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,
  35                    unsigned char *sha2, char *path2)
  36 {
  37         char *abbrev1, *abbrev2;
  38         if (is_null_sha1(sha1))
  39                 path1 = "dev/null";
  40         if (is_null_sha1(sha2))
  41                 path2 = "dev/null";
  42         html("<tr><td>");
  43         html("<div class='head'>");
  44         html("diff --git a/");
  45         html_txt(path1);
  46         html(" b/");
  47         html_txt(path2);
  48         abbrev1 = xstrdup(find_unique_abbrev(sha1, DEFAULT_ABBREV));
  49         abbrev2 = xstrdup(find_unique_abbrev(sha2, DEFAULT_ABBREV));
  50         htmlf("\nindex %s..%s", abbrev1, abbrev2);
  51         free(abbrev1);
  52         free(abbrev2);
  53         html("\n--- a/");
  54         html_txt(path1);
  55         html("\n+++ b/");
  56         html_txt(path2);
  57         html("</div>");
  58 }
  59
  60 static void filepair_cb(struct diff_filepair *pair)
  61 {
  62         header(pair->one->sha1, pair->one->path,
  63                pair->two->sha1, pair->two->path);
  64         if (cgit_diff_files(pair->one->sha1, pair->two->sha1, print_line))
  65                 cgit_print_error("Error running diff");
  66         html("</tr></td>");
  67 }
  68
  69 void cgit_print_diff(const char *head, const char *old_hex, const char *new_hex, char *path)
  70 {
  71         unsigned char sha1[20], sha2[20];
  72         enum object_type type;
  73         unsigned long size;
  74         struct commit *commit;
  75
  76         if (head && !old_hex && !new_hex) {
  77                 get_sha1(head, sha1);
  78                 commit = lookup_commit_reference(sha1);
  79                 if (commit && !parse_commit(commit)) {
  80                         html("<table class='diff'>");
  81                         cgit_diff_commit(commit, filepair_cb);
  82                         html("</td></tr></table>");
  83                 }
  84                 return;
  85         }
  86
  87         get_sha1(old_hex, sha1);
  88         get_sha1(new_hex, sha2);
  89
  90         type = sha1_object_info(sha1, &size);
  91         if (type == OBJ_BAD) {
  92                 type = sha1_object_info(sha2, &size);
  93                 if (type == OBJ_BAD) {
  94                         cgit_print_error(fmt("Bad object names: %s, %s", old_hex, new_hex));
  95                         return;
  96                 }
  97         }
  98
  99         html("<table class='diff'>");
 100         switch(type) {
 101         case OBJ_BLOB:
 102                 html("<tr><td>");
 103                 header(sha1, path, sha2, path);
 104                 if (cgit_diff_files(sha1, sha2, print_line))
 105                         cgit_print_error("Error running diff");
 106                 html("</tr></td>");
 107                 break;
 108         case OBJ_TREE:
 109                 cgit_diff_tree(sha1, sha2, filepair_cb);
 110                 break;
 111         default:
 112                 cgit_print_error(fmt("Unhandled object type: %s",
 113                                      typename(type)));
 114                 break;
 115         }
 116         html("</td></tr></table>");
 117 }