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/*
* This merges the file listing in the directory cache index
* with the actual working directory list, and shows different
* combinations of the two.
*
* Copyright (C) Linus Torvalds, 2005
*/
#include "cache.h"
#include "quote.h"
#include "dir.h"
#include "builtin.h"
#include "tree.h"

static int abbrev;
static int show_deleted;
static int show_cached;
static int show_others;
static int show_stage;
static int show_unmerged;
static int show_modified;
static int show_killed;
static int show_valid_bit;
static int line_terminator = '\n';

static int prefix_len;
static int prefix_offset;
static const char **pathspec;
static int error_unmatch;
static char *ps_matched;
static const char *with_tree;

static const char *tag_cached = "";
static const char *tag_unmerged = "";
static const char *tag_removed = "";
static const char *tag_other = "";
static const char *tag_killed = "";
static const char *tag_modified = "";


/*
* Match a pathspec against a filename. The first "skiplen" characters
* are the common prefix
*/
int pathspec_match(const char **spec, char *ps_matched,
const char *filename, int skiplen)
{
const char *m;

while ((m = *spec++) != NULL) {
int matchlen = strlen(m + skiplen);

if (!matchlen)
goto matched;
if (!strncmp(m + skiplen, filename + skiplen, matchlen)) {
if (m[skiplen + matchlen - 1] == '/')
goto matched;
switch (filename[skiplen + matchlen]) {
case '/': case '\0':
goto matched;
}
}
if (!fnmatch(m + skiplen, filename + skiplen, 0))
goto matched;
if (ps_matched)
ps_matched++;
continue;
matched:
if (ps_matched)
*ps_matched = 1;
return 1;
}
return 0;
}

static void show_dir_entry(const char *tag, struct dir_entry *ent)
{
int len = prefix_len;
int offset = prefix_offset;

if (len >= ent->len)
die("git-ls-files: internal error - directory entry not superset of prefix");

if (pathspec && !pathspec_match(pathspec, ps_matched, ent->name, len))
return;

fputs(tag, stdout);
write_name_quoted(ent->name + offset, stdout, line_terminator);
}

static void show_other_files(struct dir_struct *dir)
{
int i;


/*
* Skip matching and unmerged entries for the paths,
* since we want just "others".
*
* (Matching entries are normally pruned during
* the directory tree walk, but will show up for
* gitlinks because we don't necessarily have
* dir->show_other_directories set to suppress
* them).
*/
for (i = 0; i < dir->nr; i++) {
struct dir_entry *ent = dir->entries[i];
int len, pos;
struct cache_entry *ce;

/*
* Remove the '/' at the end that directory
* walking adds for directory entries.
*/
len = ent->len;
if (len && ent->name[len-1] == '/')
len--;
pos = cache_name_pos(ent->name, len);
if (0 <= pos)
continue; /* exact match */
pos = -pos - 1;
if (pos < active_nr) {
ce = active_cache[pos];
if (ce_namelen(ce) == len &&
!memcmp(ce->name, ent->name, len))
continue; /* Yup, this one exists unmerged */
}
show_dir_entry(tag_other, ent);
}
}

static void show_killed_files(struct dir_struct *dir)
{
int i;
for (i = 0; i < dir->nr; i++) {
struct dir_entry *ent = dir->entries[i];
char *cp, *sp;
int pos, len, killed = 0;

for (cp = ent->name; cp - ent->name < ent->len; cp = sp + 1) {
sp = strchr(cp, '/');
if (!sp) {
/* If ent->name is prefix of an entry in the
* cache, it will be killed.
*/
pos = cache_name_pos(ent->name, ent->len);
if (0 <= pos)
die("bug in show-killed-files");
pos = -pos - 1;
while (pos < active_nr &&
ce_stage(active_cache[pos]))
pos++; /* skip unmerged */
if (active_nr <= pos)
break;
/* pos points at a name immediately after
* ent->name in the cache. Does it expect
* ent->name to be a directory?
*/
len = ce_namelen(active_cache[pos]);
if ((ent->len < len) &&
!strncmp(active_cache[pos]->name,
ent->name, ent->len) &&
active_cache[pos]->name[ent->len] == '/')
killed = 1;
break;
}
if (0 <= cache_name_pos(ent->name, sp - ent->name)) {
/* If any of the leading directories in
* ent->name is registered in the cache,
* ent->name will be killed.
*/
killed = 1;
break;
}
}
if (killed)
show_dir_entry(tag_killed, dir->entries[i]);
}
}

static void show_ce_entry(const char *tag, struct cache_entry *ce)
{
int len = prefix_len;
int offset = prefix_offset;

if (len >= ce_namelen(ce))
die("git-ls-files: internal error - cache entry not superset of prefix");

if (pathspec && !pathspec_match(pathspec, ps_matched, ce->name, len))
return;

if (tag && *tag && show_valid_bit &&
(ce->ce_flags & CE_VALID)) {
static char alttag[4];
memcpy(alttag, tag, 3);
if (isalpha(tag[0]))
alttag[0] = tolower(tag[0]);
else if (tag[0] == '?')
alttag[0] = '!';
else {
alttag[0] = 'v';
alttag[1] = tag[0];
alttag[2] = ' ';
alttag[3] = 0;
}
tag = alttag;
}

if (!show_stage) {
fputs(tag, stdout);
} else {
printf("%s%06o %s %d\t",
tag,
ce->ce_mode,
abbrev ? find_unique_abbrev(ce->sha1,abbrev)
: sha1_to_hex(ce->sha1),
ce_stage(ce));
}
write_name_quoted(ce->name + offset, stdout, line_terminator);
}

static void show_files(struct dir_struct *dir, const char *prefix)
{
int i;

/* For cached/deleted files we don't need to even do the readdir */
if (show_others || show_killed) {
const char *path = ".", *base = "";
int baselen = prefix_len;

if (baselen)
path = base = prefix;
read_directory(dir, path, base, baselen, pathspec);
if (show_others)
show_other_files(dir);
if (show_killed)
show_killed_files(dir);
}
if (show_cached | show_stage) {
for (i = 0; i < active_nr; i++) {
struct cache_entry *ce = active_cache[i];
int dtype = ce_to_dtype(ce);
if (excluded(dir, ce->name, &dtype) != dir->show_ignored)
continue;
if (show_unmerged && !ce_stage(ce))
continue;
if (ce->ce_flags & CE_UPDATE)
continue;
show_ce_entry(ce_stage(ce) ? tag_unmerged : tag_cached, ce);
}
}
if (show_deleted | show_modified) {
for (i = 0; i < active_nr; i++) {
struct cache_entry *ce = active_cache[i];
struct stat st;
int err;
int dtype = ce_to_dtype(ce);
if (excluded(dir, ce->name, &dtype) != dir->show_ignored)
continue;
err = lstat(ce->name, &st);
if (show_deleted && err)
show_ce_entry(tag_removed, ce);
if (show_modified && ce_modified(ce, &st, 0))
show_ce_entry(tag_modified, ce);
}
}
}

/*
* Prune the index to only contain stuff starting with "prefix"
*/
static void prune_cache(const char *prefix)
{
int pos = cache_name_pos(prefix, prefix_len);
unsigned int first, last;

if (pos < 0)
pos = -pos-1;
memmove(active_cache, active_cache + pos,
(active_nr - pos) * sizeof(struct cache_entry *));
active_nr -= pos;
first = 0;
last = active_nr;
while (last > first) {
int next = (last + first) >> 1;
struct cache_entry *ce = active_cache[next];
if (!strncmp(ce->name, prefix, prefix_len)) {
first = next+1;
continue;
}
last = next;
}
active_nr = last;
}

static const char *verify_pathspec(const char *prefix)
{
const char **p, *n, *prev;
unsigned long max;

prev = NULL;
max = PATH_MAX;
for (p = pathspec; (n = *p) != NULL; p++) {
int i, len = 0;
for (i = 0; i < max; i++) {
char c = n[i];
if (prev && prev[i] != c)
break;
if (!c || c == '*' || c == '?')
break;
if (c == '/')
len = i+1;
}
prev = n;
if (len < max) {
max = len;
if (!max)
break;
}
}

if (prefix_offset > max || memcmp(prev, prefix, prefix_offset))
die("git-ls-files: cannot generate relative filenames containing '..'");

prefix_len = max;
return max ? xmemdupz(prev, max) : NULL;
}

/*
* Read the tree specified with --with-tree option
* (typically, HEAD) into stage #1 and then
* squash them down to stage #0. This is used for
* --error-unmatch to list and check the path patterns
* that were given from the command line. We are not
* going to write this index out.
*/
void overlay_tree_on_cache(const char *tree_name, const char *prefix)
{
struct tree *tree;
unsigned char sha1[20];
const char **match;
struct cache_entry *last_stage0 = NULL;
int i;

if (get_sha1(tree_name, sha1))
die("tree-ish %s not found.", tree_name);
tree = parse_tree_indirect(sha1);
if (!tree)
die("bad tree-ish %s", tree_name);

/* Hoist the unmerged entries up to stage #3 to make room */
for (i = 0; i < active_nr; i++) {
struct cache_entry *ce = active_cache[i];
if (!ce_stage(ce))
continue;
ce->ce_flags |= CE_STAGEMASK;
}

if (prefix) {
static const char *(matchbuf[2]);
matchbuf[0] = prefix;
matchbuf [1] = NULL;
match = matchbuf;
} else
match = NULL;
if (read_tree(tree, 1, match))
die("unable to read tree entries %s", tree_name);

for (i = 0; i < active_nr; i++) {
struct cache_entry *ce = active_cache[i];
switch (ce_stage(ce)) {
case 0:
last_stage0 = ce;
/* fallthru */
default:
continue;
case 1:
/*
* If there is stage #0 entry for this, we do not
* need to show it. We use CE_UPDATE bit to mark
* such an entry.
*/
if (last_stage0 &&
!strcmp(last_stage0->name, ce->name))
ce->ce_flags |= CE_UPDATE;
}
}
}

int report_path_error(const char *ps_matched, const char **pathspec, int prefix_offset)
{
/*
* Make sure all pathspec matched; otherwise it is an error.
*/
int num, errors = 0;
for (num = 0; pathspec[num]; num++) {
int other, found_dup;

if (ps_matched[num])
continue;
/*
* The caller might have fed identical pathspec
* twice. Do not barf on such a mistake.
*/
for (found_dup = other = 0;
!found_dup && pathspec[other];
other++) {
if (other == num || !ps_matched[other])
continue;
if (!strcmp(pathspec[other], pathspec[num]))
/*
* Ok, we have a match already.
*/
found_dup = 1;
}
if (found_dup)
continue;

error("pathspec '%s' did not match any file(s) known to git.",
pathspec[num] + prefix_offset);
errors++;
}
return errors;
}

static const char ls_files_usage[] =
"git-ls-files [-z] [-t] [-v] (--[cached|deleted|others|stage|unmerged|killed|modified])* "
"[ --ignored ] [--exclude=<pattern>] [--exclude-from=<file>] "
"[ --exclude-per-directory=<filename> ] [--exclude-standard] "
"[--full-name] [--abbrev] [--] [<file>]*";

int cmd_ls_files(int argc, const char **argv, const char *prefix)
{
int i;
int exc_given = 0, require_work_tree = 0;
struct dir_struct dir;

memset(&dir, 0, sizeof(dir));
if (prefix)
prefix_offset = strlen(prefix);
git_config(git_default_config);

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

if (!strcmp(arg, "--")) {
i++;
break;
}
if (!strcmp(arg, "-z")) {
line_terminator = 0;
continue;
}
if (!strcmp(arg, "-t") || !strcmp(arg, "-v")) {
tag_cached = "H ";
tag_unmerged = "M ";
tag_removed = "R ";
tag_modified = "C ";
tag_other = "? ";
tag_killed = "K ";
if (arg[1] == 'v')
show_valid_bit = 1;
continue;
}
if (!strcmp(arg, "-c") || !strcmp(arg, "--cached")) {
show_cached = 1;
continue;
}
if (!strcmp(arg, "-d") || !strcmp(arg, "--deleted")) {
show_deleted = 1;
continue;
}
if (!strcmp(arg, "-m") || !strcmp(arg, "--modified")) {
show_modified = 1;
require_work_tree = 1;
continue;
}
if (!strcmp(arg, "-o") || !strcmp(arg, "--others")) {
show_others = 1;
require_work_tree = 1;
continue;
}
if (!strcmp(arg, "-i") || !strcmp(arg, "--ignored")) {
dir.show_ignored = 1;
require_work_tree = 1;
continue;
}
if (!strcmp(arg, "-s") || !strcmp(arg, "--stage")) {
show_stage = 1;
continue;
}
if (!strcmp(arg, "-k") || !strcmp(arg, "--killed")) {
show_killed = 1;
require_work_tree = 1;
continue;
}
if (!strcmp(arg, "--directory")) {
dir.show_other_directories = 1;
continue;
}
if (!strcmp(arg, "--no-empty-directory")) {
dir.hide_empty_directories = 1;
continue;
}
if (!strcmp(arg, "-u") || !strcmp(arg, "--unmerged")) {
/* There's no point in showing unmerged unless
* you also show the stage information.
*/
show_stage = 1;
show_unmerged = 1;
continue;
}
if (!strcmp(arg, "-x") && i+1 < argc) {
exc_given = 1;
add_exclude(argv[++i], "", 0, &dir.exclude_list[EXC_CMDL]);
continue;
}
if (!prefixcmp(arg, "--exclude=")) {
exc_given = 1;
add_exclude(arg+10, "", 0, &dir.exclude_list[EXC_CMDL]);
continue;
}
if (!strcmp(arg, "-X") && i+1 < argc) {
exc_given = 1;
add_excludes_from_file(&dir, argv[++i]);
continue;
}
if (!prefixcmp(arg, "--exclude-from=")) {
exc_given = 1;
add_excludes_from_file(&dir, arg+15);
continue;
}
if (!prefixcmp(arg, "--exclude-per-directory=")) {
exc_given = 1;
dir.exclude_per_dir = arg + 24;
continue;
}
if (!strcmp(arg, "--exclude-standard")) {
exc_given = 1;
setup_standard_excludes(&dir);
continue;
}
if (!strcmp(arg, "--full-name")) {
prefix_offset = 0;
continue;
}
if (!strcmp(arg, "--error-unmatch")) {
error_unmatch = 1;
continue;
}
if (!prefixcmp(arg, "--with-tree=")) {
with_tree = arg + 12;
continue;
}
if (!prefixcmp(arg, "--abbrev=")) {
abbrev = strtoul(arg+9, NULL, 10);
if (abbrev && abbrev < MINIMUM_ABBREV)
abbrev = MINIMUM_ABBREV;
else if (abbrev > 40)
abbrev = 40;
continue;
}
if (!strcmp(arg, "--abbrev")) {
abbrev = DEFAULT_ABBREV;
continue;
}
if (*arg == '-')
usage(ls_files_usage);
break;
}

if (require_work_tree && !is_inside_work_tree())
setup_work_tree();

pathspec = get_pathspec(prefix, argv + i);

/* Verify that the pathspec matches the prefix */
if (pathspec)
prefix = verify_pathspec(prefix);

/* Treat unmatching pathspec elements as errors */
if (pathspec && error_unmatch) {
int num;
for (num = 0; pathspec[num]; num++)
;
ps_matched = xcalloc(1, num);
}

if (dir.show_ignored && !exc_given) {
fprintf(stderr, "%s: --ignored needs some exclude pattern\n",
argv[0]);
exit(1);
}

/* With no flags, we default to showing the cached files */
if (!(show_stage | show_deleted | show_others | show_unmerged |
show_killed | show_modified))
show_cached = 1;

read_cache();
if (prefix)
prune_cache(prefix);
if (with_tree) {
/*
* Basic sanity check; show-stages and show-unmerged
* would not make any sense with this option.
*/
if (show_stage || show_unmerged)
die("ls-files --with-tree is incompatible with -s or -u");
overlay_tree_on_cache(with_tree, prefix);
}
show_files(&dir, prefix);

if (ps_matched) {
int bad;
bad = report_path_error(ps_matched, pathspec, prefix_offset);
if (bad)
fprintf(stderr, "Did you forget to 'git add'?\n");

return bad ? 1 : 0;
}

return 0;
}
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