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-rw-r--r--builtin/grep.c1058
1 files changed, 1058 insertions, 0 deletions
diff --git a/builtin/grep.c b/builtin/grep.c
new file mode 100644
index 0000000..871afaa
--- /dev/null
+++ b/builtin/grep.c
@@ -0,0 +1,1058 @@
+/*
+ * 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 "string-list.h"
+#include "run-command.h"
+#include "userdiff.h"
+#include "grep.h"
+#include "quote.h"
+#include "dir.h"
+#include "thread-utils.h"
+
+static char const * const grep_usage[] = {
+ "git grep [options] [-e] <pattern> [<rev>...] [[--] <path>...]",
+ NULL
+};
+
+static int use_threads = 1;
+
+#ifndef NO_PTHREADS
+#define THREADS 8
+static pthread_t threads[THREADS];
+
+static void *load_sha1(const unsigned char *sha1, unsigned long *size,
+ const char *name);
+static void *load_file(const char *filename, size_t *sz);
+
+enum work_type {WORK_SHA1, WORK_FILE};
+
+/* We use one producer thread and THREADS consumer
+ * threads. The producer adds struct work_items to 'todo' and the
+ * consumers pick work items from the same array.
+ */
+struct work_item {
+ enum work_type type;
+ char *name;
+
+ /* if type == WORK_SHA1, then 'identifier' is a SHA1,
+ * otherwise type == WORK_FILE, and 'identifier' is a NUL
+ * terminated filename.
+ */
+ void *identifier;
+ char done;
+ struct strbuf out;
+};
+
+/* In the range [todo_done, todo_start) in 'todo' we have work_items
+ * that have been or are processed by a consumer thread. We haven't
+ * written the result for these to stdout yet.
+ *
+ * The work_items in [todo_start, todo_end) are waiting to be picked
+ * up by a consumer thread.
+ *
+ * The ranges are modulo TODO_SIZE.
+ */
+#define TODO_SIZE 128
+static struct work_item todo[TODO_SIZE];
+static int todo_start;
+static int todo_end;
+static int todo_done;
+
+/* Has all work items been added? */
+static int all_work_added;
+
+/* This lock protects all the variables above. */
+static pthread_mutex_t grep_mutex;
+
+/* Used to serialize calls to read_sha1_file. */
+static pthread_mutex_t read_sha1_mutex;
+
+#define grep_lock() pthread_mutex_lock(&grep_mutex)
+#define grep_unlock() pthread_mutex_unlock(&grep_mutex)
+#define read_sha1_lock() pthread_mutex_lock(&read_sha1_mutex)
+#define read_sha1_unlock() pthread_mutex_unlock(&read_sha1_mutex)
+
+/* Signalled when a new work_item is added to todo. */
+static pthread_cond_t cond_add;
+
+/* Signalled when the result from one work_item is written to
+ * stdout.
+ */
+static pthread_cond_t cond_write;
+
+/* Signalled when we are finished with everything. */
+static pthread_cond_t cond_result;
+
+static int print_hunk_marks_between_files;
+static int printed_something;
+
+static void add_work(enum work_type type, char *name, void *id)
+{
+ grep_lock();
+
+ while ((todo_end+1) % ARRAY_SIZE(todo) == todo_done) {
+ pthread_cond_wait(&cond_write, &grep_mutex);
+ }
+
+ todo[todo_end].type = type;
+ todo[todo_end].name = name;
+ todo[todo_end].identifier = id;
+ todo[todo_end].done = 0;
+ strbuf_reset(&todo[todo_end].out);
+ todo_end = (todo_end + 1) % ARRAY_SIZE(todo);
+
+ pthread_cond_signal(&cond_add);
+ grep_unlock();
+}
+
+static struct work_item *get_work(void)
+{
+ struct work_item *ret;
+
+ grep_lock();
+ while (todo_start == todo_end && !all_work_added) {
+ pthread_cond_wait(&cond_add, &grep_mutex);
+ }
+
+ if (todo_start == todo_end && all_work_added) {
+ ret = NULL;
+ } else {
+ ret = &todo[todo_start];
+ todo_start = (todo_start + 1) % ARRAY_SIZE(todo);
+ }
+ grep_unlock();
+ return ret;
+}
+
+static void grep_sha1_async(struct grep_opt *opt, char *name,
+ const unsigned char *sha1)
+{
+ unsigned char *s;
+ s = xmalloc(20);
+ memcpy(s, sha1, 20);
+ add_work(WORK_SHA1, name, s);
+}
+
+static void grep_file_async(struct grep_opt *opt, char *name,
+ const char *filename)
+{
+ add_work(WORK_FILE, name, xstrdup(filename));
+}
+
+static void work_done(struct work_item *w)
+{
+ int old_done;
+
+ grep_lock();
+ w->done = 1;
+ old_done = todo_done;
+ for(; todo[todo_done].done && todo_done != todo_start;
+ todo_done = (todo_done+1) % ARRAY_SIZE(todo)) {
+ w = &todo[todo_done];
+ if (w->out.len) {
+ if (print_hunk_marks_between_files && printed_something)
+ write_or_die(1, "--\n", 3);
+ write_or_die(1, w->out.buf, w->out.len);
+ printed_something = 1;
+ }
+ free(w->name);
+ free(w->identifier);
+ }
+
+ if (old_done != todo_done)
+ pthread_cond_signal(&cond_write);
+
+ if (all_work_added && todo_done == todo_end)
+ pthread_cond_signal(&cond_result);
+
+ grep_unlock();
+}
+
+static void *run(void *arg)
+{
+ int hit = 0;
+ struct grep_opt *opt = arg;
+
+ while (1) {
+ struct work_item *w = get_work();
+ if (!w)
+ break;
+
+ opt->output_priv = w;
+ if (w->type == WORK_SHA1) {
+ unsigned long sz;
+ void* data = load_sha1(w->identifier, &sz, w->name);
+
+ if (data) {
+ hit |= grep_buffer(opt, w->name, data, sz);
+ free(data);
+ }
+ } else if (w->type == WORK_FILE) {
+ size_t sz;
+ void* data = load_file(w->identifier, &sz);
+ if (data) {
+ hit |= grep_buffer(opt, w->name, data, sz);
+ free(data);
+ }
+ } else {
+ assert(0);
+ }
+
+ work_done(w);
+ }
+ free_grep_patterns(arg);
+ free(arg);
+
+ return (void*) (intptr_t) hit;
+}
+
+static void strbuf_out(struct grep_opt *opt, const void *buf, size_t size)
+{
+ struct work_item *w = opt->output_priv;
+ strbuf_add(&w->out, buf, size);
+}
+
+static void start_threads(struct grep_opt *opt)
+{
+ int i;
+
+ pthread_mutex_init(&grep_mutex, NULL);
+ pthread_mutex_init(&read_sha1_mutex, NULL);
+ pthread_cond_init(&cond_add, NULL);
+ pthread_cond_init(&cond_write, NULL);
+ pthread_cond_init(&cond_result, NULL);
+
+ for (i = 0; i < ARRAY_SIZE(todo); i++) {
+ strbuf_init(&todo[i].out, 0);
+ }
+
+ for (i = 0; i < ARRAY_SIZE(threads); i++) {
+ int err;
+ struct grep_opt *o = grep_opt_dup(opt);
+ o->output = strbuf_out;
+ compile_grep_patterns(o);
+ err = pthread_create(&threads[i], NULL, run, o);
+
+ if (err)
+ die(_("grep: failed to create thread: %s"),
+ strerror(err));
+ }
+}
+
+static int wait_all(void)
+{
+ int hit = 0;
+ int i;
+
+ grep_lock();
+ all_work_added = 1;
+
+ /* Wait until all work is done. */
+ while (todo_done != todo_end)
+ pthread_cond_wait(&cond_result, &grep_mutex);
+
+ /* Wake up all the consumer threads so they can see that there
+ * is no more work to do.
+ */
+ pthread_cond_broadcast(&cond_add);
+ grep_unlock();
+
+ for (i = 0; i < ARRAY_SIZE(threads); i++) {
+ void *h;
+ pthread_join(threads[i], &h);
+ hit |= (int) (intptr_t) h;
+ }
+
+ pthread_mutex_destroy(&grep_mutex);
+ pthread_mutex_destroy(&read_sha1_mutex);
+ pthread_cond_destroy(&cond_add);
+ pthread_cond_destroy(&cond_write);
+ pthread_cond_destroy(&cond_result);
+
+ return hit;
+}
+#else /* !NO_PTHREADS */
+#define read_sha1_lock()
+#define read_sha1_unlock()
+
+static int wait_all(void)
+{
+ return 0;
+}
+#endif
+
+static int grep_config(const char *var, const char *value, void *cb)
+{
+ struct grep_opt *opt = cb;
+ char *color = NULL;
+
+ switch (userdiff_config(var, value)) {
+ case 0: break;
+ case -1: return -1;
+ default: return 0;
+ }
+
+ if (!strcmp(var, "grep.extendedregexp")) {
+ if (git_config_bool(var, value))
+ opt->regflags |= REG_EXTENDED;
+ else
+ opt->regflags &= ~REG_EXTENDED;
+ return 0;
+ }
+
+ if (!strcmp(var, "grep.linenumber")) {
+ opt->linenum = git_config_bool(var, value);
+ return 0;
+ }
+
+ if (!strcmp(var, "color.grep"))
+ opt->color = git_config_colorbool(var, value, -1);
+ else if (!strcmp(var, "color.grep.context"))
+ color = opt->color_context;
+ else if (!strcmp(var, "color.grep.filename"))
+ color = opt->color_filename;
+ else if (!strcmp(var, "color.grep.function"))
+ color = opt->color_function;
+ else if (!strcmp(var, "color.grep.linenumber"))
+ color = opt->color_lineno;
+ else if (!strcmp(var, "color.grep.match"))
+ color = opt->color_match;
+ else if (!strcmp(var, "color.grep.selected"))
+ color = opt->color_selected;
+ else if (!strcmp(var, "color.grep.separator"))
+ color = opt->color_sep;
+ else
+ return git_color_default_config(var, value, cb);
+ if (color) {
+ if (!value)
+ return config_error_nonbool(var);
+ color_parse(value, var, color);
+ }
+ return 0;
+}
+
+static void *lock_and_read_sha1_file(const unsigned char *sha1, enum object_type *type, unsigned long *size)
+{
+ void *data;
+
+ if (use_threads) {
+ read_sha1_lock();
+ data = read_sha1_file(sha1, type, size);
+ read_sha1_unlock();
+ } else {
+ data = read_sha1_file(sha1, type, size);
+ }
+ return data;
+}
+
+static void *load_sha1(const unsigned char *sha1, unsigned long *size,
+ const char *name)
+{
+ enum object_type type;
+ void *data = lock_and_read_sha1_file(sha1, &type, size);
+
+ if (!data)
+ error(_("'%s': unable to read %s"), name, sha1_to_hex(sha1));
+
+ return data;
+}
+
+static int grep_sha1(struct grep_opt *opt, const unsigned char *sha1,
+ const char *filename, int tree_name_len)
+{
+ struct strbuf pathbuf = STRBUF_INIT;
+ char *name;
+
+ if (opt->relative && opt->prefix_length) {
+ quote_path_relative(filename + tree_name_len, -1, &pathbuf,
+ opt->prefix);
+ strbuf_insert(&pathbuf, 0, filename, tree_name_len);
+ } else {
+ strbuf_addstr(&pathbuf, filename);
+ }
+
+ name = strbuf_detach(&pathbuf, NULL);
+
+#ifndef NO_PTHREADS
+ if (use_threads) {
+ grep_sha1_async(opt, name, sha1);
+ return 0;
+ } else
+#endif
+ {
+ int hit;
+ unsigned long sz;
+ void *data = load_sha1(sha1, &sz, name);
+ if (!data)
+ hit = 0;
+ else
+ hit = grep_buffer(opt, name, data, sz);
+
+ free(data);
+ free(name);
+ return hit;
+ }
+}
+
+static void *load_file(const char *filename, size_t *sz)
+{
+ struct stat st;
+ char *data;
+ int i;
+
+ if (lstat(filename, &st) < 0) {
+ err_ret:
+ if (errno != ENOENT)
+ error(_("'%s': %s"), filename, strerror(errno));
+ return NULL;
+ }
+ if (!S_ISREG(st.st_mode))
+ return NULL;
+ *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 NULL;
+ }
+ close(i);
+ data[*sz] = 0;
+ return data;
+}
+
+static int grep_file(struct grep_opt *opt, const char *filename)
+{
+ struct strbuf buf = STRBUF_INIT;
+ char *name;
+
+ if (opt->relative && opt->prefix_length)
+ quote_path_relative(filename, -1, &buf, opt->prefix);
+ else
+ strbuf_addstr(&buf, filename);
+ name = strbuf_detach(&buf, NULL);
+
+#ifndef NO_PTHREADS
+ if (use_threads) {
+ grep_file_async(opt, name, filename);
+ return 0;
+ } else
+#endif
+ {
+ int hit;
+ size_t sz;
+ void *data = load_file(filename, &sz);
+ if (!data)
+ hit = 0;
+ else
+ hit = grep_buffer(opt, name, data, sz);
+
+ free(data);
+ free(name);
+ return hit;
+ }
+}
+
+static void append_path(struct grep_opt *opt, const void *data, size_t len)
+{
+ struct string_list *path_list = opt->output_priv;
+
+ if (len == 1 && *(const char *)data == '\0')
+ return;
+ string_list_append(path_list, xstrndup(data, len));
+}
+
+static void run_pager(struct grep_opt *opt, const char *prefix)
+{
+ struct string_list *path_list = opt->output_priv;
+ const char **argv = xmalloc(sizeof(const char *) * (path_list->nr + 1));
+ int i, status;
+
+ for (i = 0; i < path_list->nr; i++)
+ argv[i] = path_list->items[i].string;
+ argv[path_list->nr] = NULL;
+
+ if (prefix && chdir(prefix))
+ die(_("Failed to chdir: %s"), prefix);
+ status = run_command_v_opt(argv, RUN_USING_SHELL);
+ if (status)
+ exit(status);
+ free(argv);
+}
+
+static int grep_cache(struct grep_opt *opt, const struct pathspec *pathspec, int cached)
+{
+ int hit = 0;
+ int nr;
+ read_cache();
+
+ for (nr = 0; nr < active_nr; nr++) {
+ struct cache_entry *ce = active_cache[nr];
+ if (!S_ISREG(ce->ce_mode))
+ continue;
+ if (!match_pathspec_depth(pathspec, ce->name, ce_namelen(ce), 0, NULL))
+ 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) || ce_skip_worktree(ce)) {
+ 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 */
+ }
+ if (hit && opt->status_only)
+ break;
+ }
+ return hit;
+}
+
+static int grep_tree(struct grep_opt *opt, const struct pathspec *pathspec,
+ struct tree_desc *tree, struct strbuf *base, int tn_len)
+{
+ int hit = 0, match = 0;
+ struct name_entry entry;
+ int old_baselen = base->len;
+
+ while (tree_entry(tree, &entry)) {
+ int te_len = tree_entry_len(entry.path, entry.sha1);
+
+ if (match != 2) {
+ match = tree_entry_interesting(&entry, base, tn_len, pathspec);
+ if (match < 0)
+ break;
+ if (match == 0)
+ continue;
+ }
+
+ strbuf_add(base, entry.path, te_len);
+
+ if (S_ISREG(entry.mode)) {
+ hit |= grep_sha1(opt, entry.sha1, base->buf, tn_len);
+ }
+ else if (S_ISDIR(entry.mode)) {
+ enum object_type type;
+ struct tree_desc sub;
+ void *data;
+ unsigned long size;
+
+ data = lock_and_read_sha1_file(entry.sha1, &type, &size);
+ if (!data)
+ die(_("unable to read tree (%s)"),
+ sha1_to_hex(entry.sha1));
+
+ strbuf_addch(base, '/');
+ init_tree_desc(&sub, data, size);
+ hit |= grep_tree(opt, pathspec, &sub, base, tn_len);
+ free(data);
+ }
+ strbuf_setlen(base, old_baselen);
+
+ if (hit && opt->status_only)
+ break;
+ }
+ return hit;
+}
+
+static int grep_object(struct grep_opt *opt, const struct pathspec *pathspec,
+ 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;
+ struct strbuf base;
+ int hit, len;
+
+ data = read_object_with_reference(obj->sha1, tree_type,
+ &size, NULL);
+ if (!data)
+ die(_("unable to read tree (%s)"), sha1_to_hex(obj->sha1));
+
+ len = name ? strlen(name) : 0;
+ strbuf_init(&base, PATH_MAX + len + 1);
+ if (len) {
+ strbuf_add(&base, name, len);
+ strbuf_addch(&base, ':');
+ }
+ init_tree_desc(&tree, data, size);
+ hit = grep_tree(opt, pathspec, &tree, &base, base.len);
+ strbuf_release(&base);
+ free(data);
+ return hit;
+ }
+ die(_("unable to grep from object of type %s"), typename(obj->type));
+}
+
+static int grep_objects(struct grep_opt *opt, const struct pathspec *pathspec,
+ const struct object_array *list)
+{
+ unsigned int i;
+ int hit = 0;
+ const unsigned int nr = list->nr;
+
+ for (i = 0; i < nr; i++) {
+ struct object *real_obj;
+ real_obj = deref_tag(list->objects[i].item, NULL, 0);
+ if (grep_object(opt, pathspec, real_obj, list->objects[i].name)) {
+ hit = 1;
+ if (opt->status_only)
+ break;
+ }
+ }
+ return hit;
+}
+
+static int grep_directory(struct grep_opt *opt, const struct pathspec *pathspec)
+{
+ struct dir_struct dir;
+ int i, hit = 0;
+
+ memset(&dir, 0, sizeof(dir));
+ setup_standard_excludes(&dir);
+
+ fill_directory(&dir, pathspec->raw);
+ for (i = 0; i < dir.nr; i++) {
+ const char *name = dir.entries[i]->name;
+ int namelen = strlen(name);
+ if (!match_pathspec_depth(pathspec, name, namelen, 0, NULL))
+ continue;
+ hit |= grep_file(opt, dir.entries[i]->name);
+ if (hit && opt->status_only)
+ break;
+ }
+ return hit;
+}
+
+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;
+ int from_stdin = !strcmp(arg, "-");
+ FILE *patterns;
+ int lno = 0;
+ struct strbuf sb = STRBUF_INIT;
+
+ patterns = from_stdin ? stdin : fopen(arg, "r");
+ if (!patterns)
+ die_errno(_("cannot open '%s'"), arg);
+ while (strbuf_getline(&sb, patterns, '\n') == 0) {
+ char *s;
+ size_t len;
+
+ /* ignore empty line like grep does */
+ if (sb.len == 0)
+ continue;
+
+ s = strbuf_detach(&sb, &len);
+ append_grep_pat(grep_opt, s, len, arg, ++lno, GREP_PATTERN);
+ }
+ if (!from_stdin)
+ 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 seen_dashdash = 0;
+ int external_grep_allowed__ignored;
+ const char *show_in_pager = NULL, *default_pager = "dummy";
+ struct grep_opt opt;
+ struct object_array list = OBJECT_ARRAY_INIT;
+ const char **paths = NULL;
+ struct pathspec pathspec;
+ struct string_list path_list = STRING_LIST_INIT_NODUP;
+ int i;
+ int dummy;
+ int use_index = 1;
+ enum {
+ pattern_type_unspecified = 0,
+ pattern_type_bre,
+ pattern_type_ere,
+ pattern_type_fixed,
+ pattern_type_pcre,
+ };
+ int pattern_type = pattern_type_unspecified;
+
+ struct option options[] = {
+ OPT_BOOLEAN(0, "cached", &cached,
+ "search in index instead of in the work tree"),
+ OPT_BOOLEAN(0, "index", &use_index,
+ "--no-index finds in contents not managed by git"),
+ OPT_GROUP(""),
+ OPT_BOOLEAN('v', "invert-match", &opt.invert,
+ "show non-matching lines"),
+ OPT_BOOLEAN('i', "ignore-case", &opt.ignore_case,
+ "case insensitive matching"),
+ 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_SET_INT('E', "extended-regexp", &pattern_type,
+ "use extended POSIX regular expressions",
+ pattern_type_ere),
+ OPT_SET_INT('G', "basic-regexp", &pattern_type,
+ "use basic POSIX regular expressions (default)",
+ pattern_type_bre),
+ OPT_SET_INT('F', "fixed-strings", &pattern_type,
+ "interpret patterns as fixed strings",
+ pattern_type_fixed),
+ OPT_SET_INT('P', "perl-regexp", &pattern_type,
+ "use Perl-compatible regular expressions",
+ pattern_type_pcre),
+ OPT_GROUP(""),
+ OPT_BOOLEAN('n', "line-number", &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__COLOR(&opt.color, "highlight matches"),
+ 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__QUIET(&opt.status_only,
+ "indicate hit with exit status without output"),
+ OPT_BOOLEAN(0, "all-match", &opt.all_match,
+ "show only matches from files that match all patterns"),
+ OPT_GROUP(""),
+ { OPTION_STRING, 'O', "open-files-in-pager", &show_in_pager,
+ "pager", "show matching files in the pager",
+ PARSE_OPT_OPTARG, NULL, (intptr_t)default_pager },
+ OPT_BOOLEAN(0, "ext-grep", &external_grep_allowed__ignored,
+ "allow calling of grep(1) (ignored by this build)"),
+ { OPTION_CALLBACK, 0, "help-all", &options, NULL, "show usage",
+ PARSE_OPT_HIDDEN | PARSE_OPT_NOARG, help_callback },
+ OPT_END()
+ };
+
+ /*
+ * 'git grep -h', unlike 'git grep -h <pattern>', is a request
+ * to show usage information and exit.
+ */
+ if (argc == 2 && !strcmp(argv[1], "-h"))
+ usage_with_options(grep_usage, options);
+
+ 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.header_tail = &opt.header_list;
+ opt.regflags = REG_NEWLINE;
+ opt.max_depth = -1;
+
+ strcpy(opt.color_context, "");
+ strcpy(opt.color_filename, "");
+ strcpy(opt.color_function, "");
+ strcpy(opt.color_lineno, "");
+ strcpy(opt.color_match, GIT_COLOR_BOLD_RED);
+ strcpy(opt.color_selected, "");
+ strcpy(opt.color_sep, GIT_COLOR_CYAN);
+ 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);
+ switch (pattern_type) {
+ case pattern_type_fixed:
+ opt.fixed = 1;
+ opt.pcre = 0;
+ break;
+ case pattern_type_bre:
+ opt.fixed = 0;
+ opt.pcre = 0;
+ opt.regflags &= ~REG_EXTENDED;
+ break;
+ case pattern_type_ere:
+ opt.fixed = 0;
+ opt.pcre = 0;
+ opt.regflags |= REG_EXTENDED;
+ break;
+ case pattern_type_pcre:
+ opt.fixed = 0;
+ opt.pcre = 1;
+ break;
+ default:
+ break; /* nothing */
+ }
+
+ if (use_index && !startup_info->have_repository)
+ /* die the same way as if we did it at the beginning */
+ setup_git_directory();
+
+ /*
+ * skip a -- separator; we know it cannot be
+ * separating revisions from pathnames if
+ * we haven't even had any patterns yet
+ */
+ if (argc > 0 && !opt.pattern_list && !strcmp(argv[0], "--")) {
+ argv++;
+ argc--;
+ }
+
+ /* 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 (show_in_pager == default_pager)
+ show_in_pager = git_pager(1);
+ if (show_in_pager) {
+ opt.color = 0;
+ opt.name_only = 1;
+ opt.null_following_name = 1;
+ opt.output_priv = &path_list;
+ opt.output = append_path;
+ string_list_append(&path_list, show_in_pager);
+ use_threads = 0;
+ }
+
+ if (!opt.pattern_list)
+ die(_("no pattern given."));
+ if (!opt.fixed && opt.ignore_case)
+ opt.regflags |= REG_ICASE;
+
+#ifndef NO_PTHREADS
+ if (online_cpus() == 1 || !grep_threads_ok(&opt))
+ use_threads = 0;
+
+ if (use_threads) {
+ if (opt.pre_context || opt.post_context)
+ print_hunk_marks_between_files = 1;
+ start_threads(&opt);
+ }
+#else
+ use_threads = 0;
+#endif
+
+ 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]);
+ }
+
+ paths = get_pathspec(prefix, argv + i);
+ init_pathspec(&pathspec, paths);
+ pathspec.max_depth = opt.max_depth;
+ pathspec.recursive = 1;
+
+ if (show_in_pager && (cached || list.nr))
+ die(_("--open-files-in-pager only works on the worktree"));
+
+ if (show_in_pager && opt.pattern_list && !opt.pattern_list->next) {
+ const char *pager = path_list.items[0].string;
+ int len = strlen(pager);
+
+ if (len > 4 && is_dir_sep(pager[len - 5]))
+ pager += len - 4;
+
+ if (!strcmp("less", pager) || !strcmp("vi", pager)) {
+ struct strbuf buf = STRBUF_INIT;
+ strbuf_addf(&buf, "+/%s%s",
+ strcmp("less", pager) ? "" : "*",
+ opt.pattern_list->pattern);
+ string_list_append(&path_list, buf.buf);
+ strbuf_detach(&buf, NULL);
+ }
+ }
+
+ if (!show_in_pager)
+ setup_pager();
+
+
+ if (!use_index) {
+ if (cached)
+ die(_("--cached cannot be used with --no-index."));
+ if (list.nr)
+ die(_("--no-index cannot be used with revs."));
+ hit = grep_directory(&opt, &pathspec);
+ } else if (!list.nr) {
+ if (!cached)
+ setup_work_tree();
+
+ hit = grep_cache(&opt, &pathspec, cached);
+ } else {
+ if (cached)
+ die(_("both --cached and trees are given."));
+ hit = grep_objects(&opt, &pathspec, &list);
+ }
+
+ if (use_threads)
+ hit |= wait_all();
+ if (hit && show_in_pager)
+ run_pager(&opt, prefix);
+ free_grep_patterns(&opt);
+ return !hit;
+}