/*
 * "git add" builtin command
 *
 * Copyright (C) 2006 Linus Torvalds
 */
#include "cache.h"
#include "builtin.h"
#include "dir.h"
#include "exec_cmd.h"
#include "cache-tree.h"
#include "diff.h"
#include "diffcore.h"
#include "commit.h"
#include "revision.h"
#include "run-command.h"
#include "parse-options.h"

static const char * const builtin_add_usage[] = {
	"git add [options] [--] <filepattern>...",
	NULL
};
static int patch_interactive = 0, add_interactive = 0;
static int take_worktree_changes;

static void 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;

	for (i = 0; i < specs; i++) {
		if (!seen[i] && !file_exists(pathspec[i]))
			die("pathspec '%s' did not match any files",
					pathspec[i]);
	}
        free(seen);
}

static void fill_directory(struct dir_struct *dir, const char **pathspec,
		int ignored_too)
{
	const char *path, *base;
	int baselen;

	/* Set up the default git porcelain excludes */
	memset(dir, 0, sizeof(*dir));
	if (!ignored_too) {
		dir->collect_ignored = 1;
		setup_standard_excludes(dir);
	}

	/*
	 * Calculate common prefix for the pathspec, and
	 * use that to optimize the directory walk
	 */
	baselen = common_prefix(pathspec);
	path = ".";
	base = "";
	if (baselen)
		path = base = xmemdupz(*pathspec, baselen);

	/* Read the directory and prune it */
	read_directory(dir, path, base, baselen, pathspec);
	if (pathspec)
		prune_directory(dir, pathspec, baselen);
}

struct update_callback_data
{
	int flags;
	int add_errors;
};

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 (p->status) {
		default:
			die("unexpected diff status %c", p->status);
		case DIFF_STATUS_UNMERGED:
		case DIFF_STATUS_MODIFIED:
		case DIFF_STATUS_TYPE_CHANGED:
			if (add_file_to_cache(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_PRETEND))
				remove_file_from_cache(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);
	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;
	run_diff_files(&rev, DIFF_RACY_IS_MODIFIED);
	return !!data.add_errors;
}

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_SAY_CHANGED : REFRESH_QUIET,
		      pathspec, seen);
	for (i = 0; i < specs; i++) {
		if (!seen[i])
			die("pathspec '%s' did not match any files", pathspec[i]);
	}
        free(seen);
}

static const char **validate_pathspec(int argc, const char **argv, const char *prefix)
{
	const char **pathspec = get_pathspec(prefix, argv);

	return pathspec;
}

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

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

	args = xcalloc(sizeof(const char *), (argc + 4));
	ac = 0;
	args[ac++] = "add--interactive";
	if (patch_interactive)
		args[ac++] = "--patch";
	args[ac++] = "--";
	if (argc) {
		memcpy(&(args[ac]), pathspec, sizeof(const char *) * argc);
		ac += argc;
	}
	args[ac] = NULL;

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

static struct lock_file lock_file;

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

static int verbose = 0, show_only = 0, ignored_too = 0, refresh_only = 0;
static int ignore_add_errors, addremove;

static struct option builtin_add_options[] = {
	OPT__DRY_RUN(&show_only),
	OPT__VERBOSE(&verbose),
	OPT_GROUP(""),
	OPT_BOOLEAN('i', "interactive", &add_interactive, "interactive picking"),
	OPT_BOOLEAN('p', "patch", &patch_interactive, "interactive patching"),
	OPT_BOOLEAN('f', "force", &ignored_too, "allow adding otherwise ignored files"),
	OPT_BOOLEAN('u', "update", &take_worktree_changes, "update tracked files"),
	OPT_BOOLEAN('A', "all", &addremove, "add all, noticing removal of tracked files"),
	OPT_BOOLEAN( 0 , "refresh", &refresh_only, "don't add, only refresh the index"),
	OPT_BOOLEAN( 0 , "ignore-errors", &ignore_add_errors, "just skip files which cannot be added because of errors"),
	OPT_END(),
};

static int add_config(const char *var, const char *value, void *cb)
{
	if (!strcasecmp(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;
}

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;

	argc = parse_options(argc, argv, builtin_add_options,
			  builtin_add_usage, 0);
	if (patch_interactive)
		add_interactive = 1;
	if (add_interactive)
		exit(interactive_add(argc, argv, prefix));

	git_config(add_config, NULL);

	if (addremove && take_worktree_changes)
		die("-A and -u are mutually incompatible");
	if (addremove && !argc) {
		static const char *here[2] = { ".", NULL };
		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) |
		 (ignore_add_errors ? ADD_CACHE_IGNORE_ERRORS : 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 = get_pathspec(prefix, argv);

	/*
	 * If we are adding new files, we need to scan the working
	 * tree to find the ones that match pathspecs; this needs
	 * to be done before we read the index.
	 */
	if (add_new_files)
		fill_directory(&dir, pathspec, ignored_too);

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

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

	if (take_worktree_changes || addremove)
		exit_status |= add_files_to_cache(prefix, pathspec, flags);

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

 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;
}