ui-ssdiff.c

   1 #include "cgit.h"
   2 #include "html.h"
   3 #include "ui-shared.h"
   4
   5 extern int use_ssdiff;
   6
   7 static int current_old_line, current_new_line;
   8
   9 struct deferred_lines {
  10         int line_no;
  11         char *line;
  12         struct deferred_lines *next;
  13 };
  14
  15 static struct deferred_lines *deferred_old, *deferred_old_last;
  16 static struct deferred_lines *deferred_new, *deferred_new_last;
  17
  18 static 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
  39 static 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
  76 static 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
  90 static 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
 104 static 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
 137 static 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
 151 static 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
 165 static 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
 197 void 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  */
 216 void 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
 252 void cgit_ssdiff_header()
 253 {
 254         current_old_line = 0;
 255         current_new_line = 0;
 256         html("<table class='ssdiff'>");
 257 }
 258
 259 void cgit_ssdiff_footer()
 260 {
 261         if (deferred_old || deferred_new)
 262                 cgit_ssdiff_print_deferred_lines();
 263         html("</table>");
 264 }