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