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/*
* Builtin "git branch"
*
* Copyright (c) 2006 Kristian Høgsberg <krh@redhat.com>
* Based on git-branch.sh by Junio C Hamano.
*/

#include "cache.h"
#include "color.h"
#include "refs.h"
#include "commit.h"
#include "builtin.h"

static const char builtin_branch_usage[] =
  "git-branch [-r] (-d | -D) <branchname> | [--track | --no-track] [-l] [-f] <branchname> [<start-point>] | (-m | -M) [<oldbranch>] <newbranch> | [--color | --no-color] [-r | -a] [-v [--abbrev=<length> | --no-abbrev]]";

#define REF_UNKNOWN_TYPE 0x00
#define REF_LOCAL_BRANCH 0x01
#define REF_REMOTE_BRANCH 0x02
#define REF_TAG 0x04

static const char *head;
static unsigned char head_sha1[20];

static int branch_track_remotes;

static int branch_use_color;
static char branch_colors[][COLOR_MAXLEN] = {
"\033[m", /* reset */
"", /* PLAIN (normal) */
"\033[31m", /* REMOTE (red) */
"", /* LOCAL (normal) */
"\033[32m", /* CURRENT (green) */
};
enum color_branch {
COLOR_BRANCH_RESET = 0,
COLOR_BRANCH_PLAIN = 1,
COLOR_BRANCH_REMOTE = 2,
COLOR_BRANCH_LOCAL = 3,
COLOR_BRANCH_CURRENT = 4,
};

static int parse_branch_color_slot(const char *var, int ofs)
{
if (!strcasecmp(var+ofs, "plain"))
return COLOR_BRANCH_PLAIN;
if (!strcasecmp(var+ofs, "reset"))
return COLOR_BRANCH_RESET;
if (!strcasecmp(var+ofs, "remote"))
return COLOR_BRANCH_REMOTE;
if (!strcasecmp(var+ofs, "local"))
return COLOR_BRANCH_LOCAL;
if (!strcasecmp(var+ofs, "current"))
return COLOR_BRANCH_CURRENT;
die("bad config variable '%s'", var);
}

int git_branch_config(const char *var, const char *value)
{
if (!strcmp(var, "color.branch")) {
branch_use_color = git_config_colorbool(var, value);
return 0;
}
if (!prefixcmp(var, "color.branch.")) {
int slot = parse_branch_color_slot(var, 13);
color_parse(value, var, branch_colors[slot]);
return 0;
}
if (!strcmp(var, "branch.autosetupmerge"))
branch_track_remotes = git_config_bool(var, value);

return git_default_config(var, value);
}

const char *branch_get_color(enum color_branch ix)
{
if (branch_use_color)
return branch_colors[ix];
return "";
}

static int delete_branches(int argc, const char **argv, int force, int kinds)
{
struct commit *rev, *head_rev = head_rev;
unsigned char sha1[20];
char *name = NULL;
const char *fmt, *remote;
int i;
int ret = 0;

switch (kinds) {
case REF_REMOTE_BRANCH:
fmt = "refs/remotes/%s";
remote = "remote ";
force = 1;
break;
case REF_LOCAL_BRANCH:
fmt = "refs/heads/%s";
remote = "";
break;
default:
die("cannot use -a with -d");
}

if (!force) {
head_rev = lookup_commit_reference(head_sha1);
if (!head_rev)
die("Couldn't look up commit object for HEAD");
}
for (i = 0; i < argc; i++) {
if (kinds == REF_LOCAL_BRANCH && !strcmp(head, argv[i])) {
error("Cannot delete the branch '%s' "
"which you are currently on.", argv[i]);
ret = 1;
continue;
}

if (name)
free(name);

name = xstrdup(mkpath(fmt, argv[i]));
if (!resolve_ref(name, sha1, 1, NULL)) {
error("%sbranch '%s' not found.",
remote, argv[i]);
ret = 1;
continue;
}

rev = lookup_commit_reference(sha1);
if (!rev) {
error("Couldn't look up commit object for '%s'", name);
ret = 1;
continue;
}

/* This checks whether the merge bases of branch and
* HEAD contains branch -- which means that the HEAD
* contains everything in both.
*/

if (!force &&
!in_merge_bases(rev, &head_rev, 1)) {
error("The branch '%s' is not a strict subset of "
"your current HEAD.\n"
"If you are sure you want to delete it, "
"run 'git branch -D %s'.", argv[i], argv[i]);
ret = 1;
continue;
}

if (delete_ref(name, sha1)) {
error("Error deleting %sbranch '%s'", remote,
argv[i]);
ret = 1;
} else
printf("Deleted %sbranch %s.\n", remote, argv[i]);

}

if (name)
free(name);

return(ret);
}

struct ref_item {
char *name;
unsigned int kind;
unsigned char sha1[20];
};

struct ref_list {
int index, alloc, maxwidth;
struct ref_item *list;
int kinds;
};

static int append_ref(const char *refname, const unsigned char *sha1, int flags, void *cb_data)
{
struct ref_list *ref_list = (struct ref_list*)(cb_data);
struct ref_item *newitem;
int kind = REF_UNKNOWN_TYPE;
int len;

/* Detect kind */
if (!prefixcmp(refname, "refs/heads/")) {
kind = REF_LOCAL_BRANCH;
refname += 11;
} else if (!prefixcmp(refname, "refs/remotes/")) {
kind = REF_REMOTE_BRANCH;
refname += 13;
} else if (!prefixcmp(refname, "refs/tags/")) {
kind = REF_TAG;
refname += 10;
}

/* Don't add types the caller doesn't want */
if ((kind & ref_list->kinds) == 0)
return 0;

/* Resize buffer */
if (ref_list->index >= ref_list->alloc) {
ref_list->alloc = alloc_nr(ref_list->alloc);
ref_list->list = xrealloc(ref_list->list,
ref_list->alloc * sizeof(struct ref_item));
}

/* Record the new item */
newitem = &(ref_list->list[ref_list->index++]);
newitem->name = xstrdup(refname);
newitem->kind = kind;
hashcpy(newitem->sha1, sha1);
len = strlen(newitem->name);
if (len > ref_list->maxwidth)
ref_list->maxwidth = len;

return 0;
}

static void free_ref_list(struct ref_list *ref_list)
{
int i;

for (i = 0; i < ref_list->index; i++)
free(ref_list->list[i].name);
free(ref_list->list);
}

static int ref_cmp(const void *r1, const void *r2)
{
struct ref_item *c1 = (struct ref_item *)(r1);
struct ref_item *c2 = (struct ref_item *)(r2);

if (c1->kind != c2->kind)
return c1->kind - c2->kind;
return strcmp(c1->name, c2->name);
}

static void print_ref_item(struct ref_item *item, int maxwidth, int verbose,
int abbrev, int current)
{
char c;
int color;
struct commit *commit;
char subject[256];

switch (item->kind) {
case REF_LOCAL_BRANCH:
color = COLOR_BRANCH_LOCAL;
break;
case REF_REMOTE_BRANCH:
color = COLOR_BRANCH_REMOTE;
break;
default:
color = COLOR_BRANCH_PLAIN;
break;
}

c = ' ';
if (current) {
c = '*';
color = COLOR_BRANCH_CURRENT;
}

if (verbose) {
commit = lookup_commit(item->sha1);
if (commit && !parse_commit(commit))
pretty_print_commit(CMIT_FMT_ONELINE, commit, ~0,
subject, sizeof(subject), 0,
NULL, NULL, 0);
else
strcpy(subject, " **** invalid ref ****");
printf("%c %s%-*s%s %s %s\n", c, branch_get_color(color),
maxwidth, item->name,
branch_get_color(COLOR_BRANCH_RESET),
find_unique_abbrev(item->sha1, abbrev), subject);
} else {
printf("%c %s%s%s\n", c, branch_get_color(color), item->name,
branch_get_color(COLOR_BRANCH_RESET));
}
}

static void print_ref_list(int kinds, int detached, int verbose, int abbrev)
{
int i;
struct ref_list ref_list;

memset(&ref_list, 0, sizeof(ref_list));
ref_list.kinds = kinds;
for_each_ref(append_ref, &ref_list);

qsort(ref_list.list, ref_list.index, sizeof(struct ref_item), ref_cmp);

detached = (detached && (kinds & REF_LOCAL_BRANCH));
if (detached) {
struct ref_item item;
item.name = xstrdup("(no branch)");
item.kind = REF_LOCAL_BRANCH;
hashcpy(item.sha1, head_sha1);
if (strlen(item.name) > ref_list.maxwidth)
ref_list.maxwidth = strlen(item.name);
print_ref_item(&item, ref_list.maxwidth, verbose, abbrev, 1);
free(item.name);
}

for (i = 0; i < ref_list.index; i++) {
int current = !detached &&
(ref_list.list[i].kind == REF_LOCAL_BRANCH) &&
!strcmp(ref_list.list[i].name, head);
print_ref_item(&ref_list.list[i], ref_list.maxwidth, verbose,
abbrev, current);
}

free_ref_list(&ref_list);
}

static char *config_repo;
static char *config_remote;
static const char *start_ref;
static int start_len;
static int base_len;

static int get_remote_branch_name(const char *value)
{
const char *colon;
const char *end;

if (*value == '+')
value++;

colon = strchr(value, ':');
if (!colon)
return 0;

end = value + strlen(value);

/* Try an exact match first. */
if (!strcmp(colon + 1, start_ref)) {
/* Truncate the value before the colon. */
nfasprintf(&config_repo, "%.*s", colon - value, value);
return 1;
}

/* Try with a wildcard match now. */
if (end - value > 2 && end[-2] == '/' && end[-1] == '*' &&
colon - value > 2 && colon[-2] == '/' && colon[-1] == '*' &&
(end - 2) - (colon + 1) == base_len &&
!strncmp(colon + 1, start_ref, base_len)) {
/* Replace the star with the remote branch name. */
nfasprintf(&config_repo, "%.*s%s",
(colon - 2) - value, value,
start_ref + base_len);
return 1;
}

return 0;
}

static int get_remote_config(const char *key, const char *value)
{
const char *var;
if (prefixcmp(key, "remote."))
return 0;

var = strrchr(key, '.');
if (var == key + 6)
return 0;

if (!strcmp(var, ".fetch") && get_remote_branch_name(value))
nfasprintf(&config_remote, "%.*s", var - (key + 7), key + 7);

return 0;
}

static void set_branch_merge(const char *name, const char *config_remote,
const char *config_repo)
{
char key[1024];
if (sizeof(key) <=
snprintf(key, sizeof(key), "branch.%s.remote", name))
die("what a long branch name you have!");
git_config_set(key, config_remote);

/*
* We do not have to check if we have enough space for
* the 'merge' key, since it's shorter than the
* previous 'remote' key, which we already checked.
*/
snprintf(key, sizeof(key), "branch.%s.merge", name);
git_config_set(key, config_repo);
}

static void set_branch_defaults(const char *name, const char *real_ref)
{
const char *slash = strrchr(real_ref, '/');

if (!slash)
return;

start_ref = real_ref;
start_len = strlen(real_ref);
base_len = slash - real_ref;
git_config(get_remote_config);
if (!config_repo && !config_remote &&
!prefixcmp(real_ref, "refs/heads/")) {
set_branch_merge(name, ".", real_ref);
printf("Branch %s set up to track local branch %s.\n",
name, real_ref);
}

if (config_repo && config_remote) {
set_branch_merge(name, config_remote, config_repo);
printf("Branch %s set up to track remote branch %s.\n",
name, real_ref);
}

if (config_repo)
free(config_repo);
if (config_remote)
free(config_remote);
}

static void create_branch(const char *name, const char *start_name,
int force, int reflog, int track)
{
struct ref_lock *lock;
struct commit *commit;
unsigned char sha1[20];
char *real_ref, ref[PATH_MAX], msg[PATH_MAX + 20];
int forcing = 0;

snprintf(ref, sizeof ref, "refs/heads/%s", name);
if (check_ref_format(ref))
die("'%s' is not a valid branch name.", name);

if (resolve_ref(ref, sha1, 1, NULL)) {
if (!force)
die("A branch named '%s' already exists.", name);
else if (!is_bare_repository() && !strcmp(head, name))
die("Cannot force update the current branch.");
forcing = 1;
}

real_ref = NULL;
if (get_sha1(start_name, sha1))
die("Not a valid object name: '%s'.", start_name);

switch (dwim_ref(start_name, strlen(start_name), sha1, &real_ref)) {
case 0:
/* Not branching from any existing branch */
real_ref = NULL;
break;
case 1:
/* Unique completion -- good */
break;
default:
die("Ambiguous object name: '%s'.", start_name);
break;
}

if ((commit = lookup_commit_reference(sha1)) == NULL)
die("Not a valid branch point: '%s'.", start_name);
hashcpy(sha1, commit->object.sha1);

lock = lock_any_ref_for_update(ref, NULL);
if (!lock)
die("Failed to lock ref for update: %s.", strerror(errno));

if (reflog)
log_all_ref_updates = 1;

if (forcing)
snprintf(msg, sizeof msg, "branch: Reset from %s",
start_name);
else
snprintf(msg, sizeof msg, "branch: Created from %s",
start_name);

/* When branching off a remote branch, set up so that git-pull
automatically merges from there. So far, this is only done for
remotes registered via .git/config. */
if (real_ref && track)
set_branch_defaults(name, real_ref);

if (write_ref_sha1(lock, sha1, msg) < 0)
die("Failed to write ref: %s.", strerror(errno));

if (real_ref)
free(real_ref);
}

static void rename_branch(const char *oldname, const char *newname, int force)
{
char oldref[PATH_MAX], newref[PATH_MAX], logmsg[PATH_MAX*2 + 100];
unsigned char sha1[20];
char oldsection[PATH_MAX], newsection[PATH_MAX];

if (!oldname)
die("cannot rename the current branch while not on any.");

if (snprintf(oldref, sizeof(oldref), "refs/heads/%s", oldname) > sizeof(oldref))
die("Old branchname too long");

if (check_ref_format(oldref))
die("Invalid branch name: %s", oldref);

if (snprintf(newref, sizeof(newref), "refs/heads/%s", newname) > sizeof(newref))
die("New branchname too long");

if (check_ref_format(newref))
die("Invalid branch name: %s", newref);

if (resolve_ref(newref, sha1, 1, NULL) && !force)
die("A branch named '%s' already exists.", newname);

snprintf(logmsg, sizeof(logmsg), "Branch: renamed %s to %s",
oldref, newref);

if (rename_ref(oldref, newref, logmsg))
die("Branch rename failed");

/* no need to pass logmsg here as HEAD didn't really move */
if (!strcmp(oldname, head) && create_symref("HEAD", newref, NULL))
die("Branch renamed to %s, but HEAD is not updated!", newname);

snprintf(oldsection, sizeof(oldsection), "branch.%s", oldref + 11);
snprintf(newsection, sizeof(newsection), "branch.%s", newref + 11);
if (git_config_rename_section(oldsection, newsection) < 0)
die("Branch is renamed, but update of config-file failed");
}

int cmd_branch(int argc, const char **argv, const char *prefix)
{
int delete = 0, force_delete = 0, force_create = 0;
int rename = 0, force_rename = 0;
int verbose = 0, abbrev = DEFAULT_ABBREV, detached = 0;
int reflog = 0, track;
int kinds = REF_LOCAL_BRANCH;
int i;

git_config(git_branch_config);
track = branch_track_remotes;

for (i = 1; i < argc; i++) {
const char *arg = argv[i];

if (arg[0] != '-')
break;
if (!strcmp(arg, "--")) {
i++;
break;
}
if (!strcmp(arg, "--track")) {
track = 1;
continue;
}
if (!strcmp(arg, "--no-track")) {
track = 0;
continue;
}
if (!strcmp(arg, "-d")) {
delete = 1;
continue;
}
if (!strcmp(arg, "-D")) {
delete = 1;
force_delete = 1;
continue;
}
if (!strcmp(arg, "-f")) {
force_create = 1;
continue;
}
if (!strcmp(arg, "-m")) {
rename = 1;
continue;
}
if (!strcmp(arg, "-M")) {
rename = 1;
force_rename = 1;
continue;
}
if (!strcmp(arg, "-r")) {
kinds = REF_REMOTE_BRANCH;
continue;
}
if (!strcmp(arg, "-a")) {
kinds = REF_REMOTE_BRANCH | REF_LOCAL_BRANCH;
continue;
}
if (!strcmp(arg, "-l")) {
reflog = 1;
continue;
}
if (!prefixcmp(arg, "--no-abbrev")) {
abbrev = 0;
continue;
}
if (!prefixcmp(arg, "--abbrev=")) {
abbrev = strtoul(arg + 9, NULL, 10);
if (abbrev < MINIMUM_ABBREV)
abbrev = MINIMUM_ABBREV;
else if (abbrev > 40)
abbrev = 40;
continue;
}
if (!strcmp(arg, "-v")) {
verbose = 1;
continue;
}
if (!strcmp(arg, "--color")) {
branch_use_color = 1;
continue;
}
if (!strcmp(arg, "--no-color")) {
branch_use_color = 0;
continue;
}
usage(builtin_branch_usage);
}

if ((delete && rename) || (delete && force_create) ||
(rename && force_create))
usage(builtin_branch_usage);

head = xstrdup(resolve_ref("HEAD", head_sha1, 0, NULL));
if (!head)
die("Failed to resolve HEAD as a valid ref.");
if (!strcmp(head, "HEAD")) {
detached = 1;
}
else {
if (prefixcmp(head, "refs/heads/"))
die("HEAD not found below refs/heads!");
head += 11;
}

if (delete)
return delete_branches(argc - i, argv + i, force_delete, kinds);
else if (i == argc)
print_ref_list(kinds, detached, verbose, abbrev);
else if (rename && (i == argc - 1))
rename_branch(head, argv[i], force_rename);
else if (rename && (i == argc - 2))
rename_branch(argv[i], argv[i + 1], force_rename);
else if (i == argc - 1 || i == argc - 2)
create_branch(argv[i], (i == argc - 2) ? argv[i+1] : head,
force_create, reflog, track);
else
usage(builtin_branch_usage);

return 0;
}
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