From 4441c0e8a2763a21d57d3a214045e660a28df07a Mon Sep 17 00:00:00 2001
From: Matthias Georgi <matti.georgi@gmail.com>
Date: Fri, 5 Dec 2008 10:41:47 +0100
Subject: [PATCH] init

---
 lib/store.rb | 101 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 101 insertions(+)
 create mode 100644 lib/store.rb

diff --git a/lib/store.rb b/lib/store.rb
new file mode 100644
index 0000000..7383d1c
--- /dev/null
+++ b/lib/store.rb
@@ -0,0 +1,101 @@
+module Kontrol
+
+  class Store
+
+    module FileCache
+
+      def real_path(path)
+        "#{self.path == '/' ? '.' : self.path}/#{path}"
+      end
+
+      def changed_on_disk?(path)
+        real_path = real_path(path)
+        return false if not File.exist?(real_path)
+        time = self.time[path]
+        time.nil? or time != File.mtime(real_path)
+      end
+
+      def load_file(path, blob = tree / path)
+        real_path = real_path(path)
+        time[path] = File.mtime(real_path)
+        self.data[path] = @reader.call(path, File.read(real_path), tree / path)
+      end
+
+    end
+
+    include Enumerable
+
+    attr_reader :repo, :index, :path, :tree, :data, :time, :reader, :writer
+
+    def initialize(repo, path = '/', file_cache = false, &block)
+      @repo = repo.is_a?(String) ? Grit::Repo.new(repo) : repo
+      @index = @repo.index
+      @path = path
+      @tree = @repo.tree / path
+      @data = {}
+      @time = {}
+      @reader = block || lambda { |path, data, blob| data }
+      @writer = lambda { |path, data| data }
+
+      extend FileCache if file_cache
+      find_files_in(tree)
+    end
+
+    def [](path)
+      changed_on_disk?(path) ? load_file(path) : data[path]
+    end
+
+    def []=(path, data)
+      @data[path] = data
+    end
+
+    def delete(path)
+      @data.delete(path)
+    end
+
+    def commit(message="")
+      @data.each do |path, data|
+        index.add(path, @writer.call(path, data))
+      end
+      
+      head = repo.heads.first
+      index.commit(message, head ? head.commit.id : nil)
+    end
+
+    def load
+      @tree = repo.tree / path
+      data.clear
+      time.clear
+      find_files_in(tree)
+    end
+
+    def each(&block)
+      data.values.each(&block)
+    end
+
+    private
+
+    def changed_on_disk?(path)
+      false
+    end
+    
+    def load_file(path, blob = tree / path)
+      self.data[path] = reader.call(path, blob.data, blob)
+    end
+
+    def find_files_in(tree, parent = [])
+      for file in tree.contents
+        path = parent + [file.name]
+        if file.is_a?(Grit::Tree)
+          find_files_in(file, path)
+        else
+          name = path.join('/')
+          load_file(name) if !data[name] and changed_on_disk?(name)
+        end
+      end
+    end
+
+  end
+
+
+end