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1 | use strict; |
2 | use warnings; |
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3 | package Devel::REPL::Plugin::Turtles; |
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4 | use Devel::REPL::Plugin; |
5 | |
6 | use Scalar::Util qw(reftype); |
7 | |
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8 | use namespace::autoclean; |
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9 | |
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10 | has default_command_prefix => ( |
11 | isa => "RegexpRef", |
12 | is => "rw", |
13 | default => sub { qr/\#/ }, |
14 | ); |
15 | |
16 | has turtles_matchers => ( |
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17 | traits => ['Array'], |
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18 | isa => "ArrayRef[RegexpRef|CodeRef]", |
19 | is => "rw", |
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20 | lazy => 1, |
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21 | default => sub { my $prefix = shift->default_command_prefix; [qr/^ $prefix (\w+) \s* (.*) /x] }, |
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22 | handles => { |
23 | add_turtles_matcher => 'unshift', |
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24 | }, |
25 | ); |
26 | |
27 | around 'formatted_eval' => sub { |
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28 | my $next = shift; |
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29 | my ($self, $line, @args) = @_; |
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30 | |
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31 | if ( my ( $command, @rest ) = $self->match_turtles($line) ) { |
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32 | my $method = "command_$command"; |
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33 | my $expr_method = "expr_$method"; |
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34 | |
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35 | if ( my $expr_code = $self->can($expr_method) ) { |
36 | if ( my $read_more = $self->can("continue_reading_if_necessary") ) { |
37 | push @rest, $self->$read_more(pop @rest); |
38 | } |
39 | $self->$expr_code($next, @rest); |
40 | } elsif ( my $cmd_code = $self->can($method) ) { |
41 | return $self->$cmd_code($next, @rest); |
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42 | } else { |
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43 | unless ( $line =~ /^\s*#/ ) { # special case for comments |
44 | return $self->format($self->error_return("REPL Error", "Command '$command' does not exist")); |
45 | } |
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46 | } |
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47 | } else { |
48 | return $self->$next($line, @args); |
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49 | } |
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50 | }; |
51 | |
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52 | sub match_turtles { |
53 | my ( $self, $line ) = @_; |
54 | |
55 | foreach my $thingy ( @{ $self->turtles_matchers } ) { |
56 | if ( reftype $thingy eq 'CODE' ) { |
57 | if ( my @res = $self->$thingy($line) ) { |
58 | return @res; |
59 | } |
60 | } else { |
61 | if ( my @res = ( $line =~ $thingy ) ) { |
62 | return @res; |
63 | } |
64 | } |
65 | } |
66 | |
67 | return; |
68 | } |
69 | |
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70 | 1; |
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71 | |
72 | __END__ |
73 | |
74 | =head1 NAME |
75 | |
76 | Devel::REPL::Plugin::Turtles - Generic command creation using a read hook |
77 | |
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78 | =head1 DESCRIPTION |
79 | |
80 | By default, this plugin allows calling commands using a read hook |
81 | to detect a default_command_prefix followed by the command name, |
82 | say MYCMD as an example. The actual routine to call for the |
83 | command is constructed by looking for subs named 'command_MYCMD' |
84 | or 'expr_MYCMD' and executing them. |
85 | |
86 | =head2 NOTE |
87 | |
88 | The C<default_command_prefix> is C<qr/\#/> so care must be taken |
89 | if other uses for that character are needed (e.g., '#' for the |
90 | shell escape character in the PDL shell. |
91 | |
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92 | =cut |
93 | |