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("<tr><td>");
  42         html("<div class='head'>");
  43         html("diff --git a/");
  44         html_txt(path1);
  45         html(" b/");
  46         html_txt(path2);
  47
  48         if (is_null_sha1(sha1))
  49                 path1 = "dev/null";
  50         if (is_null_sha1(sha2))
  51                 path2 = "dev/null";
  52
  53         if (mode1 == 0)
  54                 htmlf("<br/>new file mode %.6o", mode2);
  55
  56         if (mode2 == 0)
  57                 htmlf("<br/>deleted file mode %.6o", mode1);
  58
  59         if (!subproject) {
  60                 abbrev1 = xstrdup(find_unique_abbrev(sha1, DEFAULT_ABBREV));
  61                 abbrev2 = xstrdup(find_unique_abbrev(sha2, DEFAULT_ABBREV));
  62                 htmlf("<br/>index %s..%s", abbrev1, abbrev2);
  63                 free(abbrev1);
  64                 free(abbrev2);
  65                 if (mode1 != 0 && mode2 != 0) {
  66                         htmlf(" %.6o", mode1);
  67                         if (mode2 != mode1)
  68                                 htmlf("..%.6o", mode2);
  69                 }
  70                 html("<br/>--- a/");
  71                 html_txt(path1);
  72                 html("<br/>+++ b/");
  73                 html_txt(path2);
  74         }
  75         html("</div>");
  76 }
  77
  78 static void filepair_cb(struct diff_filepair *pair)
  79 {
  80         header(pair->one->sha1, pair->one->path, pair->one->mode,
  81                pair->two->sha1, pair->two->path, pair->two->mode);
  82         if (S_ISDIRLNK(pair->one->mode) || S_ISDIRLNK(pair->two->mode)) {
  83                 if (S_ISDIRLNK(pair->one->mode))
  84                         print_line(fmt("-Subproject %s", sha1_to_hex(pair->one->sha1)), 52);
  85                 if (S_ISDIRLNK(pair->two->mode))
  86                         print_line(fmt("+Subproject %s", sha1_to_hex(pair->two->sha1)), 52);
  87                 return;
  88         }
  89         if (cgit_diff_files(pair->one->sha1, pair->two->sha1, print_line))
  90                 cgit_print_error("Error running diff");
  91 }
  92
  93 void cgit_print_diff(const char *head, const char *old_hex, const char *new_hex, char *path)
  94 {
  95         unsigned char sha1[20], sha2[20];
  96         enum object_type type;
  97         unsigned long size;
  98         struct commit *commit;
  99
 100         if (head && !old_hex && !new_hex) {
 101                 get_sha1(head, sha1);
 102                 commit = lookup_commit_reference(sha1);
 103                 if (commit && !parse_commit(commit)) {
 104                         html("<table class='diff'>");
 105                         cgit_diff_commit(commit, filepair_cb);
 106                         html("</td></tr></table>");
 107                 }
 108                 return;
 109         }
 110
 111         get_sha1(old_hex, sha1);
 112         get_sha1(new_hex, sha2);
 113
 114         type = sha1_object_info(sha1, &size);
 115         if (type == OBJ_BAD) {
 116                 type = sha1_object_info(sha2, &size);
 117                 if (type == OBJ_BAD) {
 118                         cgit_print_error(fmt("Bad object names: %s, %s", old_hex, new_hex));
 119                         return;
 120                 }
 121         }
 122
 123         html("<table class='diff'>");
 124         switch(type) {
 125         case OBJ_BLOB:
 126                 html("<tr><td>");
 127                 header(sha1, path, 0644, sha2, path, 0644);
 128                 if (cgit_diff_files(sha1, sha2, print_line))
 129                         cgit_print_error("Error running diff");
 130                 html("</tr></td>");
 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></table>");
 141 }