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path: root/ui-ssdiff.c
authorRagnar Ouchterlony <ragnar@lysator.liu.se>2009-09-13 17:36:35 (UTC)
committer Lars Hjemli <hjemli@gmail.com>2009-09-16 18:17:56 (UTC)
commit40e174d5364910750413d94b5417e57d108190ef (patch) (unidiff)
tree21d71be66e1b058cecc45b861523c071fb4ee126 /ui-ssdiff.c
parent27479ac54c99584612f7246c9456119e88621eaa (diff)
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First version of side-by-side diff.
This constitutes the first prototype of a side-by-side diff. It is not possible to switch between unidiff and side-by-side diff at all at this stage. Signed-off-by: Ragnar Ouchterlony <ragnar@lysator.liu.se> Signed-off-by: Lars Hjemli <hjemli@gmail.com>
Diffstat (limited to 'ui-ssdiff.c') (more/less context) (ignore whitespace changes)
-rw-r--r--ui-ssdiff.c264
1 files changed, 264 insertions, 0 deletions
diff --git a/ui-ssdiff.c b/ui-ssdiff.c
new file mode 100644
index 0000000..3591ab4
--- a/dev/null
+++ b/ui-ssdiff.c
@@ -0,0 +1,264 @@
1#include "cgit.h"
2#include "html.h"
3#include "ui-shared.h"
4
5extern int use_ssdiff;
6
7static int current_old_line, current_new_line;
8
9struct deferred_lines {
10 int line_no;
11 char *line;
12 struct deferred_lines *next;
13};
14
15static struct deferred_lines *deferred_old, *deferred_old_last;
16static struct deferred_lines *deferred_new, *deferred_new_last;
17
18static int line_from_hunk(char *line, char type)
19{
20 char *buf1, *buf2;
21 int len;
22
23 buf1 = strchr(line, type);
24 if (buf1 == NULL)
25 return 0;
26 buf1 += 1;
27 buf2 = strchr(buf1, ',');
28 if (buf2 == NULL)
29 return 0;
30 len = buf2 - buf1;
31 buf2 = xmalloc(len + 1);
32 strncpy(buf2, buf1, len);
33 buf2[len] = '\0';
34 int res = atoi(buf2);
35 free(buf2);
36 return res;
37}
38
39static char *replace_tabs(char *line)
40{
41 char *prev_buf = line;
42 char *cur_buf;
43 int linelen = strlen(line);
44 int n_tabs = 0;
45 int i;
46 char *result;
47 char *spaces = " ";
48
49 if (linelen == 0) {
50 result = xmalloc(1);
51 result[0] = '\0';
52 return result;
53 }
54
55 for (i = 0; i < linelen; i++)
56 if (line[i] == '\t')
57 n_tabs += 1;
58 result = xmalloc(linelen + n_tabs * 8 + 1);
59 result[0] = '\0';
60
61 while (1) {
62 cur_buf = strchr(prev_buf, '\t');
63 if (!cur_buf) {
64 strcat(result, prev_buf);
65 break;
66 } else {
67 strcat(result, " ");
68 strncat(result, spaces, 8 - (strlen(result) % 8));
69 strncat(result, prev_buf, cur_buf - prev_buf);
70 }
71 prev_buf = cur_buf + 1;
72 }
73 return result;
74}
75
76static void deferred_old_add(char *line, int line_no)
77{
78 struct deferred_lines *item = xmalloc(sizeof(struct deferred_lines));
79 item->line = xstrdup(line);
80 item->line_no = line_no;
81 item->next = NULL;
82 if (deferred_old) {
83 deferred_old_last->next = item;
84 deferred_old_last = item;
85 } else {
86 deferred_old = deferred_old_last = item;
87 }
88}
89
90static void deferred_new_add(char *line, int line_no)
91{
92 struct deferred_lines *item = xmalloc(sizeof(struct deferred_lines));
93 item->line = xstrdup(line);
94 item->line_no = line_no;
95 item->next = NULL;
96 if (deferred_new) {
97 deferred_new_last->next = item;
98 deferred_new_last = item;
99 } else {
100 deferred_new = deferred_new_last = item;
101 }
102}
103
104static void print_ssdiff_line(char *class, int old_line_no, char *old_line,
105 int new_line_no, char *new_line)
106{
107 html("<tr>");
108 if (old_line_no > 0)
109 htmlf("<td class='%s'>%d </td><td class='%s'>", class,
110 old_line_no, class);
111 else
112 htmlf("<td class='%s_dark'> </td><td class='%s_dark'>", class, class);
113
114 if (old_line) {
115 old_line = replace_tabs(old_line + 1);
116 html_txt(old_line);
117 free(old_line);
118 }
119
120 html(" </td>");
121
122 if (new_line_no > 0)
123 htmlf("<td class='%s'> %d </td><td class='%s'>", class,
124 new_line_no, class);
125 else
126 htmlf("<td class='%s_dark'> </td><td class='%s_dark'>", class, class);
127
128 if (new_line) {
129 new_line = replace_tabs(new_line + 1);
130 html_txt(new_line);
131 free(new_line);
132 }
133
134 html("</td></tr>");
135}
136
137static void print_deferred_old_lines()
138{
139 struct deferred_lines *iter_old, *tmp;
140
141 iter_old = deferred_old;
142 while (iter_old) {
143 print_ssdiff_line("del", iter_old->line_no,
144 iter_old->line, -1, NULL);
145 tmp = iter_old->next;
146 free(iter_old);
147 iter_old = tmp;
148 }
149}
150
151static void print_deferred_new_lines()
152{
153 struct deferred_lines *iter_new, *tmp;
154
155 iter_new = deferred_new;
156 while (iter_new) {
157 print_ssdiff_line("add", -1, NULL, iter_new->line_no,
158 iter_new->line);
159 tmp = iter_new->next;
160 free(iter_new);
161 iter_new = tmp;
162 }
163}
164
165static void print_deferred_changed_lines()
166{
167 struct deferred_lines *iter_old, *iter_new, *tmp;
168
169 iter_old = deferred_old;
170 iter_new = deferred_new;
171 while (iter_old || iter_new) {
172 if (iter_old && iter_new)
173 print_ssdiff_line("changed", iter_old->line_no,
174 iter_old->line,
175 iter_new->line_no, iter_new->line);
176 else if (iter_old)
177 print_ssdiff_line("changed", iter_old->line_no,
178 iter_old->line, -1, NULL);
179 else if (iter_new)
180 print_ssdiff_line("changed", -1, NULL,
181 iter_new->line_no, iter_new->line);
182
183 if (iter_old) {
184 tmp = iter_old->next;
185 free(iter_old);
186 iter_old = tmp;
187 }
188
189 if (iter_new) {
190 tmp = iter_new->next;
191 free(iter_new);
192 iter_new = tmp;
193 }
194 }
195}
196
197void cgit_ssdiff_print_deferred_lines()
198{
199 if (!deferred_old && !deferred_new)
200 return;
201
202 if (deferred_old && !deferred_new)
203 print_deferred_old_lines();
204 else if (!deferred_old && deferred_new)
205 print_deferred_new_lines();
206 else
207 print_deferred_changed_lines();
208
209 deferred_old = deferred_old_last = NULL;
210 deferred_new = deferred_new_last = NULL;
211}
212
213/*
214 * print a single line returned from xdiff
215 */
216void cgit_ssdiff_line_cb(char *line, int len)
217{
218 char c = line[len - 1];
219
220 line[len - 1] = '\0';
221
222 if (line[0] == '@') {
223 current_old_line = line_from_hunk(line, '-');
224 current_new_line = line_from_hunk(line, '+');
225 }
226
227 if (line[0] == ' ') {
228 if (deferred_old || deferred_new)
229 cgit_ssdiff_print_deferred_lines();
230 print_ssdiff_line("ctx", current_old_line, line,
231 current_new_line, line);
232 current_old_line += 1;
233 current_new_line += 1;
234 } else if (line[0] == '+') {
235 deferred_new_add(line, current_new_line);
236 current_new_line += 1;
237 } else if (line[0] == '-') {
238 deferred_old_add(line, current_old_line);
239 current_old_line += 1;
240 } else if (line[0] == '@') {
241 html("<tr><td colspan='4' class='hunk'>");
242 html_txt(line);
243 html("</td></tr>");
244 } else {
245 html("<tr><td colspan='4' class='ctx'>");
246 html_txt(line);
247 html("</td></tr>");
248 }
249 line[len - 1] = c;
250}
251
252void cgit_ssdiff_header()
253{
254 current_old_line = 0;
255 current_new_line = 0;
256 html("<table class='ssdiff'>");
257}
258
259void cgit_ssdiff_footer()
260{
261 if (deferred_old || deferred_new)
262 cgit_ssdiff_print_deferred_lines();
263 html("</table>");
264}