.\" Automatically generated by Pod::Man 4.10 (Pod::Simple 3.35) .\" .\" 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 .. .\" Set up some character translations and predefined strings. \*(-- will .\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left .\" double quote, and \*(R" will give a right double quote. \*(C+ will .\" give a nicer C++. Capital omega is used to do unbreakable dashes and .\" therefore won't be available. \*(C` and \*(C' expand to `' in nroff, .\" nothing in troff, for use with C<>. .tr \(*W- .ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p' .ie n \{\ . ds -- \(*W- . ds PI pi . if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch . if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch . ds L" "" . ds R" "" . ds C` "" . ds C' "" 'br\} .el\{\ . ds -- \|\(em\| . ds PI \(*p . ds L" `` . ds R" '' . 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 .\" ======================================================================== .\" .IX Title "File::ChangeNotify::Watcher 3pm" .TH File::ChangeNotify::Watcher 3pm "2019-01-10" "perl v5.28.1" "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" File::ChangeNotify::Watcher \- Role consumed by all watchers .SH "VERSION" .IX Header "VERSION" version 0.31 .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 7 \& my $watcher = \& File::ChangeNotify\->instantiate_watcher \& ( directories => [ \*(Aq/my/path\*(Aq, \*(Aq/my/other\*(Aq ], \& filter => qr/\e.(?:pm|conf|yml)$/, \& exclude => [\*(Aqt\*(Aq, \*(Aqroot\*(Aq, qr(/(?!\e.)[^/]+$), \& sub { \-e && ! \-r }], \& ); \& \& if ( my @events = $watcher\->new_events ) { ... } \& \& # blocking \& while ( my @events = $watcher\->wait_for_events ) { ... } .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" A \f(CW\*(C`File::ChangeNotify::Watcher\*(C'\fR monitors a directory for changes made to any file. You can provide a regular expression to filter out files you are not interested in. It handles the addition of new subdirectories by adding them to the watch list. .PP Note that the actual granularity of what each watcher class reports may vary. Implementations that hook into some sort of kernel event interface (Inotify, for example) have much better knowledge of exactly what changes are happening than one implemented purely in userspace code (like the Default class). .PP By default, events are returned in the form of File::ChangeNotify::Event objects, but this can be overridden by providing an \*(L"event_class\*(R" attribute to the constructor. .PP You can block while waiting for events or do a non-blocking call asking for any new events since the last call (or since the watcher was instantiated). Different watchers will implement blocking in different ways, and the Default watcher just does a sleep loop. .SH "METHODS" .IX Header "METHODS" .SS "File::ChangeNotify::Watcher::Subclass\->new(...)" .IX Subsection "File::ChangeNotify::Watcher::Subclass->new(...)" This method creates a new watcher. It accepts the following arguments: .IP "\(bu" 4 directories => \f(CW$path\fR .IP "\(bu" 4 directories => \e@paths .Sp This argument is required. It can be either one or many paths which should be watched for changes. .IP "\(bu" 4 filter => qr/.../ .Sp This is an optional regular expression that will be used to check if a file is of interest. This filter is only applied to files. .Sp By default, all files are included. .IP "\(bu" 4 exclude => [...] .Sp An optional arrayref of paths to exclude. This arrayref can contain plain strings, regular expressions, or subroutine references. If you provide a string it should contain the complete path to be excluded. .Sp If you provide a sub, it should return a true value for paths to be excluded e.g. \f(CW\*(C`exclude => [ sub { \-e && ! \-r } ],\*(C'\fR. The path will be passed as the first argument to the subroutine as well as in a localized \f(CW$_\fR. .Sp The paths can be either directories or specific files. If the exclusion matches a directory, all of its files and subdirectories are ignored. .IP "\(bu" 4 modify_includes_file_attributes .Sp This can either be a boolean or an arrayref. .Sp If it is an arrayref then it should contain paths for which you want information about changes to the file's attributes. This arrayref can contain plain strings, regular expressions, or subroutine references. If you provide a string it should contain the complete path to be excluded. .Sp When this matches a file, then modify events for that file will include information about the file's before and after permissions and ownership when these change. .Sp See the File::ChangeNotify::Event documentation for details on what this looks like. .IP "\(bu" 4 modify_includes_content .Sp This can either be a boolean or an arrayref. .Sp If it is an arrayref then it should contain paths for which you want to see past and current content for a file when it is modified. This arrayref can contain plain strings, regular expressions, or subroutine references. If you provide a string it should contain the complete path to be excluded. .Sp When this matches a file, then modify events for that file will include information about the file's before and after content when it changes. .Sp See the File::ChangeNotify::Event documentation for details on what this looks like. .IP "\(bu" 4 follow_symlinks => \f(CW$bool\fR .Sp By default, symlinks are ignored. Set this to true to follow them. .Sp If this symlinks are being followed, symlinks to files and directories will be followed. Directories will be watched, and changes for directories and files reported. .IP "\(bu" 4 sleep_interval => \f(CW$number\fR .Sp For watchers which call \f(CW\*(C`sleep\*(C'\fR to implement the \f(CW\*(C`$watcher\->wait_for_events\*(C'\fR method, this argument controls how long it sleeps for. The value is a number in seconds. .Sp The default is 2 seconds. .IP "\(bu" 4 event_class => \f(CW$class\fR .Sp This can be used to change the class used to report events. By default, this is File::ChangeNotify::Event. .ie n .SS "$watcher\->wait_for_events" .el .SS "\f(CW$watcher\fP\->wait_for_events" .IX Subsection "$watcher->wait_for_events" This method causes the watcher to block until it sees interesting events, and then return them as a list. .PP Some watcher subclasses may implement blocking as a sleep loop, while others may actually block. .ie n .SS "$watcher\->new_events" .el .SS "\f(CW$watcher\fP\->new_events" .IX Subsection "$watcher->new_events" This method returns a list of any interesting events seen since the last time the watcher checked. .ie n .SS "$watcher\->sees_all_events" .el .SS "\f(CW$watcher\fP\->sees_all_events" .IX Subsection "$watcher->sees_all_events" If this is true, the watcher will report on all events. .PP Some watchers, like the Default subclass, are not smart enough to track things like a file being created and then immediately deleted, and can only detect changes between snapshots of the file system. .PP Other watchers, like the Inotify subclass, see all events that happen and report on them. .SH "SUPPORT" .IX Header "SUPPORT" Bugs may be submitted at or via email to bug\-file\-changenotify@rt.cpan.org . .PP I am also usually active on \s-1IRC\s0 as 'autarch' on \f(CW\*(C`irc://irc.perl.org\*(C'\fR. .SH "SOURCE" .IX Header "SOURCE" The source code repository for File-ChangeNotify can be found at . .SH "AUTHOR" .IX Header "AUTHOR" Dave Rolsky .SH "COPYRIGHT AND LICENSE" .IX Header "COPYRIGHT AND LICENSE" This software is Copyright (c) 2009 \- 2019 by Dave Rolsky. .PP This is free software, licensed under: .PP .Vb 1 \& The Artistic License 2.0 (GPL Compatible) .Ve .PP The full text of the license can be found in the \&\fI\s-1LICENSE\s0\fR file included with this distribution.