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/*
* "diff --no-index" support
* Copyright (c) 2007 by Johannes Schindelin
* Copyright (c) 2008 by Junio C Hamano
*/

#include "cache.h"
#include "color.h"
#include "commit.h"
#include "blob.h"
#include "tag.h"
#include "diff.h"
#include "diffcore.h"
#include "revision.h"
#include "log-tree.h"
#include "builtin.h"
#include "string-list.h"

static int read_directory(const char *path, struct string_list *list)
{
DIR *dir;
struct dirent *e;

if (!(dir = opendir(path)))
return error("Could not open directory %s", path);

while ((e = readdir(dir)))
if (strcmp(".", e->d_name) && strcmp("..", e->d_name))
string_list_insert(list, e->d_name);

closedir(dir);
return 0;
}

static int get_mode(const char *path, int *mode)
{
struct stat st;

if (!path || !strcmp(path, "/dev/null"))
*mode = 0;
#ifdef _WIN32
else if (!strcasecmp(path, "nul"))
*mode = 0;
#endif
else if (!strcmp(path, "-"))
*mode = create_ce_mode(0666);
else if (lstat(path, &st))
return error("Could not access '%s'", path);
else
*mode = st.st_mode;
return 0;
}

static int queue_diff(struct diff_options *o,
const char *name1, const char *name2)
{
int mode1 = 0, mode2 = 0;

if (get_mode(name1, &mode1) || get_mode(name2, &mode2))
return -1;

if (mode1 && mode2 && S_ISDIR(mode1) != S_ISDIR(mode2))
return error("file/directory conflict: %s, %s", name1, name2);

if (S_ISDIR(mode1) || S_ISDIR(mode2)) {
struct strbuf buffer1 = STRBUF_INIT;
struct strbuf buffer2 = STRBUF_INIT;
struct string_list p1 = STRING_LIST_INIT_DUP;
struct string_list p2 = STRING_LIST_INIT_DUP;
int i1, i2, ret = 0;
size_t len1 = 0, len2 = 0;

if (name1 && read_directory(name1, &p1))
return -1;
if (name2 && read_directory(name2, &p2)) {
string_list_clear(&p1, 0);
return -1;
}

if (name1) {
strbuf_addstr(&buffer1, name1);
if (buffer1.len && buffer1.buf[buffer1.len - 1] != '/')
strbuf_addch(&buffer1, '/');
len1 = buffer1.len;
}

if (name2) {
strbuf_addstr(&buffer2, name2);
if (buffer2.len && buffer2.buf[buffer2.len - 1] != '/')
strbuf_addch(&buffer2, '/');
len2 = buffer2.len;
}

for (i1 = i2 = 0; !ret && (i1 < p1.nr || i2 < p2.nr); ) {
const char *n1, *n2;
int comp;

strbuf_setlen(&buffer1, len1);
strbuf_setlen(&buffer2, len2);

if (i1 == p1.nr)
comp = 1;
else if (i2 == p2.nr)
comp = -1;
else
comp = strcmp(p1.items[i1].string, p2.items[i2].string);

if (comp > 0)
n1 = NULL;
else {
strbuf_addstr(&buffer1, p1.items[i1++].string);
n1 = buffer1.buf;
}

if (comp < 0)
n2 = NULL;
else {
strbuf_addstr(&buffer2, p2.items[i2++].string);
n2 = buffer2.buf;
}

ret = queue_diff(o, n1, n2);
}
string_list_clear(&p1, 0);
string_list_clear(&p2, 0);
strbuf_release(&buffer1);
strbuf_release(&buffer2);

return ret;
} else {
struct diff_filespec *d1, *d2;

if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
unsigned tmp;
const char *tmp_c;
tmp = mode1; mode1 = mode2; mode2 = tmp;
tmp_c = name1; name1 = name2; name2 = tmp_c;
}

if (!name1)
name1 = "/dev/null";
if (!name2)
name2 = "/dev/null";
d1 = alloc_filespec(name1);
d2 = alloc_filespec(name2);
fill_filespec(d1, null_sha1, mode1);
fill_filespec(d2, null_sha1, mode2);

diff_queue(&diff_queued_diff, d1, d2);
return 0;
}
}

static int path_outside_repo(const char *path)
{
const char *work_tree;
size_t len;

if (!is_absolute_path(path))
return 0;
work_tree = get_git_work_tree();
if (!work_tree)
return 1;
len = strlen(work_tree);
if (strncmp(path, work_tree, len) ||
(path[len] != '\0' && path[len] != '/'))
return 1;
return 0;
}

void diff_no_index(struct rev_info *revs,
int argc, const char **argv,
int nongit, const char *prefix)
{
int i;
int no_index = 0;
unsigned options = 0;

/* Were we asked to do --no-index explicitly? */
for (i = 1; i < argc; i++) {
if (!strcmp(argv[i], "--")) {
i++;
break;
}
if (!strcmp(argv[i], "--no-index"))
no_index = 1;
if (argv[i][0] != '-')
break;
}

if (!no_index && !nongit) {
/*
* Inside a git repository, without --no-index. Only
* when a path outside the repository is given,
* e.g. "git diff /var/tmp/[12]", or "git diff
* Makefile /var/tmp/Makefile", allow it to be used as
* a colourful "diff" replacement.
*/
if ((argc != i + 2) ||
(!path_outside_repo(argv[i]) &&
!path_outside_repo(argv[i+1])))
return;
}
if (argc != i + 2)
usagef("git diff %s <path> <path>",
no_index ? "--no-index" : "[--no-index]");

diff_setup(&revs->diffopt);
for (i = 1; i < argc - 2; ) {
int j;
if (!strcmp(argv[i], "--no-index"))
i++;
else if (!strcmp(argv[i], "-q")) {
options |= DIFF_SILENT_ON_REMOVED;
i++;
}
else if (!strcmp(argv[i], "--"))
i++;
else {
j = diff_opt_parse(&revs->diffopt, argv + i, argc - i);
if (!j)
die("invalid diff option/value: %s", argv[i]);
i += j;
}
}

/*
* If the user asked for our exit code then don't start a
* pager or we would end up reporting its exit code instead.
*/
if (!DIFF_OPT_TST(&revs->diffopt, EXIT_WITH_STATUS))
setup_pager();

if (prefix) {
int len = strlen(prefix);
const char *paths[3];
memset(paths, 0, sizeof(paths));

for (i = 0; i < 2; i++) {
const char *p = argv[argc - 2 + i];
/*
* stdin should be spelled as '-'; if you have
* path that is '-', spell it as ./-.
*/
p = (strcmp(p, "-")
? xstrdup(prefix_filename(prefix, len, p))
: p);
paths[i] = p;
}
diff_tree_setup_paths(paths, &revs->diffopt);
}
else
diff_tree_setup_paths(argv + argc - 2, &revs->diffopt);
revs->diffopt.skip_stat_unmatch = 1;
if (!revs->diffopt.output_format)
revs->diffopt.output_format = DIFF_FORMAT_PATCH;

DIFF_OPT_SET(&revs->diffopt, EXIT_WITH_STATUS);
DIFF_OPT_SET(&revs->diffopt, NO_INDEX);

revs->max_count = -2;
if (diff_setup_done(&revs->diffopt) < 0)
die("diff_setup_done failed");

if (queue_diff(&revs->diffopt, revs->diffopt.pathspec.raw[0],
revs->diffopt.pathspec.raw[1]))
exit(1);
diff_set_mnemonic_prefix(&revs->diffopt, "1/", "2/");
diffcore_std(&revs->diffopt);
diff_flush(&revs->diffopt);

/*
* The return code for --no-index imitates diff(1):
* 0 = no changes, 1 = changes, else error
*/
exit(revs->diffopt.found_changes);
}
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