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/*
* libgit2 "cat-file" example - shows how to print data from the ODB
*
* Written by the libgit2 contributors
*
* To the extent possible under law, the author(s) have dedicated all copyright
* and related and neighboring rights to this software to the public domain
* worldwide. This software is distributed without any warranty.
*
* You should have received a copy of the CC0 Public Domain Dedication along
* with this software. If not, see
* <http://creativecommons.org/publicdomain/zero/1.0/>.
*/
#include "common.h"
static void print_signature(const char *header, const git_signature *sig)
{
char sign;
int offset, hours, minutes;
if (!sig)
return;
offset = sig->when.offset;
if (offset < 0) {
sign = '-';
offset = -offset;
} else {
sign = '+';
}
hours = offset / 60;
minutes = offset % 60;
printf("%s %s <%s> %ld %c%02d%02d\n",
header, sig->name, sig->email, (long)sig->when.time,
sign, hours, minutes);
}
/** Printing out a blob is simple, get the contents and print */
static void show_blob(const git_blob *blob)
{
/* ? Does this need crlf filtering? */
fwrite(git_blob_rawcontent(blob), (size_t)git_blob_rawsize(blob), 1, stdout);
}
/** Show each entry with its type, id and attributes */
static void show_tree(const git_tree *tree)
{
size_t i, max_i = (int)git_tree_entrycount(tree);
char oidstr[GIT_OID_SHA1_HEXSIZE + 1];
const git_tree_entry *te;
for (i = 0; i < max_i; ++i) {
te = git_tree_entry_byindex(tree, i);
git_oid_tostr(oidstr, sizeof(oidstr), git_tree_entry_id(te));
printf("%06o %s %s\t%s\n",
git_tree_entry_filemode(te),
git_object_type2string(git_tree_entry_type(te)),
oidstr, git_tree_entry_name(te));
}
}
/**
* Commits and tags have a few interesting fields in their header.
*/
static void show_commit(const git_commit *commit)
{
unsigned int i, max_i;
char oidstr[GIT_OID_SHA1_HEXSIZE + 1];
git_oid_tostr(oidstr, sizeof(oidstr), git_commit_tree_id(commit));
printf("tree %s\n", oidstr);
max_i = (unsigned int)git_commit_parentcount(commit);
for (i = 0; i < max_i; ++i) {
git_oid_tostr(oidstr, sizeof(oidstr), git_commit_parent_id(commit, i));
printf("parent %s\n", oidstr);
}
print_signature("author", git_commit_author(commit));
print_signature("committer", git_commit_committer(commit));
if (git_commit_message(commit))
printf("\n%s\n", git_commit_message(commit));
}
static void show_tag(const git_tag *tag)
{
char oidstr[GIT_OID_SHA1_HEXSIZE + 1];
git_oid_tostr(oidstr, sizeof(oidstr), git_tag_target_id(tag));;
printf("object %s\n", oidstr);
printf("type %s\n", git_object_type2string(git_tag_target_type(tag)));
printf("tag %s\n", git_tag_name(tag));
print_signature("tagger", git_tag_tagger(tag));
if (git_tag_message(tag))
printf("\n%s\n", git_tag_message(tag));
}
typedef enum {
SHOW_TYPE = 1,
SHOW_SIZE = 2,
SHOW_NONE = 3,
SHOW_PRETTY = 4
} catfile_mode;
/* Forward declarations for option-parsing helper */
struct catfile_options {
const char *dir;
const char *rev;
catfile_mode action;
int verbose;
};
static void parse_opts(struct catfile_options *o, int argc, char *argv[]);
/** Entry point for this command */
int lg2_cat_file(git_repository *repo, int argc, char *argv[])
{
struct catfile_options o = { ".", NULL, 0, 0 };
git_object *obj = NULL;
char oidstr[GIT_OID_SHA1_HEXSIZE + 1];
parse_opts(&o, argc, argv);
check_lg2(git_revparse_single(&obj, repo, o.rev),
"Could not resolve", o.rev);
if (o.verbose) {
char oidstr[GIT_OID_SHA1_HEXSIZE + 1];
git_oid_tostr(oidstr, sizeof(oidstr), git_object_id(obj));
printf("%s %s\n--\n",
git_object_type2string(git_object_type(obj)), oidstr);
}
switch (o.action) {
case SHOW_TYPE:
printf("%s\n", git_object_type2string(git_object_type(obj)));
break;
case SHOW_SIZE: {
git_odb *odb;
git_odb_object *odbobj;
check_lg2(git_repository_odb(&odb, repo), "Could not open ODB", NULL);
check_lg2(git_odb_read(&odbobj, odb, git_object_id(obj)),
"Could not find obj", NULL);
printf("%ld\n", (long)git_odb_object_size(odbobj));
git_odb_object_free(odbobj);
git_odb_free(odb);
}
break;
case SHOW_NONE:
/* just want return result */
break;
case SHOW_PRETTY:
switch (git_object_type(obj)) {
case GIT_OBJECT_BLOB:
show_blob((const git_blob *)obj);
break;
case GIT_OBJECT_COMMIT:
show_commit((const git_commit *)obj);
break;
case GIT_OBJECT_TREE:
show_tree((const git_tree *)obj);
break;
case GIT_OBJECT_TAG:
show_tag((const git_tag *)obj);
break;
default:
printf("unknown %s\n", oidstr);
break;
}
break;
}
git_object_free(obj);
return 0;
}
/** Print out usage information */
static void usage(const char *message, const char *arg)
{
if (message && arg)
fprintf(stderr, "%s: %s\n", message, arg);
else if (message)
fprintf(stderr, "%s\n", message);
fprintf(stderr,
"usage: cat-file (-t | -s | -e | -p) [-v] [-q] "
"[-h|--help] [--git-dir=<dir>] <object>\n");
exit(1);
}
/** Parse the command-line options taken from git */
static void parse_opts(struct catfile_options *o, int argc, char *argv[])
{
struct args_info args = ARGS_INFO_INIT;
for (args.pos = 1; args.pos < argc; ++args.pos) {
char *a = argv[args.pos];
if (a[0] != '-') {
if (o->rev != NULL)
usage("Only one rev should be provided", NULL);
else
o->rev = a;
}
else if (!strcmp(a, "-t"))
o->action = SHOW_TYPE;
else if (!strcmp(a, "-s"))
o->action = SHOW_SIZE;
else if (!strcmp(a, "-e"))
o->action = SHOW_NONE;
else if (!strcmp(a, "-p"))
o->action = SHOW_PRETTY;
else if (!strcmp(a, "-q"))
o->verbose = 0;
else if (!strcmp(a, "-v"))
o->verbose = 1;
else if (!strcmp(a, "--help") || !strcmp(a, "-h"))
usage(NULL, NULL);
else if (!match_str_arg(&o->dir, &args, "--git-dir"))
usage("Unknown option", a);
}
if (!o->action || !o->rev)
usage(NULL, NULL);
}
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