 465Ideas which have been discussed, and which may or may not happen.
e50bb9a1 466
722d2a37 467=head2 ref() in list context
e50bb9a1 468
722d2a37
SC
469It's unclear what this should do or how to do it without breaking old
470code.
e50bb9a1 471
722d2a37 472=head2 Make tr/// return histogram
e50bb9a1 473
722d2a37 474There is a patch for this, but it may require Unicodification.
e50bb9a1 475
722d2a37 476=head2 Compile to real threaded code
3958b146 477
722d2a37 478=head2 Structured types
3958b146 479
722d2a37 480=head2 Modifiable $1 et al.
e50bb9a1 481
722d2a37
SC
482 ($x = "elephant") =~ /e(ph)/;
483 $1 = "g"; # $x = "elegant"
e50bb9a1 484
722d2a37
SC
485What happens if there are multiple (nested?) brackets? What if the
486string changes between the match and the assignment?
e50bb9a1 487
722d2a37 488=head2 Procedural interfaces for IO::*, etc.
e50bb9a1 489
722d2a37
SC
490Some core modules have been accused of being overly-OO. Adding
491procedural interfaces could demystify them.
e50bb9a1 492
722d2a37 493=head2 RPC modules
e50bb9a1 494
722d2a37 495=head2 Attach/detach debugger from running program
e50bb9a1 496
722d2a37
SC
497With C<gdb>, you can attach the debugger to a running program if you
498pass the process ID. It would be good to do this with the Perl debugger
499on a running Perl program, although I'm not sure how it would be done.
e50bb9a1 500
722d2a37 501=head2 Alternative RE syntax module
e50bb9a1 502
722d2a37
SC
503 use Regex::Newbie;
504 $re = Regex::Newbie->new
505 ->start
506 ->match("foo")
507 ->repeat(Regex::Newbie->class("char"),3)
508 ->end;
509 /$re/;
e50bb9a1 510
722d2a37 511=head2 GUI::Native
e50bb9a1 512
722d2a37
SC
513A non-core module that would use "native" GUI to create graphical
514applications.
e50bb9a1 515
722d2a37 516=head2 foreach(reverse ...)
e50bb9a1 517
722d2a37 518Currently
e50bb9a1 519
722d2a37 520 foreach (reverse @_) { ... }
e50bb9a1 521
722d2a37
SC
522puts C<@_> on the stack, reverses it putting the reversed version on the
523stack, then iterates forwards. Instead, it could be special-cased to put
524C<@_> on the stack then iterate backwards.
e50bb9a1 525
722d2a37 526=head2 Constant function cache
e50bb9a1 527
722d2a37 528=head2 Approximate regular expression matching
e50bb9a1 529
722d2a37 530=head1 Ongoing
e50bb9a1 531
722d2a37 532These items B<always> need doing:
e50bb9a1 533
722d2a37 534=head2 Update guts documentation
e50bb9a1 535
722d2a37
SC
536Simon Cozens tries to do this when possible, and contributions to the
537C<perlapi> documentation is welcome.
e50bb9a1 538
722d2a37 539=head2 Add more tests
e50bb9a1 540
722d2a37
SC
541Michael Schwern will donate $500 to Yet Another Society when all core
542modules have tests.
e50bb9a1 543
722d2a37 544=head2 Update auxiliary tools
e50bb9a1 545
722d2a37 546The code we ship with Perl should look like good Perl 5.
e50bb9a1 547
722d2a37 548=head1 Recently done things
e50bb9a1 549
722d2a37
SC
550These are things which have been on the todo lists in previous releases
551but have recently been completed.
e50bb9a1 552
722d2a37 553=head2 Safe signal handling
e50bb9a1 554
722d2a37
SC
555A new signal model went into 5.7.1 without much fanfare. Operations and
556C<malloc>s are no longer interrupted by signals, which are handled
557between opcodes. This means that C<PERL_ASYNC_CHECK> now actually does
558something. However, there are still a few things that need to be done.
e50bb9a1 559
722d2a37 560=head2 Tie Modules
e50bb9a1 561
722d2a37
SC
562Modules which implement arrays in terms of strings, substrings or files
563can be found on the CPAN.
e50bb9a1 564
722d2a37 565=head2 gettimeofday
e50bb9a1 566
722d2a37 567C<Time::Hires> has been integrated into the core.
e50bb9a1 568
722d2a37 569=head2 setitimer and getimiter
e50bb9a1 570
722d2a37 571Adding C<Time::Hires> got us this too.
e50bb9a1 572
722d2a37
SC
573=head2 Testing __DIE__ hook
574
575Tests have been added.
576
577=head2 CPP equivalent in Perl
e50bb9a1 578
722d2a37
SC
579A C Yardley will probably have done this by the time you can read this.
580This allows for a generalization of the C constant detection used in
581building C<Errno.pm>.
e50bb9a1 582
722d2a37 583=head2 Explicit switch statements
e50bb9a1 584
722d2a37
SC
585C<Switch.pm> has been integrated into the core to give you all manner of
586C<switch...case> semantics.
e50bb9a1 587
722d2a37 588=head2 autocroak
e50bb9a1 589
722d2a37 590This is C<Fatal.pm>.
e50bb9a1 591
722d2a37 592=head2 UTF/EBCDIC
e50bb9a1 593
722d2a37 594Nick Ing-Simmons has made UTF-EBCDIC (UTR13) work with Perl.
e50bb9a1 595
722d2a37 596 EBCDIC? http://www.unicode.org/unicode/reports/tr16/
e50bb9a1 597
722d2a37 598=head2 UTF Regexes
e50bb9a1 599
722d2a37
SC
600Although there are probably some small bugs to be rooted out, Jarkko
601Hietaniemi has made regular expressions polymorphic between bytes and
602characters.
e50bb9a1 603
722d2a37 604=head2 perlcc to produce executable
e50bb9a1 605
722d2a37
SC
606C<perlcc> was recently rewritten, and can now produce standalone
607executables.
e50bb9a1 608
722d2a37 609=head2 END blocks saved in compiled output
e50bb9a1 610
722d2a37 611=head2 Secure temporary file module
e50bb9a1 612
722d2a37 613Tim Jenness' C<File::Temp> is now in core.
e50bb9a1 614
722d2a37 615=head2 Integrate Time::HiRes
e50bb9a1 616
722d2a37 617This module is now part of core.
e50bb9a1 618
722d2a37 619=head2 Turn Cwd into XS
e50bb9a1 620
722d2a37 621Benjamin Sugars has done this.
e50bb9a1 622
722d2a37 623=head2 Mmap for input
e50bb9a1 624
722d2a37 625Nick Ing-Simmons' C<perlio> supports an C<mmap> IO method.
e50bb9a1 626
722d2a37 627=head2 Byte to/from UTF8 and UTF8 to/from local conversion
e50bb9a1 628
722d2a37 629C<Encode> provides this.
e50bb9a1 630
722d2a37 631=head2 Add sockatmark support
e50bb9a1 632
722d2a37 633Added in 5.7.1
e50bb9a1 634
722d2a37
SC
635=head2 Mailing list archives
636
637http://lists.perl.org/, http://archive.develooper.com/
638
639=head2 Bug tracking
640
641Richard Foley has written the bug tracking system at http://bugs.perl.org/
e50bb9a1 642
722d2a37 643=head2 Integrate MacPerl
e50bb9a1 644
722d2a37
SC
645Chris Nandor and Matthias Neeracher have integrated the MacPerl changes
646into 5.6.0.
e50bb9a1 647
722d2a37 648=head2 Web "nerve center" for Perl
e50bb9a1 649
722d2a37 650http://use.perl.org/ is what you're looking for.
e50bb9a1 651
722d2a37 652=head2 Regular expression tutorial
e50bb9a1 653
722d2a37 654C<perlretut>, provided by Mark Kvale.
e50bb9a1 655
722d2a37 656=head2 Debugging Tutorial
e50bb9a1 657
722d2a37 658C<perldebtut>, written by Richard Foley.
e50bb9a1 659
722d2a37 660=head2 Integrate new modules
e50bb9a1 661
722d2a37 662Jarkko has been integrating madly into 5.7.x
e50bb9a1 663
722d2a37 664=head2 Integrate profiler
e50bb9a1 665
722d2a37 666C<Devel::DProf> is now a core module.
e50bb9a1 667
722d2a37 668=head2 Y2K error detection
e50bb9a1 669
722d2a37
SC
670There's a configure option to detect unsafe concatenation with "19", and
671a CPAN module. (C<D'oh::Year>)
e50bb9a1 672
722d2a37 673=head2 Regular expression debugger
e50bb9a1 674
722d2a37
SC
675While not part of core, Mark-Jason Dominus has written C<Rx> and has
676also come up with a generalised strategy for regular expression
677debugging.
e50bb9a1 678
722d2a37 679=head2 POD checker
e50bb9a1 680
722d2a37 681That's, uh, F<podchecker>
e50bb9a1 682
722d2a37 683=head2 "Dynamic" lexicals
e50bb9a1 684
722d2a37 685=head2 Cache precompiled modules
e50bb9a1 686
722d2a37 687=head1 Deprecated Wishes
e50bb9a1 688
722d2a37
SC
689These are items which used to be in the todo file, but have been
690deprecated for some reason.
e50bb9a1 691
722d2a37 692=head2 Loop control on do{}
e50bb9a1 693
722d2a37 694This would break old code; use C<do{{ }}> instead.
e50bb9a1 695
722d2a37 696=head2 Lexically scoped typeglobs
e50bb9a1 697
722d2a37 698Not needed now we have lexical IO handles.
e50bb9a1 699
722d2a37 700=head2 format BOTTOM
3958b146 701
722d2a37 702=head2 report HANDLE
e50bb9a1 703
722d2a37 704Damian Conway's text formatting modules seem to be the Way To Go.
e50bb9a1 705
722d2a37 706=head2 Generalised want()/caller())
3958b146 707
722d2a37 708=head2 Named prototypes
e50bb9a1 709
722d2a37 710These both seem to be delayed until Perl 6.
e50bb9a1 711
722d2a37 712=head2 Built-in globbing
e50bb9a1 713
722d2a37 714The C<File::Glob> module has been used to replace the C<glob> function.
e50bb9a1 715
722d2a37 716=head2 Regression tests for suidperl
e50bb9a1 717
722d2a37 718C<suidperl> is deprecated in favour of common sense.
e50bb9a1 719
722d2a37 720=head2 Cached hash values
e50bb9a1 721
722d2a37 722We have shared hash keys, which perform the same job.
e50bb9a1 723
722d2a37 724=head2 Add compression modules
e50bb9a1 725
722d2a37
SC
726The compression modules are a little heavy; meanwhile, Nick Clark is
727working on experimental pragmata to do transparent decompression on
728input.
e50bb9a1 729
722d2a37 730=head2 Reorganise documentation into tutorials/references
e50bb9a1 731
722d2a37 732Could not get consensus on P5P about this.
e50bb9a1 733
722d2a37
SC
734=head2 Remove distinction between functions and operators
735
736Caution: highly flammable.
737
738=head2 Make XS easier to use
e50bb9a1 739
722d2a37 740Use C<Inline> instead, or SWIG.
e50bb9a1 741
722d2a37 742=head2 Make embedding easier to use
e50bb9a1 743
722d2a37 744Use C<Inline::CPR>.
e50bb9a1 745
722d2a37 746=head2 man for perl
04c70446 747
722d2a37 748See the Perl Power Tools. (http://language.perl.com/ppt/)
04c70446 749
722d2a37 750=head2 my $Package::variable
04c70446 751
722d2a37 752Use C<our> instead.
04c70446 753
722d2a37 754=head2 "or" tests defined, not truth
04c70446 755
722d2a37 756Suggesting this on P5P B<will> cause a boring and interminable flamewar.
04c70446 757
722d2a37 758=head2 "class"-based lexicals
04c70446 759
cbb3fa72 760Use flyweight objects, secure hashes or, dare I say it, pseudo-hashes instead.
04c70446 761
722d2a37 762=head2 byteperl
04c70446 763
722d2a37 764C<ByteLoader> covers this.
04c70446 765
722d2a37 766=head2 Lazy evaluation / tail recursion removal
04c70446 767
722d2a37
SC
768C<List::Util> in core gives some of these; tail recursion removal is
769done manually, with C<goto &whoami;>. (However, MJD has found that
770C<goto &whoami> introduces a performance penalty, so maybe there should
771be a way to do this after all: C<sub foo {START: ... goto START;> is
772better.)