Class: Utilrb::PkgConfig

Inherits:
Object show all
Defined in:
lib/utilrb/pkgconfig.rb

Overview

Access to information from pkg-config(1)

This class allows to enumerate the pkg-config packages available, and create a PkgConfig object that allows to get access to the pkgconfig information.

Create a new pkgconfig object with

pkg = PkgConfig.new(name)

It raises PkgConfig::NotFound if the package is not available.

Then, the classical include directory and library directory flags can be listed with

pkg.include_dirs
pkg.library_dirs

Standard fields are available with

pkg.cflags
pkg.cflags_only_I
pkg.cflags_only_other
pkg.libs
pkg.libs_only_L
pkg.libs_only_l
pkg.libs_only_other
pkg.static

Arbitrary variables defined in the .pc file can be accessed with

pkg.prefix
pkg.libdir

Defined Under Namespace

Classes: DependencyLoop, Invalid, NotFound

Constant Summary collapse

PACKAGE_NAME_RX =
/[\w\-\.]+/
VAR_NAME_RX =
/\w+/
FIELD_NAME_RX =
/[\w\.\-]+/
SHELL_VARS =
%w{Cflags Libs Libs.private}
ACTIONS =
%w{cflags cflags-only-I cflags-only-other 
libs libs-only-L libs-only-l libs-only-other}
FOUND_PATH_RX =
/Scanning directory (?:#\d+ )?'(.*\/)((?:lib|lib64|share)\/.*)'$/
NONEXISTENT_PATH_RX =
/Cannot open directory (?:#\d+ )?'.*\/((?:lib|lib64|share)\/.*)' in package search path:.*/

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(name) ⇒ PkgConfig

Create a PkgConfig object for the package name Raises PkgConfig::NotFound if the module does not exist


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# File 'lib/utilrb/pkgconfig.rb', line 174

def initialize(name)
    @name    = name
    @fields    = Hash.new
    @variables = Hash.new
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(varname, *args, &proc) ⇒ Object

:nodoc:


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# File 'lib/utilrb/pkgconfig.rb', line 515

def method_missing(varname, *args, &proc) # :nodoc:
    if args.empty?
               variables[varname.to_s]
    else
	super(varname, *args, &proc)
    end
end

Instance Attribute Details

#descriptionObject (readonly)

Returns the value of attribute description


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# File 'lib/utilrb/pkgconfig.rb', line 153

def description
  @description
end

#fieldsObject (readonly)

Returns the value of attribute fields


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# File 'lib/utilrb/pkgconfig.rb', line 165

def fields
  @fields
end

#nameObject (readonly)

The module name


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# File 'lib/utilrb/pkgconfig.rb', line 152

def name
  @name
end

#pathObject (readonly)

Returns the value of attribute path


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# File 'lib/utilrb/pkgconfig.rb', line 149

def path
  @path
end

#raw_fieldsObject (readonly)

Returns the value of attribute raw_fields


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# File 'lib/utilrb/pkgconfig.rb', line 161

def raw_fields
  @raw_fields
end

#raw_versionObject (readonly)

The module version as a string


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# File 'lib/utilrb/pkgconfig.rb', line 156

def raw_version
  @raw_version
end

#requiresArray<PkgConfig> (readonly)

The list of packages that are Require:'d by this package

Returns:


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# File 'lib/utilrb/pkgconfig.rb', line 170

def requires
  @requires
end

#variablesObject (readonly)

Information extracted from the file


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# File 'lib/utilrb/pkgconfig.rb', line 164

def variables
  @variables
end

#versionObject (readonly)

The module version, as an array of integers


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# File 'lib/utilrb/pkgconfig.rb', line 159

def version
  @version
end

Class Method Details

.available_package_names(pkg_config_path: self.pkg_config_path) ⇒ Object


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# File 'lib/utilrb/pkgconfig.rb', line 547

def self.available_package_names(pkg_config_path: self.pkg_config_path)
    result = []
    each_pkgconfig_directory(pkg_config_path: pkg_config_path) do |dir|
        Dir.glob(File.join(dir, "*.pc")) do |path|
            result << File.basename(path, ".pc")
        end
    end
    result
end

.clear_cacheObject

Deprecated.

Utilrb::PkgConfig does not cache the packages anymore, so no need to call this method


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# File 'lib/utilrb/pkgconfig.rb', line 60

def self.clear_cache
end

.default_search_pathObject

Returns the system-wide search path that is embedded in pkg-config


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# File 'lib/utilrb/pkgconfig.rb', line 585

def self.default_search_path
    if !@default_search_path
        output = `LANG=C PKG_CONFIG_PATH= pkg-config --debug 2>&1`.split("\n")
        @default_search_path = output.grep(FOUND_PATH_RX).
            map { |l| l.gsub(FOUND_PATH_RX, '\1\2') }
    end
    return @default_search_path
end

.default_search_suffixesObject

Returns the system-wide standard suffixes that should be appended to new prefixes to find pkg-config files


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# File 'lib/utilrb/pkgconfig.rb', line 597

def self.default_search_suffixes
    if !@default_search_suffixes
        output = `LANG=C PKG_CONFIG_PATH= pkg-config --debug 2>&1`.split("\n")
        found_paths = output.grep(FOUND_PATH_RX).
            map { |l| l.gsub(FOUND_PATH_RX, '\2') }.
            to_set
        not_found = output.grep(NONEXISTENT_PATH_RX).
            map { |l| l.gsub(NONEXISTENT_PATH_RX, '\1') }.
            to_set
        @default_search_suffixes = found_paths | not_found
    end
    return @default_search_suffixes
end

.define_pkgconfig_action(action) ⇒ Object

:nodoc:


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# File 'lib/utilrb/pkgconfig.rb', line 403

def self.define_pkgconfig_action(action) # :nodoc:
           class_eval <<-EOD, __FILE__, __LINE__+1
           def pkgconfig_#{action.gsub(/-/, '_')}(static = false)
               if static
                   `pkg-config --#{action} --static \#{name}`.strip
               else
                   `pkg-config --#{action} \#{name}`.strip
               end
           end
           EOD
    nil
end

.each_package(regex = nil, pkg_config_path: self.pkg_config_path) ⇒ Object

Yields the package names of available packages. If regex is given, lists only the names that match the regular expression.


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# File 'lib/utilrb/pkgconfig.rb', line 564

def self.each_package(regex = nil, pkg_config_path: self.pkg_config_path)
    return enum_for(__method__) if !block_given?

    seen = Set.new
    each_pkgconfig_directory(pkg_config_path: pkg_config_path) do |dir|
        Dir.glob(File.join(dir, '*.pc')) do |file|
            pkg_name = File.basename(file, ".pc")
            next if seen.include?(pkg_name)
            next if regex && pkg_name !~ regex

            seen << pkg_name
            yield(pkg_name)
        end
    end
end

.each_pkgconfig_directory(pkg_config_path: self.pkg_config_path, &block) ⇒ Object


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# File 'lib/utilrb/pkgconfig.rb', line 527

def self.each_pkgconfig_directory(pkg_config_path: self.pkg_config_path, &block)
    return enum_for(__method__) if !block_given?
    if pkg_config_path
        pkg_config_path.split(':').each(&block)
    end
    default_search_path.each(&block)
end

.find_all_package_files(name, pkg_config_path: self.pkg_config_path) ⇒ Object

Returns true if there is a package with this name


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# File 'lib/utilrb/pkgconfig.rb', line 536

def self.find_all_package_files(name, pkg_config_path: self.pkg_config_path)
    result = []
    each_pkgconfig_directory(pkg_config_path: pkg_config_path) do |dir|
        path = File.join(dir, "#{name}.pc")
        if File.exist?(path)
            result << path
        end
    end
    result
end

.find_matching_version(candidates, version_spec) ⇒ Object

Returns the first package in candidates that match the given version spec


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# File 'lib/utilrb/pkgconfig.rb', line 105

def self.find_matching_version(candidates, version_spec)
    if version_spec
        version_spec =~ /([<>=]+)\s*([\d\.]+)/
        op, requested_version = $1, $2

        requested_op =
            if op == "=" then [0]
            elsif op == ">" then [1]
            elsif op == "<" then [-1]
            elsif op == "<=" then [-1, 0]
            elsif op == ">=" then [1, 0]
            end

        requested_version = requested_version.split('.').map { |v| Integer(v) }

        result = candidates.find do |pkg|
            requested_op.include?(pkg.version <=> requested_version)
        end
        if !result
            name = candidates.first.name
            raise NotFound.new(name), "no version of #{name} match #{version_spec}. Available versions are: #{candidates.map(&:raw_version).join(", ")}"
        end
        result
    else
        candidates.first
    end
end

.get(name, version_spec = nil, preset_variables = Hash.new, minimal: false, pkg_config_path: self.pkg_config_path, memo: Hash.new) ⇒ Object

Returns the pkg-config object that matches the given name, and optionally a version string


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# File 'lib/utilrb/pkgconfig.rb', line 65

def self.get(name, version_spec = nil, preset_variables = Hash.new,
    minimal: false, pkg_config_path: self.pkg_config_path, memo: Hash.new)

    paths = find_all_package_files(name, pkg_config_path: pkg_config_path)
    if paths.empty?
        raise NotFound.new(name), "cannot find the pkg-config specification for #{name}"
    end

    candidates = paths.map do |p|
        PkgConfig.load_minimal(p, preset_variables)
    end

    # Now try to find a matching spec
    if match = find_matching_version(candidates, version_spec)
        memo[[name, version_spec]] = [false, match]
    else
        raise NotFound, "found #{candidates.size} packages for #{name},"\
            " but none match the version specification #{version_spec}"
    end

    match.load_fields(memo: memo) unless minimal

    memo[[name, version_spec]] = [true, match]
    match
end

.has_package?(name, pkg_config_path: self.pkg_config_path) ⇒ Boolean

Returns true if there is a package with this name

Returns:

  • (Boolean)

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# File 'lib/utilrb/pkgconfig.rb', line 558

def self.has_package?(name, pkg_config_path: self.pkg_config_path)
    !find_all_package_files(name, pkg_config_path: pkg_config_path).empty?
end

.load(path, preset_variables) ⇒ Object


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# File 'lib/utilrb/pkgconfig.rb', line 44

def self.load(path, preset_variables)
    pkg_name = File.basename(path, ".pc")
    pkg = Class.instance_method(:new).bind(PkgConfig).call(pkg_name)
    pkg.load(path, preset_variables)
    pkg
end

.load_minimal(path, preset_variables) ⇒ Object


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# File 'lib/utilrb/pkgconfig.rb', line 51

def self.load_minimal(path, preset_variables)
    pkg_name = File.basename(path, ".pc")
    pkg = Class.instance_method(:new).bind(PkgConfig).call(pkg_name)
    pkg.load_minimal(path, preset_variables)
    pkg
end

.new(name, version_spec = nil, options = Hash.new) ⇒ PkgConfig

Finds the provided package and optional version and returns its PkgConfig description

number“, where op is < <= >= > or == and the version number X, X.y, …

Parameters:

  • version_spec (String) (defaults to: nil)

    version specification, of the form “op

Returns:

Raises:

  • (NotFound)

    if the package is not found


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# File 'lib/utilrb/pkgconfig.rb', line 99

def self.new(name, version_spec = nil, options = Hash.new)
    get(name, version_spec, options)
end

.parse_dependencies(string, allow_loops: false, memo: Hash.new) ⇒ Object


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# File 'lib/utilrb/pkgconfig.rb', line 201

def self.parse_dependencies(string, allow_loops: false, memo: Hash.new)
    string = string.gsub(',', ' ')
    packages = []
    words = string.split(' ')
    while !words.empty?
        w = words.shift
        if w =~ /[<>=]/
            version = words.shift
            if  version =~ /[\d\.]+/
                packages[-1][1] = "#{w} #{version}"
            else
                packages << [version, nil]
            end
        else
            packages << [w, nil]
        end
    end
    result = packages.map do |dep|
        finished, pkg = memo[dep]
        if pkg
            if allow_loops || finished
                pkg
            else
                raise DependencyLoop, "found a dependency loop"
            end
        else
            PkgConfig.get(*dep, memo: memo)
        end
    end
    result.compact
end

.pkg_config_pathObject


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# File 'lib/utilrb/pkgconfig.rb', line 523

def self.pkg_config_path
    ENV['PKG_CONFIG_PATH']
end

Instance Method Details

#cflagsObject


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# File 'lib/utilrb/pkgconfig.rb', line 460

def cflags
    raw_cflags.join(" ")
end

#cflags_only_IObject


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# File 'lib/utilrb/pkgconfig.rb', line 464

def cflags_only_I
    raw_cflags_only_I.join(" ")
end

#cflags_only_otherObject


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# File 'lib/utilrb/pkgconfig.rb', line 468

def cflags_only_other
    raw_cflags_only_other.join(" ")
end

#conflictsObject


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# File 'lib/utilrb/pkgconfig.rb', line 444

def conflicts
    @conflicts
end

#expand_field(name, field) ⇒ Object


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# File 'lib/utilrb/pkgconfig.rb', line 302

def expand_field(name, field)
    if SHELL_VARS.include?(name) 
        value = Shellwords.shellsplit(field)
        resolved = Array.new
        while !value.empty?
            value = value.flat_map do |v|
                expanded = perform_substitution(v, variables, name)
                if expanded == v
                    resolved << v
                    nil
                else
                    Shellwords.shellsplit(expanded)
                end
            end.compact
        end
        resolved
    else
        perform_substitution(field, variables, name)
    end
end

#expand_variables(raw_variables) ⇒ Object


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# File 'lib/utilrb/pkgconfig.rb', line 285

def expand_variables(raw_variables)
    raw_variables = raw_variables.dup

    variables = Hash.new
    # Resolve the variables
    while variables.size != raw_variables.size
        raw_variables.each do |name, value|
            value = perform_substitution(value, raw_variables, name)
            raw_variables[name] = value
            if value !~ /\$\{#{VAR_NAME_RX}\}/
                variables[name] = value
            end
        end
    end
    variables
end

#include_dirsObject

Returns the list of include directories listed in the Cflags: section of the pkgconfig file


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# File 'lib/utilrb/pkgconfig.rb', line 422

def include_dirs
    result = raw_cflags_only_I.map { |v| v[2..-1] }
    if result.any?(&:empty?)
        raise Invalid.new(name), "empty include directory (-I without argument) found in pkg-config package #{name}"
    end
    result
end

#library_dirsObject

Returns the list of library directories listed in the Libs: section of the pkgconfig file


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# File 'lib/utilrb/pkgconfig.rb', line 432

def library_dirs
    result = raw_libs_only_L.map { |v| v[2..-1] }
    if result.any?(&:empty?)
        raise Invalid.new(name), "empty link directory (-L without argument) found in pkg-config package #{name}"
    end
    result
end

#libs(static = false) ⇒ Object


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# File 'lib/utilrb/pkgconfig.rb', line 499

def libs(static = false)
    raw_libs(static).join(" ")
end

#libs_only_L(static = false) ⇒ Object


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# File 'lib/utilrb/pkgconfig.rb', line 503

def libs_only_L(static = false)
    raw_libs_only_L(static).join(" ")
end

#libs_only_l(static = false) ⇒ Object


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# File 'lib/utilrb/pkgconfig.rb', line 507

def libs_only_l(static = false)
    raw_libs_only_l(static).join(" ")
end

#libs_only_other(static = false) ⇒ Object


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# File 'lib/utilrb/pkgconfig.rb', line 511

def libs_only_other(static = false)
    raw_libs_only_other(static).join(" ")
end

#load(path, preset_variables = Hash.new) ⇒ Object

Loads the information contained in path


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# File 'lib/utilrb/pkgconfig.rb', line 396

def load(path, preset_variables = Hash.new)
    if !@raw_fields
        load_minimal(path, preset_variables)
    end
    load_fields
end

#load_fields(memo: Hash.new) ⇒ Object


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# File 'lib/utilrb/pkgconfig.rb', line 346

def load_fields(memo: Hash.new)
    fields = Hash.new
    @raw_fields.each do |name, value|
        fields[name] = expand_field(name, value)
    end
    @fields = fields

    # Initialize the main flags
    @description = (fields['Description'] || '')

    # Get the requires/conflicts
    @requires  = PkgConfig.parse_dependencies(
        fields['Requires'] || '', allow_loops: false, memo: memo)
    @requires_private  = PkgConfig.parse_dependencies(
        fields['Requires.private'] || '', allow_loops: false, memo: memo)
    @conflicts = PkgConfig.parse_dependencies(
        fields['Conflicts'] || '', allow_loops: true, memo: memo)

    # And finally resolve the compilation flags
    @cflags = fields['Cflags'] || []
    @requires.each do |pkg|
        @cflags.concat(pkg.raw_cflags)
    end
    @requires_private.each do |pkg|
        @cflags.concat(pkg.raw_cflags)
    end
    @cflags.uniq!
    @cflags.delete('-I/usr/include')
    @ldflags = Hash.new
    @ldflags[false] = fields['Libs'] || []
    @ldflags[false].delete('-L/usr/lib')
    @ldflags[false].uniq!
    @ldflags[true] = @ldflags[false] + (fields['Libs.private'] || [])
    @ldflags[true].delete('-L/usr/lib')
    @ldflags[true].uniq!

    @ldflags_with_requires = {
        true => @ldflags[true].dup,
        false => @ldflags[false].dup
    }
    @requires.each do |pkg| 
        @ldflags_with_requires[true].concat(pkg.raw_ldflags_with_requires[true])
        @ldflags_with_requires[false].concat(pkg.raw_ldflags_with_requires[false])
    end
    @requires_private.each do |pkg|
        @ldflags_with_requires[true].concat(pkg.raw_ldflags_with_requires[true])
    end
end

#load_minimal(path, preset_variables = Hash.new) ⇒ Object


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# File 'lib/utilrb/pkgconfig.rb', line 329

def load_minimal(path, preset_variables = Hash.new)
    raw_variables, raw_fields = parse(path)
    raw_variables = preset_variables.merge(raw_variables)

    @variables = expand_variables(raw_variables)
    if raw_fields['Version']
        @raw_version = expand_field('Version', raw_fields['Version'])
    else
        @raw_version = ''
    end
    @version = raw_version.split('.').map { |v| Integer(v) if v =~ /^\d+$/ }.compact

    # To be used in the call to #load
    @raw_fields = raw_fields
    @path = path
end

#load_variables(path, preset_variables = Hash.new) ⇒ Object


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# File 'lib/utilrb/pkgconfig.rb', line 323

def load_variables(path, preset_variables = Hash.new)
    raw_variables, raw_fields = parse(path)
    raw_variables = preset_variables.merge(raw_variables)
    expand_variables(raw_variables)
end

#normalize_field_name(name) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Normalize a field name to be lowercase with only the first letter capitalized


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# File 'lib/utilrb/pkgconfig.rb', line 239

def normalize_field_name(name)
    name = name.downcase
    name[0, 1] = name[0, 1].upcase
    name
end

#parse(path) ⇒ (Hash,Hash)

Parse a pkg-config field and extracts the raw definition of variables and fields

Returns:

  • ((Hash,Hash))

    the set of variables and the set of fields


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# File 'lib/utilrb/pkgconfig.rb', line 249

def parse(path)
    running_line = nil
    file = File.readlines(path).map do |line|
        line = line.gsub(/\s*#.*$/, '')
        line = line.strip
        next if line.empty?

        value = line.gsub(/\\$/, '')
        if running_line
            running_line << " " << value
        end

        if line =~ /\\$/
            running_line ||= value
        elsif running_line
            running_line = nil
        else
            value
        end
    end.compact

    raw_variables, raw_fields = Hash.new, Hash.new
    file.each do |line|
        case line
        when /^(#{VAR_NAME_RX})\s*=(.*)/
            raw_variables[$1] = $2.strip
        when /^(#{FIELD_NAME_RX}):\s*(.*)/
            field_name = normalize_field_name($1)
            raw_fields[field_name] = $2.strip
        else
            raise NotImplementedError, "#{path}: cannot parse pkg-config line #{line.inspect}"
        end
    end
    return raw_variables, raw_fields
end

#perform_substitution(value, variables, current) ⇒ Object

Helper method that expands $word in value using the name to value map variables

current is a string that describes what we are expanding. It is used to detect recursion in expansion of variables, and to give meaningful errors to the user


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# File 'lib/utilrb/pkgconfig.rb', line 186

def perform_substitution(value, variables, current)
    value = value.gsub(/\$\{(\w+)\}/) do |rx|
        expand_name = $1
        if expand_name == current
            raise "error in pkg-config file #{path}: #{current} contains a reference to itself"
        elsif !(expanded = variables[expand_name])
            raise "error in pkg-config file #{path}: #{current} contains a reference to #{expand_name} but there is no such variable"
        end
        expanded
    end
    value
end

#pkgconfig_variable(varname) ⇒ Object


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# File 'lib/utilrb/pkgconfig.rb', line 416

def pkgconfig_variable(varname)
    `pkg-config --variable=#{varname}`.strip
end

#raw_cflagsObject


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# File 'lib/utilrb/pkgconfig.rb', line 448

def raw_cflags
    @cflags
end

#raw_cflags_only_IObject


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# File 'lib/utilrb/pkgconfig.rb', line 452

def raw_cflags_only_I
    @cflags.grep(/^-I/)
end

#raw_cflags_only_otherObject


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# File 'lib/utilrb/pkgconfig.rb', line 456

def raw_cflags_only_other
    @cflags.find_all { |s| s !~ /^-I/ }
end

#raw_ldflagsObject


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# File 'lib/utilrb/pkgconfig.rb', line 473

def raw_ldflags
    @ldflags
end

#raw_ldflags_with_requiresObject


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# File 'lib/utilrb/pkgconfig.rb', line 477

def raw_ldflags_with_requires
    @ldflags_with_requires
end

#raw_libs(static = false) ⇒ Object


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# File 'lib/utilrb/pkgconfig.rb', line 482

def raw_libs(static = false)
    @ldflags_with_requires[static]
end

#raw_libs_only_L(static = false) ⇒ Object


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# File 'lib/utilrb/pkgconfig.rb', line 486

def raw_libs_only_L(static = false)
    @ldflags_with_requires[static].grep(/^-L/)
end

#raw_libs_only_l(static = false) ⇒ Object


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# File 'lib/utilrb/pkgconfig.rb', line 490

def raw_libs_only_l(static = false)
    @ldflags_with_requires[static].grep(/^-l/)
end

#raw_libs_only_other(static = false) ⇒ Object


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# File 'lib/utilrb/pkgconfig.rb', line 494

def raw_libs_only_other(static = false)
    @ldflags_with_requires[static].find_all { |s| s !~ /^-[lL]/ }
end