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1.7 |
#! perl-000 |
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1.1 |
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open STDOUT, ">$ARGV[0]~" |
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or die "$ARGV[0]~: $!"; |
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our $WARN; |
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our $H; |
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BEGIN { |
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$H = $^H; |
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$WARN = ${^WARNING_BITS}; |
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} |
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use utf8; |
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use strict qw(subs vars); |
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no warnings; |
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1.4 |
use warnings qw(FATAL closed threads internal debugging pack malloc portable prototype |
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1.7 |
inplace io pipe unpack deprecated glob digit printf |
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1.2 |
layer reserved taint closure semicolon); |
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1.1 |
no warnings qw(exec newline unopened); |
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BEGIN { |
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$H = $^H & ~$H; |
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$WARN = ${^WARNING_BITS} & ~$WARN; |
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} |
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while (<DATA>) { |
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if (/^IMPORT/) { |
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print " # use warnings\n"; |
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printf " \${^WARNING_BITS} ^= \${^WARNING_BITS} ^ \"%s\";\n", |
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join "", map "\\x$_", unpack "(H2)*", $WARN; |
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print " # use strict, use utf8;\n"; |
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printf " \$^H |= 0x%x;\n", $H; |
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} else { |
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print; |
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} |
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} |
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close STDOUT; |
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rename "$ARGV[0]~", $ARGV[0]; |
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__DATA__ |
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=head1 NAME |
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common::sense - save a tree AND a kitten, use common::sense! |
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=head1 SYNOPSIS |
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use common::sense; |
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# supposed to be the same, with much lower memory usage, as: |
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# |
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# use utf8; |
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# use strict qw(vars subs); |
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# use feature qw(say state switch); |
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# no warnings; |
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root |
1.7 |
# use warnings qw(FATAL closed threads internal debugging pack |
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# portable prototype inplace io pipe unpack malloc |
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root |
1.6 |
# deprecated glob digit printf layer |
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1.2 |
# reserved taint closure semicolon); |
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1.1 |
# no warnings qw(exec newline unopened); |
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1.5 |
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1.1 |
=head1 DESCRIPTION |
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1.5 |
“Nothing is more fairly distributed than common sense: no one thinks |
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he needs more of it than he already has.” |
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– René Descartes |
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root |
1.1 |
This module implements some sane defaults for Perl programs, as defined by |
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two typical (or not so typical - use your common sense) specimens of Perl |
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coders. In fact, after working out details on which warnings and strict |
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modes to enable and make fatal, we found that we (and our code written so |
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far, and others) fully agree on every option, even though we never used |
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warnings before, so it seems this module indeed reflects a "common" sense |
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among some long-time Perl coders. |
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The basic philosophy behind the choices made in common::sense can be |
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summarised as: "enforcing strict policies to catch as many bugs as |
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possible, while at the same time, not limiting the expressive power |
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available to the programmer". |
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Two typical examples of how this philosophy is applied in practise is the |
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handling of uninitialised and malloc warnings: |
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=over 4 |
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=item I<uninitialised> |
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C<undef> is a well-defined feature of perl, and enabling warnings for |
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using it rarely catches any bugs, but considerably limits you in what you |
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can do, so uninitialised warnings are disabled. |
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=item I<malloc> |
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Freeing something twice on the C level is a serious bug, usually causing |
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memory corruption. It often leads to side effects much later in the |
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program and there are no advantages to not reporting this, so malloc |
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warnings are fatal by default. |
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=back |
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1.7 |
Unfortunately, there is no fine-grained warning control in perl, so often |
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whole groups of useful warnings had to be excluded because of a single |
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useless warning (for example, perl puts an arbitrary limit on the length |
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of text you can match with some regexes before emitting a warning, making |
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the whole C<regexp> category useless). |
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root |
1.1 |
What follows is a more thorough discussion of what this module does, |
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and why it does it, and what the advantages (and disadvantages) of this |
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approach are. |
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=head1 RATIONALE |
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=over 4 |
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=item use utf8 |
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While it's not common sense to write your programs in UTF-8, it's quickly |
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becoming the most common encoding, is the designated future default |
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encoding for perl sources, and the most convenient encoding available |
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(you can do really nice quoting tricks...). Experience has shown that our |
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programs were either all pure ascii or utf-8, both of which will stay the |
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same. |
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There are few drawbacks to enabling UTF-8 source code by default (mainly |
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some speed hits due to bugs in older versions of perl), so this module |
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enables UTF-8 source code encoding by default. |
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=item use strict qw(subs vars) |
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Using C<use strict> is definitely common sense, but C<use strict |
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'refs'> definitely overshoots its usefulness. After almost two |
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decades of Perl hacking, we decided that it does more harm than being |
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useful. Specifically, constructs like these: |
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@{ $var->[0] } |
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Must be written like this (or similarly), when C<use strict 'refs'> is in |
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scope, and C<$var> can legally be C<undef>: |
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@{ $var->[0] || [] } |
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This is annoying, and doesn't shield against obvious mistakes such as |
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using C<"">, so one would even have to write (at least for the time |
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being): |
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@{ defined $var->[0] ? $var->[0] : [] } |
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... which nobody with a bit of common sense would consider |
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writing: clear code is clearly something else. |
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Curiously enough, sometimes perl is not so strict, as this works even with |
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C<use strict> in scope: |
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160 |
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for (@{ $var->[0] }) { ... |
161 |
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162 |
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If that isn't hypocrisy! And all that from a mere program! |
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164 |
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165 |
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=item use feature qw(say state given) |
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167 |
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We found it annoying that we always have to enable extra features. If |
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something breaks because it didn't anticipate future changes, so be |
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it. 5.10 broke almost all our XS modules and nobody cared either (or at |
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least I know of nobody who really complained about gratuitous changes - |
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as opposed to bugs). |
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Few modules that are not actively maintained work with newer versions of |
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Perl, regardless of use feature or not, so a new major perl release means |
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changes to many modules - new keywords are just the tip of the iceberg. |
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If your code isn't alive, it's dead, Jim - be an active maintainer. |
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But nobody forces you to use those extra features in modules meant for |
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older versions of perl - common::sense of course works there as well. |
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There is also an important other mode where having additional features by |
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default is useful: commandline hacks and internal use scripts: See "much |
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reduced typing", below. |
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=item no warnings, but a lot of new errors |
187 |
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Ah, the dreaded warnings. Even worse, the horribly dreaded C<-w> |
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switch: Even though we don't care if other people use warnings (and |
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certainly there are useful ones), a lot of warnings simply go against the |
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spirit of Perl. |
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Most prominently, the warnings related to C<undef>. There is nothing wrong |
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with C<undef>: it has well-defined semantics, it is useful, and spitting |
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out warnings you never asked for is just evil. |
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The result was that every one of our modules did C<no warnings> in the |
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past, to avoid somebody accidentally using and forcing his bad standards |
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on our code. Of course, this switched off all warnings, even the useful |
200 |
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ones. Not a good situation. Really, the C<-w> switch should only enable |
201 |
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warnings for the main program only. |
202 |
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203 |
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Funnily enough, L<perllexwarn> explicitly mentions C<-w> (and not in a |
204 |
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favourable way, calling it outright "wrong"), but standard utilities, such |
205 |
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as L<prove>, or MakeMaker when running C<make test>, still enable them |
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blindly. |
207 |
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208 |
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For version 2 of common::sense, we finally sat down a few hours and went |
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through I<every single warning message>, identifiying - according to |
210 |
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common sense - all the useful ones. |
211 |
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212 |
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This resulted in the rather impressive list in the SYNOPSIS. When we |
213 |
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weren't sure, we didn't include the warning, so the list might grow in |
214 |
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the future (we might have made a mistake, too, so the list might shrink |
215 |
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as well). |
216 |
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217 |
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Note the presence of C<FATAL> in the list: we do not think that the |
218 |
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conditions caught by these warnings are worthy of a warning, we I<insist> |
219 |
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that they are worthy of I<stopping> your program, I<instantly>. They are |
220 |
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I<bugs>! |
221 |
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|
222 |
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Therefore we consider C<common::sense> to be much stricter than C<use |
223 |
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warnings>, which is good if you are into strict things (we are not, |
224 |
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actually, but these things tend to be subjective). |
225 |
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|
226 |
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|
After deciding on the list, we ran the module against all of our code that |
227 |
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uses C<common::sense> (that is almost all of our code), and found only one |
228 |
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occurence where one of them caused a problem: one of elmex's (unreleased) |
229 |
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modules contained: |
230 |
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231 |
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$fmt =~ s/([^\s\[]*)\[( [^\]]* )\]/\x0$1\x1$2\x0/xgo; |
232 |
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233 |
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We quickly agreed that indeed the code should be changed, even though it |
234 |
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happened to do the right thing when the warning was switched off. |
235 |
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236 |
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237 |
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=item much reduced typing |
238 |
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239 |
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|
Especially with version 2.0 of common::sense, the amount of boilerplate |
240 |
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code you need to add to gte I<this> policy is daunting. Nobody would write |
241 |
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this out in throwaway scripts, commandline hacks or in quick internal-use |
242 |
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scripts. |
243 |
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|
244 |
|
|
By using common::sense you get a defined set of policies (ours, but maybe |
245 |
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|
yours, too, if you accept them), and they are easy to apply to your |
246 |
|
|
scripts: typing C<use common::sense;> is even shorter than C<use warnings; |
247 |
|
|
use strict; use feature ...>. |
248 |
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|
249 |
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|
And you can immediately use the features of your installed perl, which |
250 |
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is more difficult in code you release, but not usually an issue for |
251 |
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internal-use code (downgrades of your production perl should be rare, |
252 |
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right?). |
253 |
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|
254 |
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|
255 |
|
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=item mucho reduced memory usage |
256 |
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|
257 |
|
|
Just using all those pragmas mentioned in the SYNOPSIS together wastes |
258 |
|
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<blink>I<< B<776> kilobytes >></blink> of precious memory in my perl, for |
259 |
|
|
I<every single perl process using our code>, which on our machines, is a |
260 |
|
|
lot. In comparison, this module only uses I<< B<four> >> kilobytes (I even |
261 |
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|
had to write it out so it looks like more) of memory on the same platform. |
262 |
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|
263 |
|
|
The money/time/effort/electricity invested in these gigabytes (probably |
264 |
|
|
petabytes globally!) of wasted memory could easily save 42 trees, and a |
265 |
|
|
kitten! |
266 |
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|
267 |
|
|
Unfortunately, until everybods applies more common sense, there will still |
268 |
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|
often be modules that pull in the monster pragmas. But one can hope... |
269 |
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|
270 |
|
|
=cut |
271 |
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|
272 |
|
|
package common::sense; |
273 |
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|
274 |
root |
1.9 |
our $VERSION = '3.5'; |
275 |
root |
1.1 |
|
276 |
|
|
# overload should be included |
277 |
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|
278 |
|
|
sub import { |
279 |
root |
1.9 |
local $^W; # work around perl 5.16 spewing out warnings for next line |
280 |
root |
1.1 |
IMPORT |
281 |
|
|
# use feature |
282 |
|
|
$^H{feature_switch} = |
283 |
|
|
$^H{feature_say} = |
284 |
|
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$^H{feature_state} = 1; |
285 |
|
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} |
286 |
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287 |
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1; |
288 |
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289 |
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=back |
290 |
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291 |
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=head1 THERE IS NO 'no common::sense'!!!! !!!! !! |
292 |
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293 |
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|
This module doesn't offer an unimport. First of all, it wastes even more |
294 |
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memory, second, and more importantly, who with even a bit of common sense |
295 |
|
|
would want no common sense? |
296 |
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|
297 |
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=head1 STABILITY AND FUTURE VERSIONS |
298 |
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|
299 |
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Future versions might change just about everything in this module. We |
300 |
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might test our modules and upload new ones working with newer versions of |
301 |
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this module, and leave you standing in the rain because we didn't tell |
302 |
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you. In fact, we did so when switching from 1.0 to 2.0, which enabled gobs |
303 |
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|
of warnings, and made them FATAL on top. |
304 |
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|
305 |
|
|
Maybe we will load some nifty modules that try to emulate C<say> or so |
306 |
|
|
with perls older than 5.10 (this module, of course, should work with older |
307 |
|
|
perl versions - supporting 5.8 for example is just common sense at this |
308 |
|
|
time. Maybe not in the future, but of course you can trust our common |
309 |
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sense to be consistent with, uhm, our opinion). |
310 |
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|
311 |
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|
=head1 WHAT OTHER PEOPLE HAD TO SAY ABOUT THIS MODULE |
312 |
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|
313 |
|
|
apeiron |
314 |
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|
315 |
|
|
"... wow" |
316 |
|
|
"I hope common::sense is a joke." |
317 |
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|
318 |
|
|
crab |
319 |
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|
320 |
|
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"i wonder how it would be if joerg schilling wrote perl modules." |
321 |
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|
322 |
|
|
Adam Kennedy |
323 |
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|
324 |
|
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"Very interesting, efficient, and potentially something I'd use all the time." |
325 |
|
|
[...] |
326 |
|
|
"So no common::sense for me, alas." |
327 |
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|
328 |
|
|
H.Merijn Brand |
329 |
|
|
|
330 |
|
|
"Just one more reason to drop JSON::XS from my distribution list" |
331 |
|
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|
332 |
|
|
Pista Palo |
333 |
|
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|
334 |
|
|
"Something in short supply these days..." |
335 |
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|
336 |
|
|
Steffen Schwigon |
337 |
|
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|
338 |
|
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"This module is quite for sure *not* just a repetition of all the other |
339 |
|
|
'use strict, use warnings'-approaches, and it's also not the opposite. |
340 |
|
|
[...] And for its chosen middle-way it's also not the worst name ever. |
341 |
|
|
And everything is documented." |
342 |
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|
343 |
|
|
BKB |
344 |
|
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|
345 |
|
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"[Deleted - thanks to Steffen Schwigon for pointing out this review was |
346 |
|
|
in error.]" |
347 |
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|
348 |
|
|
Somni |
349 |
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|
350 |
|
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"the arrogance of the guy" |
351 |
|
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"I swear he tacked somenoe else's name onto the module |
352 |
|
|
just so he could use the royal 'we' in the documentation" |
353 |
|
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|
354 |
|
|
Anonymous Monk |
355 |
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|
356 |
|
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"You just gotta love this thing, its got META.json!!!" |
357 |
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|
358 |
|
|
dngor |
359 |
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|
360 |
|
|
"Heh. '"<elmex at ta-sa.org>"' The quotes are semantic |
361 |
|
|
distancing from that e-mail address." |
362 |
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|
363 |
|
|
Jerad Pierce |
364 |
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|
365 |
|
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"Awful name (not a proper pragma), and the SYNOPSIS doesn't tell you |
366 |
|
|
anything either. Nor is it clear what features have to do with "common |
367 |
|
|
sense" or discipline." |
368 |
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|
369 |
|
|
acme |
370 |
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|
371 |
|
|
"THERE IS NO 'no common::sense'!!!! !!!! !!" |
372 |
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|
|
373 |
|
|
apeiron (meta-comment about us commenting^Wquoting his comment) |
374 |
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|
375 |
|
|
"How about quoting this: get a clue, you fucktarded amoeba." |
376 |
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|
377 |
|
|
quanth |
378 |
|
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|
379 |
|
|
"common sense is beautiful, json::xs is fast, Anyevent, EV are fast and |
380 |
|
|
furious. I love mlehmannware ;)" |
381 |
|
|
|
382 |
|
|
apeiron |
383 |
|
|
|
384 |
|
|
"... it's mlehmann's view of what common sense is. His view of common |
385 |
|
|
sense is certainly uncommon, insofar as anyone with a clue disagrees |
386 |
|
|
with him." |
387 |
|
|
|
388 |
|
|
apeiron (another meta-comment) |
389 |
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"apeiron wonders if his little informant is here to steal more quotes" |
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ew73 |
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"... I never got past the SYNOPSIS before calling it shit." |
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[...] |
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How come no one ever quotes me. :(" |
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root |
1.8 |
chip (not willing to explain his cryptic questions about links in Changes files) |
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"I'm willing to ask the question I've asked. I'm not willing to go |
401 |
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through the whole dance you apparently have choreographed. Either |
402 |
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answer the completely obvious question, or tell me to fuck off again." |
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404 |
root |
1.1 |
=head1 FREQUENTLY ASKED QUESTIONS |
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Or frequently-come-up confusions. |
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=over 4 |
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=item Is this module meant to be serious? |
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Yes, we would have put it under the C<Acme::> namespace otherwise. |
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=item But the manpage is written in a funny/stupid/... way? |
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416 |
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This was meant to make it clear that our common sense is a subjective |
417 |
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thing and other people can use their own notions, taking the steam out |
418 |
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of anybody who might be offended (as some people are always offended no |
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matter what you do). |
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This was a failure. |
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But we hope the manpage still is somewhat entertaining even though it |
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explains boring rationale. |
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=item Why do you impose your conventions on my code? |
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428 |
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For some reason people keep thinking that C<common::sense> imposes |
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process-wide limits, even though the SYNOPSIS makes it clear that it works |
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like other similar modules - i.e. only within the scope that C<use>s them. |
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432 |
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So, no, we don't - nobody is forced to use this module, and using a module |
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that relies on common::sense does not impose anything on you. |
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=item Why do you think only your notion of common::sense is valid? |
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437 |
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Well, we don't, and have clearly written this in the documentation to |
438 |
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every single release. We were just faster than anybody else w.r.t. to |
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grabbing the namespace. |
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=item But everybody knows that you have to use strict and use warnings, |
442 |
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why do you disable them? |
443 |
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444 |
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Well, we don't do this either - we selectively disagree with the |
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usefulness of some warnings over others. This module is aimed at |
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experienced Perl programmers, not people migrating from other languages |
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who might be surprised about stuff such as C<undef>. On the other hand, |
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this does not exclude the usefulness of this module for total newbies, due |
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to its strictness in enforcing policy, while at the same time not limiting |
450 |
root |
1.7 |
the expressive power of perl. |
451 |
root |
1.1 |
|
452 |
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This module is considerably I<more> strict than the canonical C<use |
453 |
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strict; use warnings>, as it makes all its warnings fatal in nature, so |
454 |
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you can not get away with as many things as with the canonical approach. |
455 |
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456 |
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This was not implemented in version 1.0 because of the daunting number |
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of warning categories and the difficulty in getting exactly the set of |
458 |
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warnings you wish (i.e. look at the SYNOPSIS in how complicated it is to |
459 |
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get a specific set of warnings - it is not reasonable to put this into |
460 |
root |
1.3 |
every module, the maintenance effort would be enourmous). |
461 |
root |
1.1 |
|
462 |
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=item But many modules C<use strict> or C<use warnings>, so the memory |
463 |
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savings do not apply? |
464 |
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465 |
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I suddenly feel sad... |
466 |
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467 |
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But yes, that's true. Fortunately C<common::sense> still uses only a |
468 |
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miniscule amount of RAM. |
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=item But it adds another dependency to your modules! |
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It's a fact, yeah. But it's trivial to install, most popular modules have |
473 |
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many more dependencies and we consider dependencies a good thing - it |
474 |
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leads to better APIs, more thought about interworking of modules and so |
475 |
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on. |
476 |
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477 |
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=item Why do you use JSON and not YAML for your META.yml? |
478 |
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479 |
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This is not true - YAML supports a large subset of JSON, and this subset |
480 |
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is what META.yml is written in, so it would be correct to say "the |
481 |
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META.yml is written in a common subset of YAML and JSON". |
482 |
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483 |
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The META.yml follows the YAML, JSON and META.yml specifications, and is |
484 |
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correctly parsed by CPAN, so if you have trouble with it, the problem is |
485 |
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likely on your side. |
486 |
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487 |
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=item But! But! |
488 |
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489 |
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Yeah, we know. |
490 |
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491 |
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=back |
492 |
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493 |
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=head1 AUTHOR |
494 |
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495 |
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Marc Lehmann <schmorp@schmorp.de> |
496 |
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http://home.schmorp.de/ |
497 |
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498 |
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Robin Redeker, "<elmex at ta-sa.org>". |
499 |
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500 |
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=cut |
501 |
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|