diff options
Diffstat (limited to 'builtin/cat-file.c')
| -rw-r--r-- | builtin/cat-file.c | 258 |
1 files changed, 258 insertions, 0 deletions
diff --git a/builtin/cat-file.c b/builtin/cat-file.c new file mode 100644 index 0000000000..a933eaa043 --- /dev/null +++ b/builtin/cat-file.c @@ -0,0 +1,258 @@ +/* + * GIT - The information manager from hell + * + * Copyright (C) Linus Torvalds, 2005 + */ +#include "cache.h" +#include "exec_cmd.h" +#include "tag.h" +#include "tree.h" +#include "builtin.h" +#include "parse-options.h" + +#define BATCH 1 +#define BATCH_CHECK 2 + +static void pprint_tag(const unsigned char *sha1, const char *buf, unsigned long size) +{ + /* the parser in tag.c is useless here. */ + const char *endp = buf + size; + const char *cp = buf; + + while (cp < endp) { + char c = *cp++; + if (c != '\n') + continue; + if (7 <= endp - cp && !memcmp("tagger ", cp, 7)) { + const char *tagger = cp; + + /* Found the tagger line. Copy out the contents + * of the buffer so far. + */ + write_or_die(1, buf, cp - buf); + + /* + * Do something intelligent, like pretty-printing + * the date. + */ + while (cp < endp) { + if (*cp++ == '\n') { + /* tagger to cp is a line + * that has ident and time. + */ + const char *sp = tagger; + char *ep; + unsigned long date; + long tz; + while (sp < cp && *sp != '>') + sp++; + if (sp == cp) { + /* give up */ + write_or_die(1, tagger, + cp - tagger); + break; + } + while (sp < cp && + !('0' <= *sp && *sp <= '9')) + sp++; + write_or_die(1, tagger, sp - tagger); + date = strtoul(sp, &ep, 10); + tz = strtol(ep, NULL, 10); + sp = show_date(date, tz, 0); + write_or_die(1, sp, strlen(sp)); + xwrite(1, "\n", 1); + break; + } + } + break; + } + if (cp < endp && *cp == '\n') + /* end of header */ + break; + } + /* At this point, we have copied out the header up to the end of + * the tagger line and cp points at one past \n. It could be the + * next header line after the tagger line, or it could be another + * \n that marks the end of the headers. We need to copy out the + * remainder as is. + */ + if (cp < endp) + write_or_die(1, cp, endp - cp); +} + +static int cat_one_file(int opt, const char *exp_type, const char *obj_name) +{ + unsigned char sha1[20]; + enum object_type type; + void *buf; + unsigned long size; + + if (get_sha1(obj_name, sha1)) + die("Not a valid object name %s", obj_name); + + buf = NULL; + switch (opt) { + case 't': + type = sha1_object_info(sha1, NULL); + if (type > 0) { + printf("%s\n", typename(type)); + return 0; + } + break; + + case 's': + type = sha1_object_info(sha1, &size); + if (type > 0) { + printf("%lu\n", size); + return 0; + } + break; + + case 'e': + return !has_sha1_file(sha1); + + case 'p': + type = sha1_object_info(sha1, NULL); + if (type < 0) + die("Not a valid object name %s", obj_name); + + /* custom pretty-print here */ + if (type == OBJ_TREE) { + const char *ls_args[3] = {"ls-tree", obj_name, NULL}; + return cmd_ls_tree(2, ls_args, NULL); + } + + buf = read_sha1_file(sha1, &type, &size); + if (!buf) + die("Cannot read object %s", obj_name); + if (type == OBJ_TAG) { + pprint_tag(sha1, buf, size); + return 0; + } + + /* otherwise just spit out the data */ + break; + case 0: + buf = read_object_with_reference(sha1, exp_type, &size, NULL); + break; + + default: + die("git cat-file: unknown option: %s", exp_type); + } + + if (!buf) + die("git cat-file %s: bad file", obj_name); + + write_or_die(1, buf, size); + return 0; +} + +static int batch_one_object(const char *obj_name, int print_contents) +{ + unsigned char sha1[20]; + enum object_type type = 0; + unsigned long size; + void *contents = contents; + + if (!obj_name) + return 1; + + if (get_sha1(obj_name, sha1)) { + printf("%s missing\n", obj_name); + fflush(stdout); + return 0; + } + + if (print_contents == BATCH) + contents = read_sha1_file(sha1, &type, &size); + else + type = sha1_object_info(sha1, &size); + + if (type <= 0) { + printf("%s missing\n", obj_name); + fflush(stdout); + return 0; + } + + printf("%s %s %lu\n", sha1_to_hex(sha1), typename(type), size); + fflush(stdout); + + if (print_contents == BATCH) { + write_or_die(1, contents, size); + printf("\n"); + fflush(stdout); + free(contents); + } + + return 0; +} + +static int batch_objects(int print_contents) +{ + struct strbuf buf = STRBUF_INIT; + + while (strbuf_getline(&buf, stdin, '\n') != EOF) { + int error = batch_one_object(buf.buf, print_contents); + if (error) + return error; + } + + return 0; +} + +static const char * const cat_file_usage[] = { + "git cat-file (-t|-s|-e|-p|<type>) <object>", + "git cat-file (--batch|--batch-check) < <list_of_objects>", + NULL +}; + +int cmd_cat_file(int argc, const char **argv, const char *prefix) +{ + int opt = 0, batch = 0; + const char *exp_type = NULL, *obj_name = NULL; + + const struct option options[] = { + OPT_GROUP("<type> can be one of: blob, tree, commit, tag"), + OPT_SET_INT('t', NULL, &opt, "show object type", 't'), + OPT_SET_INT('s', NULL, &opt, "show object size", 's'), + OPT_SET_INT('e', NULL, &opt, + "exit with zero when there's no error", 'e'), + OPT_SET_INT('p', NULL, &opt, "pretty-print object's content", 'p'), + OPT_SET_INT(0, "batch", &batch, + "show info and content of objects fed from the standard input", + BATCH), + OPT_SET_INT(0, "batch-check", &batch, + "show info about objects fed from the standard input", + BATCH_CHECK), + OPT_END() + }; + + git_config(git_default_config, NULL); + + if (argc != 3 && argc != 2) + usage_with_options(cat_file_usage, options); + + argc = parse_options(argc, argv, prefix, options, cat_file_usage, 0); + + if (opt) { + if (argc == 1) + obj_name = argv[0]; + else + usage_with_options(cat_file_usage, options); + } + if (!opt && !batch) { + if (argc == 2) { + exp_type = argv[0]; + obj_name = argv[1]; + } else + usage_with_options(cat_file_usage, options); + } + if (batch && (opt || argc)) { + usage_with_options(cat_file_usage, options); + } + + if (batch) + return batch_objects(batch); + + return cat_one_file(opt, exp_type, obj_name); +} |