Dpkg::Substvars(3perl) libdpkg-perl Dpkg::Substvars(3perl)
NAME
Dpkg::Substvars - handle variable substitution in strings
DESCRIPTION
It provides a class which is able to substitute variables in strings.
METHODS
$s = Dpkg::Substvars->new($file)
Create a new object that can do substitutions. By default it
contains generic substitutions like ${Newline}, ${Space},
${Tab}, ${dpkg:Version} and ${dpkg:Upstream-Version}.
Additional substitutions will be read from the $file passed as
parameter.
It keeps track of which substitutions were actually used (only
counting substvars(), not get()), and warns about unused
substvars when asked to. The substitutions that are always
present are not included in these warnings.
$s->set($key, $value)
Add/replace a substitution.
$s->set_as_used($key, $value)
Add/replace a substitution and mark it as used (no warnings
will be produced even if unused).
$s->set_as_auto($key, $value)
Add/replace a substitution and mark it as used and automatic
(no warnings will be produced even if unused).
$s->get($key)
Get the value of a given substitution.
$s->delete($key)
Remove a given substitution.
$s->mark_as_used($key)
Prevents warnings about a unused substitution, for example if
it is provided by default.
$s->parse($fh, $desc)
Add new substitutions read from the filehandle. $desc is used
to identify the filehandle in error messages.
Returns the number of substitutions that have been parsed with
success.
$s->load($file)
Add new substitutions read from $file.
$s->set_version_substvars($sourceversion, $binaryversion)
Defines ${binary:Version}, ${source:Version} and
${source:Upstream-Version} based on the given version strings.
These will never be warned about when unused.
$s->set_arch_substvars()
Defines architecture variables: ${Arch}.
This will never be warned about when unused.
$s->set_vendor_substvars()
Defines vendor variables: ${vendor:Name} and ${vendor:Id}.
These will never be warned about when unused.
$s->set_desc_substvars()
Defines source description variables: ${source:Synopsis} and
${source:Extended-Description}.
These will never be warned about when unused.
$s->set_field_substvars($ctrl, $prefix)
Defines field variables from a Dpkg::Control object, with each
variable having the form "${$prefix:$field}".
They will never be warned about when unused.
$newstring = $s->substvars($string)
Substitutes variables in $string and return the result in
$newstring.
$s->warn_about_unused()
Issues warning about any variables that were set, but not used.
$s->set_msg_prefix($prefix)
Define a prefix displayed before all warnings/error messages
output by the module.
$s->filter(remove => $rmfunc)
$s->filter(keep => $keepfun)
Filter the substitution variables, either removing or keeping
all those that return true when $rmfunc->($key) or
$keepfunc->($key) is called.
"$s" Return a string representation of all substitutions variables
except the automatic ones.
$str = $s->output([$fh])
Return all substitutions variables except the automatic ones.
If $fh is passed print them into the filehandle.
$s->save($file)
Store all substitutions variables except the automatic ones in
the indicated file.
CHANGES
Version 2.01 (dpkg 1.21.8)
New feature: Add support for optional substitution variables.
Version 2.00 (dpkg 1.20.0)
Remove method: $s->no_warn().
New method: $s->set_vendor_substvars().
Version 1.06 (dpkg 1.19.0)
New method: $s->set_desc_substvars().
Version 1.05 (dpkg 1.18.11)
Obsolete substvar: Emit an error on Source-Version substvar usage.
New return: $s->parse() now returns the number of parsed substvars.
New method: $s->set_field_substvars().
Version 1.04 (dpkg 1.18.0)
New method: $s->filter().
Version 1.03 (dpkg 1.17.11)
New method: $s->set_as_auto().
Version 1.02 (dpkg 1.16.5)
New argument: Accept a $binaryversion in $s->set_version_substvars(),
passing a single argument is still supported.
New method: $s->mark_as_used().
Deprecated method: $s->no_warn(), use $s->mark_as_used() instead.
Version 1.01 (dpkg 1.16.4)
New method: $s->set_as_used().
Version 1.00 (dpkg 1.15.6)
Mark the module as public.
1.22.6 2025-09-18 Dpkg::Substvars(3perl)
Generated by dwww version 1.16 on Tue Dec 16 17:03:29 CET 2025.