git-add --intent-to-add (-N)
[gitweb.git] / diff-lib.c
index 069e4507ae7caa70f79d5369bc61dfefd0f174e2..e7eaff9a68ccbcc692522c9956f0dae9af45f3f1 100644 (file)
@@ -8,7 +8,6 @@
 #include "diffcore.h"
 #include "revision.h"
 #include "cache-tree.h"
-#include "path-list.h"
 #include "unpack-trees.h"
 #include "refs.h"
 
  * diff-files
  */
 
-static int read_directory(const char *path, struct path_list *list)
-{
-       DIR *dir;
-       struct dirent *e;
-
-       if (!(dir = opendir(path)))
-               return error("Could not open directory %s", path);
-
-       while ((e = readdir(dir)))
-               if (strcmp(".", e->d_name) && strcmp("..", e->d_name))
-                       path_list_insert(e->d_name, list);
-
-       closedir(dir);
-       return 0;
-}
-
-static int get_mode(const char *path, int *mode)
-{
-       struct stat st;
-
-       if (!path || !strcmp(path, "/dev/null"))
-               *mode = 0;
-       else if (!strcmp(path, "-"))
-               *mode = create_ce_mode(0666);
-       else if (stat(path, &st))
-               return error("Could not access '%s'", path);
-       else
-               *mode = st.st_mode;
-       return 0;
-}
-
-static int queue_diff(struct diff_options *o,
-               const char *name1, const char *name2)
-{
-       int mode1 = 0, mode2 = 0;
-
-       if (get_mode(name1, &mode1) || get_mode(name2, &mode2))
-               return -1;
-
-       if (mode1 && mode2 && S_ISDIR(mode1) != S_ISDIR(mode2))
-               return error("file/directory conflict: %s, %s", name1, name2);
-
-       if (S_ISDIR(mode1) || S_ISDIR(mode2)) {
-               char buffer1[PATH_MAX], buffer2[PATH_MAX];
-               struct path_list p1 = {NULL, 0, 0, 1}, p2 = {NULL, 0, 0, 1};
-               int len1 = 0, len2 = 0, i1, i2, ret = 0;
-
-               if (name1 && read_directory(name1, &p1))
-                       return -1;
-               if (name2 && read_directory(name2, &p2)) {
-                       path_list_clear(&p1, 0);
-                       return -1;
-               }
-
-               if (name1) {
-                       len1 = strlen(name1);
-                       if (len1 > 0 && name1[len1 - 1] == '/')
-                               len1--;
-                       memcpy(buffer1, name1, len1);
-                       buffer1[len1++] = '/';
-               }
-
-               if (name2) {
-                       len2 = strlen(name2);
-                       if (len2 > 0 && name2[len2 - 1] == '/')
-                               len2--;
-                       memcpy(buffer2, name2, len2);
-                       buffer2[len2++] = '/';
-               }
-
-               for (i1 = i2 = 0; !ret && (i1 < p1.nr || i2 < p2.nr); ) {
-                       const char *n1, *n2;
-                       int comp;
-
-                       if (i1 == p1.nr)
-                               comp = 1;
-                       else if (i2 == p2.nr)
-                               comp = -1;
-                       else
-                               comp = strcmp(p1.items[i1].path,
-                                       p2.items[i2].path);
-
-                       if (comp > 0)
-                               n1 = NULL;
-                       else {
-                               n1 = buffer1;
-                               strncpy(buffer1 + len1, p1.items[i1++].path,
-                                               PATH_MAX - len1);
-                       }
-
-                       if (comp < 0)
-                               n2 = NULL;
-                       else {
-                               n2 = buffer2;
-                               strncpy(buffer2 + len2, p2.items[i2++].path,
-                                               PATH_MAX - len2);
-                       }
-
-                       ret = queue_diff(o, n1, n2);
-               }
-               path_list_clear(&p1, 0);
-               path_list_clear(&p2, 0);
-
-               return ret;
-       } else {
-               struct diff_filespec *d1, *d2;
-
-               if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
-                       unsigned tmp;
-                       const char *tmp_c;
-                       tmp = mode1; mode1 = mode2; mode2 = tmp;
-                       tmp_c = name1; name1 = name2; name2 = tmp_c;
-               }
-
-               if (!name1)
-                       name1 = "/dev/null";
-               if (!name2)
-                       name2 = "/dev/null";
-               d1 = alloc_filespec(name1);
-               d2 = alloc_filespec(name2);
-               fill_filespec(d1, null_sha1, mode1);
-               fill_filespec(d2, null_sha1, mode2);
-
-               diff_queue(&diff_queued_diff, d1, d2);
-               return 0;
-       }
-}
-
-/*
- * Does the path name a blob in the working tree, or a directory
- * in the working tree?
- */
-static int is_in_index(const char *path)
-{
-       int len, pos;
-       struct cache_entry *ce;
-
-       len = strlen(path);
-       while (path[len-1] == '/')
-               len--;
-       if (!len)
-               return 1; /* "." */
-       pos = cache_name_pos(path, len);
-       if (0 <= pos)
-               return 1;
-       pos = -1 - pos;
-       while (pos < active_nr) {
-               ce = active_cache[pos++];
-               if (ce_namelen(ce) <= len ||
-                   strncmp(ce->name, path, len) ||
-                   (ce->name[len] > '/'))
-                       break; /* path cannot be a prefix */
-               if (ce->name[len] == '/')
-                       return 1;
-       }
-       return 0;
-}
-
-static int handle_diff_files_args(struct rev_info *revs,
-                                 int argc, const char **argv,
-                                 unsigned int *options)
-{
-       *options = 0;
-
-       /* revs->max_count == -2 means --no-index */
-       while (1 < argc && argv[1][0] == '-') {
-               if (!strcmp(argv[1], "--base"))
-                       revs->max_count = 1;
-               else if (!strcmp(argv[1], "--ours"))
-                       revs->max_count = 2;
-               else if (!strcmp(argv[1], "--theirs"))
-                       revs->max_count = 3;
-               else if (!strcmp(argv[1], "-n") ||
-                               !strcmp(argv[1], "--no-index")) {
-                       revs->max_count = -2;
-                       DIFF_OPT_SET(&revs->diffopt, EXIT_WITH_STATUS);
-                       DIFF_OPT_SET(&revs->diffopt, NO_INDEX);
-               }
-               else if (!strcmp(argv[1], "-q"))
-                       *options |= DIFF_SILENT_ON_REMOVED;
-               else
-                       return error("invalid option: %s", argv[1]);
-               argv++; argc--;
-       }
-
-       if (revs->max_count == -1 && revs->diffopt.nr_paths == 2) {
-               /*
-                * If two files are specified, and at least one is untracked,
-                * default to no-index.
-                */
-               read_cache();
-               if (!is_in_index(revs->diffopt.paths[0]) ||
-                                       !is_in_index(revs->diffopt.paths[1])) {
-                       revs->max_count = -2;
-                       DIFF_OPT_SET(&revs->diffopt, NO_INDEX);
-               }
-       }
-
-       /*
-        * Make sure there are NO revision (i.e. pending object) parameter,
-        * rev.max_count is reasonable (0 <= n <= 3),
-        * there is no other revision filtering parameters.
-        */
-       if (revs->pending.nr || revs->max_count > 3 ||
-           revs->min_age != -1 || revs->max_age != -1)
-               return error("no revision allowed with diff-files");
-
-       if (revs->max_count == -1 &&
-           (revs->diffopt.output_format & DIFF_FORMAT_PATCH))
-               revs->combine_merges = revs->dense_combined_merges = 1;
-
-       return 0;
-}
-
-static int is_outside_repo(const char *path, int nongit, const char *prefix)
-{
-       int i;
-       if (nongit || !strcmp(path, "-") || is_absolute_path(path))
-               return 1;
-       if (prefixcmp(path, "../"))
-               return 0;
-       if (!prefix)
-               return 1;
-       for (i = strlen(prefix); !prefixcmp(path, "../"); ) {
-               while (i > 0 && prefix[i - 1] != '/')
-                       i--;
-               if (--i < 0)
-                       return 1;
-               path += 3;
-       }
-       return 0;
-}
-
-int setup_diff_no_index(struct rev_info *revs,
-               int argc, const char ** argv, int nongit, const char *prefix)
-{
-       int i;
-       for (i = 1; i < argc; i++)
-               if (argv[i][0] != '-' || argv[i][1] == '\0')
-                       break;
-               else if (!strcmp(argv[i], "--")) {
-                       i++;
-                       break;
-               } else if (i < argc - 3 && !strcmp(argv[i], "--no-index")) {
-                       i = argc - 3;
-                       DIFF_OPT_SET(&revs->diffopt, EXIT_WITH_STATUS);
-                       break;
-               }
-       if (argc != i + 2 || (!is_outside_repo(argv[i + 1], nongit, prefix) &&
-                               !is_outside_repo(argv[i], nongit, prefix)))
-               return -1;
-
-       diff_setup(&revs->diffopt);
-       for (i = 1; i < argc - 2; )
-               if (!strcmp(argv[i], "--no-index"))
-                       i++;
-               else {
-                       int j = diff_opt_parse(&revs->diffopt,
-                                       argv + i, argc - i);
-                       if (!j)
-                               die("invalid diff option/value: %s", argv[i]);
-                       i += j;
-               }
-
-       if (prefix) {
-               int len = strlen(prefix);
-
-               revs->diffopt.paths = xcalloc(2, sizeof(char*));
-               for (i = 0; i < 2; i++) {
-                       const char *p = argv[argc - 2 + i];
-                       /*
-                        * stdin should be spelled as '-'; if you have
-                        * path that is '-', spell it as ./-.
-                        */
-                       p = (strcmp(p, "-")
-                            ? xstrdup(prefix_filename(prefix, len, p))
-                            : p);
-                       revs->diffopt.paths[i] = p;
-               }
-       }
-       else
-               revs->diffopt.paths = argv + argc - 2;
-       revs->diffopt.nr_paths = 2;
-       DIFF_OPT_SET(&revs->diffopt, NO_INDEX);
-       revs->max_count = -2;
-       if (diff_setup_done(&revs->diffopt) < 0)
-               die("diff_setup_done failed");
-       return 0;
-}
-
-int run_diff_files_cmd(struct rev_info *revs, int argc, const char **argv)
-{
-       unsigned int options;
-
-       if (handle_diff_files_args(revs, argc, argv, &options))
-               return -1;
-
-       if (DIFF_OPT_TST(&revs->diffopt, NO_INDEX)) {
-               if (revs->diffopt.nr_paths != 2)
-                       return error("need two files/directories with --no-index");
-               if (queue_diff(&revs->diffopt, revs->diffopt.paths[0],
-                               revs->diffopt.paths[1]))
-                       return -1;
-               diffcore_std(&revs->diffopt);
-               diff_flush(&revs->diffopt);
-               /*
-                * The return code for --no-index imitates diff(1):
-                * 0 = no changes, 1 = changes, else error
-                */
-               return revs->diffopt.found_changes;
-       }
-
-       if (read_cache() < 0) {
-               perror("read_cache");
-               return -1;
-       }
-       return run_diff_files(revs, options);
-}
 /*
- * See if work tree has an entity that can be staged.  Return 0 if so,
- * return 1 if not and return -1 if error.
+ * Has the work tree entity been removed?
+ *
+ * Return 1 if it was removed from the work tree, 0 if an entity to be
+ * compared with the cache entry ce still exists (the latter includes
+ * the case where a directory that is not a submodule repository
+ * exists for ce that is a submodule -- it is a submodule that is not
+ * checked out).  Return negative for an error.
  */
-static int check_work_tree_entity(const struct cache_entry *ce, struct stat *st, char *symcache)
+static int check_removed(const struct cache_entry *ce, struct stat *st)
 {
        if (lstat(ce->name, st) < 0) {
                if (errno != ENOENT && errno != ENOTDIR)
                        return -1;
                return 1;
        }
-       if (has_symlink_leading_path(ce->name, symcache))
+       if (has_symlink_leading_path(ce_namelen(ce), ce->name))
                return 1;
        if (S_ISDIR(st->st_mode)) {
                unsigned char sub[20];
-               if (resolve_gitlink_ref(ce->name, "HEAD", sub))
+
+               /*
+                * If ce is already a gitlink, we can have a plain
+                * directory (i.e. the submodule is not checked out),
+                * or a checked out submodule.  Either case this is not
+                * a case where something was removed from the work tree,
+                * so we will return 0.
+                *
+                * Otherwise, if the directory is not a submodule
+                * repository, that means ce which was a blob turned into
+                * a directory --- the blob was removed!
+                */
+               if (!S_ISGITLINK(ce->ce_mode) &&
+                   resolve_gitlink_ref(ce->name, "HEAD", sub))
                        return 1;
        }
        return 0;
@@ -399,7 +98,7 @@ int run_diff_files(struct rev_info *revs, unsigned int option)
                        memset(&(dpath->parent[0]), 0,
                               sizeof(struct combine_diff_parent)*5);
 
-                       changed = check_work_tree_entity(ce, &st, symcache);
+                       changed = check_removed(ce, &st);
                        if (!changed)
                                dpath->mode = ce_mode_from_stat(ce, st.st_mode);
                        else {
@@ -463,7 +162,7 @@ int run_diff_files(struct rev_info *revs, unsigned int option)
                if (ce_uptodate(ce))
                        continue;
 
-               changed = check_work_tree_entity(ce, &st, symcache);
+               changed = check_removed(ce, &st);
                if (changed) {
                        if (changed < 0) {
                                perror(ce->name);
@@ -472,17 +171,20 @@ int run_diff_files(struct rev_info *revs, unsigned int option)
                        if (silent_on_removed)
                                continue;
                        diff_addremove(&revs->diffopt, '-', ce->ce_mode,
-                                      ce->sha1, ce->name, NULL);
+                                      ce->sha1, ce->name);
                        continue;
                }
                changed = ce_match_stat(ce, &st, ce_option);
-               if (!changed && !DIFF_OPT_TST(&revs->diffopt, FIND_COPIES_HARDER))
-                       continue;
+               if (!changed) {
+                       ce_mark_uptodate(ce);
+                       if (!DIFF_OPT_TST(&revs->diffopt, FIND_COPIES_HARDER))
+                               continue;
+               }
                oldmode = ce->ce_mode;
                newmode = ce_mode_from_stat(ce, st.st_mode);
                diff_change(&revs->diffopt, oldmode, newmode,
                            ce->sha1, (changed ? null_sha1 : ce->sha1),
-                           ce->name, NULL);
+                           ce->name);
 
        }
        diffcore_std(&revs->diffopt);
@@ -506,7 +208,7 @@ static void diff_index_show_file(struct rev_info *revs,
                                 const unsigned char *sha1, unsigned int mode)
 {
        diff_addremove(&revs->diffopt, prefix[0], mode,
-                      sha1, ce->name, NULL);
+                      sha1, ce->name);
 }
 
 static int get_stat_data(struct cache_entry *ce,
@@ -521,7 +223,7 @@ static int get_stat_data(struct cache_entry *ce,
        if (!cached) {
                int changed;
                struct stat st;
-               changed = check_work_tree_entity(ce, &st, cbdata->symcache);
+               changed = check_removed(ce, &st);
                if (changed < 0)
                        return -1;
                else if (changed) {
@@ -610,7 +312,7 @@ static int show_modified(struct oneway_unpack_data *cbdata,
                return 0;
 
        diff_change(&revs->diffopt, oldmode, mode,
-                   old->sha1, sha1, old->name, NULL);
+                   old->sha1, sha1, old->name);
        return 0;
 }