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 unsigned char old_rev_sha1[20];
  13 unsigned char new_rev_sha1[20];
  14
  15 /*
  16  * print a single line returned from xdiff
  17  */
  18 static void print_line(char *line, int len)
  19 {
  20         char *class = "ctx";
  21         char c = line[len-1];
  22
  23         if (line[0] == '+')
  24                 class = "add";
  25         else if (line[0] == '-')
  26                 class = "del";
  27         else if (line[0] == '@')
  28                 class = "hunk";
  29
  30         htmlf("<div class='%s'>", class);
  31         line[len-1] = '\0';
  32         html_txt(line);
  33         html("</div>");
  34         line[len-1] = c;
  35 }
  36
  37 static void header(unsigned char *sha1, char *path1, int mode1,
  38                    unsigned char *sha2, char *path2, int mode2)
  39 {
  40         char *abbrev1, *abbrev2;
  41         int subproject;
  42
  43         subproject = (S_ISGITLINK(mode1) || S_ISGITLINK(mode2));
  44         html("<div class='head'>");
  45         html("diff --git a/");
  46         html_txt(path1);
  47         html(" b/");
  48         html_txt(path2);
  49
  50         if (is_null_sha1(sha1))
  51                 path1 = "dev/null";
  52         if (is_null_sha1(sha2))
  53                 path2 = "dev/null";
  54
  55         if (mode1 == 0)
  56                 htmlf("<br/>new file mode %.6o", mode2);
  57
  58         if (mode2 == 0)
  59                 htmlf("<br/>deleted file mode %.6o", mode1);
  60
  61         if (!subproject) {
  62                 abbrev1 = xstrdup(find_unique_abbrev(sha1, DEFAULT_ABBREV));
  63                 abbrev2 = xstrdup(find_unique_abbrev(sha2, DEFAULT_ABBREV));
  64                 htmlf("<br/>index %s..%s", abbrev1, abbrev2);
  65                 free(abbrev1);
  66                 free(abbrev2);
  67                 if (mode1 != 0 && mode2 != 0) {
  68                         htmlf(" %.6o", mode1);
  69                         if (mode2 != mode1)
  70                                 htmlf("..%.6o", mode2);
  71                 }
  72                 html("<br/>--- a/");
  73                 if (mode1 != 0)
  74                         cgit_tree_link(path1, NULL, NULL, cgit_query_head,
  75                                        sha1_to_hex(old_rev_sha1), path1);
  76                 else
  77                         html_txt(path1);
  78                 html("<br/>+++ b/");
  79                 if (mode2 != 0)
  80                         cgit_tree_link(path2, NULL, NULL, cgit_query_head,
  81                                        sha1_to_hex(new_rev_sha1), path2);
  82                 else
  83                         html_txt(path2);
  84         }
  85         html("</div>");
  86 }
  87
  88 static void filepair_cb(struct diff_filepair *pair)
  89 {
  90         header(pair->one->sha1, pair->one->path, pair->one->mode,
  91                pair->two->sha1, pair->two->path, pair->two->mode);
  92         if (S_ISGITLINK(pair->one->mode) || S_ISGITLINK(pair->two->mode)) {
  93                 if (S_ISGITLINK(pair->one->mode))
  94                         print_line(fmt("-Subproject %s", sha1_to_hex(pair->one->sha1)), 52);
  95                 if (S_ISGITLINK(pair->two->mode))
  96                         print_line(fmt("+Subproject %s", sha1_to_hex(pair->two->sha1)), 52);
  97                 return;
  98         }
  99         if (cgit_diff_files(pair->one->sha1, pair->two->sha1, print_line))
 100                 cgit_print_error("Error running diff");
 101 }
 102
 103 void cgit_print_diff(const char *new_rev, const char *old_rev, const char *prefix)
 104 {
 105         enum object_type type;
 106         unsigned long size;
 107         struct commit *commit, *commit2;
 108
 109         if (!new_rev)
 110                 new_rev = cgit_query_head;
 111         get_sha1(new_rev, new_rev_sha1);
 112         type = sha1_object_info(new_rev_sha1, &size);
 113         if (type == OBJ_BAD) {
 114                 cgit_print_error(fmt("Bad object name: %s", new_rev));
 115                 return;
 116         }
 117         if (type != OBJ_COMMIT) {
 118                 cgit_print_error(fmt("Unhandled object type: %s",
 119                                      typename(type)));
 120                 return;
 121         }
 122
 123         commit = lookup_commit_reference(new_rev_sha1);
 124         if (!commit || parse_commit(commit))
 125                 cgit_print_error(fmt("Bad commit: %s", sha1_to_hex(new_rev_sha1)));
 126
 127         if (old_rev)
 128                 get_sha1(old_rev, old_rev_sha1);
 129         else if (commit->parents && commit->parents->item)
 130                 hashcpy(old_rev_sha1, commit->parents->item->object.sha1);
 131         else
 132                 hashclr(old_rev_sha1);
 133
 134         if (!is_null_sha1(old_rev_sha1)) {
 135                 type = sha1_object_info(old_rev_sha1, &size);
 136                 if (type == OBJ_BAD) {
 137                         cgit_print_error(fmt("Bad object name: %s", sha1_to_hex(old_rev_sha1)));
 138                         return;
 139                 }
 140                 commit2 = lookup_commit_reference(old_rev_sha1);
 141                 if (!commit2 || parse_commit(commit2))
 142                         cgit_print_error(fmt("Bad commit: %s", sha1_to_hex(old_rev_sha1)));
 143         }
 144         html("<table class='diff'>");
 145         html("<tr><td>");
 146         cgit_diff_tree(old_rev_sha1, new_rev_sha1, filepair_cb, prefix);
 147         html("</td></tr>");
 148         html("</table>");
 149 }