forked from beyondgrep/ack1
/
Ack.pm
1470 lines (1135 loc) · 40.9 KB
/
Ack.pm
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package App::Ack;
use warnings;
use strict;
use File::Next 0.40;
use App::Ack::Repository;
=head1 NAME
App::Ack - A container for functions for the ack program
=head1 VERSION
Version 1.86
=cut
our $VERSION;
our $COPYRIGHT;
BEGIN {
$VERSION = '1.86';
$COPYRIGHT = 'Copyright 2005-2008 Andy Lester, all rights reserved.';
}
our $fh;
BEGIN {
$fh = *STDOUT;
}
our %types;
our %type_wanted;
our %mappings;
our %ignore_dirs;
our $dir_sep_chars;
our $is_cygwin;
our $is_windows;
our $to_screen;
use File::Spec ();
use File::Glob ':glob';
use Getopt::Long ();
BEGIN {
%ignore_dirs = (
'.bzr' => 'Bazaar',
'.cdv' => 'Codeville',
'~.dep' => 'Interface Builder',
'~.dot' => 'Interface Builder',
'~.nib' => 'Interface Builder',
'~.plst' => 'Interface Builder',
'.git' => 'Git',
'.hg' => 'Mercurial',
'.pc' => 'quilt',
'.svn' => 'Subversion',
blib => 'Perl module building',
CVS => 'CVS',
RCS => 'RCS',
SCCS => 'SCCS',
_darcs => 'darcs',
_sgbak => 'Vault/Fortress',
'autom4te.cache' => 'autoconf',
'cover_db' => 'Devel::Cover',
_build => 'Module::Build',
);
%mappings = (
actionscript => [qw( as mxml )],
asm => [qw( asm s )],
batch => [qw( bat cmd )],
binary => q{Binary files, as defined by Perl's -B op (default: off)},
cc => [qw( c h xs )],
cfmx => [qw( cfc cfm cfml )],
cpp => [qw( cpp cc cxx m hpp hh h hxx )],
csharp => [qw( cs )],
css => [qw( css )],
elisp => [qw( el )],
erlang => [qw( erl )],
fortran => [qw( f f77 f90 f95 f03 for ftn fpp )],
haskell => [qw( hs lhs )],
hh => [qw( h )],
html => [qw( htm html shtml xhtml )],
java => [qw( java properties )],
js => [qw( js )],
jsp => [qw( jsp jspx jhtm jhtml )],
lisp => [qw( lisp lsp )],
lua => [qw( lua )],
make => q{Makefiles},
mason => [qw( mas mhtml mpl mtxt )],
objc => [qw( m h )],
objcpp => [qw( mm h )],
ocaml => [qw( ml mli )],
parrot => [qw( pir pasm pmc ops pod pg tg )],
perl => [qw( pl pm pod t )],
php => [qw( php phpt php3 php4 php5 )],
plone => [qw( pt cpt metadata cpy py )],
python => [qw( py )],
ruby => [qw( rb rhtml rjs rxml erb )],
scheme => [qw( scm )],
shell => [qw( sh bash csh tcsh ksh zsh )],
skipped => q{Files, but not directories, normally skipped by ack (default: off)},
smalltalk => [qw( st )],
sql => [qw( sql ctl )],
tcl => [qw( tcl itcl itk )],
tex => [qw( tex cls sty )],
text => q{Text files, as defined by Perl's -T op (default: off)},
tt => [qw( tt tt2 ttml )],
vb => [qw( bas cls frm ctl vb resx )],
vim => [qw( vim )],
yaml => [qw( yaml yml )],
xml => [qw( xml dtd xslt ent )],
);
while ( my ($type,$exts) = each %mappings ) {
if ( ref $exts ) {
for my $ext ( @{$exts} ) {
push( @{$types{$ext}}, $type );
}
}
}
$is_cygwin = ($^O eq 'cygwin');
$is_windows = ($^O =~ /MSWin32/);
$to_screen = -t *STDOUT;
$dir_sep_chars = $is_windows ? quotemeta( '\\/' ) : quotemeta( File::Spec->catfile( '', '' ) );
}
=head1 SYNOPSIS
If you want to know about the F<ack> program, see the F<ack> file itself.
No user-serviceable parts inside. F<ack> is all that should use this.
=head1 FUNCTIONS
=head2 read_ackrc
Reads the contents of the .ackrc file and returns the arguments.
=cut
sub read_ackrc {
my @files = ( $ENV{ACKRC} );
my @dirs =
$is_windows
? ( $ENV{HOME}, $ENV{USERPROFILE} )
: ( '~', $ENV{HOME} );
for my $dir ( grep { defined } @dirs ) {
for my $file ( '.ackrc', '_ackrc' ) {
push( @files, bsd_glob( "$dir/$file", GLOB_TILDE ) );
}
}
for my $filename ( @files ) {
if ( defined $filename && -e $filename ) {
open( my $fh, '<', $filename ) or App::Ack::die( "$filename: $!\n" );
my @lines = grep { /./ && !/^\s*#/ } <$fh>;
chomp @lines;
close $fh or App::Ack::die( "$filename: $!\n" );
return @lines;
}
}
return;
}
=head2 get_command_line_options()
Gets command-line arguments and does the Ack-specific tweaking.
=cut
sub get_command_line_options {
my %opt = (
pager => $ENV{ACK_PAGER_COLOR} || $ENV{ACK_PAGER},
);
my $getopt_specs = {
1 => sub { $opt{1} = $opt{m} = 1 },
'A|after-context=i' => \$opt{after_context},
'B|before-context=i' => \$opt{before_context},
'C|context:i' => sub { shift; my $val = shift; $opt{before_context} = $opt{after_context} = ($val || 2) },
'a|all-types' => \$opt{all},
'break!' => \$opt{break},
c => \$opt{count},
'color|colour!' => \$opt{color},
count => \$opt{count},
'env!' => sub { }, # ignore this option, it is handled beforehand
f => \$opt{f},
flush => \$opt{flush},
'follow!' => \$opt{follow},
'g=s' => sub { shift; $opt{G} = shift; $opt{f} = 1 },
'G=s' => \$opt{G},
'group!' => sub { shift; $opt{heading} = $opt{break} = shift },
'heading!' => \$opt{heading},
'h|no-filename' => \$opt{h},
'H|with-filename' => \$opt{H},
'i|ignore-case' => \$opt{i},
'lines=s' => sub { shift; my $val = shift; push @{$opt{lines}}, $val },
'l|files-with-matches' => \$opt{l},
'L|files-without-match' => sub { $opt{l} = $opt{v} = 1 },
'm|max-count=i' => \$opt{m},
'match=s' => \$opt{regex},
n => \$opt{n},
o => sub { $opt{output} = '$&' },
'output=s' => \$opt{output},
'pager=s' => \$opt{pager},
'nopager' => sub { $opt{pager} = undef },
'passthru' => \$opt{passthru},
'print0' => \$opt{print0},
'Q|literal' => \$opt{Q},
'smart-case!' => \$opt{smart_case},
'sort-files' => \$opt{sort_files},
'u|unrestricted' => \$opt{u},
'v|invert-match' => \$opt{v},
'w|word-regexp' => \$opt{w},
'ignore-dirs=s' => sub { shift; my $dir = remove_dir_sep( shift ); $ignore_dirs{$dir} = '--ignore-dirs' },
'noignore-dirs=s' => sub { shift; my $dir = remove_dir_sep( shift ); delete $ignore_dirs{$dir} },
'version' => sub { print_version_statement(); exit 1; },
'help|?:s' => sub { shift; show_help(@_); exit; },
'help-types'=> sub { show_help_types(); exit; },
'man' => sub { require Pod::Usage; Pod::Usage::pod2usage({-verbose => 2}); exit; },
'type=s' => sub {
# Whatever --type=xxx they specify, set it manually in the hash
my $dummy = shift;
my $type = shift;
my $wanted = ($type =~ s/^no//) ? 0 : 1; # must not be undef later
if ( exists $type_wanted{ $type } ) {
$type_wanted{ $type } = $wanted;
}
else {
App::Ack::die( qq{Unknown --type "$type"} );
}
}, # type sub
};
# Stick any default switches at the beginning, so they can be overridden
# by the command line switches.
unshift @ARGV, split( ' ', $ENV{ACK_OPTIONS} ) if defined $ENV{ACK_OPTIONS};
# first pass through options, looking for type definitions
def_types_from_ARGV();
for my $i ( filetypes_supported() ) {
$getopt_specs->{ "$i!" } = \$type_wanted{ $i };
}
my $parser = Getopt::Long::Parser->new();
$parser->configure( 'bundling', 'no_ignore_case', );
$parser->getoptions( %{$getopt_specs} ) or
App::Ack::die( 'See ack --help or ack --man for options.' );
my %defaults = (
all => 0,
color => $to_screen,
follow => 0,
break => $to_screen,
heading => $to_screen,
before_context => 0,
after_context => 0,
);
if ( $is_windows && $defaults{color} && not $ENV{ACK_PAGER_COLOR} ) {
if ( $ENV{ACK_PAGER} || not eval { require Win32::Console::ANSI } ) {
$defaults{color} = 0;
}
}
if ( $to_screen && $ENV{ACK_PAGER_COLOR} ) {
$defaults{color} = 1;
}
while ( my ($key,$value) = each %defaults ) {
if ( not defined $opt{$key} ) {
$opt{$key} = $value;
}
}
if ( defined $opt{m} && $opt{m} <= 0 ) {
App::Ack::die( '-m must be greater than zero' );
}
for ( qw( before_context after_context ) ) {
if ( defined $opt{$_} && $opt{$_} < 0 ) {
App::Ack::die( "--$_ may not be negative" );
}
}
if ( defined( my $val = $opt{output} ) ) {
$opt{output} = eval qq[ sub { "$val" } ];
}
if ( defined( my $l = $opt{lines} ) ) {
# --line=1 --line=5 is equivalent to --line=1,5
my @lines = split( /,/, join( ',', @{$l} ) );
# --line=1-3 is equivalent to --line=1,2,3
@lines = map {
my @ret;
if ( /-/ ) {
my ($from, $to) = split /-/, $_;
if ( $from > $to ) {
App::Ack::warn( "ignoring --line=$from-$to" );
@ret = ();
}
else {
@ret = ( $from .. $to );
}
}
else {
@ret = ( $_ );
};
@ret
} @lines;
if ( @lines ) {
my %uniq;
@uniq{ @lines } = ();
$opt{lines} = [ sort { $a <=> $b } keys %uniq ]; # numerical sort and each line occurs only once!
}
else {
# happens if there are only ignored --line directives
App::Ack::die( 'All --line options are invalid.' );
}
}
return \%opt;
}
=head2 def_types_from_ARGV
Go through the command line arguments and look for
I<--type-set foo=.foo,.bar> and I<--type-add xml=.rdf>.
Remove them from @ARGV and add them to the supported filetypes,
i.e. into %mappings, etc.
=cut
sub def_types_from_ARGV {
my @typedef;
my $parser = Getopt::Long::Parser->new();
# pass_through => leave unrecognized command line arguments alone
# no_auto_abbrev => otherwise -c is expanded and not left alone
$parser->configure( 'no_ignore_case', 'pass_through', 'no_auto_abbrev' );
$parser->getoptions(
'type-set=s' => sub { shift; push @typedef, ['c', shift] },
'type-add=s' => sub { shift; push @typedef, ['a', shift] },
) or App::Ack::die( 'See ack --help or ack --man for options.' );
for my $td (@typedef) {
my ($type, $ext) = split /=/, $td->[1];
if ( $td->[0] eq 'c' ) {
# type-set
if ( exists $mappings{$type} ) {
# can't redefine types 'make', 'skipped', 'text' and 'binary'
App::Ack::die( qq{--type-set: Builtin type "$type" cannot be changed.} )
if ref $mappings{$type} ne 'ARRAY';
delete_type($type);
}
}
else {
# type-add
# can't append to types 'make', 'skipped', 'text' and 'binary'
App::Ack::die( qq{--type-add: Builtin type "$type" cannot be changed.} )
if exists $mappings{$type} && ref $mappings{$type} ne 'ARRAY';
App::Ack::warn( qq{--type-add: Type "$type" does not exist, creating with "$ext" ...} )
unless exists $mappings{$type};
}
my @exts = split /,/, $ext;
s/^\.// for @exts;
if ( !exists $mappings{$type} || ref($mappings{$type}) eq 'ARRAY' ) {
push @{$mappings{$type}}, @exts;
for my $e ( @exts ) {
push @{$types{$e}}, $type;
}
}
else {
App::Ack::die( qq{Cannot append to type "$type".} );
}
}
return;
}
=head2 delete_type
Removes a type from the internal structures containing type
information: %mappings, %types and %type_wanted.
=cut
sub delete_type {
my $type = shift;
App::Ack::die( qq{Internal error: Cannot delete builtin type "$type".} )
unless ref $mappings{$type} eq 'ARRAY';
delete $mappings{$type};
delete $type_wanted{$type};
for my $ext ( keys %types ) {
$types{$ext} = [ grep { $_ ne $type } @{$types{$ext}} ];
}
}
=head2 ignoredir_filter
Standard filter to pass as a L<File::Next> descend_filter. It
returns true if the directory is any of the ones we know we want
to ignore.
=cut
sub ignoredir_filter {
return !exists $ignore_dirs{$_};
}
=head2 remove_dir_sep( $path )
This functions removes a trailing path separator, if there is one, from its argument
=cut
sub remove_dir_sep {
my $path = shift;
$path =~ s/[$dir_sep_chars]$//;
return $path;
}
=head2 filetypes( $filename )
Returns a list of types that I<$filename> could be. For example, a file
F<foo.pod> could be "perl" or "parrot".
The filetype will be C<undef> if we can't determine it. This could
be if the file doesn't exist, or it can't be read.
It will be 'skipped' if it's something that ack should avoid searching,
even under -a.
=cut
use constant TEXT => 'text';
sub filetypes {
my $filename = shift;
return 'skipped' unless is_searchable( $filename );
return ('make',TEXT) if $filename =~ m{[$dir_sep_chars]?Makefile$}io;
# If there's an extension, look it up
if ( $filename =~ m{\.([^\.$dir_sep_chars]+)$}o ) {
my $ref = $types{lc $1};
return (@{$ref},TEXT) if $ref;
}
# At this point, we can't tell from just the name. Now we have to
# open it and look inside.
return unless -e $filename;
# From Elliot Shank:
# I can't see any reason that -r would fail on these-- the ACLs look
# fine, and no program has any of them open, so the busted Windows
# file locking model isn't getting in there. If I comment the if
# statement out, everything works fine
# So, for cygwin, don't bother trying to check for readability.
if ( !$is_cygwin ) {
if ( !-r $filename ) {
App::Ack::warn( "$filename: Permission denied" );
return;
}
}
return 'binary' if -B $filename;
# If there's no extension, or we don't recognize it, check the shebang line
my $fh;
if ( !open( $fh, '<', $filename ) ) {
App::Ack::warn( "$filename: $!" );
return;
}
my $header = <$fh>;
close $fh or App::Ack::warn( "$filename: $!\n" );
if ( $header =~ /^#!/ ) {
return ($1,TEXT) if $header =~ /\b(ruby|p(?:erl|hp|ython))\b/;
return ('shell',TEXT) if $header =~ /\b(?:ba|t?c|k|z)?sh\b/;
}
else {
return ('xml',TEXT) if $header =~ /\Q<?xml /i;
}
return (TEXT);
}
=head2 is_searchable( $filename )
Returns true if the filename is one that we can search, and false
if it's one that we should skip like a coredump or a backup file.
Recognized files:
/~$/ - Unix backup files
/#.+#$/ - Emacs swap files
/[._].*\.swp$/ - Vi(m) swap files
/core\.\d+$/ - core dumps
=cut
sub is_searchable {
my $filename = shift;
# If these are updated, update the --help message
return if $filename =~ /[.]bak$/;
return if $filename =~ /~$/;
return if $filename =~ m{[$dir_sep_chars]?(?:#.+#|core\.\d+|[._].*\.swp)$}o;
return 1;
}
=head2 build_regex( $str, \%opts )
Returns a regex object based on a string and command-line options.
=cut
sub build_regex {
my $str = shift;
my $opt = shift;
$str = quotemeta( $str ) if $opt->{Q};
if ( $opt->{w} ) {
$str = "\\b$str" if $str =~ /^\w/;
$str = "$str\\b" if $str =~ /\w$/;
}
my $regex_is_lc = $str eq lc $str;
if ( $opt->{i} || ($opt->{smart_case} && $regex_is_lc) ) {
$str = "(?i)$str";
}
return $str;
}
=head2 check_regex( $regex_str )
Checks that the $regex_str can be compiled into a perl regular expression.
Dies with the error message if this is not the case.
No return value.
=cut
sub check_regex {
my $regex = shift;
return unless defined $regex;
eval { qr/$regex/ };
if ($@) {
(my $error = $@) =~ s/ at \S+ line \d+.*//;
chomp($error);
App::Ack::die( "Invalid regex '$regex':\n $error" );
}
return;
}
=head2 warn( @_ )
Put out an ack-specific warning.
=cut
sub warn { ## no critic (ProhibitBuiltinHomonyms)
return CORE::warn( _my_program(), ': ', @_, "\n" );
}
=head2 die( @_ )
Die in an ack-specific way.
=cut
sub die { ## no critic (ProhibitBuiltinHomonyms)
return CORE::die( _my_program(), ': ', @_, "\n" );
}
sub _my_program {
require File::Basename;
return File::Basename::basename( $0 );
}
=head2 filetypes_supported()
Returns a list of all the types that we can detect.
=cut
sub filetypes_supported {
return keys %mappings;
}
sub _get_thpppt {
my $y = q{_ /|,\\'!.x',=(www)=, U };
$y =~ tr/,x!w/\nOo_/;
return $y;
}
sub _thpppt {
my $y = _get_thpppt();
App::Ack::print( "$y ack $_[0]!\n" );
exit 0;
}
sub _key {
my $str = lc shift;
$str =~ s/[^a-z]//g;
return $str;
}
=head2 show_help()
Dumps the help page to the user.
=cut
sub show_help {
my $help_arg = shift || 0;
return show_help_types() if $help_arg =~ /^types?/;
my $ignore_dirs = _listify( sort { _key($a) cmp _key($b) } keys %ignore_dirs );
App::Ack::print( <<"END_OF_HELP" );
Usage: ack [OPTION]... PATTERN [FILES]
Search for PATTERN in each source file in the tree from cwd on down.
If [FILES] is specified, then only those files/directories are checked.
ack may also search STDIN, but only if no FILES are specified, or if
one of FILES is "-".
Default switches may be specified in ACK_OPTIONS environment variable or
an .ackrc file. If you want no dependency on the environment, turn it
off with --noenv.
Example: ack -i select
Searching:
-i, --ignore-case Ignore case distinctions in PATTERN
--[no]smart-case Ignore case distinctions in PATTERN,
only if PATTERN contains no upper case
Ignored if -i is specified
-v, --invert-match Invert match: select non-matching lines
-w, --word-regexp Force PATTERN to match only whole words
-Q, --literal Quote all metacharacters; PATTERN is literal
Search output:
--line=NUM Only print line(s) NUM of each file
-l, --files-with-matches
Only print filenames containing matches
-L, --files-without-match
Only print filenames with no match
-o Show only the part of a line matching PATTERN
(turns off text highlighting)
--passthru Print all lines, whether matching or not
--output=expr Output the evaluation of expr for each line
(turns off text highlighting)
--match PATTERN Specify PATTERN explicitly.
-m, --max-count=NUM Stop searching in each file after NUM matches
-1 Stop searching after one match of any kind
-H, --with-filename Print the filename for each match
-h, --no-filename Suppress the prefixing filename on output
-c, --count Show number of lines matching per file
-A NUM, --after-context=NUM
Print NUM lines of trailing context after matching
lines.
-B NUM, --before-context=NUM
Print NUM lines of leading context before matching
lines.
-C [NUM], --context[=NUM]
Print NUM lines (default 2) of output context.
--print0 Print null byte as separator between filenames,
only works with -f, -g, -l, -L or -c.
File presentation:
--pager=COMMAND Pipes all ack output through COMMAND.
Ignored if output is redirected.
--nopager Do not send output through a pager. Cancels any
setting in ~/.ackrc, ACK_PAGER or ACK_PAGER_COLOR.
--[no]heading Print a filename heading above each file's results.
(default: on when used interactively)
--[no]break Print a break between results from different files.
(default: on when used interactively)
--group Same as --heading --break
--nogroup Same as --noheading --nobreak
--[no]color Highlight the matching text (default: on unless
output is redirected, or on Windows)
--[no]colour Same as --[no]color
--flush Flush output immediately, even when ack is used
non-interactively (when output goes to a pipe or
file).
File finding:
-f Only print the files found, without searching.
The PATTERN must not be specified.
-g REGEX Same as -f, but only print files matching REGEX.
--sort-files Sort the found files lexically.
File inclusion/exclusion:
-a, --all-types All file types searched;
Ignores CVS, .svn and other ignored directories
-u, --unrestricted All files and directories searched
--[no]ignore-dir=name Add/Remove directory from the list of ignored dirs
-n No descending into subdirectories
-G REGEX Only search files that match REGEX
--perl Include only Perl files.
--type=perl Include only Perl files.
--noperl Exclude Perl files.
--type=noperl Exclude Perl files.
See "ack --help type" for supported filetypes.
--type-set TYPE=.EXTENSION[,.EXT2[,...]]
Files with the given EXTENSION(s) are recognized as
being of type TYPE. This replaces an existing
definition for type TYPE.
--type-add TYPE=.EXTENSION[,.EXT2[,...]]
Files with the given EXTENSION(s) are recognized as
being of (the existing) type TYPE
--[no]follow Follow symlinks. Default is off.
Directories ignored by default:
$ignore_dirs
Files not checked for type:
/~\$/ - Unix backup files
/#.+#\$/ - Emacs swap files
/[._].*\\.swp\$/ - Vi(m) swap files
/core\\.\\d+\$/ - core dumps
Miscellaneous:
--noenv Ignore environment variables and ~/.ackrc
--help This help
--man Man page
--version Display version & copyright
--thpppt Bill the Cat
This is version $VERSION of ack.
END_OF_HELP
return;
}
=head2 show_help_types()
Display the filetypes help subpage.
=cut
sub show_help_types {
App::Ack::print( <<'END_OF_HELP' );
Usage: ack [OPTION]... PATTERN [FILES]
The following is the list of filetypes supported by ack. You can
specify a file type with the --type=TYPE format, or the --TYPE
format. For example, both --type=perl and --perl work.
Note that some extensions may appear in multiple types. For example,
.pod files are both Perl and Parrot.
END_OF_HELP
my @types = filetypes_supported();
my $maxlen = 0;
for ( @types ) {
$maxlen = length if $maxlen < length;
}
for my $type ( sort @types ) {
next if $type =~ /^-/; # Stuff to not show
my $ext_list = $mappings{$type};
if ( ref $ext_list ) {
$ext_list = join( ' ', map { ".$_" } @{$ext_list} );
}
App::Ack::print( sprintf( " --[no]%-*.*s %s\n", $maxlen, $maxlen, $type, $ext_list ) );
}
return;
}
sub _listify {
my @whats = @_;
return '' if !@whats;
my $end = pop @whats;
my $str = @whats ? join( ', ', @whats ) . " and $end" : $end;
no warnings 'once';
require Text::Wrap;
$Text::Wrap::columns = 75;
return Text::Wrap::wrap( '', ' ', $str );
}
=head2 get_version_statement
Returns the version information for ack.
=cut
sub get_version_statement {
my $copyright = get_copyright();
return <<"END_OF_VERSION";
ack $VERSION
$copyright
This program is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
END_OF_VERSION
}
=head2 print_version_statement
Prints the version information for ack.
=cut
sub print_version_statement {
App::Ack::print( get_version_statement() );
return;
}
=head2 get_copyright
Return the copyright for ack.
=cut
sub get_copyright {
return $COPYRIGHT;
}
=head2 load_colors
Set default colors, load Term::ANSIColor
=cut
sub load_colors {
eval 'use Term::ANSIColor ()';
$ENV{ACK_COLOR_MATCH} ||= 'black on_yellow';
$ENV{ACK_COLOR_FILENAME} ||= 'bold green';
return;
}
=head2 is_interesting
File type filter, filtering based on the wanted file types
=cut
sub is_interesting {
return if /^\./;
my $include;
for my $type ( filetypes( $File::Next::name ) ) {
if ( defined $type_wanted{$type} ) {
if ( $type_wanted{$type} ) {
$include = 1;
}
else {
return;
}
}
}
return $include;
}
=head2 needs_line_scan( $fh, $regex, \%opts )
Slurp up an entire file up to 100K, see if there are any matches
in it, and if so, let us know so we can iterate over it directly.
If it's bigger than 100K or the match is inverted, we have to do
the line-by-line, too.
=cut
sub needs_line_scan {
my $fh = shift;
my $regex = shift;
my $opt = shift;
return 1 if $opt->{v};
my $size = -s $fh;
if ( $size > 100_000 ) {
return 1;
}
my $buffer;
my $rc = sysread( $fh, $buffer, $size );
return 0 unless $rc && ( $rc == $size );
return $buffer =~ /$regex/m;
}
# print subs added in order to make it easy for a third party
# module (such as App::Wack) to redefine the display methods
# and show the results in a different way.
sub print { print {$fh} @_ }
sub print_first_filename { App::Ack::print( $_[0], "\n" ) }
sub print_blank_line { App::Ack::print( "\n" ) }
sub print_separator { App::Ack::print( "--\n" ) }
sub print_filename { App::Ack::print( $_[0], $_[1] ) }
sub print_line_no { App::Ack::print( $_[0], $_[1] ) }
sub print_count {
my $filename = shift;
my $nmatches = shift;
my $ors = shift;
my $count = shift;
App::Ack::print( $filename );
App::Ack::print( ':', $nmatches ) if $count;
App::Ack::print( $ors );
}
sub print_count0 {
my $filename = shift;
my $ors = shift;
App::Ack::print( $filename, ':0', $ors );
}
=head2 search_resource( $res, \%opt )
Main search method
=cut
{
my $filename;
my $regex;
my $display_filename;
my $keep_context;
my $last_output_line; # number of the last line that has been output
my $any_output; # has there been any output for the current file yet
my $context_overall_output_count; # has there been any output at all
sub search_resource {
my $res = shift;
my $opt = shift;
my $v = $opt->{v};
my $passthru = $opt->{passthru};
my $max = $opt->{m};
my $nmatches = 0;
$filename = $res->name;
$display_filename = undef;
# for --line processing
my $has_lines = 0;
my @lines;
if ( defined $opt->{lines} ) {
$has_lines = 1;
@lines = ( @{$opt->{lines}}, -1 );
undef $regex; # Don't match when printing matching line