/*
 * "git add" builtin command
 *
 * Copyright (C) 2006 Linus Torvalds
 */
#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 "argv-array.h"
#include "submodule.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;

struct update_callback_data {
	int flags;
	int add_errors;
};

static void chmod_pathspec(struct pathspec *pathspec, char flip)
{
	int i;

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

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

		if (chmod_cache_entry(ce, flip) < 0)
			fprintf(stderr, "cannot chmod %cx '%s'\n", flip, ce->name);
	}
}

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;

	init_revisions(&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.max_count = 0; /* do not compare unmerged paths with stage #2 */
	run_diff_files(&rev, DIFF_RACY_IS_MODIFIED);
	return !!data.add_errors;
}

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(entry, pathspec, prefix, seen))
			*dst++ = entry;
	}
	dir->nr = dst - dir->entries;
	add_pathspec_matches_against_index(pathspec, &the_index, seen);
	return seen;
}

static void refresh(int verbose, const struct pathspec *pathspec)
{
	char *seen;
	int i;

	seen = xcalloc(pathspec->nr, 1);
	refresh_index(&the_index, verbose ? REFRESH_IN_PORCELAIN : REFRESH_QUIET,
		      pathspec, seen, _("Unstaged changes after refreshing the index:"));
	for (i = 0; i < pathspec->nr; i++) {
		if (!seen[i])
			die(_("pathspec '%s' did not match any files"),
			    pathspec->items[i].match);
	}
        free(seen);
}

int run_add_interactive(const char *revision, const char *patch_mode,
			const struct pathspec *pathspec)
{
	int status, i;
	struct argv_array argv = ARGV_ARRAY_INIT;

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

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

int interactive_add(int argc, 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"));

	init_revisions(&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;
	DIFF_OPT_SET(&rev.diffopt, IGNORE_DIRTY_SUBMODULES);
	out = open(file, O_CREAT | O_WRONLY, 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 struct lock_file lock_file;

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")),
	OPT_BOOL('u', "update", &take_worktree_changes, N_("update tracked files")),
	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")),
	{ OPTION_CALLBACK, 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, N_("(+/-)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_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);
		fprintf(stderr, _("Use -f if you really want to add them.\n"));
		exit_status = 1;
	}

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

	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)
		exit(interactive_add(argc - 1, argv + 1, prefix, patch_interactive));

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

	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;
	require_pathspec = !(take_worktree_changes || (0 < addremove_explicit));

	hold_locked_index(&lock_file, LOCK_DIE_ON_ERROR);

	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 (require_pathspec && argc == 0) {
		fprintf(stderr, _("Nothing specified, nothing added.\n"));
		fprintf(stderr, _("Maybe you wanted to say 'git add .'?\n"));
		return 0;
	}

	if (read_cache() < 0)
		die(_("index file corrupt"));

	die_in_unpopulated_submodule(&the_index, prefix);

	/*
	 * Check the "pathspec '%s' did not match any files" block
	 * below before enabling new magic.
	 */
	parse_pathspec(&pathspec, 0,
		       PATHSPEC_PREFER_FULL |
		       PATHSPEC_SYMLINK_LEADING_PATH,
		       prefix, argv);

	die_path_inside_submodule(&the_index, &pathspec);

	if (add_new_files) {
		int baselen;

		/* Set up the default git porcelain excludes */
		memset(&dir, 0, sizeof(dir));
		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) {
		refresh(verbose, &pathspec);
		goto finish;
	}

	if (pathspec.nr) {
		int i;

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

		/*
		 * 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] && path[0] &&
			    ((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);
			}
		}
		free(seen);
	}

	plug_bulk_checkin();

	exit_status |= add_files_to_cache(prefix, &pathspec, flags);

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

	if (chmod_arg && pathspec.nr)
		chmod_pathspec(&pathspec, chmod_arg[0]);
	unplug_bulk_checkin();

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

	return exit_status;
}