Add the first version of the code.

Documentation is still based on range-search.vim and the convenient
normal mode keystrokes do not work, but we're getting there.

Rakefile

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+# Rakefile copied from https://github.com/mileszs/ack.vim (license is
+# unknown).
+# Modified by Shlomi Fish, while disclaiming all rights to the modifications.
+#
+# Added by Josh Nichols, a.k.a. technicalpickles
+require 'rake'
+
+plugin_name = 'add-to-word-search'
+files = ['doc/#{plugin_name}.txt', 'plugin/#{plugin_name}.vim']
+
+desc 'Install plugin and documentation'
+task :install do
+  vimfiles = if ENV['VIMFILES']
+               ENV['VIMFILES']
+             elsif RUBY_PLATFORM =~ /(win|w)32$/
+               File.expand_path("~/vimfiles")
+             else
+               File.expand_path("~/.vim")
+             end
+  files.each do |file|
+    target_file = File.join(vimfiles, file)
+    FileUtils.mkdir_p File.dirname(target_file)
+    FileUtils.cp file, target_file
+
+    puts "  Copied #{file} to #{target_file}"
+  end
+
+end

doc/add-to-word-search.txt

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+*range-search.txt*  Plugin for searching inside ranges
+
+==============================================================================
+Author:  Shlomi Fish < http://www.shlomifish.org/ >
+License: MIT/X11 ( http://www.opensource.org/licenses/mit-license.php )
+
+==============================================================================
+
+:[range]Rs {pattern}                                             *:Rs*
+
+    Searches the range for the pattern.
+
+:[range]RS {pattern}                                             *:RS*
+
+    Same as :Rs.

plugin/add-to-word-search.vim

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+" Author: Shlomi Fish
+" Homepage: http://www.shlomifish.org/
+" Email: shlomif@cpan.org
+" Date: 27 February 2012
+" License: MIT X11 ( http://www.opensource.org/licenses/mit-license.php )
+" Version: 0.2.0
+"
+" Motivation for this plugin:
+" ---------------------------
+"
+" When searching through code I often found that I need to add more related
+" terms to the search. For example, if I found a call to a function inside
+" a different one, or when a type is typedef'ed to something else (in C).
+" This module aims to allow you to convenietly add search terms to the search
+" so you can find all the occurences of all of them.
+" To use: put this in ~/.vim/plugin/ 
+"
+" Then you can type <Leader>** to add a search term to the search (mnemonic -
+" * is the namespace and '*' searches forward for a keyword.
+
+function! Append_pat_to_search(mypat)
+    let @/ = @/ . a:mypat
+endfunction
+
+" This recipe is based on:
+"
+" http://stackoverflow.com/questions/7093397/vim-equivalent-of-preg-quote-and-quotemeta
+function! Quotemeta(mypat)
+    return '\V' . substitute(a:mypat,'\\','\\\\','g') . '\m'
+endfunction
+
+function! Append_keyword_to_search(mypat)
+    call Append_pat_to_search('\<' . Quotemeta(mypat) . '\>')
+endfunction
+
+" command -range -nargs=1 Rs call Range_Search(<f-args>,<line1>,<line2>)
+" command -range -nargs=1 RS call Range_Search(<f-args>,<line1>,<line2>)
+
+" Changelog:
+"
+" 0.2.0:
+"   first release.