summaryrefslogtreecommitdiffstats
path: root/lib/git/diff.rb
blob: b43ecd9afe6ea7e2ec97c15d9c7acf267163de66 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
module Git
  
  # object that holds the last X commits on given branch
  class Diff
    include Enumerable
    
    @base = nil
    @from = nil
    @to = nil
    @path = nil
    
    @full_diff = nil
    @full_diff_files = nil
    @stats = nil
    
    def initialize(base, from = nil, to = nil)
      @base = base
      @from = from.to_s
      @to = to.to_s
    end
    
    def path(path)
      @path = path
      return self
    end
    
    def size
      cache_stats
      @stats[:total][:files]
    end
    
    def lines
      cache_stats
      @stats[:total][:lines]
    end
    
    def deletions
      cache_stats
      @stats[:total][:deletions]
    end
    
    def insertions
      cache_stats
      @stats[:total][:insertions]
    end
    
    def stats
      cache_stats
      @stats
    end
    
    # if file is provided and is writable, it will write the patch into the file
    def patch(file = nil)
      cache_full
      @full_diff
    end
    alias_method :to_s, :patch
    
    # enumerable methods
    
    def [](key)
      process_full
      @full_diff_files.assoc(key)[1]
    end
    
    def each
      process_full
      @full_diff_files.each do |file|
        yield file[1]
      end
    end
    
    class DiffFile
      attr_accessor :patch, :path, :mode, :src, :dst, :type
      @base = nil
      
      def initialize(base, hash)
        @base = base
        @patch = hash[:patch]
        @path = hash[:path]
        @mode = hash[:mode]
        @src = hash[:src]
        @dst = hash[:dst]
        @type = hash[:type]
      end
      
      def blob(type = :dst)
        if type == :src
          @base.object(@src) if @src != '0000000'
        else
          @base.object(@dst) if @dst != '0000000'
        end
      end
    end
    
    private
    
      def cache_full
        if !@full_diff
          @full_diff = @base.lib.diff_full(@from, @to, {:path_limiter => @path})
        end
      end
      
      def process_full
        if !@full_diff_files
          cache_full
          @full_diff_files = process_full_diff
        end
      end
      
      def cache_stats
        if !@stats
          @stats = @base.lib.diff_stats(@from, @to, {:path_limiter => @path})
        end
      end
      
      # break up @diff_full
      def process_full_diff
        final = {}
        current_file = nil
        @full_diff.split("\n").each do |line|
          if m = /diff --git a\/(.*?) b\/(.*?)/.match(line)
            current_file = m[1]
            final[current_file] = {:patch => line, :path => current_file, 
                                    :mode => '', :src => '', :dst => '', :type => 'modified'}
          else
            if m = /index (.......)\.\.(.......)( ......)*/.match(line)
              final[current_file][:src] = m[1]
              final[current_file][:dst] = m[2]
              final[current_file][:mode] = m[3].strip if m[3]
            end
            if m = /(.*?) file mode (......)/.match(line)
              final[current_file][:type] = m[1]
              final[current_file][:mode] = m[2]
            end
            final[current_file][:patch] << "\n" + line 
          end
        end
        final.map { |e| [e[0], DiffFile.new(@base, e[1])] }
      end
      
  end
end