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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
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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
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20C<perlio> provides this, but the interface could be a lot more
21straightforward.
e50bb9a1 22
4b3b956a 23=head2 Autoload bytes.pm
e50bb9a1 24
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25When the lexer sees, for instance, C<bytes::length>, it should
26automatically load the C<bytes> pragma.
27
28=head2 Make "\u{XXXX}" et al work
29
30Danger, Will Robinson! Discussing the semantics of C<"\x{F00}">,
31C<"\xF00"> and C<"\U{F00}"> on P5P I<will> lead to a long and boring
32flamewar.
e50bb9a1 33
c6287c21 34=head2 Create a char *sv_pvprintify(sv, STRLEN *lenp, UV flags)
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35
36For displaying PVs with control characters, embedded nulls, and Unicode.
37This would be useful for printing warnings, or data and regex dumping,
38not_a_number(), and so on.
39
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40Requirements: should handle both byte and UTF8 strings. isPRINT()
41characters printed as-is, character less than 256 as \xHH, Unicode
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42characters as \x{HHH}. Don't assume ASCII-like, either, get somebody
43on EBCDIC to test the output.
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44
45Possible options, controlled by the flags:
0661e9a4 46- whitespace (other than ' ' of isPRINT()) printed as-is
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47- use isPRINT_LC() instead of isPRINT()
48- print control characters like this: "\cA"
49- print control characters like this: "^A"
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50- non-PRINTables printed as '.' instead of \xHH
51- use \OOO instead of \xHH
52- use the C/Perl-metacharacters like \n, \t
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53- have a maximum length for the produced string (read it from *lenp)
54- append a "..." to the produced string if the maximum length is exceeded
0661e9a4 55- really fancy: print unicode characters as \N{...}
f35392ae 56
722d2a37 57=head2 Overloadable regex assertions
e50bb9a1 58
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59This may or may not be possible with the current regular expression
60engine. The idea is that, for instance, C<\b> needs to be
61algorithmically computed if you're dealing with Thai text. Hence, the
62B<\b> assertion wants to be overloaded by a function.
e50bb9a1 63
722d2a37 64=head2 Unicode collation and normalization
e50bb9a1 65
722d2a37 66Simon Cozens promises to work on this.
e50bb9a1 67
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68 Collation? http://www.unicode.org/unicode/reports/tr10/
69 Normalization? http://www.unicode.org/unicode/reports/tr15/
e50bb9a1 70
722d2a37 71=head2 Unicode case mappings
e50bb9a1 72
722d2a37 73 Case Mappings? http://www.unicode.org/unicode/reports/tr21/
e50bb9a1 74
722d2a37 75=head2 Unicode regular expression character classes
e50bb9a1 76
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77They have some tricks Perl doesn't yet implement like character
78class subtraction.
e50bb9a1 79
722d2a37 80 http://www.unicode.org/unicode/reports/tr18/
e50bb9a1 81
722d2a37 82=head2 use Thread for iThreads
e50bb9a1 83
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84Artur Bergman's C<iThreads> module is a start on this, but needs to
85be more mature.
e50bb9a1 86
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87=head2 make perl_clone optionally clone ops
88
89So that pseudoforking, mod_perl, iThreads and nvi will work properly
90(but not as efficiently) until the regex engine is fixed to be threadsafe.
91
722d2a37 92=head2 Work out exit/die semantics for threads
e50bb9a1 93
722d2a37 94=head2 Typed lexicals for compiler
e50bb9a1 95
722d2a37 96=head2 Compiler workarounds for Win32
e50bb9a1 97
722d2a37 98=head2 AUTOLOADing in the compiler
e50bb9a1 99
722d2a37 100=head2 Fixing comppadlist when compiling
e50bb9a1 101
722d2a37 102=head2 Cleaning up exported namespace
e50bb9a1 103
722d2a37 104=head2 Complete signal handling
e50bb9a1 105
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106Add C<PERL_ASYNC_CHECK> to opcodes which loop; replace C<sigsetjmp> with
107C<sigjmp>; check C<wait> for signal safety.
e50bb9a1 108
722d2a37 109=head2 Out-of-source builds
e50bb9a1 110
722d2a37 111This was done for 5.6.0, but needs reworking for 5.7.x
e50bb9a1 112
722d2a37 113=head2 POSIX realtime support
e50bb9a1 114
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115POSIX 1003.1 1996 Edition support--realtime stuff: POSIX semaphores,
116message queues, shared memory, realtime clocks, timers, signals (the
117metaconfig units mostly already exist for these)
e50bb9a1 118
722d2a37 119=head2 UNIX98 support
e50bb9a1 120
722d2a37 121Reader-writer locks, realtime/asynchronous IO
e50bb9a1 122
722d2a37 123=head2 IPv6 Support
e50bb9a1 124
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125There are non-core modules, such as C<Net::IPv6>, but these will need
126integrating when IPv6 actually starts to really happen. See RFC 2292
127and RFC 2553.
e50bb9a1 128
722d2a37 129=head2 Long double conversion
e50bb9a1 130
722d2a37 131Floating point formatting is still causing some weird test failures.
e50bb9a1 132
722d2a37 133=head2 Locales
e50bb9a1 134
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135Locales and Unicode interact with each other in unpleasant ways.
136One possible solution would be to adopt/support ICU:
e50bb9a1 137
722d2a37 138 http://oss.software.ibm.com/developerworks/opensource/icu/project/
e50bb9a1 139
722d2a37 140=head2 Thread-safe regexes
e50bb9a1 141
722d2a37 142The regular expression engine is currently non-threadsafe.
e50bb9a1 143
722d2a37 144=head2 Arithmetic on non-Arabic numerals
e50bb9a1 145
722d2a37 146C<[1234567890]> aren't the only numerals any more.
e50bb9a1 147
722d2a37 148=head2 POSIX Unicode character classes
e50bb9a1 149
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150([=a=] for equivalance classes, [.ch.] for collation.)
151These are dependent on Unicode normalization and collation.
e50bb9a1 152
722d2a37 153=head2 Factoring out common suffices/prefices in regexps (trie optimization)
c47ff5f1 154
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155Currently, the user has to optimize C<foo|far> and C<foo|goo> into
156C<f(?:oo|ar)> and C<[fg]oo> by hand; this could be done automatically.
e50bb9a1 157
722d2a37 158=head2 Security audit shipped utilities
e50bb9a1 159
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160All the code we ship with Perl needs to be sensible about temporary file
161handling, locking, input validation, and so on.
e50bb9a1 162
722d2a37 163=head2 Custom opcodes
e50bb9a1 164
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165Have a way to introduce user-defined opcodes without the subroutine call
166overhead of an XSUB; the user should be able to create PP code. Simon
167Cozens has some ideas on this.
e50bb9a1 168
722d2a37 169=head2 spawnvp() on Win32
e50bb9a1 170
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171Win32 has problems spawning processes, particularly when the arguments
172to the child process contain spaces, quotes or tab characters.
e50bb9a1 173
722d2a37 174=head2 DLL Versioning
e50bb9a1 175
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176Windows needs a way to know what version of a XS or C<libperl> DLL it's
177loading.
e50bb9a1 178
722d2a37 179=head2 Introduce @( and @)
e50bb9a1 180
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181C<$(> may return "foo bar baz". Unfortunately, since groups can
182theoretically have spaces in their names, this could be one, two or
183three groups.
e50bb9a1 184
722d2a37 185=head2 Floating point handling
e50bb9a1 186
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187C<NaN> and C<inf> support is particularly troublesome.
188(fp_classify(), fp_class(), fp_class_d(), class(), isinf(),
189isfinite(), finite(), isnormal(), unordered(), <ieeefp.h>,
190<fp_class.h> (there are metaconfig units for all these) (I think),
191fp_setmask(), fp_getmask(), fp_setround(), fp_getround()
192(no metaconfig units yet for these). Don't forget finitel(), fp_classl(),
193fp_class_l(), (yes, both do, unfortunately, exist), and unorderedl().)
e50bb9a1 194
722d2a37 195As of Perl 5.6.1 is a Perl macro, Perl_isnan().
e50bb9a1 196
722d2a37 197=head2 IV/UV preservation
e50bb9a1 198
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199Nicholas Clark has done a lot of work on this, but work is continuing.
200C<+>, C<-> and C<*> work, but guards need to be in place for C<%>, C</>,
201C<&>, C<oct>, C<hex> and C<pack>.
e50bb9a1 202
722d2a37 203=head2 Replace pod2html with something using Pod::Parser
83df6a1d 204
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205The CPAN module C<Malik::Pod::Html> may be a more suitable basis for a
206C<pod2html> convertor; the current one duplicates the functionality
207abstracted in C<Pod::Parser>, which makes updating the POD language
208difficult.
e50bb9a1 209
722d2a37 210=head2 Automate module testing on CPAN
e50bb9a1 211
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212When a new Perl is being beta tested, porters have to manually grab
213their favourite CPAN modules and test them - this should be done
214automatically.
e50bb9a1 215
722d2a37 216=head2 sendmsg and recvmsg
83df6a1d 217
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218We have all the other BSD socket functions but these. There are
219metaconfig units for these functions which can be added. To avoid these
220being new opcodes, a solution similar to the way C<sockatmark> was added
221would be preferable. (Autoload the C<IO::whatever> module.)
e50bb9a1 222
722d2a37 223=head2 Rewrite perlre documentation
e50bb9a1 224
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225The new-style patterns need full documentation, and the whole document
226needs to be a lot clearer.
e50bb9a1 227
722d2a37 228=head2 Convert example code to IO::Handle filehandles
e50bb9a1 229
722d2a37 230=head2 Document Win32 choices
e50bb9a1 231
722d2a37 232=head2 Check new modules
e50bb9a1 233
722d2a37 234=head2 Make roffitall find pods and libs itself
e50bb9a1 235
722d2a37 236Simon Cozens has done some work on this but it needs a rethink.
e50bb9a1 237
722d2a37 238=head1 To do at some point
e50bb9a1 239
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240These are ideas that have been regularly tossed around, that most
241people believe should be done maybe during 5.8.x
e50bb9a1 242
722d2a37 243=head2 Remove regular expression recursion
e50bb9a1 244
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245Because the regular expression engine is recursive, badly designed
246expressions can lead to lots of recursion filling up the stack. Ilya
247claims that it is easy to convert the engine to being iterative, but
248this has still not yet been done. There may be a regular expression
249engine hit squad meeting at TPC5.
e50bb9a1 250
722d2a37 251=head2 Memory leaks after failed eval
e50bb9a1 252
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253Perl will leak memory if you C<eval "hlagh hlagh hlagh hlagh">. This is
254partially because it attempts to build up an op tree for that code and
255doesn't properly free it. The same goes for non-syntactically-correct
256regular expressions. Hugo looked into this, but decided it needed a
257mark-and-sweep GC implementation.
e50bb9a1 258
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259Alan notes that: The basic idea was to extend the parser token stack
260(C<YYSTYPE>) to include a type field so we knew what sort of thing each
261element of the stack was. The F<<perly.c> code would then have to be
262postprocessed to record the type of each entry on the stack as it was
263created, and the parser patched so that it could unroll the stack
264properly on error.
e50bb9a1 265
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266This is possible to do, but would be pretty messy to implement, as it
267would rely on even more sed hackery in F<perly.fixer>.
e50bb9a1 268
722d2a37 269=head2 pack "(stuff)*"
e50bb9a1 270
722d2a37 271That's to say, C<pack "(sI)40"> would be the same as C<pack "sI"x40>
e50bb9a1 272
722d2a37 273=head2 bitfields in pack
e50bb9a1 274
722d2a37 275=head2 Cross compilation
e50bb9a1 276
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277Make Perl buildable with a cross-compiler. This will play havoc with
278Configure, which needs to how how the target system will respond to
279its tests; maybe C<microperl> will be a good starting point here.
280(Indeed, Bart Schuller reports that he compiled up C<microperl> for
281the Agenda PDA and it works fine.) A really big spanner in the works
282is the bootstrapping build process of Perl: if the filesystem the
283target systems sees is not the same what the build host sees, various
284input, output, and (Perl) library files need to be copied back and forth.
e50bb9a1 285
722d2a37 286=head2 Perl preprocessor / macros
e50bb9a1 287
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288Source filters help with this, but do not get us all the way. For
289instance, it should be possible to implement the C<??> operator somehow;
290source filters don't (quite) cut it.
e50bb9a1 291
722d2a37 292=head2 Perl lexer in Perl
a45bd81d 293
722d2a37 294Damian Conway is planning to work on this, but it hasn't happened yet.
e50bb9a1 295
722d2a37 296=head2 Using POSIX calls internally
e50bb9a1 297
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298When faced with a BSD vs. SySV -style interface to some library or
299system function, perl's roots show in that it typically prefers the BSD
300interface (but falls back to the SysV one). One example is getpgrp().
301Other examples include C<memcpy> vs. C<bcopy>. There are others, mostly in
302F<<pp_sys.c>.
e50bb9a1 303
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304Mostly, this item is a suggestion for which way to start a journey into
305an C<#ifdef> forest. It is not primarily a suggestion to eliminate any of
306the C<#ifdef> forests.
e50bb9a1 307
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308POSIX calls are perhaps more likely to be portable to unexpected
309architectures. They are also perhaps more likely to be actively
310maintained by a current vendor. They are also perhaps more likely to be
311available in thread-safe versions, if appropriate.
e50bb9a1 312
722d2a37 313=head2 -i rename file when changed
e50bb9a1 314
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315It's only necessary to rename a file when inplace editing when the file
316has changed. Detecting a change is perhaps the difficult bit.
e50bb9a1 317
722d2a37 318=head2 All ARGV input should act like E<lt>E<gt>
e50bb9a1 319
722d2a37 320=head2 Support for rerunning debugger
e50bb9a1 321
722d2a37 322There should be a way of restarting the debugger on demand.
e50bb9a1 323
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324=head2 Test Suite for the Debugger
325
326The debugger is a complex piece of software and fixing something
327here may inadvertently break something else over there. To tame
328this chaotic behaviour, a test suite is necessary.
329
722d2a37 330=head2 my sub foo { }
c47ff5f1 331
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332The basic principle is sound, but there are problems with the semantics
333of self-referential and mutually referential lexical subs: how to
334declare the subs?
c47ff5f1 335
722d2a37 336=head2 One-pass global destruction
c47ff5f1 337
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338Sweeping away all the allocated memory in one go is a laudable goal, but
339it's difficult and in most cases, it's easier to let the memory get
340freed by exiting.
e50bb9a1 341
722d2a37 342=head2 Rewrite regexp parser
e50bb9a1 343
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344There has been talk recently of rewriting the regular expression parser
345to produce an optree instead of a chain of opcodes; it's unclear whether
346or not this would be a win.
e50bb9a1 347
722d2a37 348=head2 Cache recently used regexps
e50bb9a1 349
722d2a37 350This is to speed up
e50bb9a1 351
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352 for my $re (@regexps) {
353 $matched++ if /$re/
354 }
e50bb9a1 355
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356C<qr//> already gives us a way of saving compiled regexps, but it should
357be done automatically.
e50bb9a1 358
722d2a37 359=head2 Re-entrant functions
e50bb9a1 360
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361Add configure probes for C<_r> forms of system calls and fit them to the
362core. Unfortunately, calling conventions for these functions and not
363standardised.
04c70446 364
722d2a37 365=head2 Cross-compilation support
04c70446 366
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367Bart Schuller reports that using C<microperl> and a cross-compiler, he
368got Perl working on the Agenda PDA. However, one cannot build a full
369Perl because Configure needs to get the results for the target platform,
370for the host.
e50bb9a1 371
722d2a37 372=head2 Bit-shifting bitvectors
e50bb9a1 373
722d2a37 374Given:
e50bb9a1 375
722d2a37 376 vec($v, 1000, 1) = 1;
e50bb9a1 377
722d2a37 378One should be able to do
e50bb9a1 379
722d2a37 380 $v <<= 1;
e50bb9a1 381
722d2a37 382and have the 999'th bit set.
e50bb9a1 383
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384Currently if you try with shift bitvectors you shift the NV/UV, instead
385of the bits in the PV. Not very logical.
e50bb9a1 386
722d2a37 387=head2 debugger pragma
e50bb9a1 388
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389The debugger is implemented in Perl in F<perl5db.pl>; turning it into a
390pragma should be easy, but making it work lexically might be more
391difficult. Fiddling with C<$^P> would be necessary.
e50bb9a1 392
722d2a37 393=head2 use less pragma
e50bb9a1 394
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395Identify areas where speed/memory tradeoffs can be made and have a hint
396to switch between them.
e50bb9a1 397
722d2a37 398=head2 switch structures
e50bb9a1 399
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400Although we have C<Switch.pm> in core, Larry points to the dormant
401C<nswitch> and C<cswitch> ops in F<pp.c>; using these opcodes would be
402much faster.
e50bb9a1 403
722d2a37 404=head2 Cache eval tree
e50bb9a1 405
722d2a37 406=head2 rcatmaybe
e50bb9a1 407
722d2a37 408=head2 Shrink opcode tables
e50bb9a1 409
722d2a37 410=head2 Optimize away @_
e50bb9a1 411
722d2a37 412Look at the "reification" code in C<av.c>
e50bb9a1 413
722d2a37 414=head2 Prototypes versus indirect objects
e50bb9a1 415
722d2a37 416Currently, indirect object syntax bypasses prototype checks.
e50bb9a1 417
722d2a37 418=head2 Install HMTL
e50bb9a1 419
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420HTML versions of the documentation need to be installed by default; a
421call to C<installhtml> from C<installperl> may be all that's necessary.
e50bb9a1 422
722d2a37 423=head2 Prototype method calls
e50bb9a1 424
722d2a37 425=head2 Return context prototype declarations
e50bb9a1 426
722d2a37 427=head2 magic_setisa
e50bb9a1 428
722d2a37 429=head2 Garbage collection
e50bb9a1 430
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431There have been persistent mumblings about putting a mark-and-sweep
432garbage detector into Perl; Alan Burlison has some ideas about this.
e50bb9a1 433
722d2a37 434=head2 IO tutorial
e50bb9a1 435
722d2a37 436Mark-Jason Dominus has the beginnings of one of these.
e50bb9a1 437
722d2a37 438=head2 pack/unpack tutorial
e50bb9a1 439
722d2a37 440Simon Cozens has the beginnings of one of these.
e50bb9a1 441
722d2a37 442=head2 Rewrite perldoc
e50bb9a1 443
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444There are a few suggestions for what to do with C<perldoc>: maybe a
445full-text search, an index function, locating pages on a particular
446high-level subject, and so on.
e50bb9a1 447
3958b146 448=head2 Install .3p manpages
e50bb9a1 449
3958b146 450This is a bone of contention; we can create C<.3p> manpages for each
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451built-in function, but should we install them by default? Tcl does this,
452and it clutters up C<apropos>.
e50bb9a1 453
722d2a37 454=head2 Unicode tutorial
e50bb9a1 455
722d2a37 456Simon Cozens promises to do this before he gets old.
e50bb9a1 457
722d2a37 458=head2 Update POSIX.pm for 1003.1-2
3958b146 459
722d2a37 460=head2 Retargetable installation
e50bb9a1 461
722d2a37 462Allow C<@INC> to be changed after Perl is built.
e50bb9a1 463
722d2a37 464=head2 POSIX emulation on non-POSIX systems
e50bb9a1 465
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466Make C<POSIX.pm> behave as POSIXly as possible everywhere, meaning we
467have to implement POSIX equivalents for some functions if necessary.
e50bb9a1 468
722d2a37 469=head2 Rename Win32 headers
e50bb9a1 470
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471=head2 Finish off lvalue functions
472
473They don't work in the debugger, and they don't work for list or hash
474slices.
e50bb9a1 475
722d2a37 476=head2 Update sprintf documentation
e50bb9a1 477
722d2a37 478Hugo van der Sanden plans to look at this.
e50bb9a1 479
722d2a37 480=head2 Use fchown/fchmod internally
e50bb9a1 481
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482This has been done in places, but needs a thorough code review.
483Also fchdir is available in some platforms.
e50bb9a1 484
722d2a37 485=head1 Vague ideas
e50bb9a1 486
722d2a37 487Ideas which have been discussed, and which may or may not happen.
e50bb9a1 488
722d2a37 489=head2 ref() in list context
e50bb9a1 490
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491It's unclear what this should do or how to do it without breaking old
492code.
e50bb9a1 493
722d2a37 494=head2 Make tr/// return histogram
e50bb9a1 495
722d2a37 496There is a patch for this, but it may require Unicodification.
e50bb9a1 497
722d2a37 498=head2 Compile to real threaded code
3958b146 499
722d2a37 500=head2 Structured types
3958b146 501
722d2a37 502=head2 Modifiable $1 et al.
e50bb9a1 503
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504 ($x = "elephant") =~ /e(ph)/;
505 $1 = "g"; # $x = "elegant"
e50bb9a1 506
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507What happens if there are multiple (nested?) brackets? What if the
508string changes between the match and the assignment?
e50bb9a1 509
722d2a37 510=head2 Procedural interfaces for IO::*, etc.
e50bb9a1 511
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512Some core modules have been accused of being overly-OO. Adding
513procedural interfaces could demystify them.
e50bb9a1 514
722d2a37 515=head2 RPC modules
e50bb9a1 516
722d2a37 517=head2 Attach/detach debugger from running program
e50bb9a1 518
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519With C<gdb>, you can attach the debugger to a running program if you
520pass the process ID. It would be good to do this with the Perl debugger
521on a running Perl program, although I'm not sure how it would be done.
e50bb9a1 522
722d2a37 523=head2 Alternative RE syntax module
e50bb9a1 524
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525 use Regex::Newbie;
526 $re = Regex::Newbie->new
527 ->start
528 ->match("foo")
529 ->repeat(Regex::Newbie->class("char"),3)
530 ->end;
531 /$re/;
e50bb9a1 532
722d2a37 533=head2 GUI::Native
e50bb9a1 534
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535A non-core module that would use "native" GUI to create graphical
536applications.
e50bb9a1 537
722d2a37 538=head2 foreach(reverse ...)
e50bb9a1 539
722d2a37 540Currently
e50bb9a1 541
722d2a37 542 foreach (reverse @_) { ... }
e50bb9a1 543
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544puts C<@_> on the stack, reverses it putting the reversed version on the
545stack, then iterates forwards. Instead, it could be special-cased to put
546C<@_> on the stack then iterate backwards.
e50bb9a1 547
722d2a37 548=head2 Constant function cache
e50bb9a1 549
722d2a37 550=head2 Approximate regular expression matching
e50bb9a1 551
722d2a37 552=head1 Ongoing
e50bb9a1 553
722d2a37 554These items B<always> need doing:
e50bb9a1 555
722d2a37 556=head2 Update guts documentation
e50bb9a1 557
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558Simon Cozens tries to do this when possible, and contributions to the
559C<perlapi> documentation is welcome.
e50bb9a1 560
722d2a37 561=head2 Add more tests
e50bb9a1 562
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563Michael Schwern will donate $500 to Yet Another Society when all core
564modules have tests.
e50bb9a1 565
722d2a37 566=head2 Update auxiliary tools
e50bb9a1 567
722d2a37 568The code we ship with Perl should look like good Perl 5.
e50bb9a1 569
722d2a37 570=head1 Recently done things
e50bb9a1 571
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572These are things which have been on the todo lists in previous releases
573but have recently been completed.
e50bb9a1 574
722d2a37 575=head2 Safe signal handling
e50bb9a1 576
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577A new signal model went into 5.7.1 without much fanfare. Operations and
578C<malloc>s are no longer interrupted by signals, which are handled
579between opcodes. This means that C<PERL_ASYNC_CHECK> now actually does
580something. However, there are still a few things that need to be done.
e50bb9a1 581
722d2a37 582=head2 Tie Modules
e50bb9a1 583
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584Modules which implement arrays in terms of strings, substrings or files
585can be found on the CPAN.
e50bb9a1 586
722d2a37 587=head2 gettimeofday
e50bb9a1 588
722d2a37 589C<Time::Hires> has been integrated into the core.
e50bb9a1 590
722d2a37 591=head2 setitimer and getimiter
e50bb9a1 592
722d2a37 593Adding C<Time::Hires> got us this too.
e50bb9a1 594
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595=head2 Testing __DIE__ hook
596
597Tests have been added.
598
599=head2 CPP equivalent in Perl
e50bb9a1 600
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601A C Yardley will probably have done this by the time you can read this.
602This allows for a generalization of the C constant detection used in
603building C<Errno.pm>.
e50bb9a1 604
722d2a37 605=head2 Explicit switch statements
e50bb9a1 606
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607C<Switch.pm> has been integrated into the core to give you all manner of
608C<switch...case> semantics.
e50bb9a1 609
722d2a37 610=head2 autocroak
e50bb9a1 611
722d2a37 612This is C<Fatal.pm>.
e50bb9a1 613
722d2a37 614=head2 UTF/EBCDIC
e50bb9a1 615
722d2a37 616Nick Ing-Simmons has made UTF-EBCDIC (UTR13) work with Perl.
e50bb9a1 617
722d2a37 618 EBCDIC? http://www.unicode.org/unicode/reports/tr16/
e50bb9a1 619
722d2a37 620=head2 UTF Regexes
e50bb9a1 621
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622Although there are probably some small bugs to be rooted out, Jarkko
623Hietaniemi has made regular expressions polymorphic between bytes and
624characters.
e50bb9a1 625
722d2a37 626=head2 perlcc to produce executable
e50bb9a1 627
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628C<perlcc> was recently rewritten, and can now produce standalone
629executables.
e50bb9a1 630
722d2a37 631=head2 END blocks saved in compiled output
e50bb9a1 632
722d2a37 633=head2 Secure temporary file module
e50bb9a1 634
722d2a37 635Tim Jenness' C<File::Temp> is now in core.
e50bb9a1 636
722d2a37 637=head2 Integrate Time::HiRes
e50bb9a1 638
722d2a37 639This module is now part of core.
e50bb9a1 640
722d2a37 641=head2 Turn Cwd into XS
e50bb9a1 642
722d2a37 643Benjamin Sugars has done this.
e50bb9a1 644
722d2a37 645=head2 Mmap for input
e50bb9a1 646
722d2a37 647Nick Ing-Simmons' C<perlio> supports an C<mmap> IO method.
e50bb9a1 648
722d2a37 649=head2 Byte to/from UTF8 and UTF8 to/from local conversion
e50bb9a1 650
722d2a37 651C<Encode> provides this.
e50bb9a1 652
722d2a37 653=head2 Add sockatmark support
e50bb9a1 654
722d2a37 655Added in 5.7.1
e50bb9a1 656
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657=head2 Mailing list archives
658
659http://lists.perl.org/, http://archive.develooper.com/
660
661=head2 Bug tracking
662
663Richard Foley has written the bug tracking system at http://bugs.perl.org/
e50bb9a1 664
722d2a37 665=head2 Integrate MacPerl
e50bb9a1 666
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667Chris Nandor and Matthias Neeracher have integrated the MacPerl changes
668into 5.6.0.
e50bb9a1 669
722d2a37 670=head2 Web "nerve center" for Perl
e50bb9a1 671
722d2a37 672http://use.perl.org/ is what you're looking for.
e50bb9a1 673
722d2a37 674=head2 Regular expression tutorial
e50bb9a1 675
722d2a37 676C<perlretut>, provided by Mark Kvale.
e50bb9a1 677
722d2a37 678=head2 Debugging Tutorial
e50bb9a1 679
722d2a37 680C<perldebtut>, written by Richard Foley.
e50bb9a1 681
722d2a37 682=head2 Integrate new modules
e50bb9a1 683
722d2a37 684Jarkko has been integrating madly into 5.7.x
e50bb9a1 685
722d2a37 686=head2 Integrate profiler
e50bb9a1 687
722d2a37 688C<Devel::DProf> is now a core module.
e50bb9a1 689
722d2a37 690=head2 Y2K error detection
e50bb9a1 691
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692There's a configure option to detect unsafe concatenation with "19", and
693a CPAN module. (C<D'oh::Year>)
e50bb9a1 694
722d2a37 695=head2 Regular expression debugger
e50bb9a1 696
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697While not part of core, Mark-Jason Dominus has written C<Rx> and has
698also come up with a generalised strategy for regular expression
699debugging.
e50bb9a1 700
722d2a37 701=head2 POD checker
e50bb9a1 702
722d2a37 703That's, uh, F<podchecker>
e50bb9a1 704
722d2a37 705=head2 "Dynamic" lexicals
e50bb9a1 706
722d2a37 707=head2 Cache precompiled modules
e50bb9a1 708
722d2a37 709=head1 Deprecated Wishes
e50bb9a1 710
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711These are items which used to be in the todo file, but have been
712deprecated for some reason.
e50bb9a1 713
722d2a37 714=head2 Loop control on do{}
e50bb9a1 715
722d2a37 716This would break old code; use C<do{{ }}> instead.
e50bb9a1 717
722d2a37 718=head2 Lexically scoped typeglobs
e50bb9a1 719
722d2a37 720Not needed now we have lexical IO handles.
e50bb9a1 721
722d2a37 722=head2 format BOTTOM
3958b146 723
722d2a37 724=head2 report HANDLE
e50bb9a1 725
722d2a37 726Damian Conway's text formatting modules seem to be the Way To Go.
e50bb9a1 727
722d2a37 728=head2 Generalised want()/caller())
3958b146 729
722d2a37 730=head2 Named prototypes
e50bb9a1 731
722d2a37 732These both seem to be delayed until Perl 6.
e50bb9a1 733
722d2a37 734=head2 Built-in globbing
e50bb9a1 735
722d2a37 736The C<File::Glob> module has been used to replace the C<glob> function.
e50bb9a1 737
722d2a37 738=head2 Regression tests for suidperl
e50bb9a1 739
722d2a37 740C<suidperl> is deprecated in favour of common sense.
e50bb9a1 741
722d2a37 742=head2 Cached hash values
e50bb9a1 743
722d2a37 744We have shared hash keys, which perform the same job.
e50bb9a1 745
722d2a37 746=head2 Add compression modules
e50bb9a1 747
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748The compression modules are a little heavy; meanwhile, Nick Clark is
749working on experimental pragmata to do transparent decompression on
750input.
e50bb9a1 751
722d2a37 752=head2 Reorganise documentation into tutorials/references
e50bb9a1 753
722d2a37 754Could not get consensus on P5P about this.
e50bb9a1 755
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756=head2 Remove distinction between functions and operators
757
758Caution: highly flammable.
759
760=head2 Make XS easier to use
e50bb9a1 761
722d2a37 762Use C<Inline> instead, or SWIG.
e50bb9a1 763
722d2a37 764=head2 Make embedding easier to use
e50bb9a1 765
722d2a37 766Use C<Inline::CPR>.
e50bb9a1 767
722d2a37 768=head2 man for perl
04c70446 769
722d2a37 770See the Perl Power Tools. (http://language.perl.com/ppt/)
04c70446 771
722d2a37 772=head2 my $Package::variable
04c70446 773
722d2a37 774Use C<our> instead.
04c70446 775
722d2a37 776=head2 "or" tests defined, not truth
04c70446 777
722d2a37 778Suggesting this on P5P B<will> cause a boring and interminable flamewar.
04c70446 779
722d2a37 780=head2 "class"-based lexicals
04c70446 781
cbb3fa72 782Use flyweight objects, secure hashes or, dare I say it, pseudo-hashes instead.
04c70446 783
722d2a37 784=head2 byteperl
04c70446 785
722d2a37 786C<ByteLoader> covers this.
04c70446 787
722d2a37 788=head2 Lazy evaluation / tail recursion removal
04c70446 789
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790C<List::Util> in core gives some of these; tail recursion removal is
791done manually, with C<goto &whoami;>. (However, MJD has found that
792C<goto &whoami> introduces a performance penalty, so maybe there should
793be a way to do this after all: C<sub foo {START: ... goto START;> is
794better.)
0562c0e3
JH
795
796=head2 Make "use utf8" the default
797
798There is a patch available for this, search p5p archives for
799the Subject "[EXPERIMENTAL PATCH] make unicode (utf8) default"
800but this would be unacceptable because of backward compatibility:
801scripts could not contain B<any legacy eight-bit data>. Also would
802introduce a measurable slowdown of at least few percentages since all
803regular expression operations would be done in full UTF-8.
804