-rw-r--r-- | ui-diff.c | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/ui-diff.c b/ui-diff.c new file mode 100644 index 0000000..0bd9ade --- a/dev/null +++ b/ui-diff.c | |||
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1 | /* ui-diff.c: show diff between two blobs | ||
2 | * | ||
3 | * Copyright (C) 2006 Lars Hjemli | ||
4 | * | ||
5 | * Licensed under GNU General Public License v2 | ||
6 | * (see COPYING for full license text) | ||
7 | */ | ||
8 | |||
9 | #include "cgit.h" | ||
10 | #include "xdiff.h" | ||
11 | |||
12 | char *diff_buffer; | ||
13 | int diff_buffer_size; | ||
14 | |||
15 | |||
16 | /* | ||
17 | * print a single line returned from xdiff | ||
18 | */ | ||
19 | static void print_line(char *line, int len) | ||
20 | { | ||
21 | char *class = "ctx"; | ||
22 | char c = line[len-1]; | ||
23 | |||
24 | if (line[0] == '+') | ||
25 | class = "add"; | ||
26 | else if (line[0] == '-') | ||
27 | class = "del"; | ||
28 | else if (line[0] == '@') | ||
29 | class = "hunk"; | ||
30 | |||
31 | htmlf("<div class='%s'>", class); | ||
32 | line[len-1] = '\0'; | ||
33 | html_txt(line); | ||
34 | html("</div>"); | ||
35 | line[len-1] = c; | ||
36 | } | ||
37 | |||
38 | /* | ||
39 | * Receive diff-buffers from xdiff and concatenate them as | ||
40 | * needed across multiple callbacks. | ||
41 | * | ||
42 | * This is basically a copy of xdiff-interface.c/xdiff_outf(), | ||
43 | * ripped from git and modified to use globals instead of | ||
44 | * a special callback-struct. | ||
45 | */ | ||
46 | int diff_cb(void *priv_, mmbuffer_t *mb, int nbuf) | ||
47 | { | ||
48 | int i; | ||
49 | |||
50 | for (i = 0; i < nbuf; i++) { | ||
51 | if (mb[i].ptr[mb[i].size-1] != '\n') { | ||
52 | /* Incomplete line */ | ||
53 | diff_buffer = xrealloc(diff_buffer, | ||
54 | diff_buffer_size + mb[i].size); | ||
55 | memcpy(diff_buffer + diff_buffer_size, | ||
56 | mb[i].ptr, mb[i].size); | ||
57 | diff_buffer_size += mb[i].size; | ||
58 | continue; | ||
59 | } | ||
60 | |||
61 | /* we have a complete line */ | ||
62 | if (!diff_buffer) { | ||
63 | print_line(mb[i].ptr, mb[i].size); | ||
64 | continue; | ||
65 | } | ||
66 | diff_buffer = xrealloc(diff_buffer, | ||
67 | diff_buffer_size + mb[i].size); | ||
68 | memcpy(diff_buffer + diff_buffer_size, mb[i].ptr, mb[i].size); | ||
69 | print_line(diff_buffer, diff_buffer_size + mb[i].size); | ||
70 | free(diff_buffer); | ||
71 | diff_buffer = NULL; | ||
72 | diff_buffer_size = 0; | ||
73 | } | ||
74 | if (diff_buffer) { | ||
75 | print_line(diff_buffer, diff_buffer_size); | ||
76 | free(diff_buffer); | ||
77 | diff_buffer = NULL; | ||
78 | diff_buffer_size = 0; | ||
79 | } | ||
80 | return 0; | ||
81 | } | ||
82 | |||
83 | static int load_mmfile(mmfile_t *file, const unsigned char *sha1) | ||
84 | { | ||
85 | char type[20]; | ||
86 | |||
87 | if (is_null_sha1(sha1)) { | ||
88 | file->ptr = (char *)""; | ||
89 | file->size = 0; | ||
90 | } else { | ||
91 | file->ptr = read_sha1_file(sha1, type, &file->size); | ||
92 | } | ||
93 | return 1; | ||
94 | } | ||
95 | |||
96 | static void run_diff(const unsigned char *sha1, const unsigned char *sha2) | ||
97 | { | ||
98 | mmfile_t file1, file2; | ||
99 | xpparam_t diff_params; | ||
100 | xdemitconf_t emit_params; | ||
101 | xdemitcb_t emit_cb; | ||
102 | |||
103 | if (!load_mmfile(&file1, sha1) || !load_mmfile(&file2, sha2)) { | ||
104 | cgit_print_error("Unable to load files for diff"); | ||
105 | return; | ||
106 | } | ||
107 | |||
108 | diff_params.flags = XDF_NEED_MINIMAL; | ||
109 | |||
110 | emit_params.ctxlen = 3; | ||
111 | emit_params.flags = XDL_EMIT_FUNCNAMES; | ||
112 | |||
113 | emit_cb.outf = diff_cb; | ||
114 | |||
115 | xdl_diff(&file1, &file2, &diff_params, &emit_params, &emit_cb); | ||
116 | } | ||
117 | |||
118 | |||
119 | |||
120 | void cgit_print_diff(const char *old_hex, const char *new_hex) | ||
121 | { | ||
122 | unsigned char sha1[20], sha2[20]; | ||
123 | |||
124 | get_sha1(old_hex, sha1); | ||
125 | get_sha1(new_hex, sha2); | ||
126 | |||
127 | html("<h2>diff</h2>\n"); | ||
128 | html("<table class='diff'><tr><td>"); | ||
129 | run_diff(sha1, sha2); | ||
130 | html("</td></tr></table>"); | ||
131 | } | ||