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