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#include <stdio.h>
#include <git2.h>
#include <stdlib.h>
#include <string.h>
static git_repository *g_repo;
static void check(int error, const char *message)
{
if (error) {
fprintf(stderr, "%s (%d)\n", message, error);
exit(1);
}
}
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) [<options>] <object>\n");
exit(1);
}
static int check_str_param(
const char *arg, const char *pattern, const char **val)
{
size_t len = strlen(pattern);
if (strncmp(arg, pattern, len))
return 0;
*val = (const char *)(arg + len);
return 1;
}
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);
}
static void show_blob(const git_blob *blob)
{
/* ? Does this need crlf filtering? */
fwrite(git_blob_rawcontent(blob), git_blob_rawsize(blob), 1, stdout);
}
static void show_tree(const git_tree *tree)
{
size_t i, max_i = (int)git_tree_entrycount(tree);
char oidstr[GIT_OID_HEXSZ + 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));
}
}
static void show_commit(const git_commit *commit)
{
unsigned int i, max_i;
char oidstr[GIT_OID_HEXSZ + 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_HEXSZ + 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));
}
enum {
SHOW_TYPE = 1,
SHOW_SIZE = 2,
SHOW_NONE = 3,
SHOW_PRETTY = 4
};
int main(int argc, char *argv[])
{
const char *dir = ".", *rev = NULL;
int i, action = 0, verbose = 0;
git_object *obj = NULL;
char oidstr[GIT_OID_HEXSZ + 1];
git_threads_init();
for (i = 1; i < argc; ++i) {
char *a = argv[i];
if (a[0] != '-') {
if (rev != NULL)
usage("Only one rev should be provided", NULL);
else
rev = a;
}
else if (!strcmp(a, "-t"))
action = SHOW_TYPE;
else if (!strcmp(a, "-s"))
action = SHOW_SIZE;
else if (!strcmp(a, "-e"))
action = SHOW_NONE;
else if (!strcmp(a, "-p"))
action = SHOW_PRETTY;
else if (!strcmp(a, "-q"))
verbose = 0;
else if (!strcmp(a, "-v"))
verbose = 1;
else if (!strcmp(a, "--help") || !strcmp(a, "-h"))
usage(NULL, NULL);
else if (!check_str_param(a, "--git-dir=", &dir))
usage("Unknown option", a);
}
if (!action || !rev)
usage(NULL, NULL);
check(git_repository_open_ext(&g_repo, dir, 0, NULL),
"Could not open repository");
if (git_revparse_single(&obj, g_repo, rev) < 0) {
fprintf(stderr, "Could not resolve '%s'\n", rev);
exit(1);
}
if (verbose) {
char oidstr[GIT_OID_HEXSZ + 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 (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(git_repository_odb(&odb, g_repo), "Could not open ODB");
check(git_odb_read(&odbobj, odb, git_object_id(obj)),
"Could not find obj");
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_OBJ_BLOB:
show_blob((const git_blob *)obj);
break;
case GIT_OBJ_COMMIT:
show_commit((const git_commit *)obj);
break;
case GIT_OBJ_TREE:
show_tree((const git_tree *)obj);
break;
case GIT_OBJ_TAG:
show_tag((const git_tag *)obj);
break;
default:
printf("unknown %s\n", oidstr);
break;
}
break;
}
git_object_free(obj);
git_repository_free(g_repo);
git_threads_shutdown();
return 0;
}
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