diff-no-index.c

   1 /*
   2  * "diff --no-index" support
   3  * Copyright (c) 2007 by Johannes Schindelin
   4  * Copyright (c) 2008 by Junio C Hamano
   5  */
   6
   7 #include "cache.h"
   8 #include "color.h"
   9 #include "commit.h"
  10 #include "blob.h"
  11 #include "tag.h"
  12 #include "diff.h"
  13 #include "diffcore.h"
  14 #include "revision.h"
  15 #include "log-tree.h"
  16 #include "builtin.h"
  17 #include "string-list.h"
  18
  19 static int read_directory(const char *path, struct string_list *list)
  20 {
  21         DIR *dir;
  22         struct dirent *e;
  23
  24         if (!(dir = opendir(path)))
  25                 return error("Could not open directory %s", path);
  26
  27         while ((e = readdir(dir)))
  28                 if (strcmp(".", e->d_name) && strcmp("..", e->d_name))
  29                         string_list_insert(list, e->d_name);
  30
  31         closedir(dir);
  32         return 0;
  33 }
  34
  35 /*
  36  * This should be "(standard input)" or something, but it will
  37  * probably expose many more breakages in the way no-index code
  38  * is bolted onto the diff callchain.
  39  */
  40 static const char file_from_standard_input[] = "-";
  41
  42 static int get_mode(const char *path, int *mode)
  43 {
  44         struct stat st;
  45
  46         if (!path || !strcmp(path, "/dev/null"))
  47                 *mode = 0;
  48 #ifdef _WIN32
  49         else if (!strcasecmp(path, "nul"))
  50                 *mode = 0;
  51 #endif
  52         else if (path == file_from_standard_input)
  53                 *mode = create_ce_mode(0666);
  54         else if (lstat(path, &st))
  55                 return error("Could not access '%s'", path);
  56         else
  57                 *mode = st.st_mode;
  58         return 0;
  59 }
  60
  61 static int populate_from_stdin(struct diff_filespec *s)
  62 {
  63         struct strbuf buf = STRBUF_INIT;
  64         size_t size = 0;
  65
  66         if (strbuf_read(&buf, 0, 0) < 0)
  67                 return error("error while reading from stdin %s",
  68                                      strerror(errno));
  69
  70         s->should_munmap = 0;
  71         s->data = strbuf_detach(&buf, &size);
  72         s->size = size;
  73         s->should_free = 1;
  74         s->is_stdin = 1;
  75         return 0;
  76 }
  77
  78 static struct diff_filespec *noindex_filespec(const char *name, int mode)
  79 {
  80         struct diff_filespec *s;
  81
  82         if (!name)
  83                 name = "/dev/null";
  84         s = alloc_filespec(name);
  85         fill_filespec(s, null_sha1, mode);
  86         if (name == file_from_standard_input)
  87                 populate_from_stdin(s);
  88         return s;
  89 }
  90
  91 static int queue_diff(struct diff_options *o,
  92                       const char *name1, const char *name2)
  93 {
  94         int mode1 = 0, mode2 = 0;
  95
  96         if (get_mode(name1, &mode1) || get_mode(name2, &mode2))
  97                 return -1;
  98
  99         if (mode1 && mode2 && S_ISDIR(mode1) != S_ISDIR(mode2))
 100                 return error("file/directory conflict: %s, %s", name1, name2);
 101
 102         if (S_ISDIR(mode1) || S_ISDIR(mode2)) {
 103                 struct strbuf buffer1 = STRBUF_INIT;
 104                 struct strbuf buffer2 = STRBUF_INIT;
 105                 struct string_list p1 = STRING_LIST_INIT_DUP;
 106                 struct string_list p2 = STRING_LIST_INIT_DUP;
 107                 int i1, i2, ret = 0;
 108                 size_t len1 = 0, len2 = 0;
 109
 110                 if (name1 && read_directory(name1, &p1))
 111                         return -1;
 112                 if (name2 && read_directory(name2, &p2)) {
 113                         string_list_clear(&p1, 0);
 114                         return -1;
 115                 }
 116
 117                 if (name1) {
 118                         strbuf_addstr(&buffer1, name1);
 119                         if (buffer1.len && buffer1.buf[buffer1.len - 1] != '/')
 120                                 strbuf_addch(&buffer1, '/');
 121                         len1 = buffer1.len;
 122                 }
 123
 124                 if (name2) {
 125                         strbuf_addstr(&buffer2, name2);
 126                         if (buffer2.len && buffer2.buf[buffer2.len - 1] != '/')
 127                                 strbuf_addch(&buffer2, '/');
 128                         len2 = buffer2.len;
 129                 }
 130
 131                 for (i1 = i2 = 0; !ret && (i1 < p1.nr || i2 < p2.nr); ) {
 132                         const char *n1, *n2;
 133                         int comp;
 134
 135                         strbuf_setlen(&buffer1, len1);
 136                         strbuf_setlen(&buffer2, len2);
 137
 138                         if (i1 == p1.nr)
 139                                 comp = 1;
 140                         else if (i2 == p2.nr)
 141                                 comp = -1;
 142                         else
 143                                 comp = strcmp(p1.items[i1].string, p2.items[i2].string);
 144
 145                         if (comp > 0)
 146                                 n1 = NULL;
 147                         else {
 148                                 strbuf_addstr(&buffer1, p1.items[i1++].string);
 149                                 n1 = buffer1.buf;
 150                         }
 151
 152                         if (comp < 0)
 153                                 n2 = NULL;
 154                         else {
 155                                 strbuf_addstr(&buffer2, p2.items[i2++].string);
 156                                 n2 = buffer2.buf;
 157                         }
 158
 159                         ret = queue_diff(o, n1, n2);
 160                 }
 161                 string_list_clear(&p1, 0);
 162                 string_list_clear(&p2, 0);
 163                 strbuf_release(&buffer1);
 164                 strbuf_release(&buffer2);
 165
 166                 return ret;
 167         } else {
 168                 struct diff_filespec *d1, *d2;
 169
 170                 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
 171                         unsigned tmp;
 172                         const char *tmp_c;
 173                         tmp = mode1; mode1 = mode2; mode2 = tmp;
 174                         tmp_c = name1; name1 = name2; name2 = tmp_c;
 175                 }
 176
 177                 d1 = noindex_filespec(name1, mode1);
 178                 d2 = noindex_filespec(name2, mode2);
 179                 diff_queue(&diff_queued_diff, d1, d2);
 180                 return 0;
 181         }
 182 }
 183
 184 void diff_no_index(struct rev_info *revs,
 185                    int argc, const char **argv,
 186                    int nongit, const char *prefix)
 187 {
 188         int i, prefixlen;
 189         int no_index = 0;
 190         unsigned options = 0;
 191         const char *paths[2];
 192
 193         /* Were we asked to do --no-index explicitly? */
 194         for (i = 1; i < argc; i++) {
 195                 if (!strcmp(argv[i], "--")) {
 196                         i++;
 197                         break;
 198                 }
 199                 if (!strcmp(argv[i], "--no-index"))
 200                         no_index = 1;
 201                 if (argv[i][0] != '-')
 202                         break;
 203         }
 204
 205         if (!no_index && !nongit) {
 206                 /*
 207                  * Inside a git repository, without --no-index.  Only
 208                  * when a path outside the repository is given,
 209                  * e.g. "git diff /var/tmp/[12]", or "git diff
 210                  * Makefile /var/tmp/Makefile", allow it to be used as
 211                  * a colourful "diff" replacement.
 212                  */
 213                 if ((argc != i + 2) ||
 214                     (path_inside_repo(prefix, argv[i]) &&
 215                      path_inside_repo(prefix, argv[i+1])))
 216                         return;
 217         }
 218         if (argc != i + 2)
 219                 usagef("git diff %s <path> <path>",
 220                        no_index ? "--no-index" : "[--no-index]");
 221
 222         diff_setup(&revs->diffopt);
 223         for (i = 1; i < argc - 2; ) {
 224                 int j;
 225                 if (!strcmp(argv[i], "--no-index"))
 226                         i++;
 227                 else if (!strcmp(argv[i], "-q")) {
 228                         options |= DIFF_SILENT_ON_REMOVED;
 229                         i++;
 230                 }
 231                 else if (!strcmp(argv[i], "--"))
 232                         i++;
 233                 else {
 234                         j = diff_opt_parse(&revs->diffopt, argv + i, argc - i);
 235                         if (!j)
 236                                 die("invalid diff option/value: %s", argv[i]);
 237                         i += j;
 238                 }
 239         }
 240
 241         prefixlen = prefix ? strlen(prefix) : 0;
 242         for (i = 0; i < 2; i++) {
 243                 const char *p = argv[argc - 2 + i];
 244                 if (!strcmp(p, "-"))
 245                         /*
 246                          * stdin should be spelled as "-"; if you have
 247                          * path that is "-", spell it as "./-".
 248                          */
 249                         p = file_from_standard_input;
 250                 else if (prefixlen)
 251                         p = xstrdup(prefix_filename(prefix, prefixlen, p));
 252                 paths[i] = p;
 253         }
 254         revs->diffopt.skip_stat_unmatch = 1;
 255         if (!revs->diffopt.output_format)
 256                 revs->diffopt.output_format = DIFF_FORMAT_PATCH;
 257
 258         DIFF_OPT_SET(&revs->diffopt, NO_INDEX);
 259
 260         revs->max_count = -2;
 261         diff_setup_done(&revs->diffopt);
 262
 263         setup_diff_pager(&revs->diffopt);
 264         DIFF_OPT_SET(&revs->diffopt, EXIT_WITH_STATUS);
 265
 266         if (queue_diff(&revs->diffopt, paths[0], paths[1]))
 267                 exit(1);
 268         diff_set_mnemonic_prefix(&revs->diffopt, "1/", "2/");
 269         diffcore_std(&revs->diffopt);
 270         diff_flush(&revs->diffopt);
 271
 272         /*
 273          * The return code for --no-index imitates diff(1):
 274          * 0 = no changes, 1 = changes, else error
 275          */
 276         exit(diff_result_code(&revs->diffopt, 0));
 277 }