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 "path-list.h"
  18
  19 static int read_directory(const char *path, struct path_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                         path_list_insert(e->d_name, list);
  30
  31         closedir(dir);
  32         return 0;
  33 }
  34
  35 static int get_mode(const char *path, int *mode)
  36 {
  37         struct stat st;
  38
  39         if (!path || !strcmp(path, "/dev/null"))
  40                 *mode = 0;
  41         else if (!strcmp(path, "-"))
  42                 *mode = create_ce_mode(0666);
  43         else if (stat(path, &st))
  44                 return error("Could not access '%s'", path);
  45         else
  46                 *mode = st.st_mode;
  47         return 0;
  48 }
  49
  50 static int queue_diff(struct diff_options *o,
  51                 const char *name1, const char *name2)
  52 {
  53         int mode1 = 0, mode2 = 0;
  54
  55         if (get_mode(name1, &mode1) || get_mode(name2, &mode2))
  56                 return -1;
  57
  58         if (mode1 && mode2 && S_ISDIR(mode1) != S_ISDIR(mode2))
  59                 return error("file/directory conflict: %s, %s", name1, name2);
  60
  61         if (S_ISDIR(mode1) || S_ISDIR(mode2)) {
  62                 char buffer1[PATH_MAX], buffer2[PATH_MAX];
  63                 struct path_list p1 = {NULL, 0, 0, 1}, p2 = {NULL, 0, 0, 1};
  64                 int len1 = 0, len2 = 0, i1, i2, ret = 0;
  65
  66                 if (name1 && read_directory(name1, &p1))
  67                         return -1;
  68                 if (name2 && read_directory(name2, &p2)) {
  69                         path_list_clear(&p1, 0);
  70                         return -1;
  71                 }
  72
  73                 if (name1) {
  74                         len1 = strlen(name1);
  75                         if (len1 > 0 && name1[len1 - 1] == '/')
  76                                 len1--;
  77                         memcpy(buffer1, name1, len1);
  78                         buffer1[len1++] = '/';
  79                 }
  80
  81                 if (name2) {
  82                         len2 = strlen(name2);
  83                         if (len2 > 0 && name2[len2 - 1] == '/')
  84                                 len2--;
  85                         memcpy(buffer2, name2, len2);
  86                         buffer2[len2++] = '/';
  87                 }
  88
  89                 for (i1 = i2 = 0; !ret && (i1 < p1.nr || i2 < p2.nr); ) {
  90                         const char *n1, *n2;
  91                         int comp;
  92
  93                         if (i1 == p1.nr)
  94                                 comp = 1;
  95                         else if (i2 == p2.nr)
  96                                 comp = -1;
  97                         else
  98                                 comp = strcmp(p1.items[i1].path,
  99                                         p2.items[i2].path);
 100
 101                         if (comp > 0)
 102                                 n1 = NULL;
 103                         else {
 104                                 n1 = buffer1;
 105                                 strncpy(buffer1 + len1, p1.items[i1++].path,
 106                                                 PATH_MAX - len1);
 107                         }
 108
 109                         if (comp < 0)
 110                                 n2 = NULL;
 111                         else {
 112                                 n2 = buffer2;
 113                                 strncpy(buffer2 + len2, p2.items[i2++].path,
 114                                                 PATH_MAX - len2);
 115                         }
 116
 117                         ret = queue_diff(o, n1, n2);
 118                 }
 119                 path_list_clear(&p1, 0);
 120                 path_list_clear(&p2, 0);
 121
 122                 return ret;
 123         } else {
 124                 struct diff_filespec *d1, *d2;
 125
 126                 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
 127                         unsigned tmp;
 128                         const char *tmp_c;
 129                         tmp = mode1; mode1 = mode2; mode2 = tmp;
 130                         tmp_c = name1; name1 = name2; name2 = tmp_c;
 131                 }
 132
 133                 if (!name1)
 134                         name1 = "/dev/null";
 135                 if (!name2)
 136                         name2 = "/dev/null";
 137                 d1 = alloc_filespec(name1);
 138                 d2 = alloc_filespec(name2);
 139                 fill_filespec(d1, null_sha1, mode1);
 140                 fill_filespec(d2, null_sha1, mode2);
 141
 142                 diff_queue(&diff_queued_diff, d1, d2);
 143                 return 0;
 144         }
 145 }
 146
 147 void diff_no_index(struct rev_info *revs,
 148                    int argc, const char **argv,
 149                    int nongit, const char *prefix)
 150 {
 151         int i;
 152         int no_index = 0;
 153         unsigned options = 0;
 154
 155         /* Were we asked to do --no-index explicitly? */
 156         for (i = 1; i < argc; i++) {
 157                 if (!strcmp(argv[i], "--"))
 158                         return;
 159                 if (!strcmp(argv[i], "--no-index"))
 160                         no_index = 1;
 161                 if (argv[i][0] != '-')
 162                         break;
 163         }
 164
 165         /*
 166          * No explicit --no-index, but "git diff --opts A B" outside
 167          * a git repository is a cute hack to support.
 168          */
 169         if (!no_index && !nongit)
 170                 return;
 171
 172         if (argc != i + 2)
 173                 die("git diff %s takes two paths",
 174                     no_index ? "--no-index" : "[--no-index]");
 175
 176         diff_setup(&revs->diffopt);
 177         if (!revs->diffopt.output_format)
 178                 revs->diffopt.output_format = DIFF_FORMAT_PATCH;
 179         for (i = 1; i < argc - 2; ) {
 180                 int j;
 181                 if (!strcmp(argv[i], "--no-index"))
 182                         i++;
 183                 else if (!strcmp(argv[1], "-q"))
 184                         options |= DIFF_SILENT_ON_REMOVED;
 185                 else {
 186                         j = diff_opt_parse(&revs->diffopt, argv + i, argc - i);
 187                         if (!j)
 188                                 die("invalid diff option/value: %s", argv[i]);
 189                         i += j;
 190                 }
 191         }
 192
 193         if (prefix) {
 194                 int len = strlen(prefix);
 195
 196                 revs->diffopt.paths = xcalloc(2, sizeof(char*));
 197                 for (i = 0; i < 2; i++) {
 198                         const char *p = argv[argc - 2 + i];
 199                         /*
 200                          * stdin should be spelled as '-'; if you have
 201                          * path that is '-', spell it as ./-.
 202                          */
 203                         p = (strcmp(p, "-")
 204                              ? xstrdup(prefix_filename(prefix, len, p))
 205                              : p);
 206                         revs->diffopt.paths[i] = p;
 207                 }
 208         }
 209         else
 210                 revs->diffopt.paths = argv + argc - 2;
 211         revs->diffopt.nr_paths = 2;
 212
 213         DIFF_OPT_SET(&revs->diffopt, EXIT_WITH_STATUS);
 214         DIFF_OPT_SET(&revs->diffopt, NO_INDEX);
 215
 216         revs->max_count = -2;
 217         if (diff_setup_done(&revs->diffopt) < 0)
 218                 die("diff_setup_done failed");
 219
 220         if (queue_diff(&revs->diffopt, revs->diffopt.paths[0],
 221                        revs->diffopt.paths[1]))
 222                 exit(1);
 223         diffcore_std(&revs->diffopt);
 224         diff_flush(&revs->diffopt);
 225
 226         /*
 227          * The return code for --no-index imitates diff(1):
 228          * 0 = no changes, 1 = changes, else error
 229          */
 230         exit(revs->diffopt.found_changes);
 231 }