/*
 * "git add" builtin command
 *
 * Copyright (C) 2006 Linus Torvalds
 */
#define USE_THE_INDEX_COMPATIBILITY_MACROS
#include "cache.h"
#include "config.h"
#include "builtin.h"
#include "lockfile.h"
#include "dir.h"
#include "pathspec.h"
#include "exec-cmd.h"
#include "cache-tree.h"
#include "run-command.h"
#include "parse-options.h"
#include "diff.h"
#include "diffcore.h"
#include "revision.h"
#include "bulk-checkin.h"
#include "strvec.h"
#include "submodule.h"
#include "add-interactive.h"

static const char * const builtin_add_usage[] = {
	N_("git add [<options>] [--] <pathspec>..."),
	NULL
};
static int patch_interactive, add_interactive, edit_interactive;
static int take_worktree_changes;
static int add_renormalize;
static int pathspec_file_nul;
static const char *pathspec_from_file;
static int legacy_stash_p; /* support for the scripted `git stash` */

struct update_callback_data {
	int flags;
	int add_errors;
};

static int chmod_pathspec(struct pathspec *pathspec, char flip, int show_only)
{
	int i, ret = 0;

	for (i = 0; i < active_nr; i++) {
		struct cache_entry *ce = active_cache[i];
		int err;

		if (ce_skip_worktree(ce))
			continue;

		if (pathspec && !ce_path_match(&the_index, ce, pathspec, NULL))
			continue;

		if (!show_only)
			err = chmod_cache_entry(ce, flip);
		else
			err = S_ISREG(ce->ce_mode) ? 0 : -1;

		if (err < 0)
			ret = error(_("cannot chmod %cx '%s'"), flip, ce->name);
	}

	return ret;
}

static int fix_unmerged_status(struct diff_filepair *p,
			       struct update_callback_data *data)
{
	if (p->status != DIFF_STATUS_UNMERGED)
		return p->status;
	if (!(data->flags & ADD_CACHE_IGNORE_REMOVAL) && !p->two->mode)
		/*
		 * This is not an explicit add request, and the
		 * path is missing from the working tree (deleted)
		 */
		return DIFF_STATUS_DELETED;
	else
		/*
		 * Either an explicit add request, or path exists
		 * in the working tree.  An attempt to explicitly
		 * add a path that does not exist in the working tree
		 * will be caught as an error by the caller immediately.
		 */
		return DIFF_STATUS_MODIFIED;
}

static void update_callback(struct diff_queue_struct *q,
			    struct diff_options *opt, void *cbdata)
{
	int i;
	struct update_callback_data *data = cbdata;

	for (i = 0; i < q->nr; i++) {
		struct diff_filepair *p = q->queue[i];
		const char *path = p->one->path;
		switch (fix_unmerged_status(p, data)) {
		default:
			die(_("unexpected diff status %c"), p->status);
		case DIFF_STATUS_MODIFIED:
		case DIFF_STATUS_TYPE_CHANGED:
			if (add_file_to_index(&the_index, path,	data->flags)) {
				if (!(data->flags & ADD_CACHE_IGNORE_ERRORS))
					die(_("updating files failed"));
				data->add_errors++;
			}
			break;
		case DIFF_STATUS_DELETED:
			if (data->flags & ADD_CACHE_IGNORE_REMOVAL)
				break;
			if (!(data->flags & ADD_CACHE_PRETEND))
				remove_file_from_index(&the_index, path);
			if (data->flags & (ADD_CACHE_PRETEND|ADD_CACHE_VERBOSE))
				printf(_("remove '%s'\n"), path);
			break;
		}
	}
}

int add_files_to_cache(const char *prefix,
		       const struct pathspec *pathspec, int flags)
{
	struct update_callback_data data;
	struct rev_info rev;

	memset(&data, 0, sizeof(data));
	data.flags = flags;

	repo_init_revisions(the_repository, &rev, prefix);
	setup_revisions(0, NULL, &rev, NULL);
	if (pathspec)
		copy_pathspec(&rev.prune_data, pathspec);
	rev.diffopt.output_format = DIFF_FORMAT_CALLBACK;
	rev.diffopt.format_callback = update_callback;
	rev.diffopt.format_callback_data = &data;
	rev.diffopt.flags.override_submodule_config = 1;
	rev.max_count = 0; /* do not compare unmerged paths with stage #2 */
	run_diff_files(&rev, DIFF_RACY_IS_MODIFIED);
	clear_pathspec(&rev.prune_data);
	return !!data.add_errors;
}

static int renormalize_tracked_files(const struct pathspec *pathspec, int flags)
{
	int i, retval = 0;

	/* TODO: audit for interaction with sparse-index. */
	ensure_full_index(&the_index);
	for (i = 0; i < active_nr; i++) {
		struct cache_entry *ce = active_cache[i];

		if (ce_skip_worktree(ce))
			continue;
		if (ce_stage(ce))
			continue; /* do not touch unmerged paths */
		if (!S_ISREG(ce->ce_mode) && !S_ISLNK(ce->ce_mode))
			continue; /* do not touch non blobs */
		if (pathspec && !ce_path_match(&the_index, ce, pathspec, NULL))
			continue;
		retval |= add_file_to_cache(ce->name, flags | ADD_CACHE_RENORMALIZE);
	}

	return retval;
}

static char *prune_directory(struct dir_struct *dir, struct pathspec *pathspec, int prefix)
{
	char *seen;
	int i;
	struct dir_entry **src, **dst;

	seen = xcalloc(pathspec->nr, 1);

	src = dst = dir->entries;
	i = dir->nr;
	while (--i >= 0) {
		struct dir_entry *entry = *src++;
		if (dir_path_match(&the_index, entry, pathspec, prefix, seen))
			*dst++ = entry;
	}
	dir->nr = dst - dir->entries;
	add_pathspec_matches_against_index(pathspec, &the_index, seen,
					   PS_IGNORE_SKIP_WORKTREE);
	return seen;
}

static int refresh(int verbose, const struct pathspec *pathspec)
{
	char *seen;
	int i, ret = 0;
	char *skip_worktree_seen = NULL;
	struct string_list only_match_skip_worktree = STRING_LIST_INIT_NODUP;
	int flags = REFRESH_IGNORE_SKIP_WORKTREE |
		    (verbose ? REFRESH_IN_PORCELAIN : REFRESH_QUIET);

	seen = xcalloc(pathspec->nr, 1);
	refresh_index(&the_index, flags, pathspec, seen,
		      _("Unstaged changes after refreshing the index:"));
	for (i = 0; i < pathspec->nr; i++) {
		if (!seen[i]) {
			if (matches_skip_worktree(pathspec, i, &skip_worktree_seen)) {
				string_list_append(&only_match_skip_worktree,
						   pathspec->items[i].original);
			} else {
				die(_("pathspec '%s' did not match any files"),
				    pathspec->items[i].original);
			}
		}
	}

	if (only_match_skip_worktree.nr) {
		advise_on_updating_sparse_paths(&only_match_skip_worktree);
		ret = 1;
	}

	free(seen);
	free(skip_worktree_seen);
	string_list_clear(&only_match_skip_worktree, 0);
	return ret;
}

int run_add_interactive(const char *revision, const char *patch_mode,
			const struct pathspec *pathspec)
{
	int status, i;
	struct strvec argv = STRVEC_INIT;
	int use_builtin_add_i =
		git_env_bool("GIT_TEST_ADD_I_USE_BUILTIN", -1);

	if (use_builtin_add_i < 0) {
		int experimental;
		if (!git_config_get_bool("add.interactive.usebuiltin",
					 &use_builtin_add_i))
			; /* ok */
		else if (!git_config_get_bool("feature.experimental", &experimental) &&
			 experimental)
			use_builtin_add_i = 1;
	}

	if (use_builtin_add_i == 1) {
		enum add_p_mode mode;

		if (!patch_mode)
			return !!run_add_i(the_repository, pathspec);

		if (!strcmp(patch_mode, "--patch"))
			mode = ADD_P_ADD;
		else if (!strcmp(patch_mode, "--patch=stash"))
			mode = ADD_P_STASH;
		else if (!strcmp(patch_mode, "--patch=reset"))
			mode = ADD_P_RESET;
		else if (!strcmp(patch_mode, "--patch=checkout"))
			mode = ADD_P_CHECKOUT;
		else if (!strcmp(patch_mode, "--patch=worktree"))
			mode = ADD_P_WORKTREE;
		else
			die("'%s' not supported", patch_mode);

		return !!run_add_p(the_repository, mode, revision, pathspec);
	}

	strvec_push(&argv, "add--interactive");
	if (patch_mode)
		strvec_push(&argv, patch_mode);
	if (revision)
		strvec_push(&argv, revision);
	strvec_push(&argv, "--");
	for (i = 0; i < pathspec->nr; i++)
		/* pass original pathspec, to be re-parsed */
		strvec_push(&argv, pathspec->items[i].original);

	status = run_command_v_opt(argv.v, RUN_GIT_CMD);
	strvec_clear(&argv);
	return status;
}

int interactive_add(const char **argv, const char *prefix, int patch)
{
	struct pathspec pathspec;

	parse_pathspec(&pathspec, 0,
		       PATHSPEC_PREFER_FULL |
		       PATHSPEC_SYMLINK_LEADING_PATH |
		       PATHSPEC_PREFIX_ORIGIN,
		       prefix, argv);

	return run_add_interactive(NULL,
				   patch ? "--patch" : NULL,
				   &pathspec);
}

static int edit_patch(int argc, const char **argv, const char *prefix)
{
	char *file = git_pathdup("ADD_EDIT.patch");
	const char *apply_argv[] = { "apply", "--recount", "--cached",
		NULL, NULL };
	struct child_process child = CHILD_PROCESS_INIT;
	struct rev_info rev;
	int out;
	struct stat st;

	apply_argv[3] = file;

	git_config(git_diff_basic_config, NULL); /* no "diff" UI options */

	if (read_cache() < 0)
		die(_("Could not read the index"));

	repo_init_revisions(the_repository, &rev, prefix);
	rev.diffopt.context = 7;

	argc = setup_revisions(argc, argv, &rev, NULL);
	rev.diffopt.output_format = DIFF_FORMAT_PATCH;
	rev.diffopt.use_color = 0;
	rev.diffopt.flags.ignore_dirty_submodules = 1;
	out = open(file, O_CREAT | O_WRONLY | O_TRUNC, 0666);
	if (out < 0)
		die(_("Could not open '%s' for writing."), file);
	rev.diffopt.file = xfdopen(out, "w");
	rev.diffopt.close_file = 1;
	if (run_diff_files(&rev, 0))
		die(_("Could not write patch"));

	if (launch_editor(file, NULL, NULL))
		die(_("editing patch failed"));

	if (stat(file, &st))
		die_errno(_("Could not stat '%s'"), file);
	if (!st.st_size)
		die(_("Empty patch. Aborted."));

	child.git_cmd = 1;
	child.argv = apply_argv;
	if (run_command(&child))
		die(_("Could not apply '%s'"), file);

	unlink(file);
	free(file);
	return 0;
}

static const char ignore_error[] =
N_("The following paths are ignored by one of your .gitignore files:\n");

static int verbose, show_only, ignored_too, refresh_only;
static int ignore_add_errors, intent_to_add, ignore_missing;
static int warn_on_embedded_repo = 1;

#define ADDREMOVE_DEFAULT 1
static int addremove = ADDREMOVE_DEFAULT;
static int addremove_explicit = -1; /* unspecified */

static char *chmod_arg;

static int ignore_removal_cb(const struct option *opt, const char *arg, int unset)
{
	/* if we are told to ignore, we are not adding removals */
	*(int *)opt->value = !unset ? 0 : 1;
	return 0;
}

static struct option builtin_add_options[] = {
	OPT__DRY_RUN(&show_only, N_("dry run")),
	OPT__VERBOSE(&verbose, N_("be verbose")),
	OPT_GROUP(""),
	OPT_BOOL('i', "interactive", &add_interactive, N_("interactive picking")),
	OPT_BOOL('p', "patch", &patch_interactive, N_("select hunks interactively")),
	OPT_BOOL('e', "edit", &edit_interactive, N_("edit current diff and apply")),
	OPT__FORCE(&ignored_too, N_("allow adding otherwise ignored files"), 0),
	OPT_BOOL('u', "update", &take_worktree_changes, N_("update tracked files")),
	OPT_BOOL(0, "renormalize", &add_renormalize, N_("renormalize EOL of tracked files (implies -u)")),
	OPT_BOOL('N', "intent-to-add", &intent_to_add, N_("record only the fact that the path will be added later")),
	OPT_BOOL('A', "all", &addremove_explicit, N_("add changes from all tracked and untracked files")),
	OPT_CALLBACK_F(0, "ignore-removal", &addremove_explicit,
	  NULL /* takes no arguments */,
	  N_("ignore paths removed in the working tree (same as --no-all)"),
	  PARSE_OPT_NOARG, ignore_removal_cb),
	OPT_BOOL( 0 , "refresh", &refresh_only, N_("don't add, only refresh the index")),
	OPT_BOOL( 0 , "ignore-errors", &ignore_add_errors, N_("just skip files which cannot be added because of errors")),
	OPT_BOOL( 0 , "ignore-missing", &ignore_missing, N_("check if - even missing - files are ignored in dry run")),
	OPT_STRING(0, "chmod", &chmod_arg, "(+|-)x",
		   N_("override the executable bit of the listed files")),
	OPT_HIDDEN_BOOL(0, "warn-embedded-repo", &warn_on_embedded_repo,
			N_("warn when adding an embedded repository")),
	OPT_HIDDEN_BOOL(0, "legacy-stash-p", &legacy_stash_p,
			N_("backend for `git stash -p`")),
	OPT_PATHSPEC_FROM_FILE(&pathspec_from_file),
	OPT_PATHSPEC_FILE_NUL(&pathspec_file_nul),
	OPT_END(),
};

static int add_config(const char *var, const char *value, void *cb)
{
	if (!strcmp(var, "add.ignoreerrors") ||
	    !strcmp(var, "add.ignore-errors")) {
		ignore_add_errors = git_config_bool(var, value);
		return 0;
	}

	return git_default_config(var, value, cb);
}

static const char embedded_advice[] = N_(
"You've added another git repository inside your current repository.\n"
"Clones of the outer repository will not contain the contents of\n"
"the embedded repository and will not know how to obtain it.\n"
"If you meant to add a submodule, use:\n"
"\n"
"	git submodule add <url> %s\n"
"\n"
"If you added this path by mistake, you can remove it from the\n"
"index with:\n"
"\n"
"	git rm --cached %s\n"
"\n"
"See \"git help submodule\" for more information."
);

static void check_embedded_repo(const char *path)
{
	struct strbuf name = STRBUF_INIT;

	if (!warn_on_embedded_repo)
		return;
	if (!ends_with(path, "/"))
		return;

	/* Drop trailing slash for aesthetics */
	strbuf_addstr(&name, path);
	strbuf_strip_suffix(&name, "/");

	warning(_("adding embedded git repository: %s"), name.buf);
	if (advice_add_embedded_repo) {
		advise(embedded_advice, name.buf, name.buf);
		/* there may be multiple entries; advise only once */
		advice_add_embedded_repo = 0;
	}

	strbuf_release(&name);
}

static int add_files(struct dir_struct *dir, int flags)
{
	int i, exit_status = 0;

	if (dir->ignored_nr) {
		fprintf(stderr, _(ignore_error));
		for (i = 0; i < dir->ignored_nr; i++)
			fprintf(stderr, "%s\n", dir->ignored[i]->name);
		if (advice_add_ignored_file)
			advise(_("Use -f if you really want to add them.\n"
				"Turn this message off by running\n"
				"\"git config advice.addIgnoredFile false\""));
		exit_status = 1;
	}

	for (i = 0; i < dir->nr; i++) {
		if (add_file_to_index(&the_index, dir->entries[i]->name, flags)) {
			if (!ignore_add_errors)
				die(_("adding files failed"));
			exit_status = 1;
		} else {
			check_embedded_repo(dir->entries[i]->name);
		}
	}
	return exit_status;
}

int cmd_add(int argc, const char **argv, const char *prefix)
{
	int exit_status = 0;
	struct pathspec pathspec;
	struct dir_struct dir;
	int flags;
	int add_new_files;
	int require_pathspec;
	char *seen = NULL;
	struct lock_file lock_file = LOCK_INIT;

	git_config(add_config, NULL);

	argc = parse_options(argc, argv, prefix, builtin_add_options,
			  builtin_add_usage, PARSE_OPT_KEEP_ARGV0);
	if (patch_interactive)
		add_interactive = 1;
	if (add_interactive) {
		if (show_only)
			die(_("--dry-run is incompatible with --interactive/--patch"));
		if (pathspec_from_file)
			die(_("--pathspec-from-file is incompatible with --interactive/--patch"));
		exit(interactive_add(argv + 1, prefix, patch_interactive));
	}
	if (legacy_stash_p) {
		struct pathspec pathspec;

		parse_pathspec(&pathspec, 0,
			PATHSPEC_PREFER_FULL |
			PATHSPEC_SYMLINK_LEADING_PATH |
			PATHSPEC_PREFIX_ORIGIN,
			prefix, argv);

		return run_add_interactive(NULL, "--patch=stash", &pathspec);
	}

	if (edit_interactive) {
		if (pathspec_from_file)
			die(_("--pathspec-from-file is incompatible with --edit"));
		return(edit_patch(argc, argv, prefix));
	}
	argc--;
	argv++;

	if (0 <= addremove_explicit)
		addremove = addremove_explicit;
	else if (take_worktree_changes && ADDREMOVE_DEFAULT)
		addremove = 0; /* "-u" was given but not "-A" */

	if (addremove && take_worktree_changes)
		die(_("-A and -u are mutually incompatible"));

	if (!show_only && ignore_missing)
		die(_("Option --ignore-missing can only be used together with --dry-run"));

	if (chmod_arg && ((chmod_arg[0] != '-' && chmod_arg[0] != '+') ||
			  chmod_arg[1] != 'x' || chmod_arg[2]))
		die(_("--chmod param '%s' must be either -x or +x"), chmod_arg);

	add_new_files = !take_worktree_changes && !refresh_only && !add_renormalize;
	require_pathspec = !(take_worktree_changes || (0 < addremove_explicit));

	hold_locked_index(&lock_file, LOCK_DIE_ON_ERROR);

	/*
	 * Check the "pathspec '%s' did not match any files" block
	 * below before enabling new magic.
	 */
	parse_pathspec(&pathspec, PATHSPEC_ATTR,
		       PATHSPEC_PREFER_FULL |
		       PATHSPEC_SYMLINK_LEADING_PATH,
		       prefix, argv);

	if (pathspec_from_file) {
		if (pathspec.nr)
			die(_("--pathspec-from-file is incompatible with pathspec arguments"));

		parse_pathspec_file(&pathspec, PATHSPEC_ATTR,
				    PATHSPEC_PREFER_FULL |
				    PATHSPEC_SYMLINK_LEADING_PATH,
				    prefix, pathspec_from_file, pathspec_file_nul);
	} else if (pathspec_file_nul) {
		die(_("--pathspec-file-nul requires --pathspec-from-file"));
	}

	if (require_pathspec && pathspec.nr == 0) {
		fprintf(stderr, _("Nothing specified, nothing added.\n"));
		if (advice_add_empty_pathspec)
			advise( _("Maybe you wanted to say 'git add .'?\n"
				"Turn this message off by running\n"
				"\"git config advice.addEmptyPathspec false\""));
		return 0;
	}

	if (!take_worktree_changes && addremove_explicit < 0 && pathspec.nr)
		/* Turn "git add pathspec..." to "git add -A pathspec..." */
		addremove = 1;

	flags = ((verbose ? ADD_CACHE_VERBOSE : 0) |
		 (show_only ? ADD_CACHE_PRETEND : 0) |
		 (intent_to_add ? ADD_CACHE_INTENT : 0) |
		 (ignore_add_errors ? ADD_CACHE_IGNORE_ERRORS : 0) |
		 (!(addremove || take_worktree_changes)
		  ? ADD_CACHE_IGNORE_REMOVAL : 0));

	if (read_cache_preload(&pathspec) < 0)
		die(_("index file corrupt"));

	die_in_unpopulated_submodule(&the_index, prefix);
	die_path_inside_submodule(&the_index, &pathspec);

	enable_fscache(0);
	/* We do not really re-read the index but update the up-to-date flags */
	preload_index(&the_index, &pathspec, 0);

	dir_init(&dir);
	if (add_new_files) {
		int baselen;

		/* Set up the default git porcelain excludes */
		if (!ignored_too) {
			dir.flags |= DIR_COLLECT_IGNORED;
			setup_standard_excludes(&dir);
		}

		/* This picks up the paths that are not tracked */
		baselen = fill_directory(&dir, &the_index, &pathspec);
		if (pathspec.nr)
			seen = prune_directory(&dir, &pathspec, baselen);
	}

	if (refresh_only) {
		exit_status |= refresh(verbose, &pathspec);
		goto finish;
	}

	if (pathspec.nr) {
		int i;
		char *skip_worktree_seen = NULL;
		struct string_list only_match_skip_worktree = STRING_LIST_INIT_NODUP;

		if (!seen)
			seen = find_pathspecs_matching_against_index(&pathspec,
					&the_index, PS_IGNORE_SKIP_WORKTREE);

		/*
		 * file_exists() assumes exact match
		 */
		GUARD_PATHSPEC(&pathspec,
			       PATHSPEC_FROMTOP |
			       PATHSPEC_LITERAL |
			       PATHSPEC_GLOB |
			       PATHSPEC_ICASE |
			       PATHSPEC_EXCLUDE);

		for (i = 0; i < pathspec.nr; i++) {
			const char *path = pathspec.items[i].match;

			if (pathspec.items[i].magic & PATHSPEC_EXCLUDE)
				continue;
			if (seen[i])
				continue;

			if (matches_skip_worktree(&pathspec, i, &skip_worktree_seen)) {
				string_list_append(&only_match_skip_worktree,
						   pathspec.items[i].original);
				continue;
			}

			/* Don't complain at 'git add .' on empty repo */
			if (!path[0])
				continue;

			if ((pathspec.items[i].magic & (PATHSPEC_GLOB | PATHSPEC_ICASE)) ||
			    !file_exists(path)) {
				if (ignore_missing) {
					int dtype = DT_UNKNOWN;
					if (is_excluded(&dir, &the_index, path, &dtype))
						dir_add_ignored(&dir, &the_index,
								path, pathspec.items[i].len);
				} else
					die(_("pathspec '%s' did not match any files"),
					    pathspec.items[i].original);
			}
		}


		if (only_match_skip_worktree.nr) {
			advise_on_updating_sparse_paths(&only_match_skip_worktree);
			exit_status = 1;
		}

		free(seen);
		free(skip_worktree_seen);
		string_list_clear(&only_match_skip_worktree, 0);
	}

	plug_bulk_checkin();

	if (add_renormalize)
		exit_status |= renormalize_tracked_files(&pathspec, flags);
	else
		exit_status |= add_files_to_cache(prefix, &pathspec, flags);

	if (add_new_files)
		exit_status |= add_files(&dir, flags);

	if (chmod_arg && pathspec.nr)
		exit_status |= chmod_pathspec(&pathspec, chmod_arg[0], show_only);
	unplug_bulk_checkin();

finish:
	if (write_locked_index(&the_index, &lock_file,
			       COMMIT_LOCK | SKIP_IF_UNCHANGED))
		die(_("Unable to write new index file"));

	dir_clear(&dir);
	enable_fscache(0);
	UNLEAK(pathspec);
	return exit_status;
}
