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 #include "html.h"
  11 #include "ui-shared.h"
  12
  13 unsigned char old_rev_sha1[20];
  14 unsigned char new_rev_sha1[20];
  15
  16 /*
  17  * print a single line returned from xdiff
  18  */
  19 static void print_line(char *line, int len)
  20 {
  21         char *class = "ctx";
  22         char c = line[len-1];
  23
  24         if (line[0] == '+')
  25                 class = "add";
  26         else if (line[0] == '-')
  27                 class = "del";
  28         else if (line[0] == '@')
  29                 class = "hunk";
  30
  31         htmlf("<div class='%s'>", class);
  32         line[len-1] = '\0';
  33         html_txt(line);
  34         html("</div>");
  35         line[len-1] = c;
  36 }
  37
  38 static void header(unsigned char *sha1, char *path1, int mode1,
  39                    unsigned char *sha2, char *path2, int mode2)
  40 {
  41         char *abbrev1, *abbrev2;
  42         int subproject;
  43
  44         subproject = (S_ISGITLINK(mode1) || S_ISGITLINK(mode2));
  45         html("<div class='head'>");
  46         html("diff --git a/");
  47         html_txt(path1);
  48         html(" b/");
  49         html_txt(path2);
  50
  51         if (is_null_sha1(sha1))
  52                 path1 = "dev/null";
  53         if (is_null_sha1(sha2))
  54                 path2 = "dev/null";
  55
  56         if (mode1 == 0)
  57                 htmlf("<br/>new file mode %.6o", mode2);
  58
  59         if (mode2 == 0)
  60                 htmlf("<br/>deleted file mode %.6o", mode1);
  61
  62         if (!subproject) {
  63                 abbrev1 = xstrdup(find_unique_abbrev(sha1, DEFAULT_ABBREV));
  64                 abbrev2 = xstrdup(find_unique_abbrev(sha2, DEFAULT_ABBREV));
  65                 htmlf("<br/>index %s..%s", abbrev1, abbrev2);
  66                 free(abbrev1);
  67                 free(abbrev2);
  68                 if (mode1 != 0 && mode2 != 0) {
  69                         htmlf(" %.6o", mode1);
  70                         if (mode2 != mode1)
  71                                 htmlf("..%.6o", mode2);
  72                 }
  73                 html("<br/>--- a/");
  74                 if (mode1 != 0)
  75                         cgit_tree_link(path1, NULL, NULL, ctx.qry.head,
  76                                        sha1_to_hex(old_rev_sha1), path1);
  77                 else
  78                         html_txt(path1);
  79                 html("<br/>+++ b/");
  80                 if (mode2 != 0)
  81                         cgit_tree_link(path2, NULL, NULL, ctx.qry.head,
  82                                        sha1_to_hex(new_rev_sha1), path2);
  83                 else
  84                         html_txt(path2);
  85         }
  86         html("</div>");
  87 }
  88
  89 static void filepair_cb(struct diff_filepair *pair)
  90 {
  91         header(pair->one->sha1, pair->one->path, pair->one->mode,
  92                pair->two->sha1, pair->two->path, pair->two->mode);
  93         if (S_ISGITLINK(pair->one->mode) || S_ISGITLINK(pair->two->mode)) {
  94                 if (S_ISGITLINK(pair->one->mode))
  95                         print_line(fmt("-Subproject %s", sha1_to_hex(pair->one->sha1)), 52);
  96                 if (S_ISGITLINK(pair->two->mode))
  97                         print_line(fmt("+Subproject %s", sha1_to_hex(pair->two->sha1)), 52);
  98                 return;
  99         }
 100         if (cgit_diff_files(pair->one->sha1, pair->two->sha1, print_line))
 101                 cgit_print_error("Error running diff");
 102 }
 103
 104 void cgit_print_diff(const char *new_rev, const char *old_rev, const char *prefix)
 105 {
 106         enum object_type type;
 107         unsigned long size;
 108         struct commit *commit, *commit2;
 109
 110         if (!new_rev)
 111                 new_rev = ctx.qry.head;
 112         get_sha1(new_rev, new_rev_sha1);
 113         type = sha1_object_info(new_rev_sha1, &size);
 114         if (type == OBJ_BAD) {
 115                 cgit_print_error(fmt("Bad object name: %s", new_rev));
 116                 return;
 117         }
 118         if (type != OBJ_COMMIT) {
 119                 cgit_print_error(fmt("Unhandled object type: %s",
 120                                      typename(type)));
 121                 return;
 122         }
 123
 124         commit = lookup_commit_reference(new_rev_sha1);
 125         if (!commit || parse_commit(commit))
 126                 cgit_print_error(fmt("Bad commit: %s", sha1_to_hex(new_rev_sha1)));
 127
 128         if (old_rev)
 129                 get_sha1(old_rev, old_rev_sha1);
 130         else if (commit->parents && commit->parents->item)
 131                 hashcpy(old_rev_sha1, commit->parents->item->object.sha1);
 132         else
 133                 hashclr(old_rev_sha1);
 134
 135         if (!is_null_sha1(old_rev_sha1)) {
 136                 type = sha1_object_info(old_rev_sha1, &size);
 137                 if (type == OBJ_BAD) {
 138                         cgit_print_error(fmt("Bad object name: %s", sha1_to_hex(old_rev_sha1)));
 139                         return;
 140                 }
 141                 commit2 = lookup_commit_reference(old_rev_sha1);
 142                 if (!commit2 || parse_commit(commit2))
 143                         cgit_print_error(fmt("Bad commit: %s", sha1_to_hex(old_rev_sha1)));
 144         }
 145         html("<table summary='diff' class='diff'>");
 146         html("<tr><td>");
 147         cgit_diff_tree(old_rev_sha1, new_rev_sha1, filepair_cb, prefix);
 148         html("</td></tr>");
 149         html("</table>");
 150 }