/*
 * "git clean" builtin command
 *
 * Copyright (C) 2007 Shawn Bohrer
 *
 * Based on git-clean.sh by Pavel Roskin
 */

#include "builtin.h"
#include "cache.h"
#include "config.h"
#include "dir.h"
#include "parse-options.h"
#include "string-list.h"
#include "quote.h"
#include "column.h"
#include "color.h"
#include "pathspec.h"

static int force = -1; /* unset */
static int interactive;
static struct string_list del_list = STRING_LIST_INIT_DUP;
static unsigned int colopts;

static const char *const builtin_clean_usage[] = {
        N_("git clean [-d] [-f] [-i] [-n] [-q] [-e <pattern>] [-x | -X] [--] <paths>..."),
        NULL
};

static const char *msg_remove = N_("Removing %s\n");
static const char *msg_would_remove = N_("Would remove %s\n");
static const char *msg_skip_git_dir = N_("Skipping repository %s\n");
static const char *msg_would_skip_git_dir = N_("Would skip repository %s\n");
static const char *msg_warn_remove_failed = N_("failed to remove %s");

enum color_clean {
        CLEAN_COLOR_RESET = 0,
        CLEAN_COLOR_PLAIN = 1,
        CLEAN_COLOR_PROMPT = 2,
        CLEAN_COLOR_HEADER = 3,
        CLEAN_COLOR_HELP = 4,
        CLEAN_COLOR_ERROR = 5
};

static int clean_use_color = -1;
static char clean_colors[][COLOR_MAXLEN] = {
        [CLEAN_COLOR_ERROR] = GIT_COLOR_BOLD_RED,
        [CLEAN_COLOR_HEADER] = GIT_COLOR_BOLD,
        [CLEAN_COLOR_HELP] = GIT_COLOR_BOLD_RED,
        [CLEAN_COLOR_PLAIN] = GIT_COLOR_NORMAL,
        [CLEAN_COLOR_PROMPT] = GIT_COLOR_BOLD_BLUE,
        [CLEAN_COLOR_RESET] = GIT_COLOR_RESET,
};

#define MENU_OPTS_SINGLETON             01
#define MENU_OPTS_IMMEDIATE             02
#define MENU_OPTS_LIST_ONLY             04

struct menu_opts {
        const char *header;
        const char *prompt;
        int flags;
};

#define MENU_RETURN_NO_LOOP             10

struct menu_item {
        char hotkey;
        const char *title;
        int selected;
        int (*fn)(void);
};

enum menu_stuff_type {
        MENU_STUFF_TYPE_STRING_LIST = 1,
        MENU_STUFF_TYPE_MENU_ITEM
};

struct menu_stuff {
        enum menu_stuff_type type;
        int nr;
        void *stuff;
};

static int parse_clean_color_slot(const char *var)
{
        if (!strcasecmp(var, "reset"))
                return CLEAN_COLOR_RESET;
        if (!strcasecmp(var, "plain"))
                return CLEAN_COLOR_PLAIN;
        if (!strcasecmp(var, "prompt"))
                return CLEAN_COLOR_PROMPT;
        if (!strcasecmp(var, "header"))
                return CLEAN_COLOR_HEADER;
        if (!strcasecmp(var, "help"))
                return CLEAN_COLOR_HELP;
        if (!strcasecmp(var, "error"))
                return CLEAN_COLOR_ERROR;
        return -1;
}

static int git_clean_config(const char *var, const char *value, void *cb)
{
        const char *slot_name;

        if (starts_with(var, "column."))
                return git_column_config(var, value, "clean", &colopts);

        /* honors the color.interactive* config variables which also
           applied in git-add--interactive and git-stash */
        if (!strcmp(var, "color.interactive")) {
                clean_use_color = git_config_colorbool(var, value);
                return 0;
        }
        if (skip_prefix(var, "color.interactive.", &slot_name)) {
                int slot = parse_clean_color_slot(slot_name);
                if (slot < 0)
                        return 0;
                if (!value)
                        return config_error_nonbool(var);
                return color_parse(value, clean_colors[slot]);
        }

        if (!strcmp(var, "clean.requireforce")) {
                force = !git_config_bool(var, value);
                return 0;
        }

        return git_default_config(var, value, cb);
}

static const char *clean_get_color(enum color_clean ix)
{
        if (want_color(clean_use_color))
                return clean_colors[ix];
        return "";
}

static void clean_print_color(enum color_clean ix)
{
        printf("%s", clean_get_color(ix));
}

static int exclude_cb(const struct option *opt, const char *arg, int unset)
{
        struct string_list *exclude_list = opt->value;
        string_list_append(exclude_list, arg);
        return 0;
}

static int remove_dirs(struct strbuf *path, const char *prefix, int force_flag,
                int dry_run, int quiet, int *dir_gone)
{
        DIR *dir;
        struct strbuf quoted = STRBUF_INIT;
        struct dirent *e;
        int res = 0, ret = 0, gone = 1, original_len = path->len, len;
        struct string_list dels = STRING_LIST_INIT_DUP;

        *dir_gone = 1;

        if ((force_flag & REMOVE_DIR_KEEP_NESTED_GIT) && is_nonbare_repository_dir(path)) {
                if (!quiet) {
                        quote_path_relative(path->buf, prefix, &quoted);
                        printf(dry_run ?  _(msg_would_skip_git_dir) : _(msg_skip_git_dir),
                                        quoted.buf);
                }

                *dir_gone = 0;
                return 0;
        }

        dir = opendir(path->buf);
        if (!dir) {
                /* an empty dir could be removed even if it is unreadble */
                res = dry_run ? 0 : rmdir(path->buf);
                if (res) {
                        int saved_errno = errno;
                        quote_path_relative(path->buf, prefix, &quoted);
                        errno = saved_errno;
                        warning_errno(_(msg_warn_remove_failed), quoted.buf);
                        *dir_gone = 0;
                }
                return res;
        }

        strbuf_complete(path, '/');

        len = path->len;
        while ((e = readdir(dir)) != NULL) {
                struct stat st;
                if (is_dot_or_dotdot(e->d_name))
                        continue;

                strbuf_setlen(path, len);
                strbuf_addstr(path, e->d_name);
                if (lstat(path->buf, &st))
                        ; /* fall thru */
                else if (S_ISDIR(st.st_mode)) {
                        if (remove_dirs(path, prefix, force_flag, dry_run, quiet, &gone))
                                ret = 1;
                        if (gone) {
                                quote_path_relative(path->buf, prefix, &quoted);
                                string_list_append(&dels, quoted.buf);
                        } else
                                *dir_gone = 0;
                        continue;
                } else {
                        res = dry_run ? 0 : unlink(path->buf);
                        if (!res) {
                                quote_path_relative(path->buf, prefix, &quoted);
                                string_list_append(&dels, quoted.buf);
                        } else {
                                int saved_errno = errno;
                                quote_path_relative(path->buf, prefix, &quoted);
                                errno = saved_errno;
                                warning_errno(_(msg_warn_remove_failed), quoted.buf);
                                *dir_gone = 0;
                                ret = 1;
                        }
                        continue;
                }

                /* path too long, stat fails, or non-directory still exists */
                *dir_gone = 0;
                ret = 1;
                break;
        }
        closedir(dir);

        strbuf_setlen(path, original_len);

        if (*dir_gone) {
                res = dry_run ? 0 : rmdir(path->buf);
                if (!res)
                        *dir_gone = 1;
                else {
                        int saved_errno = errno;
                        quote_path_relative(path->buf, prefix, &quoted);
                        errno = saved_errno;
                        warning_errno(_(msg_warn_remove_failed), quoted.buf);
                        *dir_gone = 0;
                        ret = 1;
                }
        }

        if (!*dir_gone && !quiet) {
                int i;
                for (i = 0; i < dels.nr; i++)
                        printf(dry_run ?  _(msg_would_remove) : _(msg_remove), dels.items[i].string);
        }
        string_list_clear(&dels, 0);
        return ret;
}

static void pretty_print_dels(void)
{
        struct string_list list = STRING_LIST_INIT_DUP;
        struct string_list_item *item;
        struct strbuf buf = STRBUF_INIT;
        const char *qname;
        struct column_options copts;

        for_each_string_list_item(item, &del_list) {
                qname = quote_path_relative(item->string, NULL, &buf);
                string_list_append(&list, qname);
        }

        /*
         * always enable column display, we only consult column.*
         * about layout strategy and stuff
         */
        colopts = (colopts & ~COL_ENABLE_MASK) | COL_ENABLED;
        memset(&copts, 0, sizeof(copts));
        copts.indent = "  ";
        copts.padding = 2;
        print_columns(&list, colopts, &copts);
        strbuf_release(&buf);
        string_list_clear(&list, 0);
}

static void pretty_print_menus(struct string_list *menu_list)
{
        unsigned int local_colopts = 0;
        struct column_options copts;

        local_colopts = COL_ENABLED | COL_ROW;
        memset(&copts, 0, sizeof(copts));
        copts.indent = "  ";
        copts.padding = 2;
        print_columns(menu_list, local_colopts, &copts);
}

static void prompt_help_cmd(int singleton)
{
        clean_print_color(CLEAN_COLOR_HELP);
        printf(singleton ?
                  _("Prompt help:\n"
                    "1          - select a numbered item\n"
                    "foo        - select item based on unique prefix\n"
                    "           - (empty) select nothing\n") :
                  _("Prompt help:\n"
                    "1          - select a single item\n"
                    "3-5        - select a range of items\n"
                    "2-3,6-9    - select multiple ranges\n"
                    "foo        - select item based on unique prefix\n"
                    "-...       - unselect specified items\n"
                    "*          - choose all items\n"
                    "           - (empty) finish selecting\n"));
        clean_print_color(CLEAN_COLOR_RESET);
}

/*
 * display menu stuff with number prefix and hotkey highlight
 */
static void print_highlight_menu_stuff(struct menu_stuff *stuff, int **chosen)
{
        struct string_list menu_list = STRING_LIST_INIT_DUP;
        struct strbuf menu = STRBUF_INIT;
        struct menu_item *menu_item;
        struct string_list_item *string_list_item;
        int i;

        switch (stuff->type) {
        default:
                die("Bad type of menu_stuff when print menu");
        case MENU_STUFF_TYPE_MENU_ITEM:
                menu_item = (struct menu_item *)stuff->stuff;
                for (i = 0; i < stuff->nr; i++, menu_item++) {
                        const char *p;
                        int highlighted = 0;

                        p = menu_item->title;
                        if ((*chosen)[i] < 0)
                                (*chosen)[i] = menu_item->selected ? 1 : 0;
                        strbuf_addf(&menu, "%s%2d: ", (*chosen)[i] ? "*" : " ", i+1);
                        for (; *p; p++) {
                                if (!highlighted && *p == menu_item->hotkey) {
                                        strbuf_addstr(&menu, clean_get_color(CLEAN_COLOR_PROMPT));
                                        strbuf_addch(&menu, *p);
                                        strbuf_addstr(&menu, clean_get_color(CLEAN_COLOR_RESET));
                                        highlighted = 1;
                                } else {
                                        strbuf_addch(&menu, *p);
                                }
                        }
                        string_list_append(&menu_list, menu.buf);
                        strbuf_reset(&menu);
                }
                break;
        case MENU_STUFF_TYPE_STRING_LIST:
                i = 0;
                for_each_string_list_item(string_list_item, (struct string_list *)stuff->stuff) {
                        if ((*chosen)[i] < 0)
                                (*chosen)[i] = 0;
                        strbuf_addf(&menu, "%s%2d: %s",
                                    (*chosen)[i] ? "*" : " ", i+1, string_list_item->string);
                        string_list_append(&menu_list, menu.buf);
                        strbuf_reset(&menu);
                        i++;
                }
                break;
        }

        pretty_print_menus(&menu_list);

        strbuf_release(&menu);
        string_list_clear(&menu_list, 0);
}

static int find_unique(const char *choice, struct menu_stuff *menu_stuff)
{
        struct menu_item *menu_item;
        struct string_list_item *string_list_item;
        int i, len, found = 0;

        len = strlen(choice);
        switch (menu_stuff->type) {
        default:
                die("Bad type of menu_stuff when parse choice");
        case MENU_STUFF_TYPE_MENU_ITEM:

                menu_item = (struct menu_item *)menu_stuff->stuff;
                for (i = 0; i < menu_stuff->nr; i++, menu_item++) {
                        if (len == 1 && *choice == menu_item->hotkey) {
                                found = i + 1;
                                break;
                        }
                        if (!strncasecmp(choice, menu_item->title, len)) {
                                if (found) {
                                        if (len == 1) {
                                                /* continue for hotkey matching */
                                                found = -1;
                                        } else {
                                                found = 0;
                                                break;
                                        }
                                } else {
                                        found = i + 1;
                                }
                        }
                }
                break;
        case MENU_STUFF_TYPE_STRING_LIST:
                string_list_item = ((struct string_list *)menu_stuff->stuff)->items;
                for (i = 0; i < menu_stuff->nr; i++, string_list_item++) {
                        if (!strncasecmp(choice, string_list_item->string, len)) {
                                if (found) {
                                        found = 0;
                                        break;
                                }
                                found = i + 1;
                        }
                }
                break;
        }
        return found;
}


/*
 * Parse user input, and return choice(s) for menu (menu_stuff).
 *
 * Input
 *     (for single choice)
 *         1          - select a numbered item
 *         foo        - select item based on menu title
 *                    - (empty) select nothing
 *
 *     (for multiple choice)
 *         1          - select a single item
 *         3-5        - select a range of items
 *         2-3,6-9    - select multiple ranges
 *         foo        - select item based on menu title
 *         -...       - unselect specified items
 *         *          - choose all items
 *                    - (empty) finish selecting
 *
 * The parse result will be saved in array **chosen, and
 * return number of total selections.
 */
static int parse_choice(struct menu_stuff *menu_stuff,
                        int is_single,
                        struct strbuf input,
                        int **chosen)
{
        struct strbuf **choice_list, **ptr;
        int nr = 0;
        int i;

        if (is_single) {
                choice_list = strbuf_split_max(&input, '\n', 0);
        } else {
                char *p = input.buf;
                do {
                        if (*p == ',')
                                *p = ' ';
                } while (*p++);
                choice_list = strbuf_split_max(&input, ' ', 0);
        }

        for (ptr = choice_list; *ptr; ptr++) {
                char *p;
                int choose = 1;
                int bottom = 0, top = 0;
                int is_range, is_number;

                strbuf_trim(*ptr);
                if (!(*ptr)->len)
                        continue;

                /* Input that begins with '-'; unchoose */
                if (*(*ptr)->buf == '-') {
                        choose = 0;
                        strbuf_remove((*ptr), 0, 1);
                }

                is_range = 0;
                is_number = 1;
                for (p = (*ptr)->buf; *p; p++) {
                        if ('-' == *p) {
                                if (!is_range) {
                                        is_range = 1;
                                        is_number = 0;
                                } else {
                                        is_number = 0;
                                        is_range = 0;
                                        break;
                                }
                        } else if (!isdigit(*p)) {
                                is_number = 0;
                                is_range = 0;
                                break;
                        }
                }

                if (is_number) {
                        bottom = atoi((*ptr)->buf);
                        top = bottom;
                } else if (is_range) {
                        bottom = atoi((*ptr)->buf);
                        /* a range can be specified like 5-7 or 5- */
                        if (!*(strchr((*ptr)->buf, '-') + 1))
                                top = menu_stuff->nr;
                        else
                                top = atoi(strchr((*ptr)->buf, '-') + 1);
                } else if (!strcmp((*ptr)->buf, "*")) {
                        bottom = 1;
                        top = menu_stuff->nr;
                } else {
                        bottom = find_unique((*ptr)->buf, menu_stuff);
                        top = bottom;
                }

                if (top <= 0 || bottom <= 0 || top > menu_stuff->nr || bottom > top ||
                    (is_single && bottom != top)) {
                        clean_print_color(CLEAN_COLOR_ERROR);
                        printf(_("Huh (%s)?\n"), (*ptr)->buf);
                        clean_print_color(CLEAN_COLOR_RESET);
                        continue;
                }

                for (i = bottom; i <= top; i++)
                        (*chosen)[i-1] = choose;
        }

        strbuf_list_free(choice_list);

        for (i = 0; i < menu_stuff->nr; i++)
                nr += (*chosen)[i];
        return nr;
}

/*
 * Implement a git-add-interactive compatible UI, which is borrowed
 * from git-add--interactive.perl.
 *
 * Return value:
 *
 *   - Return an array of integers
 *   - , and it is up to you to free the allocated memory.
 *   - The array ends with EOF.
 *   - If user pressed CTRL-D (i.e. EOF), no selection returned.
 */
static int *list_and_choose(struct menu_opts *opts, struct menu_stuff *stuff)
{
        struct strbuf choice = STRBUF_INIT;
        int *chosen, *result;
        int nr = 0;
        int eof = 0;
        int i;

        ALLOC_ARRAY(chosen, stuff->nr);
        /* set chosen as uninitialized */
        for (i = 0; i < stuff->nr; i++)
                chosen[i] = -1;

        for (;;) {
                if (opts->header) {
                        printf_ln("%s%s%s",
                                  clean_get_color(CLEAN_COLOR_HEADER),
                                  _(opts->header),
                                  clean_get_color(CLEAN_COLOR_RESET));
                }

                /* chosen will be initialized by print_highlight_menu_stuff */
                print_highlight_menu_stuff(stuff, &chosen);

                if (opts->flags & MENU_OPTS_LIST_ONLY)
                        break;

                if (opts->prompt) {
                        printf("%s%s%s%s",
                               clean_get_color(CLEAN_COLOR_PROMPT),
                               _(opts->prompt),
                               opts->flags & MENU_OPTS_SINGLETON ? "> " : ">> ",
                               clean_get_color(CLEAN_COLOR_RESET));
                }

                if (strbuf_getline_lf(&choice, stdin) != EOF) {
                        strbuf_trim(&choice);
                } else {
                        eof = 1;
                        break;
                }

                /* help for prompt */
                if (!strcmp(choice.buf, "?")) {
                        prompt_help_cmd(opts->flags & MENU_OPTS_SINGLETON);
                        continue;
                }

                /* for a multiple-choice menu, press ENTER (empty) will return back */
                if (!(opts->flags & MENU_OPTS_SINGLETON) && !choice.len)
                        break;

                nr = parse_choice(stuff,
                                  opts->flags & MENU_OPTS_SINGLETON,
                                  choice,
                                  &chosen);

                if (opts->flags & MENU_OPTS_SINGLETON) {
                        if (nr)
                                break;
                } else if (opts->flags & MENU_OPTS_IMMEDIATE) {
                        break;
                }
        }

        if (eof) {
                result = xmalloc(sizeof(int));
                *result = EOF;
        } else {
                int j = 0;

                /*
                 * recalculate nr, if return back from menu directly with
                 * default selections.
                 */
                if (!nr) {
                        for (i = 0; i < stuff->nr; i++)
                                nr += chosen[i];
                }

                result = xcalloc(st_add(nr, 1), sizeof(int));
                for (i = 0; i < stuff->nr && j < nr; i++) {
                        if (chosen[i])
                                result[j++] = i;
                }
                result[j] = EOF;
        }

        free(chosen);
        strbuf_release(&choice);
        return result;
}

static int clean_cmd(void)
{
        return MENU_RETURN_NO_LOOP;
}

static int filter_by_patterns_cmd(void)
{
        struct dir_struct dir;
        struct strbuf confirm = STRBUF_INIT;
        struct strbuf **ignore_list;
        struct string_list_item *item;
        struct exclude_list *el;
        int changed = -1, i;

        for (;;) {
                if (!del_list.nr)
                        break;

                if (changed)
                        pretty_print_dels();

                clean_print_color(CLEAN_COLOR_PROMPT);
                printf(_("Input ignore patterns>> "));
                clean_print_color(CLEAN_COLOR_RESET);
                if (strbuf_getline_lf(&confirm, stdin) != EOF)
                        strbuf_trim(&confirm);
                else
                        putchar('\n');

                /* quit filter_by_pattern mode if press ENTER or Ctrl-D */
                if (!confirm.len)
                        break;

                memset(&dir, 0, sizeof(dir));
                el = add_exclude_list(&dir, EXC_CMDL, "manual exclude");
                ignore_list = strbuf_split_max(&confirm, ' ', 0);

                for (i = 0; ignore_list[i]; i++) {
                        strbuf_trim(ignore_list[i]);
                        if (!ignore_list[i]->len)
                                continue;

                        add_exclude(ignore_list[i]->buf, "", 0, el, -(i+1));
                }

                changed = 0;
                for_each_string_list_item(item, &del_list) {
                        int dtype = DT_UNKNOWN;

                        if (is_excluded(&dir, &the_index, item->string, &dtype)) {
                                *item->string = '\0';
                                changed++;
                        }
                }

                if (changed) {
                        string_list_remove_empty_items(&del_list, 0);
                } else {
                        clean_print_color(CLEAN_COLOR_ERROR);
                        printf_ln(_("WARNING: Cannot find items matched by: %s"), confirm.buf);
                        clean_print_color(CLEAN_COLOR_RESET);
                }

                strbuf_list_free(ignore_list);
                clear_directory(&dir);
        }

        strbuf_release(&confirm);
        return 0;
}

static int select_by_numbers_cmd(void)
{
        struct menu_opts menu_opts;
        struct menu_stuff menu_stuff;
        struct string_list_item *items;
        int *chosen;
        int i, j;

        menu_opts.header = NULL;
        menu_opts.prompt = N_("Select items to delete");
        menu_opts.flags = 0;

        menu_stuff.type = MENU_STUFF_TYPE_STRING_LIST;
        menu_stuff.stuff = &del_list;
        menu_stuff.nr = del_list.nr;

        chosen = list_and_choose(&menu_opts, &menu_stuff);
        items = del_list.items;
        for (i = 0, j = 0; i < del_list.nr; i++) {
                if (i < chosen[j]) {
                        *(items[i].string) = '\0';
                } else if (i == chosen[j]) {
                        /* delete selected item */
                        j++;
                        continue;
                } else {
                        /* end of chosen (chosen[j] == EOF), won't delete */
                        *(items[i].string) = '\0';
                }
        }

        string_list_remove_empty_items(&del_list, 0);

        free(chosen);
        return 0;
}

static int ask_each_cmd(void)
{
        struct strbuf confirm = STRBUF_INIT;
        struct strbuf buf = STRBUF_INIT;
        struct string_list_item *item;
        const char *qname;
        int changed = 0, eof = 0;

        for_each_string_list_item(item, &del_list) {
                /* Ctrl-D should stop removing files */
                if (!eof) {
                        qname = quote_path_relative(item->string, NULL, &buf);
                        /* TRANSLATORS: Make sure to keep [y/N] as is */
                        printf(_("Remove %s [y/N]? "), qname);
                        if (strbuf_getline_lf(&confirm, stdin) != EOF) {
                                strbuf_trim(&confirm);
                        } else {
                                putchar('\n');
                                eof = 1;
                        }
                }
                if (!confirm.len || strncasecmp(confirm.buf, "yes", confirm.len)) {
                        *item->string = '\0';
                        changed++;
                }
        }

        if (changed)
                string_list_remove_empty_items(&del_list, 0);

        strbuf_release(&buf);
        strbuf_release(&confirm);
        return MENU_RETURN_NO_LOOP;
}

static int quit_cmd(void)
{
        string_list_clear(&del_list, 0);
        printf(_("Bye.\n"));
        return MENU_RETURN_NO_LOOP;
}

static int help_cmd(void)
{
        clean_print_color(CLEAN_COLOR_HELP);
        printf_ln(_(
                    "clean               - start cleaning\n"
                    "filter by pattern   - exclude items from deletion\n"
                    "select by numbers   - select items to be deleted by numbers\n"
                    "ask each            - confirm each deletion (like \"rm -i\")\n"
                    "quit                - stop cleaning\n"
                    "help                - this screen\n"
                    "?                   - help for prompt selection"
                   ));
        clean_print_color(CLEAN_COLOR_RESET);
        return 0;
}

static void interactive_main_loop(void)
{
        while (del_list.nr) {
                struct menu_opts menu_opts;
                struct menu_stuff menu_stuff;
                struct menu_item menus[] = {
                        {'c', "clean",                  0, clean_cmd},
                        {'f', "filter by pattern",      0, filter_by_patterns_cmd},
                        {'s', "select by numbers",      0, select_by_numbers_cmd},
                        {'a', "ask each",               0, ask_each_cmd},
                        {'q', "quit",                   0, quit_cmd},
                        {'h', "help",                   0, help_cmd},
                };
                int *chosen;

                menu_opts.header = N_("*** Commands ***");
                menu_opts.prompt = N_("What now");
                menu_opts.flags = MENU_OPTS_SINGLETON;

                menu_stuff.type = MENU_STUFF_TYPE_MENU_ITEM;
                menu_stuff.stuff = menus;
                menu_stuff.nr = sizeof(menus) / sizeof(struct menu_item);

                clean_print_color(CLEAN_COLOR_HEADER);
                printf_ln(Q_("Would remove the following item:",
                             "Would remove the following items:",
                             del_list.nr));
                clean_print_color(CLEAN_COLOR_RESET);

                pretty_print_dels();

                chosen = list_and_choose(&menu_opts, &menu_stuff);

                if (*chosen != EOF) {
                        int ret;
                        ret = menus[*chosen].fn();
                        if (ret != MENU_RETURN_NO_LOOP) {
                                FREE_AND_NULL(chosen);
                                if (!del_list.nr) {
                                        clean_print_color(CLEAN_COLOR_ERROR);
                                        printf_ln(_("No more files to clean, exiting."));
                                        clean_print_color(CLEAN_COLOR_RESET);
                                        break;
                                }
                                continue;
                        }
                } else {
                        quit_cmd();
                }

                FREE_AND_NULL(chosen);
                break;
        }
}

static void correct_untracked_entries(struct dir_struct *dir)
{
        int src, dst, ign;

        for (src = dst = ign = 0; src < dir->nr; src++) {
                /* skip paths in ignored[] that cannot be inside entries[src] */
                while (ign < dir->ignored_nr &&
                       0 <= cmp_dir_entry(&dir->entries[src], &dir->ignored[ign]))
                        ign++;

                if (ign < dir->ignored_nr &&
                    check_dir_entry_contains(dir->entries[src], dir->ignored[ign])) {
                        /* entries[src] contains an ignored path, so we drop it */
                        free(dir->entries[src]);
                } else {
                        struct dir_entry *ent = dir->entries[src++];

                        /* entries[src] does not contain an ignored path, so we keep it */
                        dir->entries[dst++] = ent;

                        /* then discard paths in entries[] contained inside entries[src] */
                        while (src < dir->nr &&
                               check_dir_entry_contains(ent, dir->entries[src]))
                                free(dir->entries[src++]);

                        /* compensate for the outer loop's loop control */
                        src--;
                }
        }
        dir->nr = dst;
}

int cmd_clean(int argc, const char **argv, const char *prefix)
{
        int i, res;
        int dry_run = 0, remove_directories = 0, quiet = 0, ignored = 0;
        int ignored_only = 0, config_set = 0, errors = 0, gone = 1;
        int rm_flags = REMOVE_DIR_KEEP_NESTED_GIT;
        struct strbuf abs_path = STRBUF_INIT;
        struct dir_struct dir;
        struct pathspec pathspec;
        struct strbuf buf = STRBUF_INIT;
        struct string_list exclude_list = STRING_LIST_INIT_NODUP;
        struct exclude_list *el;
        struct string_list_item *item;
        const char *qname;
        struct option options[] = {
                OPT__QUIET(&quiet, N_("do not print names of files removed")),
                OPT__DRY_RUN(&dry_run, N_("dry run")),
                OPT__FORCE(&force, N_("force")),
                OPT_BOOL('i', "interactive", &interactive, N_("interactive cleaning")),
                OPT_BOOL('d', NULL, &remove_directories,
                                N_("remove whole directories")),
                { OPTION_CALLBACK, 'e', "exclude", &exclude_list, N_("pattern"),
                  N_("add <pattern> to ignore rules"), PARSE_OPT_NONEG, exclude_cb },
                OPT_BOOL('x', NULL, &ignored, N_("remove ignored files, too")),
                OPT_BOOL('X', NULL, &ignored_only,
                                N_("remove only ignored files")),
                OPT_END()
        };

        git_config(git_clean_config, NULL);
        if (force < 0)
                force = 0;
        else
                config_set = 1;

        argc = parse_options(argc, argv, prefix, options, builtin_clean_usage,
                             0);

        memset(&dir, 0, sizeof(dir));
        if (ignored_only)
                dir.flags |= DIR_SHOW_IGNORED;

        if (ignored && ignored_only)
                die(_("-x and -X cannot be used together"));

        if (!interactive && !dry_run && !force) {
                if (config_set)
                        die(_("clean.requireForce set to true and neither -i, -n, nor -f given; "
                                  "refusing to clean"));
                else
                        die(_("clean.requireForce defaults to true and neither -i, -n, nor -f given;"
                                  " refusing to clean"));
        }

        if (force > 1)
                rm_flags = 0;

        dir.flags |= DIR_SHOW_OTHER_DIRECTORIES;

        if (remove_directories)
                dir.flags |= DIR_SHOW_IGNORED_TOO | DIR_KEEP_UNTRACKED_CONTENTS;

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

        if (!ignored)
                setup_standard_excludes(&dir);

        el = add_exclude_list(&dir, EXC_CMDL, "--exclude option");
        for (i = 0; i < exclude_list.nr; i++)
                add_exclude(exclude_list.items[i].string, "", 0, el, -(i+1));

        parse_pathspec(&pathspec, 0,
                       PATHSPEC_PREFER_CWD,
                       prefix, argv);

        fill_directory(&dir, &the_index, &pathspec);
        correct_untracked_entries(&dir);

        for (i = 0; i < dir.nr; i++) {
                struct dir_entry *ent = dir.entries[i];
                int matches = 0;
                struct stat st;
                const char *rel;

                if (!cache_name_is_other(ent->name, ent->len))
                        continue;

                if (pathspec.nr)
                        matches = dir_path_match(ent, &pathspec, 0, NULL);

                if (pathspec.nr && !matches)
                        continue;

                if (lstat(ent->name, &st))
                        die_errno("Cannot lstat '%s'", ent->name);

                if (S_ISDIR(st.st_mode) && !remove_directories &&
                    matches != MATCHED_EXACTLY)
                        continue;

                rel = relative_path(ent->name, prefix, &buf);
                string_list_append(&del_list, rel);
        }

        for (i = 0; i < dir.nr; i++)
                free(dir.entries[i]);

        for (i = 0; i < dir.ignored_nr; i++)
                free(dir.ignored[i]);

        if (interactive && del_list.nr > 0)
                interactive_main_loop();

        for_each_string_list_item(item, &del_list) {
                struct stat st;

                if (prefix)
                        strbuf_addstr(&abs_path, prefix);

                strbuf_addstr(&abs_path, item->string);

                /*
                 * we might have removed this as part of earlier
                 * recursive directory removal, so lstat() here could
                 * fail with ENOENT.
                 */
                if (lstat(abs_path.buf, &st))
                        continue;

                if (S_ISDIR(st.st_mode)) {
                        if (remove_dirs(&abs_path, prefix, rm_flags, dry_run, quiet, &gone))
                                errors++;
                        if (gone && !quiet) {
                                qname = quote_path_relative(item->string, NULL, &buf);
                                printf(dry_run ? _(msg_would_remove) : _(msg_remove), qname);
                        }
                } else {
                        res = dry_run ? 0 : unlink(abs_path.buf);
                        if (res) {
                                int saved_errno = errno;
                                qname = quote_path_relative(item->string, NULL, &buf);
                                errno = saved_errno;
                                warning_errno(_(msg_warn_remove_failed), qname);
                                errors++;
                        } else if (!quiet) {
                                qname = quote_path_relative(item->string, NULL, &buf);
                                printf(dry_run ? _(msg_would_remove) : _(msg_remove), qname);
                        }
                }
                strbuf_reset(&abs_path);
        }

        strbuf_release(&abs_path);
        strbuf_release(&buf);
        string_list_clear(&del_list, 0);
        string_list_clear(&exclude_list, 0);
        return (errors != 0);
}