/*
 * "git add" builtin command
 *
 * Copyright (C) 2006 Linus Torvalds
 */
#include "cache.h"
#include "builtin.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"

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 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 char **pathspec, int flags)
{
	struct update_callback_data data;
	struct rev_info rev;
	init_revisions(&rev, prefix);
	setup_revisions(0, NULL, &rev, NULL);
	init_pathspec(&rev.prune_data, pathspec);
	rev.diffopt.output_format = DIFF_FORMAT_CALLBACK;
	rev.diffopt.format_callback = update_callback;
	data.flags = flags;
	data.add_errors = 0;
	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, const char **pathspec, int prefix)
{
	char *seen;
	int i, specs;
	struct dir_entry **src, **dst;

	for (specs = 0; pathspec[specs];  specs++)
		/* nothing */;
	seen = xcalloc(specs, 1);

	src = dst = dir->entries;
	i = dir->nr;
	while (--i >= 0) {
		struct dir_entry *entry = *src++;
		if (match_pathspec(pathspec, entry->name, entry->len,
				   prefix, seen))
			*dst++ = entry;
	}
	dir->nr = dst - dir->entries;
	add_pathspec_matches_against_index(pathspec, seen, specs);
	return seen;
}

/*
 * Checks the index to see whether any path in pathspec refers to
 * something inside a submodule.  If so, dies with an error message.
 */
static void treat_gitlinks(const char **pathspec)
{
	int i;

	if (!pathspec || !*pathspec)
		return;

	for (i = 0; pathspec[i]; i++)
		pathspec[i] = check_path_for_gitlink(pathspec[i]);
}

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

	for (specs = 0; pathspec[specs];  specs++)
		/* nothing */;
	seen = xcalloc(specs, 1);
	refresh_index(&the_index, verbose ? REFRESH_IN_PORCELAIN : REFRESH_QUIET,
		      pathspec, seen, _("Unstaged changes after refreshing the index:"));
	for (i = 0; i < specs; i++) {
		if (!seen[i])
			die(_("pathspec '%s' did not match any files"), pathspec[i]);
	}
        free(seen);
}

/*
 * Normalizes argv relative to prefix, via get_pathspec(), and then
 * runs die_if_path_beyond_symlink() on each path in the normalized
 * list.
 */
static const char **validate_pathspec(const char **argv, const char *prefix)
{
	const char **pathspec = get_pathspec(prefix, argv);

	if (pathspec) {
		const char **p;
		for (p = pathspec; *p; p++) {
			die_if_path_beyond_symlink(*p, prefix);
		}
	}

	return pathspec;
}

int run_add_interactive(const char *revision, const char *patch_mode,
			const char **pathspec)
{
	int status, ac, pc = 0;
	const char **args;

	if (pathspec)
		while (pathspec[pc])
			pc++;

	args = xcalloc(sizeof(const char *), (pc + 5));
	ac = 0;
	args[ac++] = "add--interactive";
	if (patch_mode)
		args[ac++] = patch_mode;
	if (revision)
		args[ac++] = revision;
	args[ac++] = "--";
	if (pc) {
		memcpy(&(args[ac]), pathspec, sizeof(const char *) * pc);
		ac += pc;
	}
	args[ac] = NULL;

	status = run_command_v_opt(args, RUN_GIT_CMD);
	free(args);
	return status;
}

int interactive_add(int argc, const char **argv, const char *prefix, int patch)
{
	const char **pathspec = NULL;

	if (argc) {
		pathspec = validate_pathspec(argv, prefix);
		if (!pathspec)
			return -1;
	}

	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;
	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;
	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"));

	launch_editor(file, NULL, NULL);

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

	memset(&child, 0, sizeof(child));
	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;

#define ADDREMOVE_DEFAULT 0 /* Change to 1 in Git 2.0 */
static int addremove = ADDREMOVE_DEFAULT;
static int addremove_explicit = -1; /* unspecified */

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")),
	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_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 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"));
		die(_("no files added"));
	}

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

static void warn_pathless_add(const char *option_name, const char *short_name) {
	/*
	 * To be consistent with "git add -p" and most Git
	 * commands, we should default to being tree-wide, but
	 * this is not the original behavior and can't be
	 * changed until users trained themselves not to type
	 * "git add -u" or "git add -A". For now, we warn and
	 * keep the old behavior. Later, this warning can be
	 * turned into a die(...), and eventually we may
	 * reallow the command with a new behavior.
	 */
	warning(_("The behavior of 'git add %s (or %s)' with no path argument from a\n"
		  "subdirectory of the tree will change in Git 2.0 and should not be used anymore.\n"
		  "To add content for the whole tree, run:\n"
		  "\n"
		  "  git add %s :/\n"
		  "  (or git add %s :/)\n"
		  "\n"
		  "To restrict the command to the current directory, run:\n"
		  "\n"
		  "  git add %s .\n"
		  "  (or git add %s .)\n"
		  "\n"
		  "With the current Git version, the command is restricted to the current directory."),
		option_name, short_name,
		option_name, short_name,
		option_name, short_name);
}

static int directory_given(int argc, const char **argv)
{
	struct stat st;

	while (argc--) {
		if (!lstat(*argv, &st) && S_ISDIR(st.st_mode))
			return 1;
		argv++;
	}
	return 0;
}

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

	/*
	 * Warn when "git add pathspec..." was given without "-u" or "-A"
	 * and pathspec... contains a directory name.
	 */
	if (!take_worktree_changes && addremove_explicit < 0 &&
	    directory_given(argc, argv))
		warning(_("In Git 2.0, 'git add <pathspec>...' will also update the\n"
			  "index for paths removed from the working tree that match\n"
			  "the given pathspec. If you want to 'add' only changed\n"
			  "or newly created paths, say 'git add --no-all <pathspec>...'"
			  " instead."));

	if (!take_worktree_changes && addremove_explicit < 0 && argc)
		/*
		 * Turn "git add pathspec..." to "git add -A pathspec..."
		 * in Git 2.0 but not yet
		 */
		; /* addremove = 1; */

	if (!show_only && ignore_missing)
		die(_("Option --ignore-missing can only be used together with --dry-run"));
	if (addremove) {
		option_with_implicit_dot = "--all";
		short_option_with_implicit_dot = "-A";
	}
	if (take_worktree_changes) {
		option_with_implicit_dot = "--update";
		short_option_with_implicit_dot = "-u";
	}
	if (option_with_implicit_dot && !argc) {
		static const char *here[2] = { ".", NULL };
		if (prefix)
			warn_pathless_add(option_with_implicit_dot,
					  short_option_with_implicit_dot);
		argc = 1;
		argv = here;
	}

	add_new_files = !take_worktree_changes && !refresh_only;
	require_pathspec = !take_worktree_changes;

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

	if (read_cache() < 0)
		die(_("index file corrupt"));
	treat_gitlinks(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, pathspec);
		if (pathspec)
			seen = prune_directory(&dir, pathspec, baselen);
	}

	if (refresh_only) {
		refresh(verbose, pathspec);
		goto finish;
	}

	if (pathspec) {
		int i;
		struct path_exclude_check check;

		path_exclude_check_init(&check, &dir);
		if (!seen)
			seen = find_pathspecs_matching_against_index(pathspec);
		for (i = 0; pathspec[i]; i++) {
			if (!seen[i] && pathspec[i][0]
			    && !file_exists(pathspec[i])) {
				if (ignore_missing) {
					int dtype = DT_UNKNOWN;
					if (is_path_excluded(&check, pathspec[i], -1, &dtype))
						dir_add_ignored(&dir, pathspec[i], strlen(pathspec[i]));
				} else
					die(_("pathspec '%s' did not match any files"),
					    pathspec[i]);
			}
		}
		free(seen);
		path_exclude_check_clear(&check);
	}

	plug_bulk_checkin();

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

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

	unplug_bulk_checkin();

 finish:
	if (active_cache_changed) {
		if (write_cache(newfd, active_cache, active_nr) ||
		    commit_locked_index(&lock_file))
			die(_("Unable to write new index file"));
	}

	return exit_status;
}