Andrew's git - gitweb.git/blob

   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#include "dir.h"
  19
  20static int read_directory_contents(const char *path, struct string_list *list)
  21{
  22        DIR *dir;
  23        struct dirent *e;
  24
  25        if (!(dir = opendir(path)))
  26                return error("Could not open directory %s", path);
  27
  28        while ((e = readdir(dir)))
  29                if (!is_dot_or_dotdot(e->d_name))
  30                        string_list_insert(list, e->d_name);
  31
  32        closedir(dir);
  33        return 0;
  34}
  35
  36/*
  37 * This should be "(standard input)" or something, but it will
  38 * probably expose many more breakages in the way no-index code
  39 * is bolted onto the diff callchain.
  40 */
  41static const char file_from_standard_input[] = "-";
  42
  43static int get_mode(const char *path, int *mode)
  44{
  45        struct stat st;
  46
  47        if (!path || !strcmp(path, "/dev/null"))
  48                *mode = 0;
  49#ifdef GIT_WINDOWS_NATIVE
  50        else if (!strcasecmp(path, "nul"))
  51                *mode = 0;
  52#endif
  53        else if (path == file_from_standard_input)
  54                *mode = create_ce_mode(0666);
  55        else if (lstat(path, &st))
  56                return error("Could not access '%s'", path);
  57        else
  58                *mode = st.st_mode;
  59        return 0;
  60}
  61
  62static int populate_from_stdin(struct diff_filespec *s)
  63{
  64        struct strbuf buf = STRBUF_INIT;
  65        size_t size = 0;
  66
  67        if (strbuf_read(&buf, 0, 0) < 0)
  68                return error_errno("error while reading from stdin");
  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
  78static 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, 0, mode);
  86        if (name == file_from_standard_input)
  87                populate_from_stdin(s);
  88        return s;
  89}
  90
  91static 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                struct diff_filespec *d1, *d2;
 101
 102                if (S_ISDIR(mode1)) {
 103                        /* 2 is file that is created */
 104                        d1 = noindex_filespec(NULL, 0);
 105                        d2 = noindex_filespec(name2, mode2);
 106                        name2 = NULL;
 107                        mode2 = 0;
 108                } else {
 109                        /* 1 is file that is deleted */
 110                        d1 = noindex_filespec(name1, mode1);
 111                        d2 = noindex_filespec(NULL, 0);
 112                        name1 = NULL;
 113                        mode1 = 0;
 114                }
 115                /* emit that file */
 116                diff_queue(&diff_queued_diff, d1, d2);
 117
 118                /* and then let the entire directory be created or deleted */
 119        }
 120
 121        if (S_ISDIR(mode1) || S_ISDIR(mode2)) {
 122                struct strbuf buffer1 = STRBUF_INIT;
 123                struct strbuf buffer2 = STRBUF_INIT;
 124                struct string_list p1 = STRING_LIST_INIT_DUP;
 125                struct string_list p2 = STRING_LIST_INIT_DUP;
 126                int i1, i2, ret = 0;
 127                size_t len1 = 0, len2 = 0;
 128
 129                if (name1 && read_directory_contents(name1, &p1))
 130                        return -1;
 131                if (name2 && read_directory_contents(name2, &p2)) {
 132                        string_list_clear(&p1, 0);
 133                        return -1;
 134                }
 135
 136                if (name1) {
 137                        strbuf_addstr(&buffer1, name1);
 138                        strbuf_complete(&buffer1, '/');
 139                        len1 = buffer1.len;
 140                }
 141
 142                if (name2) {
 143                        strbuf_addstr(&buffer2, name2);
 144                        strbuf_complete(&buffer2, '/');
 145                        len2 = buffer2.len;
 146                }
 147
 148                for (i1 = i2 = 0; !ret && (i1 < p1.nr || i2 < p2.nr); ) {
 149                        const char *n1, *n2;
 150                        int comp;
 151
 152                        strbuf_setlen(&buffer1, len1);
 153                        strbuf_setlen(&buffer2, len2);
 154
 155                        if (i1 == p1.nr)
 156                                comp = 1;
 157                        else if (i2 == p2.nr)
 158                                comp = -1;
 159                        else
 160                                comp = strcmp(p1.items[i1].string, p2.items[i2].string);
 161
 162                        if (comp > 0)
 163                                n1 = NULL;
 164                        else {
 165                                strbuf_addstr(&buffer1, p1.items[i1++].string);
 166                                n1 = buffer1.buf;
 167                        }
 168
 169                        if (comp < 0)
 170                                n2 = NULL;
 171                        else {
 172                                strbuf_addstr(&buffer2, p2.items[i2++].string);
 173                                n2 = buffer2.buf;
 174                        }
 175
 176                        ret = queue_diff(o, n1, n2);
 177                }
 178                string_list_clear(&p1, 0);
 179                string_list_clear(&p2, 0);
 180                strbuf_release(&buffer1);
 181                strbuf_release(&buffer2);
 182
 183                return ret;
 184        } else {
 185                struct diff_filespec *d1, *d2;
 186
 187                if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
 188                        unsigned tmp;
 189                        const char *tmp_c;
 190                        tmp = mode1; mode1 = mode2; mode2 = tmp;
 191                        tmp_c = name1; name1 = name2; name2 = tmp_c;
 192                }
 193
 194                d1 = noindex_filespec(name1, mode1);
 195                d2 = noindex_filespec(name2, mode2);
 196                diff_queue(&diff_queued_diff, d1, d2);
 197                return 0;
 198        }
 199}
 200
 201/* append basename of F to D */
 202static void append_basename(struct strbuf *path, const char *dir, const char *file)
 203{
 204        const char *tail = strrchr(file, '/');
 205
 206        strbuf_addstr(path, dir);
 207        while (path->len && path->buf[path->len - 1] == '/')
 208                path->len--;
 209        strbuf_addch(path, '/');
 210        strbuf_addstr(path, tail ? tail + 1 : file);
 211}
 212
 213/*
 214 * DWIM "diff D F" into "diff D/F F" and "diff F D" into "diff F D/F"
 215 * Note that we append the basename of F to D/, so "diff a/b/file D"
 216 * becomes "diff a/b/file D/file", not "diff a/b/file D/a/b/file".
 217 */
 218static void fixup_paths(const char **path, struct strbuf *replacement)
 219{
 220        unsigned int isdir0, isdir1;
 221
 222        if (path[0] == file_from_standard_input ||
 223            path[1] == file_from_standard_input)
 224                return;
 225        isdir0 = is_directory(path[0]);
 226        isdir1 = is_directory(path[1]);
 227        if (isdir0 == isdir1)
 228                return;
 229        if (isdir0) {
 230                append_basename(replacement, path[0], path[1]);
 231                path[0] = replacement->buf;
 232        } else {
 233                append_basename(replacement, path[1], path[0]);
 234                path[1] = replacement->buf;
 235        }
 236}
 237
 238void diff_no_index(struct rev_info *revs,
 239                   int argc, const char **argv)
 240{
 241        int i, prefixlen;
 242        const char *paths[2];
 243        struct strbuf replacement = STRBUF_INIT;
 244        const char *prefix = revs->prefix;
 245
 246        diff_setup(&revs->diffopt);
 247        for (i = 1; i < argc - 2; ) {
 248                int j;
 249                if (!strcmp(argv[i], "--no-index"))
 250                        i++;
 251                else if (!strcmp(argv[i], "--"))
 252                        i++;
 253                else {
 254                        j = diff_opt_parse(&revs->diffopt, argv + i, argc - i,
 255                                           revs->prefix);
 256                        if (j <= 0)
 257                                die("invalid diff option/value: %s", argv[i]);
 258                        i += j;
 259                }
 260        }
 261
 262        prefixlen = prefix ? strlen(prefix) : 0;
 263        for (i = 0; i < 2; i++) {
 264                const char *p = argv[argc - 2 + i];
 265                if (!strcmp(p, "-"))
 266                        /*
 267                         * stdin should be spelled as "-"; if you have
 268                         * path that is "-", spell it as "./-".
 269                         */
 270                        p = file_from_standard_input;
 271                else if (prefixlen)
 272                        p = xstrdup(prefix_filename(prefix, prefixlen, p));
 273                paths[i] = p;
 274        }
 275
 276        fixup_paths(paths, &replacement);
 277
 278        revs->diffopt.skip_stat_unmatch = 1;
 279        if (!revs->diffopt.output_format)
 280                revs->diffopt.output_format = DIFF_FORMAT_PATCH;
 281
 282        DIFF_OPT_SET(&revs->diffopt, NO_INDEX);
 283
 284        DIFF_OPT_SET(&revs->diffopt, RELATIVE_NAME);
 285        revs->diffopt.prefix = prefix;
 286
 287        revs->max_count = -2;
 288        diff_setup_done(&revs->diffopt);
 289
 290        setup_diff_pager(&revs->diffopt);
 291        DIFF_OPT_SET(&revs->diffopt, EXIT_WITH_STATUS);
 292
 293        if (queue_diff(&revs->diffopt, paths[0], paths[1]))
 294                exit(1);
 295        diff_set_mnemonic_prefix(&revs->diffopt, "1/", "2/");
 296        diffcore_std(&revs->diffopt);
 297        diff_flush(&revs->diffopt);
 298
 299        strbuf_release(&replacement);
 300
 301        /*
 302         * The return code for --no-index imitates diff(1):
 303         * 0 = no changes, 1 = changes, else error
 304         */
 305        exit(diff_result_code(&revs->diffopt, 0));
 306}