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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"
#include "remote.h"
#include "parse-options.h"
#include "branch.h"
#include "diff.h"
#include "revision.h"

static const char * const builtin_branch_usage[] = {
"git branch [options] [-r | -a] [--merged | --no-merged]",
"git branch [options] [-l] [-f] <branchname> [<start-point>]",
"git branch [options] [-r] (-d | -D) <branchname>",
"git branch [options] (-m | -M) [<oldbranch>] <newbranch>",
NULL
};

#define REF_LOCAL_BRANCH 0x01
#define REF_REMOTE_BRANCH 0x02

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

static int branch_use_color = -1;
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 enum merge_filter {
NO_FILTER = 0,
SHOW_NOT_MERGED,
SHOW_MERGED,
} merge_filter;
static unsigned char merge_filter_ref[20];

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);
}

static int git_branch_config(const char *var, const char *value, void *cb)
{
if (!strcmp(var, "color.branch")) {
branch_use_color = git_config_colorbool(var, value, -1);
return 0;
}
if (!prefixcmp(var, "color.branch.")) {
int slot = parse_branch_color_slot(var, 13);
if (!value)
return config_error_nonbool(var);
color_parse(value, var, branch_colors[slot]);
return 0;
}
return git_color_default_config(var, value, cb);
}

static const char *branch_get_color(enum color_branch ix)
{
if (branch_use_color > 0)
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;
struct strbuf bname = STRBUF_INIT;

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++, strbuf_release(&bname)) {
int len = strlen(argv[i]);

if (interpret_nth_last_branch(argv[i], &bname) != len)
strbuf_add(&bname, argv[i], len);

if (kinds == REF_LOCAL_BRANCH && !strcmp(head, bname.buf)) {
error("Cannot delete the branch '%s' "
"which you are currently on.", bname.buf);
ret = 1;
continue;
}

free(name);

name = xstrdup(mkpath(fmt, bname.buf));
if (!resolve_ref(name, sha1, 1, NULL)) {
error("%sbranch '%s' not found.",
remote, bname.buf);
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 an ancestor of "
"your current HEAD.\n"
"If you are sure you want to delete it, "
"run 'git branch -D %s'.", bname.buf, bname.buf);
ret = 1;
continue;
}

if (delete_ref(name, sha1, 0)) {
error("Error deleting %sbranch '%s'", remote,
bname.buf);
ret = 1;
} else {
struct strbuf buf = STRBUF_INIT;
printf("Deleted %sbranch %s (%s).\n", remote,
bname.buf,
find_unique_abbrev(sha1, DEFAULT_ABBREV));
strbuf_addf(&buf, "branch.%s", bname.buf);
if (git_config_rename_section(buf.buf, NULL) < 0)
warning("Update of config-file failed");
strbuf_release(&buf);
}
}

free(name);

return(ret);
}

struct ref_item {
char *name;
unsigned int kind;
struct commit *commit;
};

struct ref_list {
struct rev_info revs;
int index, alloc, maxwidth;
struct ref_item *list;
struct commit_list *with_commit;
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;
struct commit *commit;
int kind;
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
return 0;

commit = lookup_commit_reference_gently(sha1, 1);
if (!commit)
return error("branch '%s' does not point at a commit", refname);

/* Filter with with_commit if specified */
if (!is_descendant_of(commit, ref_list->with_commit))
return 0;

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

if (merge_filter != NO_FILTER)
add_pending_object(&ref_list->revs,
(struct object *)commit, refname);

/* 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;
newitem->commit = commit;
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 fill_tracking_info(struct strbuf *stat, const char *branch_name)
{
int ours, theirs;
struct branch *branch = branch_get(branch_name);

if (!stat_tracking_info(branch, &ours, &theirs) || (!ours && !theirs))
return;
if (!ours)
strbuf_addf(stat, "[behind %d] ", theirs);
else if (!theirs)
strbuf_addf(stat, "[ahead %d] ", ours);
else
strbuf_addf(stat, "[ahead %d, behind %d] ", ours, theirs);
}

static int matches_merge_filter(struct commit *commit)
{
int is_merged;

if (merge_filter == NO_FILTER)
return 1;

is_merged = !!(commit->object.flags & UNINTERESTING);
return (is_merged == (merge_filter == SHOW_MERGED));
}

static void print_ref_item(struct ref_item *item, int maxwidth, int verbose,
int abbrev, int current)
{
char c;
int color;
struct commit *commit = item->commit;

if (!matches_merge_filter(commit))
return;

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) {
struct strbuf subject = STRBUF_INIT, stat = STRBUF_INIT;
const char *sub = " **** invalid ref ****";

commit = item->commit;
if (commit && !parse_commit(commit)) {
pretty_print_commit(CMIT_FMT_ONELINE, commit,
&subject, 0, NULL, NULL, 0, 0);
sub = subject.buf;
}

if (item->kind == REF_LOCAL_BRANCH)
fill_tracking_info(&stat, item->name);

printf("%c %s%-*s%s %s %s%s\n", c, branch_get_color(color),
maxwidth, item->name,
branch_get_color(COLOR_BRANCH_RESET),
find_unique_abbrev(item->commit->object.sha1, abbrev),
stat.buf, sub);
strbuf_release(&stat);
strbuf_release(&subject);
} else {
printf("%c %s%s%s\n", c, branch_get_color(color), item->name,
branch_get_color(COLOR_BRANCH_RESET));
}
}

static int calc_maxwidth(struct ref_list *refs)
{
int i, l, w = 0;
for (i = 0; i < refs->index; i++) {
if (!matches_merge_filter(refs->list[i].commit))
continue;
l = strlen(refs->list[i].name);
if (l > w)
w = l;
}
return w;
}

static void print_ref_list(int kinds, int detached, int verbose, int abbrev, struct commit_list *with_commit)
{
int i;
struct ref_list ref_list;
struct commit *head_commit = lookup_commit_reference_gently(head_sha1, 1);

memset(&ref_list, 0, sizeof(ref_list));
ref_list.kinds = kinds;
ref_list.with_commit = with_commit;
if (merge_filter != NO_FILTER)
init_revisions(&ref_list.revs, NULL);
for_each_ref(append_ref, &ref_list);
if (merge_filter != NO_FILTER) {
struct commit *filter;
filter = lookup_commit_reference_gently(merge_filter_ref, 0);
filter->object.flags |= UNINTERESTING;
add_pending_object(&ref_list.revs,
(struct object *) filter, "");
ref_list.revs.limited = 1;
prepare_revision_walk(&ref_list.revs);
if (verbose)
ref_list.maxwidth = calc_maxwidth(&ref_list);
}

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

detached = (detached && (kinds & REF_LOCAL_BRANCH));
if (detached && head_commit &&
is_descendant_of(head_commit, with_commit)) {
struct ref_item item;
item.name = xstrdup("(no branch)");
item.kind = REF_LOCAL_BRANCH;
item.commit = head_commit;
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 void rename_branch(const char *oldname, const char *newname, int force)
{
struct strbuf oldref = STRBUF_INIT, newref = STRBUF_INIT, logmsg = STRBUF_INIT;
unsigned char sha1[20];
struct strbuf oldsection = STRBUF_INIT, newsection = STRBUF_INIT;

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

strbuf_addf(&oldref, "refs/heads/%s", oldname);

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

strbuf_addf(&newref, "refs/heads/%s", newname);

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

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

strbuf_addf(&logmsg, "Branch: renamed %s to %s",
oldref.buf, newref.buf);

if (rename_ref(oldref.buf, newref.buf, logmsg.buf))
die("Branch rename failed");
strbuf_release(&logmsg);

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

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

static int opt_parse_merge_filter(const struct option *opt, const char *arg, int unset)
{
merge_filter = ((opt->long_name[0] == 'n')
? SHOW_NOT_MERGED
: SHOW_MERGED);
if (unset)
merge_filter = SHOW_NOT_MERGED; /* b/c for --no-merged */
if (!arg)
arg = "HEAD";
if (get_sha1(arg, merge_filter_ref))
die("malformed object name %s", arg);
return 0;
}

int cmd_branch(int argc, const char **argv, const char *prefix)
{
int delete = 0, rename = 0, force_create = 0;
int verbose = 0, abbrev = DEFAULT_ABBREV, detached = 0;
int reflog = 0;
enum branch_track track;
int kinds = REF_LOCAL_BRANCH;
struct commit_list *with_commit = NULL;

struct option options[] = {
OPT_GROUP("Generic options"),
OPT__VERBOSE(&verbose),
OPT_SET_INT( 0 , "track", &track, "set up tracking mode (see git-pull(1))",
BRANCH_TRACK_EXPLICIT),
OPT_BOOLEAN( 0 , "color", &branch_use_color, "use colored output"),
OPT_SET_INT('r', NULL, &kinds, "act on remote-tracking branches",
REF_REMOTE_BRANCH),
{
OPTION_CALLBACK, 0, "contains", &with_commit, "commit",
"print only branches that contain the commit",
PARSE_OPT_LASTARG_DEFAULT,
parse_opt_with_commit, (intptr_t)"HEAD",
},
{
OPTION_CALLBACK, 0, "with", &with_commit, "commit",
"print only branches that contain the commit",
PARSE_OPT_HIDDEN | PARSE_OPT_LASTARG_DEFAULT,
parse_opt_with_commit, (intptr_t) "HEAD",
},
OPT__ABBREV(&abbrev),

OPT_GROUP("Specific git-branch actions:"),
OPT_SET_INT('a', NULL, &kinds, "list both remote-tracking and local branches",
REF_REMOTE_BRANCH | REF_LOCAL_BRANCH),
OPT_BIT('d', NULL, &delete, "delete fully merged branch", 1),
OPT_BIT('D', NULL, &delete, "delete branch (even if not merged)", 2),
OPT_BIT('m', NULL, &rename, "move/rename a branch and its reflog", 1),
OPT_BIT('M', NULL, &rename, "move/rename a branch, even if target exists", 2),
OPT_BOOLEAN('l', NULL, &reflog, "create the branch's reflog"),
OPT_BOOLEAN('f', NULL, &force_create, "force creation (when already exists)"),
{
OPTION_CALLBACK, 0, "no-merged", &merge_filter_ref,
"commit", "print only not merged branches",
PARSE_OPT_LASTARG_DEFAULT | PARSE_OPT_NONEG,
opt_parse_merge_filter, (intptr_t) "HEAD",
},
{
OPTION_CALLBACK, 0, "merged", &merge_filter_ref,
"commit", "print only merged branches",
PARSE_OPT_LASTARG_DEFAULT | PARSE_OPT_NONEG,
opt_parse_merge_filter, (intptr_t) "HEAD",
},
OPT_END(),
};

git_config(git_branch_config, NULL);

if (branch_use_color == -1)
branch_use_color = git_use_color_default;

track = git_branch_track;

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

argc = parse_options(argc, argv, options, builtin_branch_usage, 0);
if (!!delete + !!rename + !!force_create > 1)
usage_with_options(builtin_branch_usage, options);

if (delete)
return delete_branches(argc, argv, delete > 1, kinds);
else if (argc == 0)
print_ref_list(kinds, detached, verbose, abbrev, with_commit);
else if (rename && (argc == 1))
rename_branch(head, argv[0], rename > 1);
else if (rename && (argc == 2))
rename_branch(argv[0], argv[1], rename > 1);
else if (argc <= 2)
create_branch(head, argv[0], (argc == 2) ? argv[1] : head,
force_create, reflog, track);
else
usage_with_options(builtin_branch_usage, options);

return 0;
}
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