1Dpkg::Substvars(3perl)           libdpkg-perl           Dpkg::Substvars(3perl)
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NAME

6       Dpkg::Substvars - handle variable substitution in strings
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DESCRIPTION

9       It provides a class which is able to substitute variables in strings.
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METHODS

12       $s = Dpkg::Substvars->new($file)
13               Create a new object that can do substitutions. By default it
14               contains generic substitutions like ${Newline}, ${Space},
15               ${Tab}, ${dpkg:Version} and ${dpkg:Upstream-Version}.
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17               Additional substitutions will be read from the $file passed as
18               parameter.
19
20               It keeps track of which substitutions were actually used (only
21               counting substvars(), not get()), and warns about unused
22               substvars when asked to. The substitutions that are always
23               present are not included in these warnings.
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25       $s->set($key, $value)
26               Add/replace a substitution.
27
28       $s->set_as_used($key, $value)
29               Add/replace a substitution and mark it as used (no warnings
30               will be produced even if unused).
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32       $s->set_as_auto($key, $value)
33               Add/replace a substitution and mark it as used and automatic
34               (no warnings will be produced even if unused).
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36       $s->get($key)
37               Get the value of a given substitution.
38
39       $s->delete($key)
40               Remove a given substitution.
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42       $s->mark_as_used($key)
43               Prevents warnings about a unused substitution, for example if
44               it is provided by default.
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46       $s->parse($fh, $desc)
47               Add new substitutions read from the filehandle. $desc is used
48               to identify the filehandle in error messages.
49
50               Returns the number of substitutions that have been parsed with
51               success.
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53       $s->load($file)
54               Add new substitutions read from $file.
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56       $s->set_version_substvars($sourceversion, $binaryversion)
57               Defines ${binary:Version}, ${source:Version} and
58               ${source:Upstream-Version} based on the given version strings.
59
60               These will never be warned about when unused.
61
62       $s->set_arch_substvars()
63               Defines architecture variables: ${Arch}.
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65               This will never be warned about when unused.
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67       $s->set_vendor_substvars()
68               Defines vendor variables: ${vendor:Name} and ${vendor:Id}.
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70               These will never be warned about when unused.
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72       $s->set_desc_substvars()
73               Defines source description variables: ${source:Synopsis} and
74               ${source:Extended-Description}.
75
76               These will never be warned about when unused.
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78       $s->set_field_substvars($ctrl, $prefix)
79               Defines field variables from a Dpkg::Control object, with each
80               variable having the form "${$prefix:$field}".
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82               They will never be warned about when unused.
83
84       $newstring = $s->substvars($string)
85               Substitutes variables in $string and return the result in
86               $newstring.
87
88       $s->warn_about_unused()
89               Issues warning about any variables that were set, but not used.
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91       $s->set_msg_prefix($prefix)
92               Define a prefix displayed before all warnings/error messages
93               output by the module.
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95       $s->filter(remove => $rmfunc)
96       $s->filter(keep => $keepfun)
97               Filter the substitution variables, either removing or keeping
98               all those that return true when $rmfunc->($key) or
99               $keepfunc->($key) is called.
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101       "$s"    Return a string representation of all substitutions variables
102               except the automatic ones.
103
104       $str = $s->output([$fh])
105               Return all substitutions variables except the automatic ones.
106               If $fh is passed print them into the filehandle.
107
108       $s->save($file)
109               Store all substitutions variables except the automatic ones in
110               the indicated file.
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CHANGES

113   Version 2.00 (dpkg 1.20.0)
114       Remove method: $s->no_warn().
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116       New method: $s->set_vendor_substvars().
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118   Version 1.06 (dpkg 1.19.0)
119       New method: $s->set_desc_substvars().
120
121   Version 1.05 (dpkg 1.18.11)
122       Obsolete substvar: Emit an error on Source-Version substvar usage.
123
124       New return: $s->parse() now returns the number of parsed substvars.
125
126       New method: $s->set_field_substvars().
127
128   Version 1.04 (dpkg 1.18.0)
129       New method: $s->filter().
130
131   Version 1.03 (dpkg 1.17.11)
132       New method: $s->set_as_auto().
133
134   Version 1.02 (dpkg 1.16.5)
135       New argument: Accept a $binaryversion in $s->set_version_substvars(),
136       passing a single argument is still supported.
137
138       New method: $s->mark_as_used().
139
140       Deprecated method: $s->no_warn(), use $s->mark_as_used() instead.
141
142   Version 1.01 (dpkg 1.16.4)
143       New method: $s->set_as_used().
144
145   Version 1.00 (dpkg 1.15.6)
146       Mark the module as public.
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1501.20.9                            2021-07-21            Dpkg::Substvars(3perl)