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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
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57NOTE: pv_display(), pv_uni_display(), sv_uni_display() are doing
58something like the above.
59
722d2a37 60=head2 Overloadable regex assertions
e50bb9a1 61
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62This may or may not be possible with the current regular expression
63engine. The idea is that, for instance, C<\b> needs to be
64algorithmically computed if you're dealing with Thai text. Hence, the
65B<\b> assertion wants to be overloaded by a function.
e50bb9a1 66
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67=head2 Unicode
68
69=over 4
70
71=item *
e50bb9a1 72
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73Allow for long form of the General Category Properties, e.g
74C<\p{IsOpenPunctuation}>, not just the abbreviated form, e.g.
75C<\p{IsPs}>.
76
77=item *
78
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79Allow for the metaproperties: C<XID Start>, C<XID Continue>,
80C<NF*_NO>, C<NF*_MAYBE> (require the DerivedCoreProperties and
81DerviceNormalizationProperties files).
f34dec15 82
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83There are also multiple value properties still unimplemented:
84C<Numeric Type>, C<East Asian Width>.
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85
86=item *
87
722d2a37 88 Case Mappings? http://www.unicode.org/unicode/reports/tr21/
e50bb9a1 89
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90lc(), uc(), lcfirst(), and ucfirst() work only for some of the
91simplest cases, where the mapping goes from a single Unicode character
92to another single Unicode character. See lib/unicore/SpecCase.txt
93(and CaseFold.txt).
ac1256e8 94
776f8809 95=item *
e50bb9a1 96
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97They have some tricks Perl doesn't yet implement like character
98class subtraction.
e50bb9a1 99
722d2a37 100 http://www.unicode.org/unicode/reports/tr18/
e50bb9a1 101
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102=back
103
104See L<perlunicode/UNICODE REGULAR EXPRESSION SUPPORT LEVEL> for what's
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105there and what's missing. Almost all of Levels 2 and 3 is missing,
106and as of 5.8.0 not even all of Level 1 is there.
776f8809 107
722d2a37 108=head2 use Thread for iThreads
e50bb9a1 109
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110Artur Bergman's C<iThreads> module is a start on this, but needs to
111be more mature.
e50bb9a1 112
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113=head2 make perl_clone optionally clone ops
114
115So that pseudoforking, mod_perl, iThreads and nvi will work properly
116(but not as efficiently) until the regex engine is fixed to be threadsafe.
117
722d2a37 118=head2 Work out exit/die semantics for threads
e50bb9a1 119
722d2a37 120=head2 Typed lexicals for compiler
e50bb9a1 121
722d2a37 122=head2 Compiler workarounds for Win32
e50bb9a1 123
722d2a37 124=head2 AUTOLOADing in the compiler
e50bb9a1 125
722d2a37 126=head2 Fixing comppadlist when compiling
e50bb9a1 127
722d2a37 128=head2 Cleaning up exported namespace
e50bb9a1 129
722d2a37 130=head2 Complete signal handling
e50bb9a1 131
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132Add C<PERL_ASYNC_CHECK> to opcodes which loop; replace C<sigsetjmp> with
133C<sigjmp>; check C<wait> for signal safety.
e50bb9a1 134
722d2a37 135=head2 Out-of-source builds
e50bb9a1 136
722d2a37 137This was done for 5.6.0, but needs reworking for 5.7.x
e50bb9a1 138
722d2a37 139=head2 POSIX realtime support
e50bb9a1 140
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141POSIX 1003.1 1996 Edition support--realtime stuff: POSIX semaphores,
142message queues, shared memory, realtime clocks, timers, signals (the
143metaconfig units mostly already exist for these)
e50bb9a1 144
722d2a37 145=head2 UNIX98 support
e50bb9a1 146
722d2a37 147Reader-writer locks, realtime/asynchronous IO
e50bb9a1 148
722d2a37 149=head2 IPv6 Support
e50bb9a1 150
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151There are non-core modules, such as C<Net::IPv6>, but these will need
152integrating when IPv6 actually starts to really happen. See RFC 2292
153and RFC 2553.
e50bb9a1 154
722d2a37 155=head2 Long double conversion
e50bb9a1 156
722d2a37 157Floating point formatting is still causing some weird test failures.
e50bb9a1 158
722d2a37 159=head2 Locales
e50bb9a1 160
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161Locales and Unicode interact with each other in unpleasant ways.
162One possible solution would be to adopt/support ICU:
e50bb9a1 163
722d2a37 164 http://oss.software.ibm.com/developerworks/opensource/icu/project/
e50bb9a1 165
722d2a37 166=head2 Thread-safe regexes
e50bb9a1 167
722d2a37 168The regular expression engine is currently non-threadsafe.
e50bb9a1 169
722d2a37 170=head2 Arithmetic on non-Arabic numerals
e50bb9a1 171
722d2a37 172C<[1234567890]> aren't the only numerals any more.
e50bb9a1 173
722d2a37 174=head2 POSIX Unicode character classes
e50bb9a1 175
210b36aa 176(C<[=a=]> for equivalance classes, C<[.ch.]> for collation.)
722d2a37 177These are dependent on Unicode normalization and collation.
e50bb9a1 178
722d2a37 179=head2 Factoring out common suffices/prefices in regexps (trie optimization)
c47ff5f1 180
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181Currently, the user has to optimize C<foo|far> and C<foo|goo> into
182C<f(?:oo|ar)> and C<[fg]oo> by hand; this could be done automatically.
e50bb9a1 183
722d2a37 184=head2 Security audit shipped utilities
e50bb9a1 185
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186All the code we ship with Perl needs to be sensible about temporary file
187handling, locking, input validation, and so on.
e50bb9a1 188
722d2a37 189=head2 Custom opcodes
e50bb9a1 190
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191Have a way to introduce user-defined opcodes without the subroutine call
192overhead of an XSUB; the user should be able to create PP code. Simon
193Cozens has some ideas on this.
e50bb9a1 194
722d2a37 195=head2 DLL Versioning
e50bb9a1 196
d1be9408 197Windows needs a way to know what version of an XS or C<libperl> DLL it's
722d2a37 198loading.
e50bb9a1 199
722d2a37 200=head2 Introduce @( and @)
e50bb9a1 201
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202C<$(> may return "foo bar baz". Unfortunately, since groups can
203theoretically have spaces in their names, this could be one, two or
204three groups.
e50bb9a1 205
722d2a37 206=head2 Floating point handling
e50bb9a1 207
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208C<NaN> and C<inf> support is particularly troublesome.
209(fp_classify(), fp_class(), fp_class_d(), class(), isinf(),
210isfinite(), finite(), isnormal(), unordered(), <ieeefp.h>,
211<fp_class.h> (there are metaconfig units for all these) (I think),
212fp_setmask(), fp_getmask(), fp_setround(), fp_getround()
213(no metaconfig units yet for these). Don't forget finitel(), fp_classl(),
214fp_class_l(), (yes, both do, unfortunately, exist), and unorderedl().)
e50bb9a1 215
210b36aa 216As of Perl 5.6.1, there is a Perl macro, Perl_isnan().
e50bb9a1 217
722d2a37 218=head2 IV/UV preservation
e50bb9a1 219
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220Nicholas Clark has done a lot of work on this, but work is continuing.
221C<+>, C<-> and C<*> work, but guards need to be in place for C<%>, C</>,
222C<&>, C<oct>, C<hex> and C<pack>.
e50bb9a1 223
722d2a37 224=head2 Replace pod2html with something using Pod::Parser
83df6a1d 225
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226The CPAN module C<Malik::Pod::Html> may be a more suitable basis for a
227C<pod2html> convertor; the current one duplicates the functionality
228abstracted in C<Pod::Parser>, which makes updating the POD language
229difficult.
e50bb9a1 230
722d2a37 231=head2 Automate module testing on CPAN
e50bb9a1 232
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233When a new Perl is being beta tested, porters have to manually grab
234their favourite CPAN modules and test them - this should be done
235automatically.
e50bb9a1 236
722d2a37 237=head2 sendmsg and recvmsg
83df6a1d 238
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239We have all the other BSD socket functions but these. There are
240metaconfig units for these functions which can be added. To avoid these
241being new opcodes, a solution similar to the way C<sockatmark> was added
242would be preferable. (Autoload the C<IO::whatever> module.)
e50bb9a1 243
722d2a37 244=head2 Rewrite perlre documentation
e50bb9a1 245
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246The new-style patterns need full documentation, and the whole document
247needs to be a lot clearer.
e50bb9a1 248
722d2a37 249=head2 Convert example code to IO::Handle filehandles
e50bb9a1 250
722d2a37 251=head2 Document Win32 choices
e50bb9a1 252
722d2a37 253=head2 Check new modules
e50bb9a1 254
722d2a37 255=head2 Make roffitall find pods and libs itself
e50bb9a1 256
722d2a37 257Simon Cozens has done some work on this but it needs a rethink.
e50bb9a1 258
722d2a37 259=head1 To do at some point
e50bb9a1 260
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261These are ideas that have been regularly tossed around, that most
262people believe should be done maybe during 5.8.x
e50bb9a1 263
722d2a37 264=head2 Remove regular expression recursion
e50bb9a1 265
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266Because the regular expression engine is recursive, badly designed
267expressions can lead to lots of recursion filling up the stack. Ilya
268claims that it is easy to convert the engine to being iterative, but
269this has still not yet been done. There may be a regular expression
270engine hit squad meeting at TPC5.
e50bb9a1 271
722d2a37 272=head2 Memory leaks after failed eval
e50bb9a1 273
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274Perl will leak memory if you C<eval "hlagh hlagh hlagh hlagh">. This is
275partially because it attempts to build up an op tree for that code and
276doesn't properly free it. The same goes for non-syntactically-correct
277regular expressions. Hugo looked into this, but decided it needed a
278mark-and-sweep GC implementation.
e50bb9a1 279
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280Alan notes that: The basic idea was to extend the parser token stack
281(C<YYSTYPE>) to include a type field so we knew what sort of thing each
210b36aa 282element of the stack was. The F<perly.c> code would then have to be
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283postprocessed to record the type of each entry on the stack as it was
284created, and the parser patched so that it could unroll the stack
285properly on error.
e50bb9a1 286
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287This is possible to do, but would be pretty messy to implement, as it
288would rely on even more sed hackery in F<perly.fixer>.
e50bb9a1 289
722d2a37 290=head2 pack "(stuff)*"
e50bb9a1 291
722d2a37 292That's to say, C<pack "(sI)40"> would be the same as C<pack "sI"x40>
e50bb9a1 293
722d2a37 294=head2 bitfields in pack
e50bb9a1 295
722d2a37 296=head2 Cross compilation
e50bb9a1 297
722d2a37 298Make Perl buildable with a cross-compiler. This will play havoc with
da75cd15 299Configure, which needs to know how the target system will respond to
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300its tests; maybe C<microperl> will be a good starting point here.
301(Indeed, Bart Schuller reports that he compiled up C<microperl> for
302the Agenda PDA and it works fine.) A really big spanner in the works
303is the bootstrapping build process of Perl: if the filesystem the
304target systems sees is not the same what the build host sees, various
305input, output, and (Perl) library files need to be copied back and forth.
e50bb9a1 306
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307As of 5.8.0 Configure mostly works for cross-compilation
308(used successfully for iPAQ Linux), miniperl gets built,
309but then building DynaLoader (and other extensions) fails
310since MakeMaker knows nothing of cross-compilation.
311(See INSTALL/Cross-compilation for the state of things.)
312
722d2a37 313=head2 Perl preprocessor / macros
e50bb9a1 314
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315Source filters help with this, but do not get us all the way. For
316instance, it should be possible to implement the C<??> operator somehow;
317source filters don't (quite) cut it.
e50bb9a1 318
722d2a37 319=head2 Perl lexer in Perl
a45bd81d 320
722d2a37 321Damian Conway is planning to work on this, but it hasn't happened yet.
e50bb9a1 322
722d2a37 323=head2 Using POSIX calls internally
e50bb9a1 324
210b36aa 325When faced with a BSD vs. SysV -style interface to some library or
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326system function, perl's roots show in that it typically prefers the BSD
327interface (but falls back to the SysV one). One example is getpgrp().
328Other examples include C<memcpy> vs. C<bcopy>. There are others, mostly in
210b36aa 329F<pp_sys.c>.
e50bb9a1 330
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331Mostly, this item is a suggestion for which way to start a journey into
332an C<#ifdef> forest. It is not primarily a suggestion to eliminate any of
333the C<#ifdef> forests.
e50bb9a1 334
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335POSIX calls are perhaps more likely to be portable to unexpected
336architectures. They are also perhaps more likely to be actively
337maintained by a current vendor. They are also perhaps more likely to be
338available in thread-safe versions, if appropriate.
e50bb9a1 339
722d2a37 340=head2 -i rename file when changed
e50bb9a1 341
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342It's only necessary to rename a file when inplace editing when the file
343has changed. Detecting a change is perhaps the difficult bit.
e50bb9a1 344
722d2a37 345=head2 All ARGV input should act like E<lt>E<gt>
e50bb9a1 346
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347eg C<read(ARGV, ...)> doesn't currently read across multiple files.
348
722d2a37 349=head2 Support for rerunning debugger
e50bb9a1 350
722d2a37 351There should be a way of restarting the debugger on demand.
e50bb9a1 352
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353=head2 Test Suite for the Debugger
354
355The debugger is a complex piece of software and fixing something
356here may inadvertently break something else over there. To tame
357this chaotic behaviour, a test suite is necessary.
358
722d2a37 359=head2 my sub foo { }
c47ff5f1 360
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361The basic principle is sound, but there are problems with the semantics
362of self-referential and mutually referential lexical subs: how to
363declare the subs?
c47ff5f1 364
722d2a37 365=head2 One-pass global destruction
c47ff5f1 366
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367Sweeping away all the allocated memory in one go is a laudable goal, but
368it's difficult and in most cases, it's easier to let the memory get
369freed by exiting.
e50bb9a1 370
722d2a37 371=head2 Rewrite regexp parser
e50bb9a1 372
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373There has been talk recently of rewriting the regular expression parser
374to produce an optree instead of a chain of opcodes; it's unclear whether
375or not this would be a win.
e50bb9a1 376
722d2a37 377=head2 Cache recently used regexps
e50bb9a1 378
722d2a37 379This is to speed up
e50bb9a1 380
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381 for my $re (@regexps) {
382 $matched++ if /$re/
383 }
e50bb9a1 384
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385C<qr//> already gives us a way of saving compiled regexps, but it should
386be done automatically.
e50bb9a1 387
722d2a37 388=head2 Re-entrant functions
e50bb9a1 389
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390Add configure probes for C<_r> forms of system calls and fit them to the
391core. Unfortunately, calling conventions for these functions and not
392standardised.
04c70446 393
722d2a37 394=head2 Cross-compilation support
04c70446 395
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396Bart Schuller reports that using C<microperl> and a cross-compiler, he
397got Perl working on the Agenda PDA. However, one cannot build a full
398Perl because Configure needs to get the results for the target platform,
399for the host.
e50bb9a1 400
722d2a37 401=head2 Bit-shifting bitvectors
e50bb9a1 402
722d2a37 403Given:
e50bb9a1 404
722d2a37 405 vec($v, 1000, 1) = 1;
e50bb9a1 406
722d2a37 407One should be able to do
e50bb9a1 408
722d2a37 409 $v <<= 1;
e50bb9a1 410
722d2a37 411and have the 999'th bit set.
e50bb9a1 412
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413Currently if you try with shift bitvectors you shift the NV/UV, instead
414of the bits in the PV. Not very logical.
e50bb9a1 415
722d2a37 416=head2 debugger pragma
e50bb9a1 417
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418The debugger is implemented in Perl in F<perl5db.pl>; turning it into a
419pragma should be easy, but making it work lexically might be more
420difficult. Fiddling with C<$^P> would be necessary.
e50bb9a1 421
722d2a37 422=head2 use less pragma
e50bb9a1 423
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424Identify areas where speed/memory tradeoffs can be made and have a hint
425to switch between them.
e50bb9a1 426
722d2a37 427=head2 switch structures
e50bb9a1 428
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429Although we have C<Switch.pm> in core, Larry points to the dormant
430C<nswitch> and C<cswitch> ops in F<pp.c>; using these opcodes would be
431much faster.
e50bb9a1 432
722d2a37 433=head2 Cache eval tree
e50bb9a1 434
722d2a37 435=head2 rcatmaybe
e50bb9a1 436
722d2a37 437=head2 Shrink opcode tables
e50bb9a1 438
722d2a37 439=head2 Optimize away @_
e50bb9a1 440
722d2a37 441Look at the "reification" code in C<av.c>
e50bb9a1 442
722d2a37 443=head2 Prototypes versus indirect objects
e50bb9a1 444
722d2a37 445Currently, indirect object syntax bypasses prototype checks.
e50bb9a1 446
210b36aa 447=head2 Install HTML
e50bb9a1 448
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449HTML versions of the documentation need to be installed by default; a
450call to C<installhtml> from C<installperl> may be all that's necessary.
e50bb9a1 451
722d2a37 452=head2 Prototype method calls
e50bb9a1 453
722d2a37 454=head2 Return context prototype declarations
e50bb9a1 455
722d2a37 456=head2 magic_setisa
e50bb9a1 457
722d2a37 458=head2 Garbage collection
e50bb9a1 459
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460There have been persistent mumblings about putting a mark-and-sweep
461garbage detector into Perl; Alan Burlison has some ideas about this.
e50bb9a1 462
722d2a37 463=head2 IO tutorial
e50bb9a1 464
722d2a37 465Mark-Jason Dominus has the beginnings of one of these.
e50bb9a1 466
722d2a37 467=head2 pack/unpack tutorial
e50bb9a1 468
722d2a37 469Simon Cozens has the beginnings of one of these.
e50bb9a1 470
722d2a37 471=head2 Rewrite perldoc
e50bb9a1 472
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473There are a few suggestions for what to do with C<perldoc>: maybe a
474full-text search, an index function, locating pages on a particular
475high-level subject, and so on.
e50bb9a1 476
3958b146 477=head2 Install .3p manpages
e50bb9a1 478
3958b146 479This is a bone of contention; we can create C<.3p> manpages for each
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480built-in function, but should we install them by default? Tcl does this,
481and it clutters up C<apropos>.
e50bb9a1 482
722d2a37 483=head2 Unicode tutorial
e50bb9a1 484
722d2a37 485Simon Cozens promises to do this before he gets old.
e50bb9a1 486
722d2a37 487=head2 Update POSIX.pm for 1003.1-2
3958b146 488
722d2a37 489=head2 Retargetable installation
e50bb9a1 490
722d2a37 491Allow C<@INC> to be changed after Perl is built.
e50bb9a1 492
722d2a37 493=head2 POSIX emulation on non-POSIX systems
e50bb9a1 494
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495Make C<POSIX.pm> behave as POSIXly as possible everywhere, meaning we
496have to implement POSIX equivalents for some functions if necessary.
e50bb9a1 497
722d2a37 498=head2 Rename Win32 headers
e50bb9a1 499
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500=head2 Finish off lvalue functions
501
502They don't work in the debugger, and they don't work for list or hash
503slices.
e50bb9a1 504
722d2a37 505=head2 Update sprintf documentation
e50bb9a1 506
722d2a37 507Hugo van der Sanden plans to look at this.
e50bb9a1 508
722d2a37 509=head2 Use fchown/fchmod internally
e50bb9a1 510
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511This has been done in places, but needs a thorough code review.
512Also fchdir is available in some platforms.
e50bb9a1 513
d45541b3 514=head2 Make v-strings overloaded objects
c5fc23ff 515
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516Instead of having to guess whether a string is a v-string and thus
517needs to be displayed with %vd, make v-strings (readonly) objects
518(class "vstring"?) with a stringify overload.
c5fc23ff 519
722d2a37 520=head1 Vague ideas
e50bb9a1 521
722d2a37 522Ideas which have been discussed, and which may or may not happen.
e50bb9a1 523
722d2a37 524=head2 ref() in list context
e50bb9a1 525
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526It's unclear what this should do or how to do it without breaking old
527code.
e50bb9a1 528
f86a8bc5 529=head2 Make tr/// return histogram of characters in list context
e50bb9a1 530
722d2a37 531There is a patch for this, but it may require Unicodification.
e50bb9a1 532
722d2a37 533=head2 Compile to real threaded code
3958b146 534
722d2a37 535=head2 Structured types
3958b146 536
722d2a37 537=head2 Modifiable $1 et al.
e50bb9a1 538
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539 ($x = "elephant") =~ /e(ph)/;
540 $1 = "g"; # $x = "elegant"
e50bb9a1 541
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542What happens if there are multiple (nested?) brackets? What if the
543string changes between the match and the assignment?
e50bb9a1 544
722d2a37 545=head2 Procedural interfaces for IO::*, etc.
e50bb9a1 546
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547Some core modules have been accused of being overly-OO. Adding
548procedural interfaces could demystify them.
e50bb9a1 549
722d2a37 550=head2 RPC modules
e50bb9a1 551
722d2a37 552=head2 Attach/detach debugger from running program
e50bb9a1 553
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554With C<gdb>, you can attach the debugger to a running program if you
555pass the process ID. It would be good to do this with the Perl debugger
556on a running Perl program, although I'm not sure how it would be done.
e50bb9a1 557
722d2a37 558=head2 Alternative RE syntax module
e50bb9a1 559
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560 use Regex::Newbie;
561 $re = Regex::Newbie->new
562 ->start
563 ->match("foo")
564 ->repeat(Regex::Newbie->class("char"),3)
565 ->end;
566 /$re/;
e50bb9a1 567
722d2a37 568=head2 GUI::Native
e50bb9a1 569
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570A non-core module that would use "native" GUI to create graphical
571applications.
e50bb9a1 572
722d2a37 573=head2 foreach(reverse ...)
e50bb9a1 574
722d2a37 575Currently
e50bb9a1 576
722d2a37 577 foreach (reverse @_) { ... }
e50bb9a1 578
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579puts C<@_> on the stack, reverses it putting the reversed version on the
580stack, then iterates forwards. Instead, it could be special-cased to put
581C<@_> on the stack then iterate backwards.
e50bb9a1 582
722d2a37 583=head2 Constant function cache
e50bb9a1 584
722d2a37 585=head2 Approximate regular expression matching
e50bb9a1 586
722d2a37 587=head1 Ongoing
e50bb9a1 588
722d2a37 589These items B<always> need doing:
e50bb9a1 590
722d2a37 591=head2 Update guts documentation
e50bb9a1 592
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593Simon Cozens tries to do this when possible, and contributions to the
594C<perlapi> documentation is welcome.
e50bb9a1 595
722d2a37 596=head2 Add more tests
e50bb9a1 597
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598Michael Schwern will donate $500 to Yet Another Society when all core
599modules have tests.
e50bb9a1 600
722d2a37 601=head2 Update auxiliary tools
e50bb9a1 602
722d2a37 603The code we ship with Perl should look like good Perl 5.
e50bb9a1 604
722d2a37 605=head1 Recently done things
e50bb9a1 606
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607These are things which have been on the todo lists in previous releases
608but have recently been completed.
e50bb9a1 609
722d2a37 610=head2 Safe signal handling
e50bb9a1 611
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612A new signal model went into 5.7.1 without much fanfare. Operations and
613C<malloc>s are no longer interrupted by signals, which are handled
614between opcodes. This means that C<PERL_ASYNC_CHECK> now actually does
615something. However, there are still a few things that need to be done.
e50bb9a1 616
722d2a37 617=head2 Tie Modules
e50bb9a1 618
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619Modules which implement arrays in terms of strings, substrings or files
620can be found on the CPAN.
e50bb9a1 621
722d2a37 622=head2 gettimeofday
e50bb9a1 623
210b36aa 624C<Time::HiRes> has been integrated into the core.
e50bb9a1 625
722d2a37 626=head2 setitimer and getimiter
e50bb9a1 627
210b36aa 628Adding C<Time::HiRes> got us this too.
e50bb9a1 629
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630=head2 Testing __DIE__ hook
631
632Tests have been added.
633
634=head2 CPP equivalent in Perl
e50bb9a1 635
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636A C Yardley will probably have done this by the time you can read this.
637This allows for a generalization of the C constant detection used in
638building C<Errno.pm>.
e50bb9a1 639
722d2a37 640=head2 Explicit switch statements
e50bb9a1 641
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642C<Switch.pm> has been integrated into the core to give you all manner of
643C<switch...case> semantics.
e50bb9a1 644
722d2a37 645=head2 autocroak
e50bb9a1 646
722d2a37 647This is C<Fatal.pm>.
e50bb9a1 648
722d2a37 649=head2 UTF/EBCDIC
e50bb9a1 650
722d2a37 651Nick Ing-Simmons has made UTF-EBCDIC (UTR13) work with Perl.
e50bb9a1 652
722d2a37 653 EBCDIC? http://www.unicode.org/unicode/reports/tr16/
e50bb9a1 654
722d2a37 655=head2 UTF Regexes
e50bb9a1 656
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657Although there are probably some small bugs to be rooted out, Jarkko
658Hietaniemi has made regular expressions polymorphic between bytes and
659characters.
e50bb9a1 660
722d2a37 661=head2 perlcc to produce executable
e50bb9a1 662
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663C<perlcc> was recently rewritten, and can now produce standalone
664executables.
e50bb9a1 665
722d2a37 666=head2 END blocks saved in compiled output
e50bb9a1 667
722d2a37 668=head2 Secure temporary file module
e50bb9a1 669
722d2a37 670Tim Jenness' C<File::Temp> is now in core.
e50bb9a1 671
722d2a37 672=head2 Integrate Time::HiRes
e50bb9a1 673
722d2a37 674This module is now part of core.
e50bb9a1 675
722d2a37 676=head2 Turn Cwd into XS
e50bb9a1 677
722d2a37 678Benjamin Sugars has done this.
e50bb9a1 679
722d2a37 680=head2 Mmap for input
e50bb9a1 681
722d2a37 682Nick Ing-Simmons' C<perlio> supports an C<mmap> IO method.
e50bb9a1 683
722d2a37 684=head2 Byte to/from UTF8 and UTF8 to/from local conversion
e50bb9a1 685
722d2a37 686C<Encode> provides this.
e50bb9a1 687
722d2a37 688=head2 Add sockatmark support
e50bb9a1 689
722d2a37 690Added in 5.7.1
e50bb9a1 691
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692=head2 Mailing list archives
693
694http://lists.perl.org/, http://archive.develooper.com/
695
696=head2 Bug tracking
697
698Richard Foley has written the bug tracking system at http://bugs.perl.org/
e50bb9a1 699
722d2a37 700=head2 Integrate MacPerl
e50bb9a1 701
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702Chris Nandor and Matthias Neeracher have integrated the MacPerl changes
703into 5.6.0.
e50bb9a1 704
722d2a37 705=head2 Web "nerve center" for Perl
e50bb9a1 706
722d2a37 707http://use.perl.org/ is what you're looking for.
e50bb9a1 708
722d2a37 709=head2 Regular expression tutorial
e50bb9a1 710
722d2a37 711C<perlretut>, provided by Mark Kvale.
e50bb9a1 712
722d2a37 713=head2 Debugging Tutorial
e50bb9a1 714
722d2a37 715C<perldebtut>, written by Richard Foley.
e50bb9a1 716
722d2a37 717=head2 Integrate new modules
e50bb9a1 718
722d2a37 719Jarkko has been integrating madly into 5.7.x
e50bb9a1 720
722d2a37 721=head2 Integrate profiler
e50bb9a1 722
722d2a37 723C<Devel::DProf> is now a core module.
e50bb9a1 724
722d2a37 725=head2 Y2K error detection
e50bb9a1 726
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727There's a configure option to detect unsafe concatenation with "19", and
728a CPAN module. (C<D'oh::Year>)
e50bb9a1 729
722d2a37 730=head2 Regular expression debugger
e50bb9a1 731
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732While not part of core, Mark-Jason Dominus has written C<Rx> and has
733also come up with a generalised strategy for regular expression
734debugging.
e50bb9a1 735
722d2a37 736=head2 POD checker
e50bb9a1 737
722d2a37 738That's, uh, F<podchecker>
e50bb9a1 739
722d2a37 740=head2 "Dynamic" lexicals
e50bb9a1 741
722d2a37 742=head2 Cache precompiled modules
e50bb9a1 743
722d2a37 744=head1 Deprecated Wishes
e50bb9a1 745
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746These are items which used to be in the todo file, but have been
747deprecated for some reason.
e50bb9a1 748
722d2a37 749=head2 Loop control on do{}
e50bb9a1 750
722d2a37 751This would break old code; use C<do{{ }}> instead.
e50bb9a1 752
722d2a37 753=head2 Lexically scoped typeglobs
e50bb9a1 754
722d2a37 755Not needed now we have lexical IO handles.
e50bb9a1 756
722d2a37 757=head2 format BOTTOM
3958b146 758
722d2a37 759=head2 report HANDLE
e50bb9a1 760
722d2a37 761Damian Conway's text formatting modules seem to be the Way To Go.
e50bb9a1 762
722d2a37 763=head2 Generalised want()/caller())
3958b146 764
722d2a37 765=head2 Named prototypes
e50bb9a1 766
722d2a37 767These both seem to be delayed until Perl 6.
e50bb9a1 768
722d2a37 769=head2 Built-in globbing
e50bb9a1 770
722d2a37 771The C<File::Glob> module has been used to replace the C<glob> function.
e50bb9a1 772
722d2a37 773=head2 Regression tests for suidperl
e50bb9a1 774
722d2a37 775C<suidperl> is deprecated in favour of common sense.
e50bb9a1 776
722d2a37 777=head2 Cached hash values
e50bb9a1 778
722d2a37 779We have shared hash keys, which perform the same job.
e50bb9a1 780
722d2a37 781=head2 Add compression modules
e50bb9a1 782
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783The compression modules are a little heavy; meanwhile, Nick Clark is
784working on experimental pragmata to do transparent decompression on
785input.
e50bb9a1 786
722d2a37 787=head2 Reorganise documentation into tutorials/references
e50bb9a1 788
722d2a37 789Could not get consensus on P5P about this.
e50bb9a1 790
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791=head2 Remove distinction between functions and operators
792
793Caution: highly flammable.
794
795=head2 Make XS easier to use
e50bb9a1 796
722d2a37 797Use C<Inline> instead, or SWIG.
e50bb9a1 798
722d2a37 799=head2 Make embedding easier to use
e50bb9a1 800
722d2a37 801Use C<Inline::CPR>.
e50bb9a1 802
722d2a37 803=head2 man for perl
04c70446 804
722d2a37 805See the Perl Power Tools. (http://language.perl.com/ppt/)
04c70446 806
722d2a37 807=head2 my $Package::variable
04c70446 808
722d2a37 809Use C<our> instead.
04c70446 810
722d2a37 811=head2 "or" tests defined, not truth
04c70446 812
722d2a37 813Suggesting this on P5P B<will> cause a boring and interminable flamewar.
04c70446 814
722d2a37 815=head2 "class"-based lexicals
04c70446 816
cbb3fa72 817Use flyweight objects, secure hashes or, dare I say it, pseudo-hashes instead.
f86a8bc5 818(Or whatever will replace pseudohashes in 5.10.)
04c70446 819
722d2a37 820=head2 byteperl
04c70446 821
722d2a37 822C<ByteLoader> covers this.
04c70446 823
722d2a37 824=head2 Lazy evaluation / tail recursion removal
04c70446 825
f86a8bc5
JH
826C<List::Util> gives first() (a short-circuiting grep); tail recursion
827removal is done manually, with C<goto &whoami;>. (However, MJD has
828found that C<goto &whoami> introduces a performance penalty, so maybe
829there should be a way to do this after all: C<sub foo {START: ... goto
830START;> is better.)
0562c0e3
JH
831
832=head2 Make "use utf8" the default
833
f86a8bc5
JH
834Because of backward compatibility this is difficult: scripts could not
835contain B<any legacy eight-bit data> (like Latin-1) anymore, even in
836string literals or pod. Also would introduce a measurable slowdown of
837at least few percentages since all regular expression operations would
838be done in full UTF-8. But if you want to try this, add
839-DUSE_UTF8_SCRIPTS to your compilation flags.
840
3298bd4d
JH
841=head2 Unicode collation and normalization
842
843The Unicode::Collate and Unicode::Normalize modules
844by SADAHIRO Tomoyuki have been included since 5.8.0.
845
846 Collation? http://www.unicode.org/unicode/reports/tr10/
847 Normalization? http://www.unicode.org/unicode/reports/tr15/
0562c0e3 848
825b3abc
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849=head2 Create debugging macros
850
851Debugging macros (like printsv, dump) can make debugging perl inside a
852C debugger much easier. A good set for gdb comes with mod_perl.
853Something similar should be distributed with perl.
854
855The proper way to do this is to use and extend Devel::DebugInit.
856Devel::DebugInit also needs to be extended to support threads.
857
858See p5p archives for late May/early June 2001 for a recent discussion
859on this topic.
860
3298bd4d 861=cut