build-in git-mktree
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/builtin-mktree.c b/builtin-mktree.c
new file mode 100644
index 0000000..3d05427
--- /dev/null
+++ b/builtin-mktree.c
@@ -0,0 +1,127 @@
+/*
+ * GIT - the stupid content tracker
+ *
+ * Copyright (c) Junio C Hamano, 2006, 2009
+ */
+#include "builtin.h"
+#include "quote.h"
+#include "tree.h"
+
+static struct treeent {
+ unsigned mode;
+ unsigned char sha1[20];
+ int len;
+ char name[FLEX_ARRAY];
+} **entries;
+static int alloc, used;
+
+static void append_to_tree(unsigned mode, unsigned char *sha1, char *path)
+{
+ struct treeent *ent;
+ int len = strlen(path);
+ if (strchr(path, '/'))
+ die("path %s contains slash", path);
+
+ if (alloc <= used) {
+ alloc = alloc_nr(used);
+ entries = xrealloc(entries, sizeof(*entries) * alloc);
+ }
+ ent = entries[used++] = xmalloc(sizeof(**entries) + len + 1);
+ ent->mode = mode;
+ ent->len = len;
+ hashcpy(ent->sha1, sha1);
+ memcpy(ent->name, path, len+1);
+}
+
+static int ent_compare(const void *a_, const void *b_)
+{
+ struct treeent *a = *(struct treeent **)a_;
+ struct treeent *b = *(struct treeent **)b_;
+ return base_name_compare(a->name, a->len, a->mode,
+ b->name, b->len, b->mode);
+}
+
+static void write_tree(unsigned char *sha1)
+{
+ struct strbuf buf;
+ size_t size;
+ int i;
+
+ qsort(entries, used, sizeof(*entries), ent_compare);
+ for (size = i = 0; i < used; i++)
+ size += 32 + entries[i]->len;
+
+ strbuf_init(&buf, size);
+ for (i = 0; i < used; i++) {
+ struct treeent *ent = entries[i];
+ strbuf_addf(&buf, "%o %s%c", ent->mode, ent->name, '\0');
+ strbuf_add(&buf, ent->sha1, 20);
+ }
+
+ write_sha1_file(buf.buf, buf.len, tree_type, sha1);
+}
+
+static const char mktree_usage[] = "git mktree [-z]";
+
+int cmd_mktree(int ac, const char **av, const char *prefix)
+{
+ struct strbuf sb = STRBUF_INIT;
+ struct strbuf p_uq = STRBUF_INIT;
+ unsigned char sha1[20];
+ int line_termination = '\n';
+
+ while ((1 < ac) && av[1][0] == '-') {
+ const char *arg = av[1];
+ if (!strcmp("-z", arg))
+ line_termination = 0;
+ else
+ usage(mktree_usage);
+ ac--;
+ av++;
+ }
+
+ while (strbuf_getline(&sb, stdin, line_termination) != EOF) {
+ char *ptr, *ntr;
+ unsigned mode;
+ enum object_type type;
+ char *path;
+
+ ptr = sb.buf;
+ /*
+ * Read non-recursive ls-tree output format:
+ * mode SP type SP sha1 TAB name
+ */
+ mode = strtoul(ptr, &ntr, 8);
+ if (ptr == ntr || !ntr || *ntr != ' ')
+ die("input format error: %s", sb.buf);
+ ptr = ntr + 1; /* type */
+ ntr = strchr(ptr, ' ');
+ if (!ntr || sb.buf + sb.len <= ntr + 40 ||
+ ntr[41] != '\t' ||
+ get_sha1_hex(ntr + 1, sha1))
+ die("input format error: %s", sb.buf);
+ type = sha1_object_info(sha1, NULL);
+ if (type < 0)
+ die("object %s unavailable", sha1_to_hex(sha1));
+ *ntr++ = 0; /* now at the beginning of SHA1 */
+ if (type != type_from_string(ptr))
+ die("object type %s mismatch (%s)", ptr, typename(type));
+
+ path = ntr + 41; /* at the beginning of name */
+ if (line_termination && path[0] == '"') {
+ strbuf_reset(&p_uq);
+ if (unquote_c_style(&p_uq, path, NULL)) {
+ die("invalid quoting");
+ }
+ path = p_uq.buf;
+ }
+
+ append_to_tree(mode, sha1, path);
+ }
+ strbuf_release(&p_uq);
+ strbuf_release(&sb);
+
+ write_tree(sha1);
+ puts(sha1_to_hex(sha1));
+ exit(0);
+}
