ui-diff.c

   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
  11
  12 /*
  13  * print a single line returned from xdiff
  14  */
  15 static void print_line(char *line, int len)
  16 {
  17         char *class = "ctx";
  18         char c = line[len-1];
  19
  20         if (line[0] == '+')
  21                 class = "add";
  22         else if (line[0] == '-')
  23                 class = "del";
  24         else if (line[0] == '@')
  25                 class = "hunk";
  26
  27         htmlf("<div class='%s'>", class);
  28         line[len-1] = '\0';
  29         html_txt(line);
  30         html("</div>");
  31         line[len-1] = c;
  32 }
  33
  34 static void header(unsigned char *sha1, char *path1, int mode1,
  35                    unsigned char *sha2, char *path2, int mode2)
  36 {
  37         char *abbrev1, *abbrev2;
  38         int subproject;
  39
  40         subproject = (S_ISDIRLNK(mode1) || S_ISDIRLNK(mode2));
  41         html("<div class='head'>");
  42         html("diff --git a/");
  43         html_txt(path1);
  44         html(" b/");
  45         html_txt(path2);
  46
  47         if (is_null_sha1(sha1))
  48                 path1 = "dev/null";
  49         if (is_null_sha1(sha2))
  50                 path2 = "dev/null";
  51
  52         if (mode1 == 0)
  53                 htmlf("<br/>new file mode %.6o", mode2);
  54
  55         if (mode2 == 0)
  56                 htmlf("<br/>deleted file mode %.6o", mode1);
  57
  58         if (!subproject) {
  59                 abbrev1 = xstrdup(find_unique_abbrev(sha1, DEFAULT_ABBREV));
  60                 abbrev2 = xstrdup(find_unique_abbrev(sha2, DEFAULT_ABBREV));
  61                 htmlf("<br/>index %s..%s", abbrev1, abbrev2);
  62                 free(abbrev1);
  63                 free(abbrev2);
  64                 if (mode1 != 0 && mode2 != 0) {
  65                         htmlf(" %.6o", mode1);
  66                         if (mode2 != mode1)
  67                                 htmlf("..%.6o", mode2);
  68                 }
  69                 html("<br/>--- a/");
  70                 html_txt(path1);
  71                 html("<br/>+++ b/");
  72                 html_txt(path2);
  73         }
  74         html("</div>");
  75 }
  76
  77 static void filepair_cb(struct diff_filepair *pair)
  78 {
  79         header(pair->one->sha1, pair->one->path, pair->one->mode,
  80                pair->two->sha1, pair->two->path, pair->two->mode);
  81         if (S_ISDIRLNK(pair->one->mode) || S_ISDIRLNK(pair->two->mode)) {
  82                 if (S_ISDIRLNK(pair->one->mode))
  83                         print_line(fmt("-Subproject %s", sha1_to_hex(pair->one->sha1)), 52);
  84                 if (S_ISDIRLNK(pair->two->mode))
  85                         print_line(fmt("+Subproject %s", sha1_to_hex(pair->two->sha1)), 52);
  86                 return;
  87         }
  88         if (cgit_diff_files(pair->one->sha1, pair->two->sha1, print_line))
  89                 cgit_print_error("Error running diff");
  90 }
  91
  92 void cgit_print_diff(const char *head, const char *old_hex, const char *new_hex, char *path)
  93 {
  94         unsigned char sha1[20], sha2[20];
  95         enum object_type type;
  96         unsigned long size;
  97         struct commit *commit;
  98
  99         html("<table class='diff'>");
 100         html("<tr><td>");
 101
 102         if (head && !old_hex && !new_hex) {
 103                 get_sha1(head, sha1);
 104                 commit = lookup_commit_reference(sha1);
 105                 if (commit && !parse_commit(commit))
 106                         cgit_diff_commit(commit, filepair_cb);
 107                 else
 108                         cgit_print_error(fmt("Bad commit: %s", head));
 109                 html("</td></tr>");
 110                 html("</table>");
 111                 return;
 112         }
 113
 114         get_sha1(old_hex, sha1);
 115         get_sha1(new_hex, sha2);
 116
 117         type = sha1_object_info(sha1, &size);
 118         if (type == OBJ_BAD) {
 119                 type = sha1_object_info(sha2, &size);
 120                 if (type == OBJ_BAD) {
 121                         cgit_print_error(fmt("Bad object names: %s, %s", old_hex, new_hex));
 122                         return;
 123                 }
 124         }
 125
 126         switch(type) {
 127         case OBJ_BLOB:
 128                 header(sha1, path, 0644, sha2, path, 0644);
 129                 if (cgit_diff_files(sha1, sha2, print_line))
 130                         cgit_print_error("Error running diff");
 131                 break;
 132         case OBJ_TREE:
 133                 cgit_diff_tree(sha1, sha2, filepair_cb);
 134                 break;
 135         default:
 136                 cgit_print_error(fmt("Unhandled object type: %s",
 137                                      typename(type)));
 138                 break;
 139         }
 140         html("</td></tr>");
 141         html("</table>");
 142 }