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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_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));

}

}

/**

* 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_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

};

/* Forward declarations for option-parsing helper */

struct opts {

const char *dir;

const char *rev;

int action;

int verbose;

};

static void parse_opts(struct opts *o, int argc, char *argv[]);

/** Entry point for this command */

int main(int argc, char *argv[])

{

git_repository *repo;

struct opts o = { ".", NULL, 0, 0 };

git_object *obj = NULL;

char oidstr[GIT_OID_HEXSZ + 1];

git_threads_init();

parse_opts(&o, argc, argv);

check_lg2(git_repository_open_ext(&repo, o.dir, 0, NULL),

"Could not open repository", NULL);

check_lg2(git_revparse_single(&obj, repo, o.rev),

"Could not resolve", o.rev);

if (o.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 (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_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(repo);

git_threads_shutdown();

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 opts *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);

}