revision traversal: show full history with merge simplification

[git.git] / archive.c

diff --git a/archive.c b/archive.c
index 75eb2577602da1f2cd56ca416265c5efb14a96b1..f834b5f51f4cf5d3b73d21dfd99198caef3b19f8 100644 (file)
--- a/archive.c
+++ b/archive.c
@@ -1,8 +1,23 @@
 #include "cache.h"
 #include "commit.h"
+#include "tree-walk.h"
 #include "attr.h"
 #include "archive.h"
 
+static const char archive_usage[] = \
+"git archive --format=<fmt> [--prefix=<prefix>/] [--verbose] [<extra>] <tree-ish> [path...]";
+
+#define USES_ZLIB_COMPRESSION 1
+
+const struct archiver {
+       const char *name;
+       write_archive_fn_t write_archive;
+       unsigned int flags;
+} archivers[] = {
+       { "tar", write_tar_archive },
+       { "zip", write_zip_archive, USES_ZLIB_COMPRESSION },
+};
+
 static void format_subst(const struct commit *commit,
                          const char *src, size_t len,
                          struct strbuf *buf)
@@ -156,6 +171,132 @@ int write_archive_entries(struct archiver_args *args,
        return err;
 }
 
+static const struct archiver *lookup_archiver(const char *name)
+{
+       int i;
+
+       for (i = 0; i < ARRAY_SIZE(archivers); i++) {
+               if (!strcmp(name, archivers[i].name))
+                       return &archivers[i];
+       }
+       return NULL;
+}
+
+static void parse_pathspec_arg(const char **pathspec,
+               struct archiver_args *ar_args)
+{
+       ar_args->pathspec = get_pathspec(ar_args->base, pathspec);
+}
+
+static void parse_treeish_arg(const char **argv,
+               struct archiver_args *ar_args, const char *prefix)
+{
+       const char *name = argv[0];
+       const unsigned char *commit_sha1;
+       time_t archive_time;
+       struct tree *tree;
+       const struct commit *commit;
+       unsigned char sha1[20];
+
+       if (get_sha1(name, sha1))
+               die("Not a valid object name");
+
+       commit = lookup_commit_reference_gently(sha1, 1);
+       if (commit) {
+               commit_sha1 = commit->object.sha1;
+               archive_time = commit->date;
+       } else {
+               commit_sha1 = NULL;
+               archive_time = time(NULL);
+       }
+
+       tree = parse_tree_indirect(sha1);
+       if (tree == NULL)
+               die("not a tree object");
+
+       if (prefix) {
+               unsigned char tree_sha1[20];
+               unsigned int mode;
+               int err;
+
+               err = get_tree_entry(tree->object.sha1, prefix,
+                                    tree_sha1, &mode);
+               if (err || !S_ISDIR(mode))
+                       die("current working directory is untracked");
+
+               tree = parse_tree_indirect(tree_sha1);
+       }
+       ar_args->tree = tree;
+       ar_args->commit_sha1 = commit_sha1;
+       ar_args->commit = commit;
+       ar_args->time = archive_time;
+}
+
+static int parse_archive_args(int argc, const char **argv,
+               const struct archiver **ar, struct archiver_args *args)
+{
+       const char *format = "tar";
+       const char *base = "";
+       int compression_level = -1;
+       int verbose = 0;
+       int i;
+
+       for (i = 1; i < argc; i++) {
+               const char *arg = argv[i];
+
+               if (!strcmp(arg, "--list") || !strcmp(arg, "-l")) {
+                       for (i = 0; i < ARRAY_SIZE(archivers); i++)
+                               printf("%s\n", archivers[i].name);
+                       exit(0);
+               }
+               if (!strcmp(arg, "--verbose") || !strcmp(arg, "-v")) {
+                       verbose = 1;
+                       continue;
+               }
+               if (!prefixcmp(arg, "--format=")) {
+                       format = arg + 9;
+                       continue;
+               }
+               if (!prefixcmp(arg, "--prefix=")) {
+                       base = arg + 9;
+                       continue;
+               }
+               if (!strcmp(arg, "--")) {
+                       i++;
+                       break;
+               }
+               if (arg[0] == '-' && isdigit(arg[1]) && arg[2] == '\0') {
+                       compression_level = arg[1] - '0';
+                       continue;
+               }
+               if (arg[0] == '-')
+                       die("Unknown argument: %s", arg);
+               break;
+       }
+
+       /* We need at least one parameter -- tree-ish */
+       if (argc - 1 < i)
+               usage(archive_usage);
+       *ar = lookup_archiver(format);
+       if (!*ar)
+               die("Unknown archive format '%s'", format);
+
+       args->compression_level = Z_DEFAULT_COMPRESSION;
+       if (compression_level != -1) {
+               if ((*ar)->flags & USES_ZLIB_COMPRESSION)
+                       args->compression_level = compression_level;
+               else {
+                       die("Argument not supported for format '%s': -%d",
+                                       format, compression_level);
+               }
+       }
+       args->verbose = verbose;
+       args->base = base;
+       args->baselen = strlen(base);
+
+       return i;
+}
+
 int write_archive(int argc, const char **argv, const char *prefix,
                int setup_prefix)
 {