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/*
* Check-out files from the "current cache directory"
*
* Copyright (C) 2005 Linus Torvalds
*
* Careful: order of argument flags does matter. For example,
*
* git checkout-index -a -f file.c
*
* Will first check out all files listed in the cache (but not
* overwrite any old ones), and then force-checkout "file.c" a
* second time (ie that one _will_ overwrite any old contents
* with the same filename).
*
* Also, just doing "git checkout-index" does nothing. You probably
* meant "git checkout-index -a". And if you want to force it, you
* want "git checkout-index -f -a".
*
* Intuitiveness is not the goal here. Repeatability is. The
* reason for the "no arguments means no work" thing is that
* from scripts you are supposed to be able to do things like
*
* find . -name '*.h' -print0 | xargs -0 git checkout-index -f --
*
* or:
*
* find . -name '*.h' -print0 | git checkout-index -f -z --stdin
*
* which will force all existing *.h files to be replaced with
* their cached copies. If an empty command line implied "all",
* then this would force-refresh everything in the cache, which
* was not the point.
*
* Oh, and the "--" is just a good idea when you know the rest
* will be filenames. Just so that you wouldn't have a filename
* of "-a" causing problems (not possible in the above example,
* but get used to it in scripting!).
*/
#include "builtin.h"
#include "cache.h"
#include "quote.h"
#include "cache-tree.h"
#include "parse-options.h"

#define CHECKOUT_ALL 4
static int line_termination = '\n';
static int checkout_stage; /* default to checkout stage0 */
static int to_tempfile;
static char topath[4][PATH_MAX + 1];

static struct checkout state;

static void write_tempfile_record(const char *name, int prefix_length)
{
int i;

if (CHECKOUT_ALL == checkout_stage) {
for (i = 1; i < 4; i++) {
if (i > 1)
putchar(' ');
if (topath[i][0])
fputs(topath[i], stdout);
else
putchar('.');
}
} else
fputs(topath[checkout_stage], stdout);

putchar('\t');
write_name_quoted(name + prefix_length, stdout, line_termination);

for (i = 0; i < 4; i++) {
topath[i][0] = 0;
}
}

static int checkout_file(const char *name, int prefix_length)
{
int namelen = strlen(name);
int pos = cache_name_pos(name, namelen);
int has_same_name = 0;
int did_checkout = 0;
int errs = 0;

if (pos < 0)
pos = -pos - 1;

while (pos < active_nr) {
struct cache_entry *ce = active_cache[pos];
if (ce_namelen(ce) != namelen ||
memcmp(ce->name, name, namelen))
break;
has_same_name = 1;
pos++;
if (ce_stage(ce) != checkout_stage
&& (CHECKOUT_ALL != checkout_stage || !ce_stage(ce)))
continue;
did_checkout = 1;
if (checkout_entry(ce, &state,
to_tempfile ? topath[ce_stage(ce)] : NULL) < 0)
errs++;
}

if (did_checkout) {
if (to_tempfile)
write_tempfile_record(name, prefix_length);
return errs > 0 ? -1 : 0;
}

if (!state.quiet) {
fprintf(stderr, "git checkout-index: %s ", name);
if (!has_same_name)
fprintf(stderr, "is not in the cache");
else if (checkout_stage)
fprintf(stderr, "does not exist at stage %d",
checkout_stage);
else
fprintf(stderr, "is unmerged");
fputc('\n', stderr);
}
return -1;
}

static void checkout_all(const char *prefix, int prefix_length)
{
int i, errs = 0;
struct cache_entry *last_ce = NULL;

for (i = 0; i < active_nr ; i++) {
struct cache_entry *ce = active_cache[i];
if (ce_stage(ce) != checkout_stage
&& (CHECKOUT_ALL != checkout_stage || !ce_stage(ce)))
continue;
if (prefix && *prefix &&
(ce_namelen(ce) <= prefix_length ||
memcmp(prefix, ce->name, prefix_length)))
continue;
if (last_ce && to_tempfile) {
if (ce_namelen(last_ce) != ce_namelen(ce)
|| memcmp(last_ce->name, ce->name, ce_namelen(ce)))
write_tempfile_record(last_ce->name, prefix_length);
}
if (checkout_entry(ce, &state,
to_tempfile ? topath[ce_stage(ce)] : NULL) < 0)
errs++;
last_ce = ce;
}
if (last_ce && to_tempfile)
write_tempfile_record(last_ce->name, prefix_length);
if (errs)
/* we have already done our error reporting.
* exit with the same code as die().
*/
exit(128);
}

static const char * const builtin_checkout_index_usage[] = {
"git checkout-index [options] [--] <file>...",
NULL
};

static struct lock_file lock_file;

static int option_parse_u(const struct option *opt,
const char *arg, int unset)
{
int *newfd = opt->value;

state.refresh_cache = 1;
if (*newfd < 0)
*newfd = hold_locked_index(&lock_file, 1);
return 0;
}

static int option_parse_z(const struct option *opt,
const char *arg, int unset)
{
if (unset)
line_termination = '\n';
else
line_termination = 0;
return 0;
}

static int option_parse_prefix(const struct option *opt,
const char *arg, int unset)
{
state.base_dir = arg;
state.base_dir_len = strlen(arg);
return 0;
}

static int option_parse_stage(const struct option *opt,
const char *arg, int unset)
{
if (!strcmp(arg, "all")) {
to_tempfile = 1;
checkout_stage = CHECKOUT_ALL;
} else {
int ch = arg[0];
if ('1' <= ch && ch <= '3')
checkout_stage = arg[0] - '0';
else
die("stage should be between 1 and 3 or all");
}
return 0;
}

int cmd_checkout_index(int argc, const char **argv, const char *prefix)
{
int i;
int newfd = -1;
int all = 0;
int read_from_stdin = 0;
int prefix_length;
int force = 0, quiet = 0, not_new = 0;
struct option builtin_checkout_index_options[] = {
OPT_BOOLEAN('a', "all", &all,
"checks out all files in the index"),
OPT_BOOLEAN('f', "force", &force,
"forces overwrite of existing files"),
OPT__QUIET(&quiet),
OPT_BOOLEAN('n', "no-create", &not_new,
"don't checkout new files"),
{ OPTION_CALLBACK, 'u', "index", &newfd, NULL,
"update stat information in the index file",
PARSE_OPT_NOARG, option_parse_u },
{ OPTION_CALLBACK, 'z', NULL, NULL, NULL,
"paths are separated with NUL character",
PARSE_OPT_NOARG, option_parse_z },
OPT_BOOLEAN(0, "stdin", &read_from_stdin,
"read list of paths from the standard input"),
OPT_BOOLEAN(0, "temp", &to_tempfile,
"write the content to temporary files"),
OPT_CALLBACK(0, "prefix", NULL, "string",
"when creating files, prepend <string>",
option_parse_prefix),
OPT_CALLBACK(0, "stage", NULL, NULL,
"copy out the files from named stage",
option_parse_stage),
OPT_END()
};

git_config(git_default_config, NULL);
state.base_dir = "";
prefix_length = prefix ? strlen(prefix) : 0;

if (read_cache() < 0) {
die("invalid cache");
}

argc = parse_options(argc, argv, prefix, builtin_checkout_index_options,
builtin_checkout_index_usage, 0);
state.force = force;
state.quiet = quiet;
state.not_new = not_new;

if (state.base_dir_len || to_tempfile) {
/* when --prefix is specified we do not
* want to update cache.
*/
if (state.refresh_cache) {
rollback_lock_file(&lock_file);
newfd = -1;
}
state.refresh_cache = 0;
}

/* Check out named files first */
for (i = 0; i < argc; i++) {
const char *arg = argv[i];
const char *p;

if (all)
die("git checkout-index: don't mix '--all' and explicit filenames");
if (read_from_stdin)
die("git checkout-index: don't mix '--stdin' and explicit filenames");
p = prefix_path(prefix, prefix_length, arg);
checkout_file(p, prefix_length);
if (p < arg || p > arg + strlen(arg))
free((char *)p);
}

if (read_from_stdin) {
struct strbuf buf = STRBUF_INIT, nbuf = STRBUF_INIT;

if (all)
die("git checkout-index: don't mix '--all' and '--stdin'");

while (strbuf_getline(&buf, stdin, line_termination) != EOF) {
const char *p;
if (line_termination && buf.buf[0] == '"') {
strbuf_reset(&nbuf);
if (unquote_c_style(&nbuf, buf.buf, NULL))
die("line is badly quoted");
strbuf_swap(&buf, &nbuf);
}
p = prefix_path(prefix, prefix_length, buf.buf);
checkout_file(p, prefix_length);
if (p < buf.buf || p > buf.buf + buf.len)
free((char *)p);
}
strbuf_release(&nbuf);
strbuf_release(&buf);
}

if (all)
checkout_all(prefix, prefix_length);

if (0 <= newfd &&
(write_cache(newfd, active_cache, active_nr) ||
commit_locked_index(&lock_file)))
die("Unable to write new index file");
return 0;
}
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