.\" -*- mode: troff; coding: utf-8 -*- .\" Automatically generated by Pod::Man v6.0.2 (Pod::Simple 3.45) .\" .\" Standard preamble: .\" ======================================================================== .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Vb \" Begin verbatim text .ft CW .nf .ne \\$1 .. .de Ve \" End verbatim text .ft R .fi .. .\" \*(C` and \*(C' are quotes in nroff, nothing in troff, for use with C<>. .ie n \{\ . ds C` "" . ds C' "" 'br\} .el\{\ . ds C` . ds C' 'br\} .\" .\" Escape single quotes in literal strings from groff's Unicode transform. .ie \n(.g .ds Aq \(aq .el .ds Aq ' .\" .\" If the F register is >0, we'll generate index entries on stderr for .\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index .\" entries marked with X<> in POD. Of course, you'll have to process the .\" output yourself in some meaningful fashion. .\" .\" Avoid warning from groff about undefined register 'F'. .de IX .. .nr rF 0 .if \n(.g .if rF .nr rF 1 .if (\n(rF:(\n(.g==0)) \{\ . if \nF \{\ . de IX . tm Index:\\$1\t\\n%\t"\\$2" .. . if !\nF==2 \{\ . nr % 0 . nr F 2 . \} . \} .\} .rr rF .\" .\" Required to disable full justification in groff 1.23.0. .if n .ds AD l .\" ======================================================================== .\" .IX Title "strictures 3" .TH strictures 3 2025-12-14 "perl v5.42.0" "User Contributed Perl Documentation" .\" For nroff, turn off justification. Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH NAME strictures \- Turn on strict and make most warnings fatal .SH SYNOPSIS .IX Header "SYNOPSIS" .Vb 1 \& use strictures 2; .Ve .PP is equivalent to .PP .Vb 10 \& use strict; \& use warnings FATAL => \*(Aqall\*(Aq; \& use warnings NONFATAL => qw( \& exec \& recursion \& internal \& malloc \& newline \& experimental \& deprecated \& portable \& ); \& no warnings \*(Aqonce\*(Aq; .Ve .PP except when called from a file which matches: .PP .Vb 1 \& (caller)[1] =~ /^(?:t|xt|lib|blib)[\e\e\e/]/ .Ve .PP and when either \f(CW\*(C`.git\*(C'\fR, \f(CW\*(C`.svn\*(C'\fR, \f(CW\*(C`.hg\*(C'\fR, or \f(CW\*(C`.bzr\*(C'\fR is present in the current directory (with the intention of only forcing extra tests on the author side) \&\-\- or when \f(CW\*(C`.git\*(C'\fR, \f(CW\*(C`.svn\*(C'\fR, \f(CW\*(C`.hg\*(C'\fR, or \f(CW\*(C`.bzr\*(C'\fR is present two directories up along with \f(CW\*(C`dist.ini\*(C'\fR (which would indicate we are in a \f(CW\*(C`dzil test\*(C'\fR operation, via Dist::Zilla) \-\- or when the \f(CW\*(C`PERL_STRICTURES_EXTRA\*(C'\fR environment variable is set, in which case it also does the equivalent of .PP .Vb 3 \& no indirect \*(Aqfatal\*(Aq; \& no multidimensional; \& no bareword::filehandles; .Ve .PP Note that \f(CW\*(C`PERL_STRICTURES_EXTRA\*(C'\fR may at some point add even more tests, with only a minor version increase, but any changes to the effect of \f(CW\*(C`use strictures\*(C'\fR in normal mode will involve a major version bump. .PP If any of the extra testing modules are not present, strictures will complain loudly, once, via \f(CWwarn()\fR, and then shut up. But you really should consider installing them, they\*(Aqre all great anti\-footgun tools. .SH DESCRIPTION .IX Header "DESCRIPTION" I\*(Aqve been writing the equivalent of this module at the top of my code for about a year now. I figured it was time to make it shorter. .PP Things like the importer in \f(CW\*(C`use Moose\*(C'\fR don\*(Aqt help me because they turn warnings on but don\*(Aqt make them fatal \-\- which from my point of view is useless because I want an exception to tell me my code isn\*(Aqt warnings\-clean. .PP Any time I see a warning from my code, that indicates a mistake. .PP Any time my code encounters a mistake, I want a crash \-\- not spew to STDERR and then unknown (and probably undesired) subsequent behaviour. .PP I also want to ensure that obvious coding mistakes, like indirect object syntax (and not so obvious mistakes that cause things to accidentally compile as such) get caught, but not at the cost of an XS dependency and not at the cost of blowing things up on another machine. .PP Therefore, strictures turns on additional checking, but only when it thinks it\*(Aqs running in a test file in a VCS checkout \-\- although if this causes undesired behaviour this can be overridden by setting the \&\f(CW\*(C`PERL_STRICTURES_EXTRA\*(C'\fR environment variable. .PP If additional useful author side checks come to mind, I\*(Aqll add them to the \&\f(CW\*(C`PERL_STRICTURES_EXTRA\*(C'\fR code path only \-\- this will result in a minor version increase (e.g. 1.000000 to 1.001000 (1.1.0) or similar). Any fixes only to the mechanism of this code will result in a sub\-version increase (e.g. 1.000000 to 1.000001 (1.0.1)). .SH "CATEGORY SELECTIONS" .IX Header "CATEGORY SELECTIONS" strictures does not enable fatal warnings for all categories. .IP exec 4 .IX Item "exec" Includes a warning that can cause your program to continue running unintentionally after an internal fork. Not safe to fatalize. .IP recursion 4 .IX Item "recursion" Infinite recursion will end up overflowing the stack eventually anyway. .IP internal 4 .IX Item "internal" Triggers deep within perl, in places that are not safe to trap. .IP malloc 4 .IX Item "malloc" Triggers deep within perl, in places that are not safe to trap. .IP newline 4 .IX Item "newline" Includes a warning for using stat on a valid but suspect filename, ending in a newline. .IP experimental 4 .IX Item "experimental" Experimental features are used intentionally. .IP deprecated 4 .IX Item "deprecated" Deprecations will inherently be added to in the future in unexpected ways, so making them fatal won\*(Aqt be reliable. .IP portable 4 .IX Item "portable" Doesn\*(Aqt indicate an actual problem with the program, only that it may not behave properly if run on a different machine. .IP once 4 .IX Item "once" Can\*(Aqt be fatalized. Also triggers very inconsistently, so we just disable it. .SH VERSIONS .IX Header "VERSIONS" Depending on the version of strictures requested, different warnings will be enabled. If no specific version is requested, the current version\*(Aqs behavior will be used. Versions can be requested using perl\*(Aqs standard mechanism: .PP .Vb 1 \& use strictures 2; .Ve .PP Or, by passing in a \f(CW\*(C`version\*(C'\fR option: .PP .Vb 1 \& use strictures version => 2; .Ve .SS "VERSION 2" .IX Subsection "VERSION 2" Equivalent to: .PP .Vb 10 \& use strict; \& use warnings FATAL => \*(Aqall\*(Aq; \& use warnings NONFATAL => qw( \& exec \& recursion \& internal \& malloc \& newline \& experimental \& deprecated \& portable \& ); \& no warnings \*(Aqonce\*(Aq; \& \& # and if in dev mode: \& no indirect \*(Aqfatal\*(Aq; \& no multidimensional; \& no bareword::filehandles; .Ve .PP Additionally, any warnings created by modules using warnings::register or \&\f(CWwarnings::register_categories()\fR will not be fatalized. .SS "VERSION 1" .IX Subsection "VERSION 1" Equivalent to: .PP .Vb 6 \& use strict; \& use warnings FATAL => \*(Aqall\*(Aq; \& # and if in dev mode: \& no indirect \*(Aqfatal\*(Aq; \& no multidimensional; \& no bareword::filehandles; .Ve .SH METHODS .IX Header "METHODS" .SS import .IX Subsection "import" This method does the setup work described above in "DESCRIPTION". Optionally accepts a \f(CW\*(C`version\*(C'\fR option to request a specific version\*(Aqs behavior. .SS VERSION .IX Subsection "VERSION" This method traps the \f(CW\*(C`strictures\->VERSION(1)\*(C'\fR call produced by a use line with a version number on it and does the version check. .SH "EXTRA TESTING RATIONALE" .IX Header "EXTRA TESTING RATIONALE" Every so often, somebody complains that they\*(Aqre deploying via \f(CW\*(C`git pull\*(C'\fR and that they don\*(Aqt want strictures to enable itself in this case \-\- and that setting \f(CW\*(C`PERL_STRICTURES_EXTRA\*(C'\fR to 0 isn\*(Aqt acceptable (additional ways to disable extra testing would be welcome but the discussion never seems to get that far). .PP In order to allow us to skip a couple of stages and get straight to a productive conversation, here\*(Aqs my current rationale for turning the extra testing on via a heuristic: .PP The extra testing is all stuff that only ever blows up at compile time; this is intentional. So the oft\-raised concern that it\*(Aqs different code being tested is only sort of the case \-\- none of the modules involved affect the final optree to my knowledge, so the author gets some additional compile time crashes which he/she then fixes, and the rest of the testing is completely valid for all environments. .PP The point of the extra testing \-\- especially \f(CW\*(C`no indirect\*(C'\fR \-\- is to catch mistakes that newbie users won\*(Aqt even realise are mistakes without help. For example, .PP .Vb 1 \& foo { ... }; .Ve .PP where foo is an & prototyped sub that you forgot to import \-\- this is pernicious to track down since all \fIseems\fR fine until it gets called and you get a crash. Worse still, you can fail to have imported it due to a circular require, at which point you have a load order dependent bug which I\*(Aqve seen before now \fIonly\fR show up in production due to tiny differences between the production and the development environment. I wrote to explain this particular problem before strictures itself existed. .PP As such, in my experience so far strictures\*(Aq extra testing has \&\fIavoided\fR production versus development differences, not caused them. .PP Additionally, strictures\*(Aq policy is very much "try and provide as much protection as possible for newbies \-\- who won\*(Aqt think about whether there\*(Aqs an option to turn on or not" \-\- so having only the environment variable is not sufficient to achieve that (I get to explain that you need to add \&\f(CW\*(C`use strict\*(C'\fR at least once a week on freenode #perl \-\- newbies sometimes completely skip steps because they don\*(Aqt understand that that step is important). .PP I make no claims that the heuristic is perfect \-\- it\*(Aqs already been evolved significantly over time, especially for 1.004 where we changed things to ensure it only fires on files in your checkout (rather than strictures\-using modules you happened to have installed, which was just silly). However, I hope the above clarifies why a heuristic approach is not only necessary but desirable from a point of view of providing new users with as much safety as possible, and will allow any future discussion on the subject to focus on "how do we minimise annoyance to people deploying from checkouts intentionally". .SH "SEE ALSO" .IX Header "SEE ALSO" .IP \(bu 4 indirect .IP \(bu 4 multidimensional .IP \(bu 4 bareword::filehandles .SH "COMMUNITY AND SUPPORT" .IX Header "COMMUNITY AND SUPPORT" .SS "IRC channel" .IX Subsection "IRC channel" irc.perl.org #toolchain .PP (or bug \*(Aqmst\*(Aq in query on there or freenode) .SS "Git repository" .IX Subsection "Git repository" Gitweb is on http://git.shadowcat.co.uk/ and the clone URL is: .PP .Vb 1 \& git clone git://git.shadowcat.co.uk/p5sagit/strictures.git .Ve .PP The web interface to the repository is at: .PP .Vb 1 \& http://git.shadowcat.co.uk/gitweb/gitweb.cgi?p=p5sagit/strictures.git .Ve .SH AUTHOR .IX Header "AUTHOR" mst \- Matt S. Trout (cpan:MSTROUT) .SH CONTRIBUTORS .IX Header "CONTRIBUTORS" Karen Etheridge (cpan:ETHER) .PP Mithaldu \- Christian Walde (cpan:MITHALDU) .PP haarg \- Graham Knop (cpan:HAARG) .SH COPYRIGHT .IX Header "COPYRIGHT" Copyright (c) 2010 the strictures "AUTHOR" and "CONTRIBUTORS" as listed above. .SH LICENSE .IX Header "LICENSE" This library is free software and may be distributed under the same terms as perl itself.