1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
|
.\" -*- mode: troff; coding: utf-8 -*-
.\" Automatically generated by Pod::Man 5.01 (Pod::Simple 3.43)
.\"
.\" 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
.\" ========================================================================
.\"
.IX Title "CPAN::Meta::Merge 3perl"
.TH CPAN::Meta::Merge 3perl 2024-05-30 "perl v5.38.2" "Perl Programmers Reference Guide"
.\" 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
CPAN::Meta::Merge \- Merging CPAN Meta fragments
.SH VERSION
.IX Header "VERSION"
version 2.150010
.SH SYNOPSIS
.IX Header "SYNOPSIS"
.Vb 2
\& my $merger = CPAN::Meta::Merge\->new(default_version => "2");
\& my $meta = $merger\->merge($base, @additional);
.Ve
.SH DESCRIPTION
.IX Header "DESCRIPTION"
.SH METHODS
.IX Header "METHODS"
.SS new
.IX Subsection "new"
This creates a CPAN::Meta::Merge object. It takes one mandatory named
argument, \f(CW\*(C`version\*(C'\fR, declaring the version of the meta-spec that must be
used for the merge. It can optionally take an \f(CW\*(C`extra_mappings\*(C'\fR argument
that allows one to add additional merging functions for specific elements.
.PP
The \f(CW\*(C`extra_mappings\*(C'\fR arguments takes a hash ref with the same type of
structure as described in CPAN::Meta::Spec, except with its values as
one of the defined merge strategies or a code ref
to a merging function.
.PP
.Vb 11
\& my $merger = CPAN::Meta::Merge\->new(
\& default_version => \*(Aq2\*(Aq,
\& extra_mappings => {
\& \*(Aqoptional_features\*(Aq => \e&custom_merge_function,
\& \*(Aqx_custom\*(Aq => \*(Aqset_addition\*(Aq,
\& \*(Aqx_meta_meta\*(Aq => {
\& name => \*(Aqidentical\*(Aq,
\& tags => \*(Aqset_addition\*(Aq,
\& }
\& }
\& );
.Ve
.SS merge(@fragments)
.IX Subsection "merge(@fragments)"
Merge all \f(CW@fragments\fR together. It will accept both CPAN::Meta objects and
(possibly incomplete) hashrefs of metadata.
.SH "MERGE STRATEGIES"
.IX Header "MERGE STRATEGIES"
\&\f(CW\*(C`merge\*(C'\fR uses various strategies to combine different elements of the CPAN::Meta objects. The following strategies can be used with the extra_mappings argument of \f(CW\*(C`new\*(C'\fR:
.IP identical 4
.IX Item "identical"
The elements must be identical
.IP set_addition 4
.IX Item "set_addition"
The union of two array refs
.Sp
.Vb 1
\& [ a, b ] U [ a, c] = [ a, b, c ]
.Ve
.IP uniq_map 4
.IX Item "uniq_map"
Key value pairs from the right hash are merged to the left hash. Key
collisions are only allowed if their values are the same. This merge
function will recurse into nested hash refs following the same merge
rules.
.IP improvise 4
.IX Item "improvise"
This merge strategy will try to pick the appropriate predefined strategy
based on what element type. Array refs will try to use the
\&\f(CW\*(C`set_addition\*(C'\fR strategy, Hash refs will try to use the \f(CW\*(C`uniq_map\*(C'\fR
strategy, and everything else will try the \f(CW\*(C`identical\*(C'\fR strategy.
.SH AUTHORS
.IX Header "AUTHORS"
.IP \(bu 4
David Golden <dagolden@cpan.org>
.IP \(bu 4
Ricardo Signes <rjbs@cpan.org>
.IP \(bu 4
Adam Kennedy <adamk@cpan.org>
.SH "COPYRIGHT AND LICENSE"
.IX Header "COPYRIGHT AND LICENSE"
This software is copyright (c) 2010 by David Golden, Ricardo Signes, Adam Kennedy and Contributors.
.PP
This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.
|
