Source file diff_configuration.ml

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
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
open Core

(* This is the default patdiff configuration, except whitespace is toggled to
   true. See patdiff/lib/configuration record for options.*)
let default context =
  Format.sprintf
    {|;; -*- scheme -*-
;; patdiff Configuration file

(
 (context %d)

 (line_same
  ((prefix ((text " |") (style ((bg bright_black) (fg black)))))))

 (keep_whitespace true)

 (line_old
  ((prefix ((text "-|") (style ((bg red)(fg black)))))
   (style ((fg red)))
   (word_same (dim))))

 (line_new
  ((prefix ((text "+|") (style ((bg green)(fg black)))))
   (style ((fg green)))))

 (line_unified
  ((prefix ((text "!|") (style ((bg yellow)(fg black)))))))

 (header_old
  ((prefix ((text "------ ") (style ((fg red)))))
   (style (bold))))

 (header_new
  ((prefix ((text "++++++ ") (style ((fg green)))))
   (style (bold))))

 (hunk
  ((prefix ((text "@|") (style ((bg bright_black) (fg black)))))
   (suffix ((text " ============================================================") (style ())))
   (style (bold))))
)|} context

let terminal ?(context = 16) () =
  Patdiff.Configuration.On_disk.t_of_sexp (Sexp.of_string (default context))
  |> Patdiff.Configuration.parse

let diff_configuration =
  {|;; -*- scheme -*-
;; patdiff Configuration file

(
 (context 1)

 (line_same
  ((prefix ((text " |") (style ((bg bright_black) (fg black)))))))

 (line_old
  ((prefix ((text "-|") (style ((bg red)(fg black)))))
   (style ((fg red)))
   (word_same (dim))))

 (line_new
  ((prefix ((text "+|") (style ((bg green)(fg black)))))
   (style ((fg green)))))

 (line_unified
  ((prefix ((text "!|") (style ((bg yellow)(fg black)))))))

 (header_old
  ((prefix ((text "------ ") (style ((fg red)))))
   (style (bold))))

 (header_new
  ((prefix ((text "++++++ ") (style ((fg green)))))
   (style (bold))))

 (hunk
  ((prefix ((text "@|") (style ((bg bright_black) (fg black)))))
   (suffix ((text " =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=") (style ())))
   (style (bold))))
)|}

let match_diff () =
  Patdiff.Configuration.On_disk.t_of_sexp (Sexp.of_string diff_configuration)
  |> Patdiff.Configuration.parse

(* Needs (unrefined true), otherwise it just prints without colors. Unrefined true
   will diff on a line basis. line_unified is ignored for unrefined, but
   will still create a prefix width of 2 in the diff if it is "!|" *)
let plain_configuration =
  {|;; -*- scheme -*-
;; patdiff Configuration file

(
 (context 3)
;; unrefined: output every changed line. unrefined false will merge + and - lines if they are similar.
 (unrefined true)

 (line_same
  ((prefix ((text " ") (style ())))))

 (line_old
  ((prefix ((text "-") (style ())))
   (style ())
   (word_same (dim))))

 (line_new
  ((prefix ((text "+") (style ())))
   (style ())))

 (header_old
  ((prefix ((text "--- ") (style ())))
   (style ())))

 (header_new
  ((prefix ((text "+++ ") (style ())))
   (style ())))

 (hunk
  ((prefix ((text "@@ ") (style ())))
   (suffix ((text " @@") (style ())))
   (style ())))
)
|}

let plain () =
  Patdiff.Configuration.On_disk.t_of_sexp (Sexp.of_string plain_configuration)
  |> Patdiff.Configuration.parse

type kind =
  | Plain
  | Colored
  | Html
  | Default
  | Match_only

let get_diff kind source_path source_content result =
  let open Patdiff in
  let source_path =
    match source_path with
    | Some path -> path
    | None -> "/dev/null"
  in
  let configuration =
    match kind with
    | Plain -> plain ()
    | Colored
    | Html
    | Default -> terminal ~context:3 ()
    | Match_only -> match_diff ()
  in
  let prev = Patdiff.Diff_input.{ name = source_path; text = source_content } in
  let next = Patdiff.Diff_input.{ name = source_path; text = result } in

  Compare_core.diff_strings ~print_global_header:true configuration ~prev ~next
  |> function
  | `Different diff -> Some diff
  | `Same -> None