utils.rb

#  Copyright 2009 Max Howell and other contributors.
#
#  Redistribution and use in source and binary forms, with or without
#  modification, are permitted provided that the following conditions
#  are met:
#
#  1. Redistributions of source code must retain the above copyright
#     notice, this list of conditions and the following disclaimer.
#  2. Redistributions in binary form must reproduce the above copyright
#     notice, this list of conditions and the following disclaimer in the
#     documentation and/or other materials provided with the distribution.
#
#  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
#  IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
#  OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
#  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
#  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
#  NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
#  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
#  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
#  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
#  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

class Tty
  class <<self
    def blue; bold 34; end
    def white; bold 39; end
    def red; underline 31; end
    def yellow; underline 33 ; end
    def reset; escape 0; end
    
  private
    def color n
      escape "0;#{n}"
    end
    def bold n
      escape "1;#{n}"
    end
    def underline n
      escape "4;#{n}"
    end
    def escape n
      "\033[#{n}m" if $stdout.tty?
    end
  end
end

# args are additional inputs to puts until a nil arg is encountered
def ohai title, *sput
  title = title.to_s[0, `/usr/bin/tput cols`.strip.to_i-4] unless ARGV.verbose?
  puts "#{Tty.blue}==>#{Tty.white} #{title}#{Tty.reset}"
  puts *sput unless sput.empty?
end

def opoo warning
  puts "#{Tty.red}Warning#{Tty.reset}: #{warning}"
end

def onoe error
  lines = error.to_s.split'\n'
  puts "#{Tty.red}Error#{Tty.reset}: #{lines.shift}"
  puts *lines unless lines.empty?
end

def pretty_duration s
  return "2 seconds" if s < 3 # avoids the plural problem ;)
  return "#{s.to_i} seconds" if s < 120
  return "%.1f minutes" % (s/60)
end

def interactive_shell
  fork do
    # TODO make the PS1 var change pls
    #brown="\[\033[0;33m\]"
    #reset="\[\033[0m\]"
    #ENV['PS1']="Homebrew-#{HOMEBREW_VERSION} #{brown}\W#{reset}\$ "
    exec ENV['SHELL']
  end
  Process.wait
  unless $?.success?
    puts "Aborting due to non-zero exit status"
    exit $?
  end
end

# Kernel.system but with exceptions
def safe_system cmd, *args
  puts "#{cmd} #{args*' '}" if ARGV.verbose?
  fork do
    trap("EXIT") {} # no bt on exit from this short-lived fork
    exit! 1 unless exec(cmd, *args)
  end
  Process.wait
  raise ExecutionError.new(cmd, args, $?) unless $?.success?
end

def curl *args
  safe_system 'curl', '-f#LA', HOMEBREW_USER_AGENT, *args unless args.empty?
end

def puts_columns items, cols = 4
  if $stdout.tty?
    items = items.join("\n") if items.is_a?(Array)
    items.concat("\n") unless items.empty?
    width=`/bin/stty size`.chomp.split(" ").last
    IO.popen("/usr/bin/pr -#{cols} -t", "w"){|io| io.write(items) }
  else
    puts *items
  end
end

def exec_editor *args
  editor=ENV['EDITOR']
  if editor.nil?
    if system "/usr/bin/which -s mate"
      editor='mate'
    else
      editor='/usr/bin/vim'
    end
  end
  # we split the editor because especially on mac "mate -w" is common
  # but we still want to use the comma-delimited version of exec because then
  # we don't have to escape args, and escaping 100% is tricky
  exec *(editor.split+args)
end

# provide an absolute path to a command or this function will search the PATH
def arch_for_command cmd
    archs = []
    cmd = `/usr/bin/which #{cmd}` if not Pathname.new(cmd).absolute?

    IO.popen("/usr/bin/file #{cmd}").readlines.each do |line|
      case line
      when /Mach-O executable ppc/
        archs << :ppc7400
      when /Mach-O 64-bit executable ppc64/
        archs << :ppc64
      when /Mach-O executable i386/
        archs << :i386
      when /Mach-O 64-bit executable x86_64/
        archs << :x86_64
      end
    end

    return archs
end

# replaces before with after for the file path
def inreplace path, before, after
  f = File.open(path, 'r')
  o = f.read.gsub(before, after)
  f.reopen(path, 'w').write(o)
  f.close
end

def ignore_interrupts
  std_trap = trap("INT") {}
  yield
ensure
  trap("INT", std_trap)
end