Indent the middle of multiple lines

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I often run into situations like this:

title : Jekyll Bootstrap
tagline: Site Tagline
author :
  name : Name Lastname
  email : blah@email.test
  github : username
  twitter : username
  feedburner : feedname

Where the arguments are not lined up well, is there a standard way in vim for to have it formatted with each of the according arguments aligned to the nearest indent where an indent is defined as 2 spaces without having to go through line by line to the, such as in the following:

title   : Jekyll Bootstrap
tagline : Site Tagline
author  :
  name      : Name Lastname
  email     : blah@email.test
  github    : username
  twitter   : username
  feedburner: feedname

UPDATE:

I believe tabular.vim is the plugin I am looking for but I am having a difficult time forming a regular expression which would take into account the number of spaces at the beginning of the line when deciding something should be part of a block, i.e. Tabularize/: produces:

title       : Jekyll Bootstrap
tagline     : Site Tagline
author      :
  name      : Name Lastname
  email     : blah@email.test
  github    : username
  twitter   : username
  feedburner: feedname

The is an example in the documentation where the following is achieved via a regular expression:

abc,def,ghi
a,b
a,b,c

:Tabularize /^[^,]*\zs,/r0c0l0

abc,def,ghi
  a,b
  a,b,c

But I am unsure how to formulate this when consider each line with the same number of spaces in front part of the same block while still evaluating subblock such as in the following more complex than my original example:

comments :
  provider : disqus
  disqus :
    short_name : jekyllbootstrap
  livefyre :
    site_id : 123
  intensedebate :
    account : 123abc
  facebook :
    appid : 123
    num_posts : 5
    width : 580
    colorscheme : light

would be transformed tabularize\some_regular_expression_I_cant_figure_out to:

comments :
  provider      : disqus
  disqus        :
    short_name    : jekyllbootstrap
  livefyre      :
    site_id       : 123
  intensedebate :
    account       : 123abc
  facebook      :
    appid         : 123
    num_posts     : 5
    width         : 580
    colorscheme   : light

Answer

The Tabularize plugin for vim can do exactly what you want. It comes down to typing Tabularize /:

This will probably not keep the indentation on the left however.

Edit on your updated question:
I was not able to do that with Tabular directly, but I was able to do this with a second command, which is a search and replace on a range:

 :%s/\([ ]*\)[[:alpha:][:punct:]]*[ ]*/\0\1/

This searches for a certain amount of spaces in front of the :, and pastes them just before this semicolon.

Attribution
Source : Link , Question Author : rudolph9 , Answer Author : Bernhard

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