diff-files.c

   1 /*
   2  * GIT - The information manager from hell
   3  *
   4  * Copyright (C) Linus Torvalds, 2005
   5  */
   6 #include "cache.h"
   7 #include "diff.h"
   8
   9 static const char *diff_files_usage =
  10 "git-diff-files [-p] [-q] [-r] [-z] [-M] [paths...]";
  11
  12 static int generate_patch = 0;
  13 static int line_termination = '\n';
  14 static int detect_rename = 0;
  15 static int silent = 0;
  16
  17 static int matches_pathspec(struct cache_entry *ce, char **spec, int cnt)
  18 {
  19         int i;
  20         int namelen = ce_namelen(ce);
  21         for (i = 0; i < cnt; i++) {
  22                 int speclen = strlen(spec[i]);
  23                 if (! strncmp(spec[i], ce->name, speclen) &&
  24                     speclen <= namelen &&
  25                     (ce->name[speclen] == 0 ||
  26                      ce->name[speclen] == '/'))
  27                         return 1;
  28         }
  29         return 0;
  30 }
  31
  32 static void show_unmerge(const char *path)
  33 {
  34         if (generate_patch)
  35                 diff_unmerge(path);
  36         else
  37                 printf("U %s%c", path, line_termination);
  38 }
  39
  40 static void show_file(int pfx, struct cache_entry *ce)
  41 {
  42         if (generate_patch)
  43                 diff_addremove(pfx, ntohl(ce->ce_mode), ce->sha1,
  44                                ce->name, NULL);
  45         else
  46                 printf("%c%06o\t%s\t%s\t%s%c",
  47                        pfx, ntohl(ce->ce_mode), "blob",
  48                        sha1_to_hex(ce->sha1), ce->name, line_termination);
  49 }
  50
  51 static void show_modified(int oldmode, int mode,
  52                           const unsigned char *old_sha1, const unsigned char *sha1,
  53                           char *path)
  54 {
  55         char old_sha1_hex[41];
  56         strcpy(old_sha1_hex, sha1_to_hex(old_sha1));
  57
  58         if (generate_patch)
  59                 diff_change(oldmode, mode, old_sha1, sha1, path, NULL);
  60         else
  61                 printf("*%06o->%06o\tblob\t%s->%s\t%s%c",
  62                        oldmode, mode, old_sha1_hex, sha1_to_hex(sha1), path,
  63                        line_termination);
  64 }
  65
  66 int main(int argc, char **argv)
  67 {
  68         static const unsigned char null_sha1[20] = { 0, };
  69         int entries = read_cache();
  70         int i;
  71
  72         while (1 < argc && argv[1][0] == '-') {
  73                 if (!strcmp(argv[1], "-p"))
  74                         generate_patch = 1;
  75                 else if (!strcmp(argv[1], "-q"))
  76                         silent = 1;
  77                 else if (!strcmp(argv[1], "-r"))
  78                         ; /* no-op */
  79                 else if (!strcmp(argv[1], "-s"))
  80                         ; /* no-op */
  81                 else if (!strcmp(argv[1], "-z"))
  82                         line_termination = 0;
  83                 else if (!strcmp(argv[1], "-M")) {
  84                         detect_rename = generate_patch = 1;
  85                 }
  86                 else
  87                         usage(diff_files_usage);
  88                 argv++; argc--;
  89         }
  90
  91         /* At this point, if argc == 1, then we are doing everything.
  92          * Otherwise argv[1] .. argv[argc-1] have the explicit paths.
  93          */
  94         if (entries < 0) {
  95                 perror("read_cache");
  96                 exit(1);
  97         }
  98
  99         if (generate_patch)
 100                 diff_setup(detect_rename, 0, 0, 0, 0);
 101
 102         for (i = 0; i < entries; i++) {
 103                 struct stat st;
 104                 unsigned int oldmode, mode;
 105                 struct cache_entry *ce = active_cache[i];
 106                 int changed;
 107
 108                 if (1 < argc &&
 109                     ! matches_pathspec(ce, argv+1, argc-1))
 110                         continue;
 111
 112                 if (ce_stage(ce)) {
 113                         show_unmerge(ce->name);
 114                         while (i < entries &&
 115                                !strcmp(ce->name, active_cache[i]->name))
 116                                 i++;
 117                         i--; /* compensate for loop control increments */
 118                         continue;
 119                 }
 120
 121                 if (lstat(ce->name, &st) < 0) {
 122                         if (errno != ENOENT) {
 123                                 perror(ce->name);
 124                                 continue;
 125                         }
 126                         if (silent)
 127                                 continue;
 128                         show_file('-', ce);
 129                         continue;
 130                 }
 131                 changed = ce_match_stat(ce, &st);
 132                 if (!changed)
 133                         continue;
 134
 135                 oldmode = ntohl(ce->ce_mode);
 136                 mode = (S_ISLNK(st.st_mode) ? S_IFLNK :
 137                         S_IFREG | ce_permissions(st.st_mode));
 138
 139                 show_modified(oldmode, mode, ce->sha1, null_sha1,
 140                               ce->name);
 141         }
 142         if (generate_patch)
 143                 diff_flush();
 144         return 0;
 145 }