refining repositories a little, there are a few common layouts. We will start with flat ones.

qwandry.rb

@@ -17,6 +17,24 @@ if ARGV.length != 1
   exit(-1)
 end
 
+##
+class Repository
+  def initialize(path)
+    @path = path.chomp('/')
+  end
+  
+  def scan(name)
+    []
+  end
+end
+
+class FlatRepository < Repository
+  def scan(name)
+    Dir["#{@path}/*"].select{|path| path if File.basename(path).start_with?(name)}
+  end
+end
+
+##
 load('repositories.rb')
 
 name = ARGV.pop
@@ -24,7 +42,7 @@ candidates = []
 
 @repositories.each do |set, repos|
   repos.each do |repo|
-    Dir["#{repo}/*"].each{|path| candidates << path if File.basename(path).start_with?(name)}
+    candidates.concat(repo.scan(name))
   end
 end
 
@@ -33,6 +51,6 @@ candidates.each_with_index do |path, index|
 end
 
 print ">> "
-index = gets
-path = candidates[index.to_i-1]
+index = gets.to_i-1
+path = candidates[index]
 `mate #{path}`

repositories.rb

@@ -4,15 +4,11 @@ def which(bin)
   `which #{bin}`.chomp
 end
 
-def add(repository, path=nil)
-  if !path
-    path = repository
-    repository = 'default'
-  end
-
-  @repositories[repository] << path 
+def add(label, path)
+  @repositories[label.to_s] << FlatRepository.new(path)
 end
 
 if which('ruby') == '/Users/adam/.rvm/rubies/ruby-1.9.1-p378/bin/ruby'
-  add 'gem', '/Users/adam/.rvm/gems/ruby-1.9.1-p378/gems/'
+  add :gem,  '/Users/adam/.rvm/gems/ruby-1.9.1-p378/gems/'
+  add :ruby, '/Users/adam/.rvm/rubies/ruby-1.9.1-p378/lib/ruby/1.9.1/'
 end