Installing Git from source in Edgy Eft

Written on March 23, 2008 by Jim | 1 Comment

download the necessary packages:

sudo apt-get install comerr-dev \
libcurl4-openssl-dev \
libidn11-dev \
libkadm55 \
libkrb5-dev \
texi2html \
texinfo \
docbook2x \
libosp5 \
libxml-namespacesupport-perl \
libxml-sax-expat-perl \
libxml-sax-perl \
opensp

download the latest stable release from here:

http://kernel.org/pub/software/scm/git/

i preferred the global install, and went for

make prefix=/usr all doc info

and then

sudo make prefix=/usr install install-doc

(the INSTALL file suggests adding “install-info” to the end of that (to install the docs in INFO format), but I kept getting an error during the make task- no dice.)

type

git –version

and make sure you’ve gotten a nice response. If so, done! If not, post a comment here and/or ask around on the git forums.

if you’d like to be adventurous: rather than downloading the latest release candidate, consider going all the way and building from the latest version of the git repository (after getting another version of git to work, natch).

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Extending Ruby’s Time class with ‘before?’ and ‘after?’

Written on January 21, 2008 by Jim | 2 Comments

The mixin below allows comparison between two Time objects using the more intuitive and natural-sounding before? and after? methods.

Some examples (using Rails’ ActiveSupport Time extensions or (preferred) the ‘units’ gem):

2.minutes.ago.after? Time.now # =>; false
Time.now.before? 2.hours.from_now # => true
module BeforeAndAfter

  LEFT_SIDE_LARGER  = 1
  RIGHT_SIDE_LARGER = -1
  EQUAL             = 0
  ACCEPTABLE_SWITCH_VALUES = [ :before , :after ]

  def before?(input_time)
    return comparison(:before, input_time)
  end

  def after?(input_time)
    return comparison(:after, input_time)
  end

private

  def comparison(switch, input_time)

    raise ArgumentError, "bad comparison switch" unless ACCEPTABLE_SWITCH_VALUES.include? switch

    comparison_result = self <=> input_time

    case comparison_result
      when LEFT_SIDE_LARGER
        case switch
          when :before
            return false
          when :after
            return true
        end
      when RIGHT_SIDE_LARGER
        case switch
          when :before
            return true
          when :after
            return false
        end
      when EQUAL
        return false
    end
  end
end

Time.send :include , BeforeAndAfter

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