#include "builtin.h"
#include "cache.h"
#include "config.h"
#include "color.h"
#include "parse-options.h"
#include "urlmatch.h"
#include "quote.h"
#include "worktree.h"

static const char *const builtin_config_usage[] = {
        N_("git config [<options>]"),
        NULL
};

static char *key;
static regex_t *key_regexp;
static regex_t *regexp;
static int show_keys;
static int omit_values;
static int use_key_regexp;
static int do_all;
static int do_not_match;
static char delim = '=';
static char key_delim = ' ';
static char term = '\n';

static int use_global_config, use_system_config, use_local_config;
static int use_worktree_config;
static struct git_config_source given_config_source;
static int actions, type;
static char *default_value;
static int end_null;
static int respect_includes_opt = -1;
static struct config_options config_options;
static int show_origin;

#define ACTION_GET (1<<0)
#define ACTION_GET_ALL (1<<1)
#define ACTION_GET_REGEXP (1<<2)
#define ACTION_REPLACE_ALL (1<<3)
#define ACTION_ADD (1<<4)
#define ACTION_UNSET (1<<5)
#define ACTION_UNSET_ALL (1<<6)
#define ACTION_RENAME_SECTION (1<<7)
#define ACTION_REMOVE_SECTION (1<<8)
#define ACTION_LIST (1<<9)
#define ACTION_EDIT (1<<10)
#define ACTION_SET (1<<11)
#define ACTION_SET_ALL (1<<12)
#define ACTION_GET_COLOR (1<<13)
#define ACTION_GET_COLORBOOL (1<<14)
#define ACTION_GET_URLMATCH (1<<15)

/*
 * The actions "ACTION_LIST | ACTION_GET_*" which may produce more than
 * one line of output and which should therefore be paged.
 */
#define PAGING_ACTIONS (ACTION_LIST | ACTION_GET_ALL | \
                        ACTION_GET_REGEXP | ACTION_GET_URLMATCH)

#define TYPE_BOOL               1
#define TYPE_INT                2
#define TYPE_BOOL_OR_INT        3
#define TYPE_PATH               4
#define TYPE_EXPIRY_DATE        5
#define TYPE_COLOR              6

#define OPT_CALLBACK_VALUE(s, l, v, h, i) \
        { OPTION_CALLBACK, (s), (l), (v), NULL, (h), PARSE_OPT_NOARG | \
        PARSE_OPT_NONEG, option_parse_type, (i) }

static NORETURN void usage_builtin_config(void);

static int option_parse_type(const struct option *opt, const char *arg,
                             int unset)
{
        int new_type, *to_type;

        if (unset) {
                *((int *) opt->value) = 0;
                return 0;
        }

        /*
         * To support '--<type>' style flags, begin with new_type equal to
         * opt->defval.
         */
        new_type = opt->defval;
        if (!new_type) {
                if (!strcmp(arg, "bool"))
                        new_type = TYPE_BOOL;
                else if (!strcmp(arg, "int"))
                        new_type = TYPE_INT;
                else if (!strcmp(arg, "bool-or-int"))
                        new_type = TYPE_BOOL_OR_INT;
                else if (!strcmp(arg, "path"))
                        new_type = TYPE_PATH;
                else if (!strcmp(arg, "expiry-date"))
                        new_type = TYPE_EXPIRY_DATE;
                else if (!strcmp(arg, "color"))
                        new_type = TYPE_COLOR;
                else
                        die(_("unrecognized --type argument, %s"), arg);
        }

        to_type = opt->value;
        if (*to_type && *to_type != new_type) {
                /*
                 * Complain when there is a new type not equal to the old type.
                 * This allows for combinations like '--int --type=int' and
                 * '--type=int --type=int', but disallows ones like '--type=bool
                 * --int' and '--type=bool
                 * --type=int'.
                 */
                error(_("only one type at a time"));
                usage_builtin_config();
        }
        *to_type = new_type;

        return 0;
}

static struct option builtin_config_options[] = {
        OPT_GROUP(N_("Config file location")),
        OPT_BOOL(0, "global", &use_global_config, N_("use global config file")),
        OPT_BOOL(0, "system", &use_system_config, N_("use system config file")),
        OPT_BOOL(0, "local", &use_local_config, N_("use repository config file")),
        OPT_BOOL(0, "worktree", &use_worktree_config, N_("use per-worktree config file")),
        OPT_STRING('f', "file", &given_config_source.file, N_("file"), N_("use given config file")),
        OPT_STRING(0, "blob", &given_config_source.blob, N_("blob-id"), N_("read config from given blob object")),
        OPT_GROUP(N_("Action")),
        OPT_BIT(0, "get", &actions, N_("get value: name [value-regex]"), ACTION_GET),
        OPT_BIT(0, "get-all", &actions, N_("get all values: key [value-regex]"), ACTION_GET_ALL),
        OPT_BIT(0, "get-regexp", &actions, N_("get values for regexp: name-regex [value-regex]"), ACTION_GET_REGEXP),
        OPT_BIT(0, "get-urlmatch", &actions, N_("get value specific for the URL: section[.var] URL"), ACTION_GET_URLMATCH),
        OPT_BIT(0, "replace-all", &actions, N_("replace all matching variables: name value [value_regex]"), ACTION_REPLACE_ALL),
        OPT_BIT(0, "add", &actions, N_("add a new variable: name value"), ACTION_ADD),
        OPT_BIT(0, "unset", &actions, N_("remove a variable: name [value-regex]"), ACTION_UNSET),
        OPT_BIT(0, "unset-all", &actions, N_("remove all matches: name [value-regex]"), ACTION_UNSET_ALL),
        OPT_BIT(0, "rename-section", &actions, N_("rename section: old-name new-name"), ACTION_RENAME_SECTION),
        OPT_BIT(0, "remove-section", &actions, N_("remove a section: name"), ACTION_REMOVE_SECTION),
        OPT_BIT('l', "list", &actions, N_("list all"), ACTION_LIST),
        OPT_BIT('e', "edit", &actions, N_("open an editor"), ACTION_EDIT),
        OPT_BIT(0, "get-color", &actions, N_("find the color configured: slot [default]"), ACTION_GET_COLOR),
        OPT_BIT(0, "get-colorbool", &actions, N_("find the color setting: slot [stdout-is-tty]"), ACTION_GET_COLORBOOL),
        OPT_GROUP(N_("Type")),
        OPT_CALLBACK('t', "type", &type, "", N_("value is given this type"), option_parse_type),
        OPT_CALLBACK_VALUE(0, "bool", &type, N_("value is \"true\" or \"false\""), TYPE_BOOL),
        OPT_CALLBACK_VALUE(0, "int", &type, N_("value is decimal number"), TYPE_INT),
        OPT_CALLBACK_VALUE(0, "bool-or-int", &type, N_("value is --bool or --int"), TYPE_BOOL_OR_INT),
        OPT_CALLBACK_VALUE(0, "path", &type, N_("value is a path (file or directory name)"), TYPE_PATH),
        OPT_CALLBACK_VALUE(0, "expiry-date", &type, N_("value is an expiry date"), TYPE_EXPIRY_DATE),
        OPT_GROUP(N_("Other")),
        OPT_BOOL('z', "null", &end_null, N_("terminate values with NUL byte")),
        OPT_BOOL(0, "name-only", &omit_values, N_("show variable names only")),
        OPT_BOOL(0, "includes", &respect_includes_opt, N_("respect include directives on lookup")),
        OPT_BOOL(0, "show-origin", &show_origin, N_("show origin of config (file, standard input, blob, command line)")),
        OPT_STRING(0, "default", &default_value, N_("value"), N_("with --get, use default value when missing entry")),
        OPT_END(),
};

static NORETURN void usage_builtin_config(void)
{
        usage_with_options(builtin_config_usage, builtin_config_options);
}

static void check_argc(int argc, int min, int max) {
        if (argc >= min && argc <= max)
                return;
        if (min == max)
                error(_("wrong number of arguments, should be %d"), min);
        else
                error(_("wrong number of arguments, should be from %d to %d"),
                      min, max);
        usage_builtin_config();
}

static void show_config_origin(struct strbuf *buf)
{
        const char term = end_null ? '\0' : '\t';

        strbuf_addstr(buf, current_config_origin_type());
        strbuf_addch(buf, ':');
        if (end_null)
                strbuf_addstr(buf, current_config_name());
        else
                quote_c_style(current_config_name(), buf, NULL, 0);
        strbuf_addch(buf, term);
}

static int show_all_config(const char *key_, const char *value_, void *cb)
{
        if (show_origin) {
                struct strbuf buf = STRBUF_INIT;
                show_config_origin(&buf);
                /* Use fwrite as "buf" can contain \0's if "end_null" is set. */
                fwrite(buf.buf, 1, buf.len, stdout);
                strbuf_release(&buf);
        }
        if (!omit_values && value_)
                printf("%s%c%s%c", key_, delim, value_, term);
        else
                printf("%s%c", key_, term);
        return 0;
}

struct strbuf_list {
        struct strbuf *items;
        int nr;
        int alloc;
};

static int format_config(struct strbuf *buf, const char *key_, const char *value_)
{
        if (show_origin)
                show_config_origin(buf);
        if (show_keys)
                strbuf_addstr(buf, key_);
        if (!omit_values) {
                if (show_keys)
                        strbuf_addch(buf, key_delim);

                if (type == TYPE_INT)
                        strbuf_addf(buf, "%"PRId64,
                                    git_config_int64(key_, value_ ? value_ : ""));
                else if (type == TYPE_BOOL)
                        strbuf_addstr(buf, git_config_bool(key_, value_) ?
                                      "true" : "false");
                else if (type == TYPE_BOOL_OR_INT) {
                        int is_bool, v;
                        v = git_config_bool_or_int(key_, value_, &is_bool);
                        if (is_bool)
                                strbuf_addstr(buf, v ? "true" : "false");
                        else
                                strbuf_addf(buf, "%d", v);
                } else if (type == TYPE_PATH) {
                        const char *v;
                        if (git_config_pathname(&v, key_, value_) < 0)
                                return -1;
                        strbuf_addstr(buf, v);
                        free((char *)v);
                } else if (type == TYPE_EXPIRY_DATE) {
                        timestamp_t t;
                        if (git_config_expiry_date(&t, key_, value_) < 0)
                                return -1;
                        strbuf_addf(buf, "%"PRItime, t);
                } else if (type == TYPE_COLOR) {
                        char v[COLOR_MAXLEN];
                        if (git_config_color(v, key_, value_) < 0)
                                return -1;
                        strbuf_addstr(buf, v);
                } else if (value_) {
                        strbuf_addstr(buf, value_);
                } else {
                        /* Just show the key name; back out delimiter */
                        if (show_keys)
                                strbuf_setlen(buf, buf->len - 1);
                }
        }
        strbuf_addch(buf, term);
        return 0;
}

static int collect_config(const char *key_, const char *value_, void *cb)
{
        struct strbuf_list *values = cb;

        if (!use_key_regexp && strcmp(key_, key))
                return 0;
        if (use_key_regexp && regexec(key_regexp, key_, 0, NULL, 0))
                return 0;
        if (regexp != NULL &&
            (do_not_match ^ !!regexec(regexp, (value_?value_:""), 0, NULL, 0)))
                return 0;

        ALLOC_GROW(values->items, values->nr + 1, values->alloc);
        strbuf_init(&values->items[values->nr], 0);

        return format_config(&values->items[values->nr++], key_, value_);
}

static int get_value(const char *key_, const char *regex_)
{
        int ret = CONFIG_GENERIC_ERROR;
        struct strbuf_list values = {NULL};
        int i;

        if (use_key_regexp) {
                char *tl;

                /*
                 * NEEDSWORK: this naive pattern lowercasing obviously does not
                 * work for more complex patterns like "^[^.]*Foo.*bar".
                 * Perhaps we should deprecate this altogether someday.
                 */

                key = xstrdup(key_);
                for (tl = key + strlen(key) - 1;
                     tl >= key && *tl != '.';
                     tl--)
                        *tl = tolower(*tl);
                for (tl = key; *tl && *tl != '.'; tl++)
                        *tl = tolower(*tl);

                key_regexp = (regex_t*)xmalloc(sizeof(regex_t));
                if (regcomp(key_regexp, key, REG_EXTENDED)) {
                        error(_("invalid key pattern: %s"), key_);
                        FREE_AND_NULL(key_regexp);
                        ret = CONFIG_INVALID_PATTERN;
                        goto free_strings;
                }
        } else {
                if (git_config_parse_key(key_, &key, NULL)) {
                        ret = CONFIG_INVALID_KEY;
                        goto free_strings;
                }
        }

        if (regex_) {
                if (regex_[0] == '!') {
                        do_not_match = 1;
                        regex_++;
                }

                regexp = (regex_t*)xmalloc(sizeof(regex_t));
                if (regcomp(regexp, regex_, REG_EXTENDED)) {
                        error(_("invalid pattern: %s"), regex_);
                        FREE_AND_NULL(regexp);
                        ret = CONFIG_INVALID_PATTERN;
                        goto free_strings;
                }
        }

        config_with_options(collect_config, &values,
                            &given_config_source, &config_options);

        if (!values.nr && default_value) {
                struct strbuf *item;
                ALLOC_GROW(values.items, values.nr + 1, values.alloc);
                item = &values.items[values.nr++];
                strbuf_init(item, 0);
                if (format_config(item, key_, default_value) < 0)
                        die(_("failed to format default config value: %s"),
                                default_value);
        }

        ret = !values.nr;

        for (i = 0; i < values.nr; i++) {
                struct strbuf *buf = values.items + i;
                if (do_all || i == values.nr - 1)
                        fwrite(buf->buf, 1, buf->len, stdout);
                strbuf_release(buf);
        }
        free(values.items);

free_strings:
        free(key);
        if (key_regexp) {
                regfree(key_regexp);
                free(key_regexp);
        }
        if (regexp) {
                regfree(regexp);
                free(regexp);
        }

        return ret;
}

static char *normalize_value(const char *key, const char *value)
{
        if (!value)
                return NULL;

        if (type == 0 || type == TYPE_PATH || type == TYPE_EXPIRY_DATE)
                /*
                 * We don't do normalization for TYPE_PATH here: If
                 * the path is like ~/foobar/, we prefer to store
                 * "~/foobar/" in the config file, and to expand the ~
                 * when retrieving the value.
                 * Also don't do normalization for expiry dates.
                 */
                return xstrdup(value);
        if (type == TYPE_INT)
                return xstrfmt("%"PRId64, git_config_int64(key, value));
        if (type == TYPE_BOOL)
                return xstrdup(git_config_bool(key, value) ?  "true" : "false");
        if (type == TYPE_BOOL_OR_INT) {
                int is_bool, v;
                v = git_config_bool_or_int(key, value, &is_bool);
                if (!is_bool)
                        return xstrfmt("%d", v);
                else
                        return xstrdup(v ? "true" : "false");
        }
        if (type == TYPE_COLOR) {
                char v[COLOR_MAXLEN];
                if (git_config_color(v, key, value))
                        die(_("cannot parse color '%s'"), value);

                /*
                 * The contents of `v` now contain an ANSI escape
                 * sequence, not suitable for including within a
                 * configuration file. Treat the above as a
                 * "sanity-check", and return the given value, which we
                 * know is representable as valid color code.
                 */
                return xstrdup(value);
        }

        BUG("cannot normalize type %d", type);
}

static int get_color_found;
static const char *get_color_slot;
static const char *get_colorbool_slot;
static char parsed_color[COLOR_MAXLEN];

static int git_get_color_config(const char *var, const char *value, void *cb)
{
        if (!strcmp(var, get_color_slot)) {
                if (!value)
                        config_error_nonbool(var);
                if (color_parse(value, parsed_color) < 0)
                        return -1;
                get_color_found = 1;
        }
        return 0;
}

static void get_color(const char *var, const char *def_color)
{
        get_color_slot = var;
        get_color_found = 0;
        parsed_color[0] = '\0';
        config_with_options(git_get_color_config, NULL,
                            &given_config_source, &config_options);

        if (!get_color_found && def_color) {
                if (color_parse(def_color, parsed_color) < 0)
                        die(_("unable to parse default color value"));
        }

        fputs(parsed_color, stdout);
}

static int get_colorbool_found;
static int get_diff_color_found;
static int get_color_ui_found;
static int git_get_colorbool_config(const char *var, const char *value,
                void *cb)
{
        if (!strcmp(var, get_colorbool_slot))
                get_colorbool_found = git_config_colorbool(var, value);
        else if (!strcmp(var, "diff.color"))
                get_diff_color_found = git_config_colorbool(var, value);
        else if (!strcmp(var, "color.ui"))
                get_color_ui_found = git_config_colorbool(var, value);
        return 0;
}

static int get_colorbool(const char *var, int print)
{
        get_colorbool_slot = var;
        get_colorbool_found = -1;
        get_diff_color_found = -1;
        get_color_ui_found = -1;
        config_with_options(git_get_colorbool_config, NULL,
                            &given_config_source, &config_options);

        if (get_colorbool_found < 0) {
                if (!strcmp(get_colorbool_slot, "color.diff"))
                        get_colorbool_found = get_diff_color_found;
                if (get_colorbool_found < 0)
                        get_colorbool_found = get_color_ui_found;
        }

        if (get_colorbool_found < 0)
                /* default value if none found in config */
                get_colorbool_found = GIT_COLOR_AUTO;

        get_colorbool_found = want_color(get_colorbool_found);

        if (print) {
                printf("%s\n", get_colorbool_found ? "true" : "false");
                return 0;
        } else
                return get_colorbool_found ? 0 : 1;
}

static void check_write(void)
{
        if (!given_config_source.file && !startup_info->have_repository)
                die(_("not in a git directory"));

        if (given_config_source.use_stdin)
                die(_("writing to stdin is not supported"));

        if (given_config_source.blob)
                die(_("writing config blobs is not supported"));
}

struct urlmatch_current_candidate_value {
        char value_is_null;
        struct strbuf value;
};

static int urlmatch_collect_fn(const char *var, const char *value, void *cb)
{
        struct string_list *values = cb;
        struct string_list_item *item = string_list_insert(values, var);
        struct urlmatch_current_candidate_value *matched = item->util;

        if (!matched) {
                matched = xmalloc(sizeof(*matched));
                strbuf_init(&matched->value, 0);
                item->util = matched;
        } else {
                strbuf_reset(&matched->value);
        }

        if (value) {
                strbuf_addstr(&matched->value, value);
                matched->value_is_null = 0;
        } else {
                matched->value_is_null = 1;
        }
        return 0;
}

static int get_urlmatch(const char *var, const char *url)
{
        int ret;
        char *section_tail;
        struct string_list_item *item;
        struct urlmatch_config config = { STRING_LIST_INIT_DUP };
        struct string_list values = STRING_LIST_INIT_DUP;

        config.collect_fn = urlmatch_collect_fn;
        config.cascade_fn = NULL;
        config.cb = &values;

        if (!url_normalize(url, &config.url))
                die("%s", config.url.err);

        config.section = xstrdup_tolower(var);
        section_tail = strchr(config.section, '.');
        if (section_tail) {
                *section_tail = '\0';
                config.key = section_tail + 1;
                show_keys = 0;
        } else {
                config.key = NULL;
                show_keys = 1;
        }

        config_with_options(urlmatch_config_entry, &config,
                            &given_config_source, &config_options);

        ret = !values.nr;

        for_each_string_list_item(item, &values) {
                struct urlmatch_current_candidate_value *matched = item->util;
                struct strbuf buf = STRBUF_INIT;

                format_config(&buf, item->string,
                              matched->value_is_null ? NULL : matched->value.buf);
                fwrite(buf.buf, 1, buf.len, stdout);
                strbuf_release(&buf);

                strbuf_release(&matched->value);
        }
        string_list_clear(&config.vars, 1);
        string_list_clear(&values, 1);
        free(config.url.url);

        free((void *)config.section);
        return ret;
}

static char *default_user_config(void)
{
        struct strbuf buf = STRBUF_INIT;
        strbuf_addf(&buf,
                    _("# This is Git's per-user configuration file.\n"
                      "[user]\n"
                      "# Please adapt and uncomment the following lines:\n"
                      "#        name = %s\n"
                      "#        email = %s\n"),
                    ident_default_name(),
                    ident_default_email());
        return strbuf_detach(&buf, NULL);
}

int cmd_config(int argc, const char **argv, const char *prefix)
{
        int nongit = !startup_info->have_repository;
        char *value;

        given_config_source.file = getenv(CONFIG_ENVIRONMENT);

        argc = parse_options(argc, argv, prefix, builtin_config_options,
                             builtin_config_usage,
                             PARSE_OPT_STOP_AT_NON_OPTION);

        if (use_global_config + use_system_config + use_local_config +
            use_worktree_config +
            !!given_config_source.file + !!given_config_source.blob > 1) {
                error(_("only one config file at a time"));
                usage_builtin_config();
        }

        if (use_local_config && nongit)
                die(_("--local can only be used inside a git repository"));

        if (given_config_source.blob && nongit)
                die(_("--blob can only be used inside a git repository"));

        if (given_config_source.file &&
                        !strcmp(given_config_source.file, "-")) {
                given_config_source.file = NULL;
                given_config_source.use_stdin = 1;
        }

        if (use_global_config) {
                char *user_config = expand_user_path("~/.gitconfig", 0);
                char *xdg_config = xdg_config_home("config");

                if (!user_config)
                        /*
                         * It is unknown if HOME/.gitconfig exists, so
                         * we do not know if we should write to XDG
                         * location; error out even if XDG_CONFIG_HOME
                         * is set and points at a sane location.
                         */
                        die(_("$HOME not set"));

                if (access_or_warn(user_config, R_OK, 0) &&
                    xdg_config && !access_or_warn(xdg_config, R_OK, 0)) {
                        given_config_source.file = xdg_config;
                        free(user_config);
                } else {
                        given_config_source.file = user_config;
                        free(xdg_config);
                }
        }
        else if (use_system_config)
                given_config_source.file = git_etc_gitconfig();
        else if (use_local_config)
                given_config_source.file = git_pathdup("config");
        else if (use_worktree_config) {
                struct worktree **worktrees = get_worktrees(0);
                if (repository_format_worktree_config)
                        given_config_source.file = git_pathdup("config.worktree");
                else if (worktrees[0] && worktrees[1])
                        die(_("--worktree cannot be used with multiple "
                              "working trees unless the config\n"
                              "extension worktreeConfig is enabled. "
                              "Please read \"CONFIGURATION FILE\"\n"
                              "section in \"git help worktree\" for details"));
                else
                        given_config_source.file = git_pathdup("config");
                free_worktrees(worktrees);
        } else if (given_config_source.file) {
                if (!is_absolute_path(given_config_source.file) && prefix)
                        given_config_source.file =
                                prefix_filename(prefix, given_config_source.file);
        }

        if (respect_includes_opt == -1)
                config_options.respect_includes = !given_config_source.file;
        else
                config_options.respect_includes = respect_includes_opt;
        if (!nongit) {
                config_options.commondir = get_git_common_dir();
                config_options.git_dir = get_git_dir();
        }

        if (end_null) {
                term = '\0';
                delim = '\n';
                key_delim = '\n';
        }

        if ((actions & (ACTION_GET_COLOR|ACTION_GET_COLORBOOL)) && type) {
                error(_("--get-color and variable type are incoherent"));
                usage_builtin_config();
        }

        if (HAS_MULTI_BITS(actions)) {
                error(_("only one action at a time"));
                usage_builtin_config();
        }
        if (actions == 0)
                switch (argc) {
                case 1: actions = ACTION_GET; break;
                case 2: actions = ACTION_SET; break;
                case 3: actions = ACTION_SET_ALL; break;
                default:
                        usage_builtin_config();
                }
        if (omit_values &&
            !(actions == ACTION_LIST || actions == ACTION_GET_REGEXP)) {
                error(_("--name-only is only applicable to --list or --get-regexp"));
                usage_builtin_config();
        }

        if (show_origin && !(actions &
                (ACTION_GET|ACTION_GET_ALL|ACTION_GET_REGEXP|ACTION_LIST))) {
                error(_("--show-origin is only applicable to --get, --get-all, "
                        "--get-regexp, and --list"));
                usage_builtin_config();
        }

        if (default_value && !(actions & ACTION_GET)) {
                error(_("--default is only applicable to --get"));
                usage_builtin_config();
        }

        if (actions & PAGING_ACTIONS)
                setup_auto_pager("config", 1);

        if (actions == ACTION_LIST) {
                check_argc(argc, 0, 0);
                if (config_with_options(show_all_config, NULL,
                                        &given_config_source,
                                        &config_options) < 0) {
                        if (given_config_source.file)
                                die_errno(_("unable to read config file '%s'"),
                                          given_config_source.file);
                        else
                                die(_("error processing config file(s)"));
                }
        }
        else if (actions == ACTION_EDIT) {
                char *config_file;

                check_argc(argc, 0, 0);
                if (!given_config_source.file && nongit)
                        die(_("not in a git directory"));
                if (given_config_source.use_stdin)
                        die(_("editing stdin is not supported"));
                if (given_config_source.blob)
                        die(_("editing blobs is not supported"));
                git_config(git_default_config, NULL);
                config_file = given_config_source.file ?
                                xstrdup(given_config_source.file) :
                                git_pathdup("config");
                if (use_global_config) {
                        int fd = open(config_file, O_CREAT | O_EXCL | O_WRONLY, 0666);
                        if (fd >= 0) {
                                char *content = default_user_config();
                                write_str_in_full(fd, content);
                                free(content);
                                close(fd);
                        }
                        else if (errno != EEXIST)
                                die_errno(_("cannot create configuration file %s"), config_file);
                }
                launch_editor(config_file, NULL, NULL);
                free(config_file);
        }
        else if (actions == ACTION_SET) {
                int ret;
                check_write();
                check_argc(argc, 2, 2);
                value = normalize_value(argv[0], argv[1]);
                UNLEAK(value);
                ret = git_config_set_in_file_gently(given_config_source.file, argv[0], value);
                if (ret == CONFIG_NOTHING_SET)
                        error(_("cannot overwrite multiple values with a single value\n"
                        "       Use a regexp, --add or --replace-all to change %s."), argv[0]);
                return ret;
        }
        else if (actions == ACTION_SET_ALL) {
                check_write();
                check_argc(argc, 2, 3);
                value = normalize_value(argv[0], argv[1]);
                UNLEAK(value);
                return git_config_set_multivar_in_file_gently(given_config_source.file,
                                                              argv[0], value, argv[2], 0);
        }
        else if (actions == ACTION_ADD) {
                check_write();
                check_argc(argc, 2, 2);
                value = normalize_value(argv[0], argv[1]);
                UNLEAK(value);
                return git_config_set_multivar_in_file_gently(given_config_source.file,
                                                              argv[0], value,
                                                              CONFIG_REGEX_NONE, 0);
        }
        else if (actions == ACTION_REPLACE_ALL) {
                check_write();
                check_argc(argc, 2, 3);
                value = normalize_value(argv[0], argv[1]);
                UNLEAK(value);
                return git_config_set_multivar_in_file_gently(given_config_source.file,
                                                              argv[0], value, argv[2], 1);
        }
        else if (actions == ACTION_GET) {
                check_argc(argc, 1, 2);
                return get_value(argv[0], argv[1]);
        }
        else if (actions == ACTION_GET_ALL) {
                do_all = 1;
                check_argc(argc, 1, 2);
                return get_value(argv[0], argv[1]);
        }
        else if (actions == ACTION_GET_REGEXP) {
                show_keys = 1;
                use_key_regexp = 1;
                do_all = 1;
                check_argc(argc, 1, 2);
                return get_value(argv[0], argv[1]);
        }
        else if (actions == ACTION_GET_URLMATCH) {
                check_argc(argc, 2, 2);
                return get_urlmatch(argv[0], argv[1]);
        }
        else if (actions == ACTION_UNSET) {
                check_write();
                check_argc(argc, 1, 2);
                if (argc == 2)
                        return git_config_set_multivar_in_file_gently(given_config_source.file,
                                                                      argv[0], NULL, argv[1], 0);
                else
                        return git_config_set_in_file_gently(given_config_source.file,
                                                             argv[0], NULL);
        }
        else if (actions == ACTION_UNSET_ALL) {
                check_write();
                check_argc(argc, 1, 2);
                return git_config_set_multivar_in_file_gently(given_config_source.file,
                                                              argv[0], NULL, argv[1], 1);
        }
        else if (actions == ACTION_RENAME_SECTION) {
                int ret;
                check_write();
                check_argc(argc, 2, 2);
                ret = git_config_rename_section_in_file(given_config_source.file,
                                                        argv[0], argv[1]);
                if (ret < 0)
                        return ret;
                if (ret == 0)
                        die(_("no such section: %s"), argv[0]);
        }
        else if (actions == ACTION_REMOVE_SECTION) {
                int ret;
                check_write();
                check_argc(argc, 1, 1);
                ret = git_config_rename_section_in_file(given_config_source.file,
                                                        argv[0], NULL);
                if (ret < 0)
                        return ret;
                if (ret == 0)
                        die(_("no such section: %s"), argv[0]);
        }
        else if (actions == ACTION_GET_COLOR) {
                check_argc(argc, 1, 2);
                get_color(argv[0], argv[1]);
        }
        else if (actions == ACTION_GET_COLORBOOL) {
                check_argc(argc, 1, 2);
                if (argc == 2)
                        color_stdout_is_tty = git_config_bool("command line", argv[1]);
                return get_colorbool(argv[0], argc == 2);
        }

        return 0;
}