* Copyright (C) Linus Torvalds, 2005
*/
#include "cache.h"
+#include "blob.h"
+#include "tree.h"
-int line_termination = '\n';
-int recursive = 0;
+static int line_termination = '\n';
+#define LS_RECURSIVE 1
+#define LS_TREE_ONLY 2
+static int ls_options = 0;
-struct path_prefix {
- struct path_prefix *prev;
- const char *name;
-};
+static struct tree_entry_list root_entry;
-static void print_path_prefix(struct path_prefix *prefix)
+static void prepare_root(unsigned char *sha1)
{
- if (prefix) {
- if (prefix->prev)
- print_path_prefix(prefix->prev);
- fputs(prefix->name, stdout);
- putchar('/');
+ unsigned char rsha[20];
+ unsigned long size;
+ void *buf;
+ struct tree *root_tree;
+
+ buf = read_object_with_reference(sha1, "tree", &size, rsha);
+ free(buf);
+ if (!buf)
+ die("Could not read %s", sha1_to_hex(sha1));
+
+ root_tree = lookup_tree(rsha);
+ if (!root_tree)
+ die("Could not read %s", sha1_to_hex(sha1));
+
+ /* Prepare a fake entry */
+ root_entry.directory = 1;
+ root_entry.executable = root_entry.symlink = 0;
+ root_entry.mode = S_IFDIR;
+ root_entry.name = "";
+ root_entry.item.tree = root_tree;
+ root_entry.parent = NULL;
+}
+
+static int prepare_children(struct tree_entry_list *elem)
+{
+ if (!elem->directory)
+ return -1;
+ if (!elem->item.tree->object.parsed) {
+ struct tree_entry_list *e;
+ if (parse_tree(elem->item.tree))
+ return -1;
+ /* Set up the parent link */
+ for (e = elem->item.tree->entries; e; e = e->next)
+ e->parent = elem;
}
+ return 0;
}
-static void list_recursive(void *buffer,
- const char *type,
- unsigned long size,
- struct path_prefix *prefix)
+static struct tree_entry_list *find_entry(const char *path)
{
- struct path_prefix this_prefix;
- this_prefix.prev = prefix;
-
- if (strcmp(type, "tree"))
- die("expected a 'tree' node");
-
- while (size) {
- int namelen = strlen(buffer)+1;
- void *eltbuf;
- char elttype[20];
- unsigned long eltsize;
- unsigned char *sha1 = buffer + namelen;
- char *path = strchr(buffer, ' ') + 1;
- unsigned int mode;
-
- if (size < namelen + 20 || sscanf(buffer, "%o", &mode) != 1)
- die("corrupt 'tree' file");
- buffer = sha1 + 20;
- size -= namelen + 20;
-
- printf("%06o\t%s\t%s\t", mode,
- S_ISDIR(mode) ? "tree" : "blob",
- sha1_to_hex(sha1));
- print_path_prefix(prefix);
- fputs(path, stdout);
- putchar(line_termination);
+ const char *next, *slash;
+ int len;
+ struct tree_entry_list *elem = &root_entry;
+
+ /* Find tree element, descending from root, that
+ * corresponds to the named path, lazily expanding
+ * the tree if possible.
+ */
+
+ while (path) {
+ /* The fact we still have path means that the caller
+ * wants us to make sure that elem at this point is a
+ * directory, and possibly descend into it. Even what
+ * is left is just trailing slashes, we loop back to
+ * here, and this call to prepare_children() will
+ * catch elem not being a tree. Nice.
+ */
+ if (prepare_children(elem))
+ return NULL;
+
+ slash = strchr(path, '/');
+ if (!slash) {
+ len = strlen(path);
+ next = NULL;
+ }
+ else {
+ next = slash + 1;
+ len = slash - path;
+ }
+ if (len) {
+ /* (len == 0) if the original path was "drivers/char/"
+ * and we have run already two rounds, having elem
+ * pointing at the drivers/char directory.
+ */
+ elem = elem->item.tree->entries;
+ while (elem) {
+ if ((strlen(elem->name) == len) &&
+ !strncmp(elem->name, path, len)) {
+ /* found */
+ break;
+ }
+ elem = elem->next;
+ }
+ if (!elem)
+ return NULL;
+ }
+ path = next;
+ }
- if (! recursive || ! S_ISDIR(mode))
- continue;
+ return elem;
+}
- if (! (eltbuf = read_sha1_file(sha1, elttype, &eltsize)) ) {
- error("cannot read %s", sha1_to_hex(sha1));
- continue;
- }
- this_prefix.name = path;
- list_recursive(eltbuf, elttype, eltsize, &this_prefix);
- free(eltbuf);
+static void show_entry_name(struct tree_entry_list *e)
+{
+ /* This is yucky. The root level is there for
+ * our convenience but we really want to do a
+ * forest.
+ */
+ if (e->parent && e->parent != &root_entry) {
+ show_entry_name(e->parent);
+ putchar('/');
}
+ printf("%s", e->name);
}
-static int list(unsigned char *sha1)
+static const char *entry_type(struct tree_entry_list *e)
{
- void *buffer;
- unsigned long size;
+ return (e->directory ? "tree" : "blob");
+}
+
+static const char *entry_hex(struct tree_entry_list *e)
+{
+ return sha1_to_hex(e->directory
+ ? e->item.tree->object.sha1
+ : e->item.blob->object.sha1);
+}
- buffer = read_object_with_reference(sha1, "tree", &size, 0);
- if (!buffer)
- die("unable to read sha1 file");
- list_recursive(buffer, "tree", size, NULL);
- free(buffer);
+/* forward declaration for mutually recursive routines */
+static int show_entry(struct tree_entry_list *, int);
+
+static int show_children(struct tree_entry_list *e, int level)
+{
+ if (prepare_children(e))
+ die("internal error: ls-tree show_children called with non tree");
+ e = e->item.tree->entries;
+ while (e) {
+ show_entry(e, level);
+ e = e->next;
+ }
return 0;
}
-static const char *ls_tree_usage = "git-ls-tree [-r] [-z] <key>";
+static int show_entry(struct tree_entry_list *e, int level)
+{
+ int err = 0;
+
+ if (e != &root_entry) {
+ printf("%06o %s %s ", e->mode, entry_type(e),
+ entry_hex(e));
+ show_entry_name(e);
+ putchar(line_termination);
+ }
+
+ if (e->directory) {
+ /* If this is a directory, we have the following cases:
+ * (1) This is the top-level request (explicit path from the
+ * command line, or "root" if there is no command line).
+ * a. Without any flag. We show direct children. We do not
+ * recurse into them.
+ * b. With -r. We do recurse into children.
+ * c. With -d. We do not recurse into children.
+ * (2) We came here because our caller is either (1-a) or
+ * (1-b).
+ * a. Without any flag. We do not show our children (which
+ * are grandchildren for the original request).
+ * b. With -r. We continue to recurse into our children.
+ * c. With -d. We should not have come here to begin with.
+ */
+ if (level == 0 && !(ls_options & LS_TREE_ONLY))
+ /* case (1)-a and (1)-b */
+ err = err | show_children(e, level+1);
+ else if (level && ls_options & LS_RECURSIVE)
+ /* case (2)-b */
+ err = err | show_children(e, level+1);
+ }
+ return err;
+}
+
+static int list_one(const char *path)
+{
+ int err = 0;
+ struct tree_entry_list *e = find_entry(path);
+ if (!e) {
+ /* traditionally ls-tree does not complain about
+ * missing path. We may change this later to match
+ * what "/bin/ls -a" does, which is to complain.
+ */
+ return err;
+ }
+ err = err | show_entry(e, 0);
+ return err;
+}
+
+static int list(char **path)
+{
+ int i;
+ int err = 0;
+ for (i = 0; path[i]; i++)
+ err = err | list_one(path[i]);
+ return err;
+}
+
+static const char ls_tree_usage[] =
+ "git-ls-tree [-d] [-r] [-z] <tree-ish> [path...]";
int main(int argc, char **argv)
{
+ static char *path0[] = { "", NULL };
+ char **path;
unsigned char sha1[20];
while (1 < argc && argv[1][0] == '-') {
line_termination = 0;
break;
case 'r':
- recursive = 1;
+ ls_options |= LS_RECURSIVE;
+ break;
+ case 'd':
+ ls_options |= LS_TREE_ONLY;
break;
default:
usage(ls_tree_usage);
argc--; argv++;
}
- if (argc != 2)
+ if (argc < 2)
usage(ls_tree_usage);
if (get_sha1(argv[1], sha1) < 0)
usage(ls_tree_usage);
- if (list(sha1) < 0)
+
+ path = (argc == 2) ? path0 : (argv + 2);
+ prepare_root(sha1);
+ if (list(path) < 0)
die("list failed");
return 0;
}