1 slot.put_into("title", _"Diff")

2

3 local old_draft_id = param.get("old_draft_id", atom.integer)

4 local new_draft_id = param.get("new_draft_id", atom.integer)

5

6 if not old_draft_id or not new_draft_id then

7 slot.put( _"Please choose two versions of the draft to compare")

8 return

9 end

10

11 if old_draft_id == new_draft_id then

12 slot.put( _"Please choose two different versions of the draft to compare")

13 return

14 end

15

16 if old_draft_id > new_draft_id then

17 local tmp = old_draft_id

18 old_draft_id = new_draft_id

19 new_draft_id = tmp

20 end

21

22 local old_draft = Draft:by_id(old_draft_id)

23 local new_draft = Draft:by_id(new_draft_id)

24

25 local old_draft_content = string.gsub(string.gsub(old_draft.content, "\n", " ###ENTER###\n"), " ", "\n")

26 local new_draft_content = string.gsub(string.gsub(new_draft.content, "\n", " ###ENTER###\n"), " ", "\n")

27

28 local key = multirand.string(26, "123456789bcdfghjklmnpqrstvwxyz");

29

30 local old_draft_filename = encode.file_path(request.get_app_basepath(), 'tmp', "diff-" .. key .. "-old.tmp")

31 local new_draft_filename = encode.file_path(request.get_app_basepath(), 'tmp', "diff-" .. key .. "-new.tmp")

32

33 local old_draft_file = assert(io.open(old_draft_filename, "w"))

34 old_draft_file:write(old_draft_content)

35 old_draft_file:write("\n")

36 old_draft_file:close()

37

38 local new_draft_file = assert(io.open(new_draft_filename, "w"))

39 new_draft_file:write(new_draft_content)

40 new_draft_file:write("\n")

41 new_draft_file:close()

42

43 local output, err, status = os.pfilter(nil, "sh", "-c", "diff -U 1000000000 '" .. old_draft_filename .. "' '" .. new_draft_filename .. "' | grep -v ^--- | grep -v ^+++ | grep -v ^@")

44

45 os.remove(old_draft_filename)

46 os.remove(new_draft_filename)

47

48 local last_state = "first_run"

49

50 local function process_line(line)

51 local state_char = string.sub(line, 1, 1)

52 local state

53 if state_char == "+" then

54 state = "added"

55 elseif state_char == "-" then

56 state = "removed"

57 elseif state_char == " " then

58 state = "unchanged"

59 end

60 local state_changed = false

61 if state ~= last_state then

62 if last_state ~= "first_run" then

63 slot.put("</span> ")

64 end

65 last_state = state

66 state_changed = true

67 slot.put("<span class=\"diff_" .. tostring(state) .. "\">")

68 end

69

70 line = string.sub(line, 2, #line)

71 if line ~= "###ENTER###" then

72 if not state_changed then

73 slot.put(" ")

74 end

75 slot.put(line)

76 else

77 slot.put("<br />")

78 end

79 end

80

81 if not status then

82 ui.field.text{ value = _"The drafts do not differ" }

83 else

84 ui.container{

85 tag = "div",

86 attr = { class = "diff" },

87 content = function()

88 output = output:gsub("[^\n\r]+", function(line)

89 process_line(line)

90 end)

91 end

92 }

93 end

94