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1=head1 NAME
3perltodo - Perl TO-DO List
e50bb9a1 6
722d2a37 7This is a list of wishes for Perl. Send updates to
8I<>. 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:
722d2a37 16=head1 To do during 5.6.x
e50bb9a1 17
722d2a37 18=head2 Support for I/O disciplines
e50bb9a1 19
20C<perlio> provides this, but the interface could be a lot more
e50bb9a1 22
722d2a37 23=head2 Eliminate need for "use utf8";
e50bb9a1 24
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<>
28is being compiled. (To stop Perl trying to autoload the C<utf8>
e50bb9a1 30
31=head2 Create a char *sv_printify(sv, STRLEN *lenp, UV flags) function
33For displaying PVs with control characters, embedded nulls, and Unicode.
34This would be useful for printing warnings, or data and regex dumping,
35not_a_number(), and so on.
722d2a37 37=head2 Autoload
e50bb9a1 38
39When the lexer sees, for instance, C<bytes::length>, it should
40automatically load the C<bytes> pragma.
e50bb9a1 41
722d2a37 42=head2 Make "\u{XXXX}" et al work
e50bb9a1 43
44Danger, Will Robinson! Discussing the semantics of C<"\x{F00}">,
45C<"\xF00"> and C<"\U{F00}"> on P5P I<will> lead to a long and boring
e50bb9a1 47
722d2a37 48=head2 Overloadable regex assertions
e50bb9a1 49
50This may or may not be possible with the current regular expression
51engine. The idea is that, for instance, C<\b> needs to be
52algorithmically computed if you're dealing with Thai text. Hence, the
53B<\b> assertion wants to be overloaded by a function.
e50bb9a1 54
722d2a37 55=head2 Unicode collation and normalization
e50bb9a1 56
722d2a37 57Simon Cozens promises to work on this.
e50bb9a1 58
59 Collation?
60 Normalization?
e50bb9a1 61
722d2a37 62=head2 Unicode case mappings
e50bb9a1 63
722d2a37 64 Case Mappings?
e50bb9a1 65
722d2a37 66=head2 Unicode regular expression character classes
e50bb9a1 67
722d2a37 68They have some tricks Perl doesn't yet implement.
e50bb9a1 69
722d2a37 70
e50bb9a1 71
722d2a37 72=head2 use Thread for iThreads
e50bb9a1 73
74Artur Bergman's C<iThreads> module is a start on this, but needs to
75be more mature.
e50bb9a1 76
77=head2 make perl_clone optionally clone ops
79So that pseudoforking, mod_perl, iThreads and nvi will work properly
80(but not as efficiently) until the regex engine is fixed to be threadsafe.
722d2a37 82=head2 Work out exit/die semantics for threads
e50bb9a1 83
722d2a37 84=head2 Typed lexicals for compiler
e50bb9a1 85
722d2a37 86=head2 Compiler workarounds for Win32
e50bb9a1 87
722d2a37 88=head2 AUTOLOADing in the compiler
e50bb9a1 89
722d2a37 90=head2 Fixing comppadlist when compiling
e50bb9a1 91
722d2a37 92=head2 Cleaning up exported namespace
e50bb9a1 93
722d2a37 94=head2 Complete signal handling
e50bb9a1 95
96Add C<PERL_ASYNC_CHECK> to opcodes which loop; replace C<sigsetjmp> with
97C<sigjmp>; check C<wait> for signal safety.
e50bb9a1 98
722d2a37 99=head2 Out-of-source builds
e50bb9a1 100
722d2a37 101This was done for 5.6.0, but needs reworking for 5.7.x
e50bb9a1 102
722d2a37 103=head2 POSIX realtime support
e50bb9a1 104
105POSIX 1003.1 1996 Edition support--realtime stuff: POSIX semaphores,
106message queues, shared memory, realtime clocks, timers, signals (the
107metaconfig units mostly already exist for these)
e50bb9a1 108
722d2a37 109=head2 UNIX98 support
e50bb9a1 110
722d2a37 111Reader-writer locks, realtime/asynchronous IO
e50bb9a1 112
722d2a37 113=head2 IPv6 Support
e50bb9a1 114
115There are non-core modules, such as C<Net::IPv6>, but these will need
116integrating when IPv6 actually starts to really happen. See RFC 2292
117and RFC 2553.
e50bb9a1 118
722d2a37 119=head2 Long double conversion
e50bb9a1 120
722d2a37 121Floating point formatting is still causing some weird test failures.
e50bb9a1 122
722d2a37 123=head2 Locales
e50bb9a1 124
125Locales and Unicode interact with each other in unpleasant ways.
126One possible solution would be to adopt/support ICU:
e50bb9a1 127
722d2a37 128
e50bb9a1 129
722d2a37 130=head2 Thread-safe regexes
e50bb9a1 131
722d2a37 132The regular expression engine is currently non-threadsafe.
e50bb9a1 133
722d2a37 134=head2 Arithmetic on non-Arabic numerals
e50bb9a1 135
722d2a37 136C<[1234567890]> aren't the only numerals any more.
e50bb9a1 137
722d2a37 138=head2 POSIX Unicode character classes
e50bb9a1 139
140([=a=] for equivalance classes, [.ch.] for collation.)
141These are dependent on Unicode normalization and collation.
e50bb9a1 142
722d2a37 143=head2 Factoring out common suffices/prefices in regexps (trie optimization)
c47ff5f1 144
145Currently, the user has to optimize C<foo|far> and C<foo|goo> into
146C<f(?:oo|ar)> and C<[fg]oo> by hand; this could be done automatically.
e50bb9a1 147
722d2a37 148=head2 Security audit shipped utilities
e50bb9a1 149
150All the code we ship with Perl needs to be sensible about temporary file
151handling, locking, input validation, and so on.
e50bb9a1 152
722d2a37 153=head2 Custom opcodes
e50bb9a1 154
155Have a way to introduce user-defined opcodes without the subroutine call
156overhead of an XSUB; the user should be able to create PP code. Simon
157Cozens has some ideas on this.
e50bb9a1 158
722d2a37 159=head2 spawnvp() on Win32
e50bb9a1 160
161Win32 has problems spawning processes, particularly when the arguments
162to the child process contain spaces, quotes or tab characters.
e50bb9a1 163
722d2a37 164=head2 DLL Versioning
e50bb9a1 165
166Windows needs a way to know what version of a XS or C<libperl> DLL it's
e50bb9a1 168
722d2a37 169=head2 Introduce @( and @)
e50bb9a1 170
171C<$(> may return "foo bar baz". Unfortunately, since groups can
172theoretically have spaces in their names, this could be one, two or
173three groups.
e50bb9a1 174
722d2a37 175=head2 Floating point handling
e50bb9a1 176
177C<NaN> and C<inf> support is particularly troublesome.
178(fp_classify(), fp_class(), fp_class_d(), class(), isinf(),
179isfinite(), finite(), isnormal(), unordered(), <ieeefp.h>,
180<fp_class.h> (there are metaconfig units for all these) (I think),
181fp_setmask(), fp_getmask(), fp_setround(), fp_getround()
182(no metaconfig units yet for these). Don't forget finitel(), fp_classl(),
183fp_class_l(), (yes, both do, unfortunately, exist), and unorderedl().)
e50bb9a1 184
722d2a37 185As of Perl 5.6.1 is a Perl macro, Perl_isnan().
e50bb9a1 186
722d2a37 187=head2 IV/UV preservation
e50bb9a1 188
189Nicholas Clark has done a lot of work on this, but work is continuing.
190C<+>, C<-> and C<*> work, but guards need to be in place for C<%>, C</>,
191C<&>, C<oct>, C<hex> and C<pack>.
e50bb9a1 192
722d2a37 193=head2 Replace pod2html with something using Pod::Parser
83df6a1d 194
195The CPAN module C<Malik::Pod::Html> may be a more suitable basis for a
196C<pod2html> convertor; the current one duplicates the functionality
197abstracted in C<Pod::Parser>, which makes updating the POD language
e50bb9a1 199
722d2a37 200=head2 Automate module testing on CPAN
e50bb9a1 201
202When a new Perl is being beta tested, porters have to manually grab
203their favourite CPAN modules and test them - this should be done
e50bb9a1 205
722d2a37 206=head2 sendmsg and recvmsg
83df6a1d 207
208We have all the other BSD socket functions but these. There are
209metaconfig units for these functions which can be added. To avoid these
210being new opcodes, a solution similar to the way C<sockatmark> was added
211would be preferable. (Autoload the C<IO::whatever> module.)
e50bb9a1 212
722d2a37 213=head2 Rewrite perlre documentation
e50bb9a1 214
215The new-style patterns need full documentation, and the whole document
216needs to be a lot clearer.
e50bb9a1 217
722d2a37 218=head2 Convert example code to IO::Handle filehandles
e50bb9a1 219
722d2a37 220=head2 Document Win32 choices
e50bb9a1 221
722d2a37 222=head2 Check new modules
e50bb9a1 223
722d2a37 224=head2 Make roffitall find pods and libs itself
e50bb9a1 225
722d2a37 226Simon Cozens has done some work on this but it needs a rethink.
e50bb9a1 227
722d2a37 228=head1 To do at some point
e50bb9a1 229
230These are ideas that have been regularly tossed around, that most
231people believe should be done maybe during 5.8.x
e50bb9a1 232
722d2a37 233=head2 Remove regular expression recursion
e50bb9a1 234
235Because the regular expression engine is recursive, badly designed
236expressions can lead to lots of recursion filling up the stack. Ilya
237claims that it is easy to convert the engine to being iterative, but
238this has still not yet been done. There may be a regular expression
239engine hit squad meeting at TPC5.
e50bb9a1 240
722d2a37 241=head2 Memory leaks after failed eval
e50bb9a1 242
243Perl will leak memory if you C<eval "hlagh hlagh hlagh hlagh">. This is
244partially because it attempts to build up an op tree for that code and
245doesn't properly free it. The same goes for non-syntactically-correct
246regular expressions. Hugo looked into this, but decided it needed a
247mark-and-sweep GC implementation.
e50bb9a1 248
249Alan notes that: The basic idea was to extend the parser token stack
250(C<YYSTYPE>) to include a type field so we knew what sort of thing each
251element of the stack was. The F<<perly.c> code would then have to be
252postprocessed to record the type of each entry on the stack as it was
253created, and the parser patched so that it could unroll the stack
254properly on error.
e50bb9a1 255
256This is possible to do, but would be pretty messy to implement, as it
257would rely on even more sed hackery in F<perly.fixer>.
e50bb9a1 258
722d2a37 259=head2 pack "(stuff)*"
e50bb9a1 260
722d2a37 261That's to say, C<pack "(sI)40"> would be the same as C<pack "sI"x40>
e50bb9a1 262
722d2a37 263=head2 bitfields in pack
e50bb9a1 264
722d2a37 265=head2 Cross compilation
e50bb9a1 266
267Make Perl buildable with a cross-compiler. This will play havoc with
268Configure, which needs to how how the target system will respond to
269its tests; maybe C<microperl> will be a good starting point here.
270(Indeed, Bart Schuller reports that he compiled up C<microperl> for
271the Agenda PDA and it works fine.) A really big spanner in the works
272is the bootstrapping build process of Perl: if the filesystem the
273target systems sees is not the same what the build host sees, various
274input, output, and (Perl) library files need to be copied back and forth.
e50bb9a1 275
722d2a37 276=head2 Perl preprocessor / macros
e50bb9a1 277
278Source filters help with this, but do not get us all the way. For
279instance, it should be possible to implement the C<??> operator somehow;
280source filters don't (quite) cut it.
e50bb9a1 281
722d2a37 282=head2 Perl lexer in Perl
a45bd81d 283
722d2a37 284Damian Conway is planning to work on this, but it hasn't happened yet.
e50bb9a1 285
722d2a37 286=head2 Using POSIX calls internally
e50bb9a1 287
288When faced with a BSD vs. SySV -style interface to some library or
289system function, perl's roots show in that it typically prefers the BSD
290interface (but falls back to the SysV one). One example is getpgrp().
291Other examples include C<memcpy> vs. C<bcopy>. There are others, mostly in
e50bb9a1 293
294Mostly, this item is a suggestion for which way to start a journey into
295an C<#ifdef> forest. It is not primarily a suggestion to eliminate any of
296the C<#ifdef> forests.
e50bb9a1 297
298POSIX calls are perhaps more likely to be portable to unexpected
299architectures. They are also perhaps more likely to be actively
300maintained by a current vendor. They are also perhaps more likely to be
301available in thread-safe versions, if appropriate.
e50bb9a1 302
722d2a37 303=head2 -i rename file when changed
e50bb9a1 304
305It's only necessary to rename a file when inplace editing when the file
306has changed. Detecting a change is perhaps the difficult bit.
e50bb9a1 307
722d2a37 308=head2 All ARGV input should act like E<lt>E<gt>
e50bb9a1 309
722d2a37 310=head2 Support for rerunning debugger
e50bb9a1 311
722d2a37 312There should be a way of restarting the debugger on demand.
e50bb9a1 313
722d2a37 314=head2 my sub foo { }
c47ff5f1 315
316The basic principle is sound, but there are problems with the semantics
317of self-referential and mutually referential lexical subs: how to
318declare the subs?
c47ff5f1 319
722d2a37 320=head2 One-pass global destruction
c47ff5f1 321
322Sweeping away all the allocated memory in one go is a laudable goal, but
323it's difficult and in most cases, it's easier to let the memory get
324freed by exiting.
e50bb9a1 325
722d2a37 326=head2 Rewrite regexp parser
e50bb9a1 327
328There has been talk recently of rewriting the regular expression parser
329to produce an optree instead of a chain of opcodes; it's unclear whether
330or not this would be a win.
e50bb9a1 331
722d2a37 332=head2 Cache recently used regexps
e50bb9a1 333
722d2a37 334This is to speed up
e50bb9a1 335
336 for my $re (@regexps) {
337 $matched++ if /$re/
338 }
e50bb9a1 339
340C<qr//> already gives us a way of saving compiled regexps, but it should
341be done automatically.
e50bb9a1 342
722d2a37 343=head2 Re-entrant functions
e50bb9a1 344
345Add configure probes for C<_r> forms of system calls and fit them to the
346core. Unfortunately, calling conventions for these functions and not
04c70446 348
722d2a37 349=head2 Cross-compilation support
04c70446 350
351Bart Schuller reports that using C<microperl> and a cross-compiler, he
352got Perl working on the Agenda PDA. However, one cannot build a full
353Perl because Configure needs to get the results for the target platform,
354for the host.
e50bb9a1 355
722d2a37 356=head2 Bit-shifting bitvectors
e50bb9a1 357
722d2a37 358Given:
e50bb9a1 359
722d2a37 360 vec($v, 1000, 1) = 1;
e50bb9a1 361
722d2a37 362One should be able to do
e50bb9a1 363
722d2a37 364 $v <<= 1;
e50bb9a1 365
722d2a37 366and have the 999'th bit set.
e50bb9a1 367
368Currently if you try with shift bitvectors you shift the NV/UV, instead
369of the bits in the PV. Not very logical.
e50bb9a1 370
722d2a37 371=head2 debugger pragma
e50bb9a1 372
373The debugger is implemented in Perl in F<>; turning it into a
374pragma should be easy, but making it work lexically might be more
375difficult. Fiddling with C<$^P> would be necessary.
e50bb9a1 376
722d2a37 377=head2 use less pragma
e50bb9a1 378
379Identify areas where speed/memory tradeoffs can be made and have a hint
380to switch between them.
e50bb9a1 381
722d2a37 382=head2 switch structures
e50bb9a1 383
384Although we have C<> in core, Larry points to the dormant
385C<nswitch> and C<cswitch> ops in F<pp.c>; using these opcodes would be
386much faster.
e50bb9a1 387
722d2a37 388=head2 Cache eval tree
e50bb9a1 389
722d2a37 390=head2 rcatmaybe
e50bb9a1 391
722d2a37 392=head2 Shrink opcode tables
e50bb9a1 393
722d2a37 394=head2 Optimize away @_
e50bb9a1 395
722d2a37 396Look at the "reification" code in C<av.c>
e50bb9a1 397
722d2a37 398=head2 Prototypes versus indirect objects
e50bb9a1 399
722d2a37 400Currently, indirect object syntax bypasses prototype checks.
e50bb9a1 401
722d2a37 402=head2 Install HMTL
e50bb9a1 403
404HTML versions of the documentation need to be installed by default; a
405call to C<installhtml> from C<installperl> may be all that's necessary.
e50bb9a1 406
722d2a37 407=head2 Prototype method calls
e50bb9a1 408
722d2a37 409=head2 Return context prototype declarations
e50bb9a1 410
722d2a37 411=head2 magic_setisa
e50bb9a1 412
722d2a37 413=head2 Garbage collection
e50bb9a1 414
415There have been persistent mumblings about putting a mark-and-sweep
416garbage detector into Perl; Alan Burlison has some ideas about this.
e50bb9a1 417
722d2a37 418=head2 IO tutorial
e50bb9a1 419
722d2a37 420Mark-Jason Dominus has the beginnings of one of these.
e50bb9a1 421
722d2a37 422=head2 pack/unpack tutorial
e50bb9a1 423
722d2a37 424Simon Cozens has the beginnings of one of these.
e50bb9a1 425
722d2a37 426=head2 Rewrite perldoc
e50bb9a1 427
428There are a few suggestions for what to do with C<perldoc>: maybe a
429full-text search, an index function, locating pages on a particular
430high-level subject, and so on.
e50bb9a1 431
3958b146 432=head2 Install .3p manpages
e50bb9a1 433
3958b146 434This is a bone of contention; we can create C<.3p> manpages for each
435built-in function, but should we install them by default? Tcl does this,
436and it clutters up C<apropos>.
e50bb9a1 437
722d2a37 438=head2 Unicode tutorial
e50bb9a1 439
722d2a37 440Simon Cozens promises to do this before he gets old.
e50bb9a1 441
722d2a37 442=head2 Update for 1003.1-2
3958b146 443
722d2a37 444=head2 Retargetable installation
e50bb9a1 445
722d2a37 446Allow C<@INC> to be changed after Perl is built.
e50bb9a1 447
722d2a37 448=head2 POSIX emulation on non-POSIX systems
e50bb9a1 449
450Make C<> behave as POSIXly as possible everywhere, meaning we
451have to implement POSIX equivalents for some functions if necessary.
e50bb9a1 452
722d2a37 453=head2 Rename Win32 headers
e50bb9a1 454
455=head2 Finish off lvalue functions
457They don't work in the debugger, and they don't work for list or hash
e50bb9a1 459
722d2a37 460=head2 Update sprintf documentation
e50bb9a1 461
722d2a37 462Hugo van der Sanden plans to look at this.
e50bb9a1 463
722d2a37 464=head2 Use fchown/fchmod internally
e50bb9a1 465
466This has been done in places, but needs a thorough code review.
467Also fchdir is available in some platforms.
e50bb9a1 468
722d2a37 469=head1 Vague ideas
e50bb9a1 470
722d2a37 471Ideas which have been discussed, and which may or may not happen.
e50bb9a1 472
722d2a37 473=head2 ref() in list context
e50bb9a1 474
475It's unclear what this should do or how to do it without breaking old
e50bb9a1 477
722d2a37 478=head2 Make tr/// return histogram
e50bb9a1 479
722d2a37 480There is a patch for this, but it may require Unicodification.
e50bb9a1 481
722d2a37 482=head2 Compile to real threaded code
3958b146 483
722d2a37 484=head2 Structured types
3958b146 485
722d2a37 486=head2 Modifiable $1 et al.
e50bb9a1 487
488 ($x = "elephant") =~ /e(ph)/;
489 $1 = "g"; # $x = "elegant"
e50bb9a1 490
491What happens if there are multiple (nested?) brackets? What if the
492string changes between the match and the assignment?
e50bb9a1 493
722d2a37 494=head2 Procedural interfaces for IO::*, etc.
e50bb9a1 495
496Some core modules have been accused of being overly-OO. Adding
497procedural interfaces could demystify them.
e50bb9a1 498
722d2a37 499=head2 RPC modules
e50bb9a1 500
722d2a37 501=head2 Attach/detach debugger from running program
e50bb9a1 502
503With C<gdb>, you can attach the debugger to a running program if you
504pass the process ID. It would be good to do this with the Perl debugger
505on a running Perl program, although I'm not sure how it would be done.
e50bb9a1 506
722d2a37 507=head2 Alternative RE syntax module
e50bb9a1 508
509 use Regex::Newbie;
510 $re = Regex::Newbie->new
511 ->start
512 ->match("foo")
513 ->repeat(Regex::Newbie->class("char"),3)
514 ->end;
515 /$re/;
e50bb9a1 516
722d2a37 517=head2 GUI::Native
e50bb9a1 518
519A non-core module that would use "native" GUI to create graphical
e50bb9a1 521
722d2a37 522=head2 foreach(reverse ...)
e50bb9a1 523
722d2a37 524Currently
e50bb9a1 525
722d2a37 526 foreach (reverse @_) { ... }
e50bb9a1 527
528puts C<@_> on the stack, reverses it putting the reversed version on the
529stack, then iterates forwards. Instead, it could be special-cased to put
530C<@_> on the stack then iterate backwards.
e50bb9a1 531
722d2a37 532=head2 Constant function cache
e50bb9a1 533
722d2a37 534=head2 Approximate regular expression matching
e50bb9a1 535
722d2a37 536=head1 Ongoing
e50bb9a1 537
722d2a37 538These items B<always> need doing:
e50bb9a1 539
722d2a37 540=head2 Update guts documentation
e50bb9a1 541
542Simon Cozens tries to do this when possible, and contributions to the
543C<perlapi> documentation is welcome.
e50bb9a1 544
722d2a37 545=head2 Add more tests
e50bb9a1 546
547Michael Schwern will donate $500 to Yet Another Society when all core
548modules have tests.
e50bb9a1 549
722d2a37 550=head2 Update auxiliary tools
e50bb9a1 551
722d2a37 552The code we ship with Perl should look like good Perl 5.
e50bb9a1 553
722d2a37 554=head1 Recently done things
e50bb9a1 555
556These are things which have been on the todo lists in previous releases
557but have recently been completed.
e50bb9a1 558
722d2a37 559=head2 Safe signal handling
e50bb9a1 560
561A new signal model went into 5.7.1 without much fanfare. Operations and
562C<malloc>s are no longer interrupted by signals, which are handled
563between opcodes. This means that C<PERL_ASYNC_CHECK> now actually does
564something. However, there are still a few things that need to be done.
e50bb9a1 565
722d2a37 566=head2 Tie Modules
e50bb9a1 567
568Modules which implement arrays in terms of strings, substrings or files
569can be found on the CPAN.
e50bb9a1 570
722d2a37 571=head2 gettimeofday
e50bb9a1 572
722d2a37 573C<Time::Hires> has been integrated into the core.
e50bb9a1 574
722d2a37 575=head2 setitimer and getimiter
e50bb9a1 576
722d2a37 577Adding C<Time::Hires> got us this too.
e50bb9a1 578
579=head2 Testing __DIE__ hook
581Tests have been added.
583=head2 CPP equivalent in Perl
e50bb9a1 584
585A C Yardley will probably have done this by the time you can read this.
586This allows for a generalization of the C constant detection used in
587building C<>.
e50bb9a1 588
722d2a37 589=head2 Explicit switch statements
e50bb9a1 590
591C<> has been integrated into the core to give you all manner of
592C<> semantics.
e50bb9a1 593
722d2a37 594=head2 autocroak
e50bb9a1 595
722d2a37 596This is C<>.
e50bb9a1 597
722d2a37 598=head2 UTF/EBCDIC
e50bb9a1 599
722d2a37 600Nick Ing-Simmons has made UTF-EBCDIC (UTR13) work with Perl.
e50bb9a1 601
722d2a37 602 EBCDIC?
e50bb9a1 603
722d2a37 604=head2 UTF Regexes
e50bb9a1 605
606Although there are probably some small bugs to be rooted out, Jarkko
607Hietaniemi has made regular expressions polymorphic between bytes and
e50bb9a1 609
722d2a37 610=head2 perlcc to produce executable
e50bb9a1 611
612C<perlcc> was recently rewritten, and can now produce standalone
e50bb9a1 614
722d2a37 615=head2 END blocks saved in compiled output
e50bb9a1 616
722d2a37 617=head2 Secure temporary file module
e50bb9a1 618
722d2a37 619Tim Jenness' C<File::Temp> is now in core.
e50bb9a1 620
722d2a37 621=head2 Integrate Time::HiRes
e50bb9a1 622
722d2a37 623This module is now part of core.
e50bb9a1 624
722d2a37 625=head2 Turn Cwd into XS
e50bb9a1 626
722d2a37 627Benjamin Sugars has done this.
e50bb9a1 628
722d2a37 629=head2 Mmap for input
e50bb9a1 630
722d2a37 631Nick Ing-Simmons' C<perlio> supports an C<mmap> IO method.
e50bb9a1 632
722d2a37 633=head2 Byte to/from UTF8 and UTF8 to/from local conversion
e50bb9a1 634
722d2a37 635C<Encode> provides this.
e50bb9a1 636
722d2a37 637=head2 Add sockatmark support
e50bb9a1 638
722d2a37 639Added in 5.7.1
e50bb9a1 640
641=head2 Mailing list archives
645=head2 Bug tracking
647Richard Foley has written the bug tracking system at
e50bb9a1 648
722d2a37 649=head2 Integrate MacPerl
e50bb9a1 650
651Chris Nandor and Matthias Neeracher have integrated the MacPerl changes
652into 5.6.0.
e50bb9a1 653
722d2a37 654=head2 Web "nerve center" for Perl
e50bb9a1 655
722d2a37 656 is what you're looking for.
e50bb9a1 657
722d2a37 658=head2 Regular expression tutorial
e50bb9a1 659
722d2a37 660C<perlretut>, provided by Mark Kvale.
e50bb9a1 661
722d2a37 662=head2 Debugging Tutorial
e50bb9a1 663
722d2a37 664C<perldebtut>, written by Richard Foley.
e50bb9a1 665
722d2a37 666=head2 Integrate new modules
e50bb9a1 667
722d2a37 668Jarkko has been integrating madly into 5.7.x
e50bb9a1 669
722d2a37 670=head2 Integrate profiler
e50bb9a1 671
722d2a37 672C<Devel::DProf> is now a core module.
e50bb9a1 673
722d2a37 674=head2 Y2K error detection
e50bb9a1 675
676There's a configure option to detect unsafe concatenation with "19", and
677a CPAN module. (C<D'oh::Year>)
e50bb9a1 678
722d2a37 679=head2 Regular expression debugger
e50bb9a1 680
681While not part of core, Mark-Jason Dominus has written C<Rx> and has
682also come up with a generalised strategy for regular expression
e50bb9a1 684
722d2a37 685=head2 POD checker
e50bb9a1 686
722d2a37 687That's, uh, F<podchecker>
e50bb9a1 688
722d2a37 689=head2 "Dynamic" lexicals
e50bb9a1 690
722d2a37 691=head2 Cache precompiled modules
e50bb9a1 692
722d2a37 693=head1 Deprecated Wishes
e50bb9a1 694
695These are items which used to be in the todo file, but have been
696deprecated for some reason.
e50bb9a1 697
722d2a37 698=head2 Loop control on do{}
e50bb9a1 699
722d2a37 700This would break old code; use C<do{{ }}> instead.
e50bb9a1 701
722d2a37 702=head2 Lexically scoped typeglobs
e50bb9a1 703
722d2a37 704Not needed now we have lexical IO handles.
e50bb9a1 705
722d2a37 706=head2 format BOTTOM
3958b146 707
722d2a37 708=head2 report HANDLE
e50bb9a1 709
722d2a37 710Damian Conway's text formatting modules seem to be the Way To Go.
e50bb9a1 711
722d2a37 712=head2 Generalised want()/caller())
3958b146 713
722d2a37 714=head2 Named prototypes
e50bb9a1 715
722d2a37 716These both seem to be delayed until Perl 6.
e50bb9a1 717
722d2a37 718=head2 Built-in globbing
e50bb9a1 719
722d2a37 720The C<File::Glob> module has been used to replace the C<glob> function.
e50bb9a1 721
722d2a37 722=head2 Regression tests for suidperl
e50bb9a1 723
722d2a37 724C<suidperl> is deprecated in favour of common sense.
e50bb9a1 725
722d2a37 726=head2 Cached hash values
e50bb9a1 727
722d2a37 728We have shared hash keys, which perform the same job.
e50bb9a1 729
722d2a37 730=head2 Add compression modules
e50bb9a1 731
732The compression modules are a little heavy; meanwhile, Nick Clark is
733working on experimental pragmata to do transparent decompression on
e50bb9a1 735
722d2a37 736=head2 Reorganise documentation into tutorials/references
e50bb9a1 737
722d2a37 738Could not get consensus on P5P about this.
e50bb9a1 739
740=head2 Remove distinction between functions and operators
742Caution: highly flammable.
744=head2 Make XS easier to use
e50bb9a1 745
722d2a37 746Use C<Inline> instead, or SWIG.
e50bb9a1 747
722d2a37 748=head2 Make embedding easier to use
e50bb9a1 749
722d2a37 750Use C<Inline::CPR>.
e50bb9a1 751
722d2a37 752=head2 man for perl
04c70446 753
722d2a37 754See the Perl Power Tools. (
04c70446 755
722d2a37 756=head2 my $Package::variable
04c70446 757
722d2a37 758Use C<our> instead.
04c70446 759
722d2a37 760=head2 "or" tests defined, not truth
04c70446 761
722d2a37 762Suggesting this on P5P B<will> cause a boring and interminable flamewar.
04c70446 763
722d2a37 764=head2 "class"-based lexicals
04c70446 765
cbb3fa72 766Use flyweight objects, secure hashes or, dare I say it, pseudo-hashes instead.
04c70446 767
722d2a37 768=head2 byteperl
04c70446 769
722d2a37 770C<ByteLoader> covers this.
04c70446 771
722d2a37 772=head2 Lazy evaluation / tail recursion removal
04c70446 773
774C<List::Util> in core gives some of these; tail recursion removal is
775done manually, with C<goto &whoami;>. (However, MJD has found that
776C<goto &whoami> introduces a performance penalty, so maybe there should
777be a way to do this after all: C<sub foo {START: ... goto START;> is
780=head2 Make "use utf8" the default
782There is a patch available for this, search p5p archives for
783the Subject "[EXPERIMENTAL PATCH] make unicode (utf8) default"
784but this would be unacceptable because of backward compatibility:
785scripts could not contain B<any legacy eight-bit data>. Also would
786introduce a measurable slowdown of at least few percentages since all
787regular expression operations would be done in full UTF-8.