Module: Rscons::Util

Defined in:
lib/rscons/util.rb

Overview

A collection of stand-alone utility methods.

Class Method Summary collapse

Class Method Details

.absolute_path?(path) ⇒ Boolean

Return whether the given path is an absolute filesystem path.

Parameters:

  • path (String) —

    the path to examine.

Returns:

  • (Boolean) —

    Whether the given path is an absolute filesystem path.



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# File 'lib/rscons/util.rb', line 11

def absolute_path?(path)
  if RUBY_PLATFORM =~ /mingw/
    path =~ %r{^(?:\w:)?[\\/]}
  else
    path.start_with?("/")
  end
end

.colorize_markup(message) ⇒ Array

Colorize a builder run message.

Parameters:

  • message (String) —

    Builder run message.

Returns:

  • (Array) —

    Colorized message with color codes for Ansi module.



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# File 'lib/rscons/util.rb', line 26

def colorize_markup(message)
  if message =~ /^(.*?)(<[^>]+>)(.*)$/
    prefix, code, suffix = $1, $2, $3
    case code
    when "<target>"
      code = :magenta
    when "<source>"
      code = :cyan
    when "<reset>"
      code = :reset
    end
    [prefix, code, *colorize_markup(suffix)].delete_if {|v| v == ""}
  else
    [message]
  end
end

.command_to_s(command) ⇒ String

Return a string representation of a command.

Parameters:

  • command (Array<String>) —

    The command.

Returns:

  • (String) —

    The string representation of the command.



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# File 'lib/rscons/util.rb', line 50

def command_to_s(command)
  command.map { |c| c =~ /\s/ ? "'#{c}'" : c }.join(' ')
end

.determine_n_threads ⇒ Integer

Determine the number of threads to use by default.

Returns:

  • (Integer) —

    The number of threads to use by default.



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# File 'lib/rscons/util.rb', line 58

def determine_n_threads
  # If the user specifies the number of threads in the environment, then
  # respect that.
  if ENV["RSCONS_NTHREADS"] =~ /^(\d+)$/
    return $1.to_i
  end

  # Otherwise try to figure out how many threads are available on the
  # host hardware.
  begin
    case RbConfig::CONFIG["host_os"]
    when /linux/
      return File.read("/proc/cpuinfo").scan(/^processor\s*:/).size
    when /mswin|mingw/
      if `wmic cpu get NumberOfLogicalProcessors /value` =~ /NumberOfLogicalProcessors=(\d+)/
        return $1.to_i
      end
    when /darwin/
      if `sysctl -n hw.ncpu` =~ /(\d+)/
        return $1.to_i
      end
    end
  rescue
  end

  # If we can't figure it out, default to 1.
  1
end

.find_executable(name) ⇒ String?

Look for an executable.

Returns:

  • (String, nil) —

    Executable path, if found.



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# File 'lib/rscons/util.rb', line 108

def find_executable(name)
  if name["/"] or name["\\"]
    if File.file?(name) and File.executable?(name)
      return name
    end
  else
    path_entries = ENV["PATH"].split(File::PATH_SEPARATOR)
    path_entries.find do |path_entry|
      if path = test_path_for_executable(path_entry, name)
        return path
      end
    end
  end
end

.format_elapsed_time(elapsed) ⇒ String

Format an elapsed time in human-readable format.

Returns:

  • (String) —

    Elapsed time in human-readable format.



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# File 'lib/rscons/util.rb', line 127

def format_elapsed_time(elapsed)
  hours = (elapsed / (60 * 60)).to_i
  elapsed -= hours * 60 * 60
  minutes = (elapsed / 60).to_i
  elapsed -= minutes * 60
  seconds = elapsed.ceil
  result = ""
  if hours > 0
    result += "#{hours}h "
  end
  if hours > 0 || minutes > 0
    result += "#{minutes}m "
  end
  result += "#{seconds}s"
  result
end

.make_relative_path(path) ⇒ String

Make a relative path corresponding to a possibly absolute one.

Parameters:

  • path (String) —

    Input path that is possibly absolute.

Returns:

  • (String) —

    Relative path.



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# File 'lib/rscons/util.rb', line 151

def make_relative_path(path)
  if absolute_path?(path)
    if path =~ %r{^(\w):(.*)$}
      "_#{$1}#{$2}"
    else
      "_#{path}"
    end
  else
    path
  end
end

.parse_dependency_file(mf_fname) ⇒ Array<String>

Parse dependencies from a Makefile or ldc2 dependency file.

This method is used internally by Rscons builders.

Parameters:

  • mf_fname (String) —

    File name of the Makefile to read.

Returns:

  • (Array<String>) —

    Paths of dependency files.



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# File 'lib/rscons/util.rb', line 172

def parse_dependency_file(mf_fname)
  deps = []
  buildup = ''
  File.read(mf_fname).each_line do |line|
    if line =~ /^(.*)\\\s*$/
      buildup += ' ' + $1
    else
      buildup += ' ' + line
      if buildup =~ /^[^:]+\(\S+\)\s*:.*?:[^:]+\((\S+)\)/
        # ldc2-style dependency line
        deps << $1
      elsif buildup =~ /^.*: (.*)$/
        # Makefile-style dependency line
        mf_deps = $1
        deps += mf_deps.split(' ').map(&:strip)
      end
      buildup = ''
    end
  end
  deps
end

.short_format_paths(paths) ⇒ String

Return a string showing the path specified, or if more than one, then the first path with a “(+D)” afterward, where D is the number of remaining paths.

Parameters:

  • paths (Array<String>) —

    Paths.

Returns:

  • (String) —

    Condensed path readout.



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# File 'lib/rscons/util.rb', line 96

def short_format_paths(paths)
  if paths.size == 1
    paths.first
  else
    "#{paths.first} (+#{paths.size - 1})"
  end
end