git/builtin-grep.c
Junio C Hamano 050dfc4535 Merge branch 'maint-1.6.4' into maint
* maint-1.6.4:
  grep: do not segfault when -f is used
2009-10-16 23:47:58 -07:00

888 lines
23 KiB
C

/*
* Builtin "git grep"
*
* Copyright (c) 2006 Junio C Hamano
*/
#include "cache.h"
#include "blob.h"
#include "tree.h"
#include "commit.h"
#include "tag.h"
#include "tree-walk.h"
#include "builtin.h"
#include "parse-options.h"
#include "userdiff.h"
#include "grep.h"
#include "quote.h"
#ifndef NO_EXTERNAL_GREP
#ifdef __unix__
#define NO_EXTERNAL_GREP 0
#else
#define NO_EXTERNAL_GREP 1
#endif
#endif
static char const * const grep_usage[] = {
"git grep [options] [-e] <pattern> [<rev>...] [[--] path...]",
NULL
};
static int grep_config(const char *var, const char *value, void *cb)
{
struct grep_opt *opt = cb;
switch (userdiff_config(var, value)) {
case 0: break;
case -1: return -1;
default: return 0;
}
if (!strcmp(var, "color.grep")) {
opt->color = git_config_colorbool(var, value, -1);
return 0;
}
if (!strcmp(var, "color.grep.external"))
return git_config_string(&(opt->color_external), var, value);
if (!strcmp(var, "color.grep.match")) {
if (!value)
return config_error_nonbool(var);
color_parse(value, var, opt->color_match);
return 0;
}
return git_color_default_config(var, value, cb);
}
/*
* Return non-zero if max_depth is negative or path has no more then max_depth
* slashes.
*/
static int accept_subdir(const char *path, int max_depth)
{
if (max_depth < 0)
return 1;
while ((path = strchr(path, '/')) != NULL) {
max_depth--;
if (max_depth < 0)
return 0;
path++;
}
return 1;
}
/*
* Return non-zero if name is a subdirectory of match and is not too deep.
*/
static int is_subdir(const char *name, int namelen,
const char *match, int matchlen, int max_depth)
{
if (matchlen > namelen || strncmp(name, match, matchlen))
return 0;
if (name[matchlen] == '\0') /* exact match */
return 1;
if (!matchlen || match[matchlen-1] == '/' || name[matchlen] == '/')
return accept_subdir(name + matchlen + 1, max_depth);
return 0;
}
/*
* git grep pathspecs are somewhat different from diff-tree pathspecs;
* pathname wildcards are allowed.
*/
static int pathspec_matches(const char **paths, const char *name, int max_depth)
{
int namelen, i;
if (!paths || !*paths)
return accept_subdir(name, max_depth);
namelen = strlen(name);
for (i = 0; paths[i]; i++) {
const char *match = paths[i];
int matchlen = strlen(match);
const char *cp, *meta;
if (is_subdir(name, namelen, match, matchlen, max_depth))
return 1;
if (!fnmatch(match, name, 0))
return 1;
if (name[namelen-1] != '/')
continue;
/* We are being asked if the directory ("name") is worth
* descending into.
*
* Find the longest leading directory name that does
* not have metacharacter in the pathspec; the name
* we are looking at must overlap with that directory.
*/
for (cp = match, meta = NULL; cp - match < matchlen; cp++) {
char ch = *cp;
if (ch == '*' || ch == '[' || ch == '?') {
meta = cp;
break;
}
}
if (!meta)
meta = cp; /* fully literal */
if (namelen <= meta - match) {
/* Looking at "Documentation/" and
* the pattern says "Documentation/howto/", or
* "Documentation/diff*.txt". The name we
* have should match prefix.
*/
if (!memcmp(match, name, namelen))
return 1;
continue;
}
if (meta - match < namelen) {
/* Looking at "Documentation/howto/" and
* the pattern says "Documentation/h*";
* match up to "Do.../h"; this avoids descending
* into "Documentation/technical/".
*/
if (!memcmp(match, name, meta - match))
return 1;
continue;
}
}
return 0;
}
static int grep_sha1(struct grep_opt *opt, const unsigned char *sha1, const char *name, int tree_name_len)
{
unsigned long size;
char *data;
enum object_type type;
int hit;
struct strbuf pathbuf = STRBUF_INIT;
data = read_sha1_file(sha1, &type, &size);
if (!data) {
error("'%s': unable to read %s", name, sha1_to_hex(sha1));
return 0;
}
if (opt->relative && opt->prefix_length) {
quote_path_relative(name + tree_name_len, -1, &pathbuf, opt->prefix);
strbuf_insert(&pathbuf, 0, name, tree_name_len);
name = pathbuf.buf;
}
hit = grep_buffer(opt, name, data, size);
strbuf_release(&pathbuf);
free(data);
return hit;
}
static int grep_file(struct grep_opt *opt, const char *filename)
{
struct stat st;
int i;
char *data;
size_t sz;
struct strbuf buf = STRBUF_INIT;
if (lstat(filename, &st) < 0) {
err_ret:
if (errno != ENOENT)
error("'%s': %s", filename, strerror(errno));
return 0;
}
if (!st.st_size)
return 0; /* empty file -- no grep hit */
if (!S_ISREG(st.st_mode))
return 0;
sz = xsize_t(st.st_size);
i = open(filename, O_RDONLY);
if (i < 0)
goto err_ret;
data = xmalloc(sz + 1);
if (st.st_size != read_in_full(i, data, sz)) {
error("'%s': short read %s", filename, strerror(errno));
close(i);
free(data);
return 0;
}
close(i);
if (opt->relative && opt->prefix_length)
filename = quote_path_relative(filename, -1, &buf, opt->prefix);
i = grep_buffer(opt, filename, data, sz);
strbuf_release(&buf);
free(data);
return i;
}
#if !NO_EXTERNAL_GREP
static int exec_grep(int argc, const char **argv)
{
pid_t pid;
int status;
argv[argc] = NULL;
pid = fork();
if (pid < 0)
return pid;
if (!pid) {
execvp("grep", (char **) argv);
exit(255);
}
while (waitpid(pid, &status, 0) < 0) {
if (errno == EINTR)
continue;
return -1;
}
if (WIFEXITED(status)) {
if (!WEXITSTATUS(status))
return 1;
return 0;
}
return -1;
}
#define MAXARGS 1000
#define ARGBUF 4096
#define push_arg(a) do { \
if (nr < MAXARGS) argv[nr++] = (a); \
else die("maximum number of args exceeded"); \
} while (0)
/*
* If you send a singleton filename to grep, it does not give
* the name of the file. GNU grep has "-H" but we would want
* that behaviour in a portable way.
*
* So we keep two pathnames in argv buffer unsent to grep in
* the main loop if we need to do more than one grep.
*/
static int flush_grep(struct grep_opt *opt,
int argc, int arg0, const char **argv, int *kept)
{
int status;
int count = argc - arg0;
const char *kept_0 = NULL;
if (count <= 2) {
/*
* Because we keep at least 2 paths in the call from
* the main loop (i.e. kept != NULL), and MAXARGS is
* far greater than 2, this usually is a call to
* conclude the grep. However, the user could attempt
* to overflow the argv buffer by giving too many
* options to leave very small number of real
* arguments even for the call in the main loop.
*/
if (kept)
die("insanely many options to grep");
/*
* If we have two or more paths, we do not have to do
* anything special, but we need to push /dev/null to
* get "-H" behaviour of GNU grep portably but when we
* are not doing "-l" nor "-L" nor "-c".
*/
if (count == 1 &&
!opt->name_only &&
!opt->unmatch_name_only &&
!opt->count) {
argv[argc++] = "/dev/null";
argv[argc] = NULL;
}
}
else if (kept) {
/*
* Called because we found many paths and haven't finished
* iterating over the cache yet. We keep two paths
* for the concluding call. argv[argc-2] and argv[argc-1]
* has the last two paths, so save the first one away,
* replace it with NULL while sending the list to grep,
* and recover them after we are done.
*/
*kept = 2;
kept_0 = argv[argc-2];
argv[argc-2] = NULL;
argc -= 2;
}
if (opt->pre_context || opt->post_context) {
/*
* grep handles hunk marks between files, but we need to
* do that ourselves between multiple calls.
*/
if (opt->show_hunk_mark)
write_or_die(1, "--\n", 3);
else
opt->show_hunk_mark = 1;
}
status = exec_grep(argc, argv);
if (kept_0) {
/*
* Then recover them. Now the last arg is beyond the
* terminating NULL which is at argc, and the second
* from the last is what we saved away in kept_0
*/
argv[arg0++] = kept_0;
argv[arg0] = argv[argc+1];
}
return status;
}
static void grep_add_color(struct strbuf *sb, const char *escape_seq)
{
size_t orig_len = sb->len;
while (*escape_seq) {
if (*escape_seq == 'm')
strbuf_addch(sb, ';');
else if (*escape_seq != '\033' && *escape_seq != '[')
strbuf_addch(sb, *escape_seq);
escape_seq++;
}
if (sb->len > orig_len && sb->buf[sb->len - 1] == ';')
strbuf_setlen(sb, sb->len - 1);
}
static int external_grep(struct grep_opt *opt, const char **paths, int cached)
{
int i, nr, argc, hit, len, status;
const char *argv[MAXARGS+1];
char randarg[ARGBUF];
char *argptr = randarg;
struct grep_pat *p;
if (opt->extended || (opt->relative && opt->prefix_length))
return -1;
len = nr = 0;
push_arg("grep");
if (opt->fixed)
push_arg("-F");
if (opt->linenum)
push_arg("-n");
if (!opt->pathname)
push_arg("-h");
if (opt->regflags & REG_EXTENDED)
push_arg("-E");
if (opt->regflags & REG_ICASE)
push_arg("-i");
if (opt->binary == GREP_BINARY_NOMATCH)
push_arg("-I");
if (opt->word_regexp)
push_arg("-w");
if (opt->name_only)
push_arg("-l");
if (opt->unmatch_name_only)
push_arg("-L");
if (opt->null_following_name)
/* in GNU grep git's "-z" translates to "-Z" */
push_arg("-Z");
if (opt->count)
push_arg("-c");
if (opt->post_context || opt->pre_context) {
if (opt->post_context != opt->pre_context) {
if (opt->pre_context) {
push_arg("-B");
len += snprintf(argptr, sizeof(randarg)-len,
"%u", opt->pre_context) + 1;
if (sizeof(randarg) <= len)
die("maximum length of args exceeded");
push_arg(argptr);
argptr += len;
}
if (opt->post_context) {
push_arg("-A");
len += snprintf(argptr, sizeof(randarg)-len,
"%u", opt->post_context) + 1;
if (sizeof(randarg) <= len)
die("maximum length of args exceeded");
push_arg(argptr);
argptr += len;
}
}
else {
push_arg("-C");
len += snprintf(argptr, sizeof(randarg)-len,
"%u", opt->post_context) + 1;
if (sizeof(randarg) <= len)
die("maximum length of args exceeded");
push_arg(argptr);
argptr += len;
}
}
for (p = opt->pattern_list; p; p = p->next) {
push_arg("-e");
push_arg(p->pattern);
}
if (opt->color) {
struct strbuf sb = STRBUF_INIT;
grep_add_color(&sb, opt->color_match);
setenv("GREP_COLOR", sb.buf, 1);
strbuf_reset(&sb);
strbuf_addstr(&sb, "mt=");
grep_add_color(&sb, opt->color_match);
strbuf_addstr(&sb, ":sl=:cx=:fn=:ln=:bn=:se=");
setenv("GREP_COLORS", sb.buf, 1);
strbuf_release(&sb);
if (opt->color_external && strlen(opt->color_external) > 0)
push_arg(opt->color_external);
}
hit = 0;
argc = nr;
for (i = 0; i < active_nr; i++) {
struct cache_entry *ce = active_cache[i];
char *name;
int kept;
if (!S_ISREG(ce->ce_mode))
continue;
if (!pathspec_matches(paths, ce->name, opt->max_depth))
continue;
name = ce->name;
if (name[0] == '-') {
int len = ce_namelen(ce);
name = xmalloc(len + 3);
memcpy(name, "./", 2);
memcpy(name + 2, ce->name, len + 1);
}
argv[argc++] = name;
if (MAXARGS <= argc) {
status = flush_grep(opt, argc, nr, argv, &kept);
if (0 < status)
hit = 1;
argc = nr + kept;
}
if (ce_stage(ce)) {
do {
i++;
} while (i < active_nr &&
!strcmp(ce->name, active_cache[i]->name));
i--; /* compensate for loop control */
}
}
if (argc > nr) {
status = flush_grep(opt, argc, nr, argv, NULL);
if (0 < status)
hit = 1;
}
return hit;
}
#endif
static int grep_cache(struct grep_opt *opt, const char **paths, int cached,
int external_grep_allowed)
{
int hit = 0;
int nr;
read_cache();
#if !NO_EXTERNAL_GREP
/*
* Use the external "grep" command for the case where
* we grep through the checked-out files. It tends to
* be a lot more optimized
*/
if (!cached && external_grep_allowed) {
hit = external_grep(opt, paths, cached);
if (hit >= 0)
return hit;
hit = 0;
}
#endif
for (nr = 0; nr < active_nr; nr++) {
struct cache_entry *ce = active_cache[nr];
if (!S_ISREG(ce->ce_mode))
continue;
if (!pathspec_matches(paths, ce->name, opt->max_depth))
continue;
/*
* If CE_VALID is on, we assume worktree file and its cache entry
* are identical, even if worktree file has been modified, so use
* cache version instead
*/
if (cached || (ce->ce_flags & CE_VALID)) {
if (ce_stage(ce))
continue;
hit |= grep_sha1(opt, ce->sha1, ce->name, 0);
}
else
hit |= grep_file(opt, ce->name);
if (ce_stage(ce)) {
do {
nr++;
} while (nr < active_nr &&
!strcmp(ce->name, active_cache[nr]->name));
nr--; /* compensate for loop control */
}
}
free_grep_patterns(opt);
return hit;
}
static int grep_tree(struct grep_opt *opt, const char **paths,
struct tree_desc *tree,
const char *tree_name, const char *base)
{
int len;
int hit = 0;
struct name_entry entry;
char *down;
int tn_len = strlen(tree_name);
struct strbuf pathbuf;
strbuf_init(&pathbuf, PATH_MAX + tn_len);
if (tn_len) {
strbuf_add(&pathbuf, tree_name, tn_len);
strbuf_addch(&pathbuf, ':');
tn_len = pathbuf.len;
}
strbuf_addstr(&pathbuf, base);
len = pathbuf.len;
while (tree_entry(tree, &entry)) {
int te_len = tree_entry_len(entry.path, entry.sha1);
pathbuf.len = len;
strbuf_add(&pathbuf, entry.path, te_len);
if (S_ISDIR(entry.mode))
/* Match "abc/" against pathspec to
* decide if we want to descend into "abc"
* directory.
*/
strbuf_addch(&pathbuf, '/');
down = pathbuf.buf + tn_len;
if (!pathspec_matches(paths, down, opt->max_depth))
;
else if (S_ISREG(entry.mode))
hit |= grep_sha1(opt, entry.sha1, pathbuf.buf, tn_len);
else if (S_ISDIR(entry.mode)) {
enum object_type type;
struct tree_desc sub;
void *data;
unsigned long size;
data = read_sha1_file(entry.sha1, &type, &size);
if (!data)
die("unable to read tree (%s)",
sha1_to_hex(entry.sha1));
init_tree_desc(&sub, data, size);
hit |= grep_tree(opt, paths, &sub, tree_name, down);
free(data);
}
}
strbuf_release(&pathbuf);
return hit;
}
static int grep_object(struct grep_opt *opt, const char **paths,
struct object *obj, const char *name)
{
if (obj->type == OBJ_BLOB)
return grep_sha1(opt, obj->sha1, name, 0);
if (obj->type == OBJ_COMMIT || obj->type == OBJ_TREE) {
struct tree_desc tree;
void *data;
unsigned long size;
int hit;
data = read_object_with_reference(obj->sha1, tree_type,
&size, NULL);
if (!data)
die("unable to read tree (%s)", sha1_to_hex(obj->sha1));
init_tree_desc(&tree, data, size);
hit = grep_tree(opt, paths, &tree, name, "");
free(data);
return hit;
}
die("unable to grep from object of type %s", typename(obj->type));
}
static int context_callback(const struct option *opt, const char *arg,
int unset)
{
struct grep_opt *grep_opt = opt->value;
int value;
const char *endp;
if (unset) {
grep_opt->pre_context = grep_opt->post_context = 0;
return 0;
}
value = strtol(arg, (char **)&endp, 10);
if (*endp) {
return error("switch `%c' expects a numerical value",
opt->short_name);
}
grep_opt->pre_context = grep_opt->post_context = value;
return 0;
}
static int file_callback(const struct option *opt, const char *arg, int unset)
{
struct grep_opt *grep_opt = opt->value;
FILE *patterns;
int lno = 0;
struct strbuf sb = STRBUF_INIT;
patterns = fopen(arg, "r");
if (!patterns)
die_errno("cannot open '%s'", arg);
while (strbuf_getline(&sb, patterns, '\n') == 0) {
/* ignore empty line like grep does */
if (sb.len == 0)
continue;
append_grep_pattern(grep_opt, strbuf_detach(&sb, NULL), arg,
++lno, GREP_PATTERN);
}
fclose(patterns);
strbuf_release(&sb);
return 0;
}
static int not_callback(const struct option *opt, const char *arg, int unset)
{
struct grep_opt *grep_opt = opt->value;
append_grep_pattern(grep_opt, "--not", "command line", 0, GREP_NOT);
return 0;
}
static int and_callback(const struct option *opt, const char *arg, int unset)
{
struct grep_opt *grep_opt = opt->value;
append_grep_pattern(grep_opt, "--and", "command line", 0, GREP_AND);
return 0;
}
static int open_callback(const struct option *opt, const char *arg, int unset)
{
struct grep_opt *grep_opt = opt->value;
append_grep_pattern(grep_opt, "(", "command line", 0, GREP_OPEN_PAREN);
return 0;
}
static int close_callback(const struct option *opt, const char *arg, int unset)
{
struct grep_opt *grep_opt = opt->value;
append_grep_pattern(grep_opt, ")", "command line", 0, GREP_CLOSE_PAREN);
return 0;
}
static int pattern_callback(const struct option *opt, const char *arg,
int unset)
{
struct grep_opt *grep_opt = opt->value;
append_grep_pattern(grep_opt, arg, "-e option", 0, GREP_PATTERN);
return 0;
}
static int help_callback(const struct option *opt, const char *arg, int unset)
{
return -1;
}
int cmd_grep(int argc, const char **argv, const char *prefix)
{
int hit = 0;
int cached = 0;
int external_grep_allowed = 1;
int seen_dashdash = 0;
struct grep_opt opt;
struct object_array list = { 0, 0, NULL };
const char **paths = NULL;
int i;
int dummy;
struct option options[] = {
OPT_BOOLEAN(0, "cached", &cached,
"search in index instead of in the work tree"),
OPT_GROUP(""),
OPT_BOOLEAN('v', "invert-match", &opt.invert,
"show non-matching lines"),
OPT_BIT('i', "ignore-case", &opt.regflags,
"case insensitive matching", REG_ICASE),
OPT_BOOLEAN('w', "word-regexp", &opt.word_regexp,
"match patterns only at word boundaries"),
OPT_SET_INT('a', "text", &opt.binary,
"process binary files as text", GREP_BINARY_TEXT),
OPT_SET_INT('I', NULL, &opt.binary,
"don't match patterns in binary files",
GREP_BINARY_NOMATCH),
{ OPTION_INTEGER, 0, "max-depth", &opt.max_depth, "depth",
"descend at most <depth> levels", PARSE_OPT_NONEG,
NULL, 1 },
OPT_GROUP(""),
OPT_BIT('E', "extended-regexp", &opt.regflags,
"use extended POSIX regular expressions", REG_EXTENDED),
OPT_NEGBIT('G', "basic-regexp", &opt.regflags,
"use basic POSIX regular expressions (default)",
REG_EXTENDED),
OPT_BOOLEAN('F', "fixed-strings", &opt.fixed,
"interpret patterns as fixed strings"),
OPT_GROUP(""),
OPT_BOOLEAN('n', NULL, &opt.linenum, "show line numbers"),
OPT_NEGBIT('h', NULL, &opt.pathname, "don't show filenames", 1),
OPT_BIT('H', NULL, &opt.pathname, "show filenames", 1),
OPT_NEGBIT(0, "full-name", &opt.relative,
"show filenames relative to top directory", 1),
OPT_BOOLEAN('l', "files-with-matches", &opt.name_only,
"show only filenames instead of matching lines"),
OPT_BOOLEAN(0, "name-only", &opt.name_only,
"synonym for --files-with-matches"),
OPT_BOOLEAN('L', "files-without-match",
&opt.unmatch_name_only,
"show only the names of files without match"),
OPT_BOOLEAN('z', "null", &opt.null_following_name,
"print NUL after filenames"),
OPT_BOOLEAN('c', "count", &opt.count,
"show the number of matches instead of matching lines"),
OPT_SET_INT(0, "color", &opt.color, "highlight matches", 1),
OPT_GROUP(""),
OPT_CALLBACK('C', NULL, &opt, "n",
"show <n> context lines before and after matches",
context_callback),
OPT_INTEGER('B', NULL, &opt.pre_context,
"show <n> context lines before matches"),
OPT_INTEGER('A', NULL, &opt.post_context,
"show <n> context lines after matches"),
OPT_NUMBER_CALLBACK(&opt, "shortcut for -C NUM",
context_callback),
OPT_BOOLEAN('p', "show-function", &opt.funcname,
"show a line with the function name before matches"),
OPT_GROUP(""),
OPT_CALLBACK('f', NULL, &opt, "file",
"read patterns from file", file_callback),
{ OPTION_CALLBACK, 'e', NULL, &opt, "pattern",
"match <pattern>", PARSE_OPT_NONEG, pattern_callback },
{ OPTION_CALLBACK, 0, "and", &opt, NULL,
"combine patterns specified with -e",
PARSE_OPT_NOARG | PARSE_OPT_NONEG, and_callback },
OPT_BOOLEAN(0, "or", &dummy, ""),
{ OPTION_CALLBACK, 0, "not", &opt, NULL, "",
PARSE_OPT_NOARG | PARSE_OPT_NONEG, not_callback },
{ OPTION_CALLBACK, '(', NULL, &opt, NULL, "",
PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_NODASH,
open_callback },
{ OPTION_CALLBACK, ')', NULL, &opt, NULL, "",
PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_NODASH,
close_callback },
OPT_BOOLEAN(0, "all-match", &opt.all_match,
"show only matches from files that match all patterns"),
OPT_GROUP(""),
#if NO_EXTERNAL_GREP
OPT_BOOLEAN(0, "ext-grep", &external_grep_allowed,
"allow calling of grep(1) (ignored by this build)"),
#else
OPT_BOOLEAN(0, "ext-grep", &external_grep_allowed,
"allow calling of grep(1) (default)"),
#endif
{ OPTION_CALLBACK, 0, "help-all", &options, NULL, "show usage",
PARSE_OPT_HIDDEN | PARSE_OPT_NOARG, help_callback },
OPT_END()
};
memset(&opt, 0, sizeof(opt));
opt.prefix = prefix;
opt.prefix_length = (prefix && *prefix) ? strlen(prefix) : 0;
opt.relative = 1;
opt.pathname = 1;
opt.pattern_tail = &opt.pattern_list;
opt.regflags = REG_NEWLINE;
opt.max_depth = -1;
strcpy(opt.color_match, GIT_COLOR_RED GIT_COLOR_BOLD);
opt.color = -1;
git_config(grep_config, &opt);
if (opt.color == -1)
opt.color = git_use_color_default;
/*
* If there is no -- then the paths must exist in the working
* tree. If there is no explicit pattern specified with -e or
* -f, we take the first unrecognized non option to be the
* pattern, but then what follows it must be zero or more
* valid refs up to the -- (if exists), and then existing
* paths. If there is an explicit pattern, then the first
* unrecognized non option is the beginning of the refs list
* that continues up to the -- (if exists), and then paths.
*/
argc = parse_options(argc, argv, prefix, options, grep_usage,
PARSE_OPT_KEEP_DASHDASH |
PARSE_OPT_STOP_AT_NON_OPTION |
PARSE_OPT_NO_INTERNAL_HELP);
/* First unrecognized non-option token */
if (argc > 0 && !opt.pattern_list) {
append_grep_pattern(&opt, argv[0], "command line", 0,
GREP_PATTERN);
argv++;
argc--;
}
if ((opt.color && !opt.color_external) || opt.funcname)
external_grep_allowed = 0;
if (!opt.pattern_list)
die("no pattern given.");
if ((opt.regflags != REG_NEWLINE) && opt.fixed)
die("cannot mix --fixed-strings and regexp");
compile_grep_patterns(&opt);
/* Check revs and then paths */
for (i = 0; i < argc; i++) {
const char *arg = argv[i];
unsigned char sha1[20];
/* Is it a rev? */
if (!get_sha1(arg, sha1)) {
struct object *object = parse_object(sha1);
if (!object)
die("bad object %s", arg);
add_object_array(object, arg, &list);
continue;
}
if (!strcmp(arg, "--")) {
i++;
seen_dashdash = 1;
}
break;
}
/* The rest are paths */
if (!seen_dashdash) {
int j;
for (j = i; j < argc; j++)
verify_filename(prefix, argv[j]);
}
if (i < argc)
paths = get_pathspec(prefix, argv + i);
else if (prefix) {
paths = xcalloc(2, sizeof(const char *));
paths[0] = prefix;
paths[1] = NULL;
}
if (!list.nr) {
if (!cached)
setup_work_tree();
return !grep_cache(&opt, paths, cached, external_grep_allowed);
}
if (cached)
die("both --cached and trees are given.");
for (i = 0; i < list.nr; i++) {
struct object *real_obj;
real_obj = deref_tag(list.objects[i].item, NULL, 0);
if (grep_object(&opt, paths, real_obj, list.objects[i].name))
hit = 1;
}
free_grep_patterns(&opt);
return !hit;
}