Setup the LINES/COLUMNS env vars before loading a view

[tig.git] / src / options.c

/* Copyright (c) 2006-2015 Jonas Fonseca <jonas.fonseca@gmail.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include "tig/tig.h"
#include "tig/types.h"
#include "tig/argv.h"
#include "tig/io.h"
#include "tig/repo.h"
#include "tig/refdb.h"
#include "tig/options.h"
#include "tig/request.h"
#include "tig/line.h"
#include "tig/keys.h"
#include "tig/view.h"

/*
 * Option variables.
 */

#define DEFINE_OPTION_VARIABLES(name, type, flags) type opt_##name;
OPTION_INFO(DEFINE_OPTION_VARIABLES)

static struct option_info option_info[] = {
#define DEFINE_OPTION_INFO(name, type, flags) { #name, STRING_SIZE(#name), #type, &opt_##name },
        OPTION_INFO(DEFINE_OPTION_INFO)
};

struct option_info *
find_option_info(struct option_info *option, size_t options, const char *prefix, const char *name)
{
        size_t namelen = strlen(name);
        char prefixed[SIZEOF_STR];
        int i;

        if (*prefix && namelen == strlen(prefix) &&
            !string_enum_compare(prefix, name, namelen)) {
                name = "display";
                namelen = strlen(name);
        }

        for (i = 0; i < options; i++) {
                if (!strcmp(option[i].type, "view_settings") &&
                    enum_equals_prefix(option[i], name, namelen))
                        return &option[i];

                if (enum_equals(option[i], name, namelen))
                        return &option[i];

                if (enum_name_prefixed(prefixed, sizeof(prefixed), prefix, option[i].name) &&
                    namelen == strlen(prefixed) &&
                    !string_enum_compare(prefixed, name, namelen))
                        return &option[i];
        }

        return NULL;
}

static struct option_info *
find_option_info_by_value(void *value)
{
        int i;

        for (i = 0; i < ARRAY_SIZE(option_info); i++)
                if (option_info[i].value == value)
                        return &option_info[i];

        return NULL;
}

static void
mark_option_seen(void *value)
{
        struct option_info *option = find_option_info_by_value(value);

        if (option)
                option->seen = true;
}

struct option_info *
find_column_option_info(enum view_column_type type, union view_column_options *opts,
                        const char *option, struct option_info *column_info,
                        const char **column_name)
{
#define DEFINE_COLUMN_OPTION_INFO(name, type, flags) \
        { #name, STRING_SIZE(#name), #type, &opt->name, flags },

#define DEFINE_COLUMN_OPTION_INFO_CHECK(name, id, options) \
        if (type == VIEW_COLUMN_##id) { \
                struct name##_options *opt = &opts->name; \
                struct option_info info[] = { \
                        options(DEFINE_COLUMN_OPTION_INFO) \
                }; \
                struct option_info *match; \
                match = find_option_info(info, ARRAY_SIZE(info), #name, option); \
                if (match) { \
                        *column_info = *match; \
                        *column_name = #name; \
                        return column_info; \
                } \
        }

        COLUMN_OPTIONS(DEFINE_COLUMN_OPTION_INFO_CHECK);

        *column_name = NULL;
        return NULL;
}

/*
 * State variables.
 */

iconv_t opt_iconv_out           = ICONV_NONE;
char opt_editor[SIZEOF_STR]     = "";
const char **opt_cmdline_argv   = NULL;
const char **opt_rev_argv       = NULL;
const char **opt_file_argv      = NULL;

/*
 * Mapping between options and command argument mapping.
 */

const char *
diff_context_arg()
{
        static char opt_diff_context_arg[9]     = "";

        if (opt_diff_context < 0 ||
            !string_format(opt_diff_context_arg, "-U%u", opt_diff_context))
                return "";

        return opt_diff_context_arg;
}

const char *
use_mailmap_arg()
{
        return opt_mailmap ? "--use-mailmap" : "";
}

const char *
log_custom_pretty_arg(void)
{
        return opt_mailmap
                ? "--pretty=format:commit %m %H %P%x00%aN <%aE> %ad%x00%s"
                : "--pretty=format:commit %m %H %P%x00%an <%ae> %ad%x00%s";
}

#define ENUM_ARG(enum_name, arg_string) ENUM_MAP_ENTRY(arg_string, enum_name)

static const struct enum_map_entry ignore_space_arg_map[] = {
        ENUM_ARG(IGNORE_SPACE_NO,       ""),
        ENUM_ARG(IGNORE_SPACE_ALL,      "--ignore-all-space"),
        ENUM_ARG(IGNORE_SPACE_SOME,     "--ignore-space-change"),
        ENUM_ARG(IGNORE_SPACE_AT_EOL,   "--ignore-space-at-eol"),
};

const char *
ignore_space_arg()
{
        return ignore_space_arg_map[opt_ignore_space].name;
}

static const struct enum_map_entry commit_order_arg_map[] = {
        ENUM_ARG(COMMIT_ORDER_AUTO,             ""),
        ENUM_ARG(COMMIT_ORDER_DEFAULT,          ""),
        ENUM_ARG(COMMIT_ORDER_TOPO,             "--topo-order"),
        ENUM_ARG(COMMIT_ORDER_DATE,             "--date-order"),
        ENUM_ARG(COMMIT_ORDER_AUTHOR_DATE,      "--author-date-order"),
        ENUM_ARG(COMMIT_ORDER_REVERSE,          "--reverse"),
};

const char *
commit_order_arg()
{
        return commit_order_arg_map[opt_commit_order].name;
}

const char *
commit_order_arg_with_graph(enum graph_display graph_display)
{
        enum commit_order commit_order = opt_commit_order;

        if (commit_order == COMMIT_ORDER_AUTO &&
            graph_display != GRAPH_DISPLAY_NO)
                commit_order = COMMIT_ORDER_TOPO;

        return commit_order_arg_map[commit_order].name;
}

/* Use --show-notes to support Git >= 1.7.6 */
#define NOTES_ARG       "--show-notes"
#define NOTES_EQ_ARG    NOTES_ARG "="

static char opt_notes_arg[SIZEOF_STR] = NOTES_ARG;

const char *
show_notes_arg()
{
        if (opt_show_notes)
                return opt_notes_arg;
        /* Notes are disabled by default when passing --pretty args. */
        return "";
}

void
update_options_from_argv(const char *argv[])
{
        int next, flags_pos;

        for (next = flags_pos = 0; argv[next]; next++) {
                const char *flag = argv[next];
                int value = -1;

                if (map_enum(&value, commit_order_arg_map, flag)) {
                        opt_commit_order = value;
                        mark_option_seen(&opt_commit_order);
                        continue;
                }

                if (map_enum(&value, ignore_space_arg_map, flag)) {
                        opt_ignore_space = value;
                        mark_option_seen(&opt_ignore_space);
                        continue;
                }

                if (!strcmp(flag, "--no-notes")) {
                        opt_show_notes = false;
                        mark_option_seen(&opt_show_notes);
                        continue;
                }

                if (!prefixcmp(flag, "--show-notes") ||
                    !prefixcmp(flag, "--notes")) {
                        opt_show_notes = true;
                        string_ncopy(opt_notes_arg, flag, strlen(flag));
                        mark_option_seen(&opt_show_notes);
                        continue;
                }

                if (!prefixcmp(flag, "-U")
                    && parse_int(&value, flag + 2, 0, 999999) == SUCCESS) {
                        opt_diff_context = value;
                        mark_option_seen(&opt_diff_context);
                        continue;
                }

                argv[flags_pos++] = flag;
        }

        argv[flags_pos] = NULL;
}

/*
 * User config file handling.
 */

static const struct enum_map_entry color_map[] = {
#define COLOR_MAP(name) ENUM_MAP_ENTRY(#name, COLOR_##name)
        COLOR_MAP(DEFAULT),
        COLOR_MAP(BLACK),
        COLOR_MAP(BLUE),
        COLOR_MAP(CYAN),
        COLOR_MAP(GREEN),
        COLOR_MAP(MAGENTA),
        COLOR_MAP(RED),
        COLOR_MAP(WHITE),
        COLOR_MAP(YELLOW),
};

static const struct enum_map_entry attr_map[] = {
#define ATTR_MAP(name) ENUM_MAP_ENTRY(#name, A_##name)
        ATTR_MAP(NORMAL),
        ATTR_MAP(BLINK),
        ATTR_MAP(BOLD),
        ATTR_MAP(DIM),
        ATTR_MAP(REVERSE),
        ATTR_MAP(STANDOUT),
        ATTR_MAP(UNDERLINE),
};

#define set_attribute(attr, name)       map_enum(attr, attr_map, name)

enum status_code
parse_step(double *opt, const char *arg)
{
        int value = atoi(arg);

        if (!value && !isdigit(*arg))
                return error("Invalid double or percentage");

        *opt = value;
        if (!strchr(arg, '%'))
                return SUCCESS;

        /* "Shift down" so 100% and 1 does not conflict. */
        *opt /= 100;
        if (*opt >= 1.0) {
                *opt = 0.99;
                return error("Percentage is larger than 100%%");
        }
        if (*opt < 0.0) {
                *opt = 1;
                return error("Percentage is less than 0%%");
        }
        return SUCCESS;
}

enum status_code
parse_int(int *opt, const char *arg, int min, int max)
{
        int value = atoi(arg);

        if (min <= value && value <= max) {
                *opt = value;
                return SUCCESS;
        }

        return error("Value must be between %d and %d", min, max);
}

static bool
set_color(int *color, const char *name)
{
        if (map_enum(color, color_map, name))
                return true;
        /* Git expects a plain int w/o prefix, however, color<int> is
         * the preferred Tig color notation.  */
        if (!prefixcmp(name, "color"))
                name += 5;
        return string_isnumber(name) &&
               parse_int(color, name, 0, 255) == SUCCESS;
}

#define is_quoted(c)    ((c) == '"' || (c) == '\'')

static enum status_code
parse_color_name(const char *color, struct line_rule *rule, const char **prefix_ptr)
{
        const char *prefixend = is_quoted(*color) ? NULL : strchr(color, '.');

        if (prefixend) {
                struct keymap *keymap = get_keymap(color, prefixend - color);

                if (!keymap)
                        return error("Unknown key map: %.*s", (int) (prefixend - color), color);
                if (prefix_ptr)
                        *prefix_ptr = keymap->name;
                color = prefixend + 1;
        }

        memset(rule, 0, sizeof(*rule));
        if (is_quoted(*color)) {
                rule->line = color + 1;
                rule->linelen = strlen(color) - 2;
        } else {
                rule->name = color;
                rule->namelen = strlen(color);
        }

        return SUCCESS;
}

static int
find_remapped(const char *remapped[][2], size_t remapped_size, const char *arg)
{
        size_t arglen = strlen(arg);
        int i;

        for (i = 0; i < remapped_size; i++) {
                const char *name = remapped[i][0];
                size_t namelen = strlen(name);

                if (arglen == namelen &&
                    !string_enum_compare(arg, name, namelen))
                        return i;
        }

        return -1;
}

/* Wants: object fgcolor bgcolor [attribute] */
static enum status_code
option_color_command(int argc, const char *argv[])
{
        struct line_rule rule = {0};
        const char *prefix = NULL;
        struct line_info *info;
        enum status_code code;

        if (argc < 3)
                return error("Invalid color mapping: color area fgcolor bgcolor [attrs]");

        code = parse_color_name(argv[0], &rule, &prefix);
        if (code != SUCCESS)
                return code;

        info = add_line_rule(prefix, &rule);
        if (!info) {
                static const char *obsolete[][2] = {
                        { "acked",                      "'    Acked-by'" },
                        { "diff-copy-from",             "'copy from '" },
                        { "diff-copy-to",               "'copy to '" },
                        { "diff-deleted-file-mode",     "'deleted file mode '" },
                        { "diff-dissimilarity",         "'dissimilarity '" },
                        { "diff-rename-from",           "'rename from '" },
                        { "diff-rename-to",             "'rename to '" },
                        { "diff-tree",                  "'diff-tree '" },
                        { "filename",                   "file" },
                        { "help-keymap",                "help.section" },
                        { "main-revgraph",              "" },
                        { "pp-adate",                   "'AuthorDate: '" },
                        { "pp-author",                  "'Author: '" },
                        { "pp-cdate",                   "'CommitDate: '" },
                        { "pp-commit",                  "'Commit: '" },
                        { "pp-date",                    "'Date: '" },
                        { "reviewed",                   "'    Reviewed-by'" },
                        { "signoff",                    "'    Signed-off-by'" },
                        { "stat-head",                  "status.header" },
                        { "stat-section",               "status.section" },
                        { "tested",                     "'    Tested-by'" },
                        { "tree-dir",                   "tree.directory" },
                        { "tree-file",                  "tree.file" },
                        { "tree-head",                  "tree.header" },
                };
                int index;

                index = find_remapped(obsolete, ARRAY_SIZE(obsolete), rule.name);
                if (index != -1) {
                        if (!*obsolete[index][1])
                                return error("%s is obsolete", argv[0]);
                        /* Keep the initial prefix if defined. */
                        code = parse_color_name(obsolete[index][1], &rule, prefix ? NULL : &prefix);
                        if (code != SUCCESS)
                                return code;
                        info = add_line_rule(prefix, &rule);
                }

                if (!info)
                        return error("Unknown color name: %s", argv[0]);

                code = error("%s has been replaced by %s",
                             obsolete[index][0], obsolete[index][1]);
        }

        if (!set_color(&info->fg, argv[1]))
                return error("Unknown color: %s", argv[1]);

        if (!set_color(&info->bg, argv[2]))
                return error("Unknown color: %s", argv[2]);

        info->attr = 0;
        while (argc-- > 3) {
                int attr;

                if (!set_attribute(&attr, argv[argc]))
                        return error("Unknown color attribute: %s", argv[argc]);
                info->attr |= attr;
        }

        return code;
}

static enum status_code
parse_bool(bool *opt, const char *arg)
{
        *opt = (!strcmp(arg, "1") || !strcmp(arg, "true") || !strcmp(arg, "yes"))
                ? true : false;
        if (*opt || !strcmp(arg, "0") || !strcmp(arg, "false") || !strcmp(arg, "no"))
                return SUCCESS;
        return error("Non-boolean value treated as false: %s", arg);
}

static enum status_code
parse_enum(const char *name, unsigned int *opt, const char *arg,
           const struct enum_map *map)
{
        bool is_true;
        enum status_code code;

        assert(map->size > 1);

        if (map_enum_do(map->entries, map->size, (int *) opt, arg))
                return SUCCESS;

        code = parse_bool(&is_true, arg);
        *opt = is_true ? map->entries[1].value : map->entries[0].value;
        if (code == SUCCESS)
                return code;
        return error("'%s' is not a valid value for %s; using %s",
                     arg, name, enum_name(map->entries[*opt].name));
}

static enum status_code
parse_string(char *opt, const char *arg, size_t optsize)
{
        int arglen = strlen(arg);

        switch (arg[0]) {
        case '\"':
        case '\'':
                if (arglen == 1 || arg[arglen - 1] != arg[0])
                        return ERROR_UNMATCHED_QUOTATION;
                arg += 1; arglen -= 2;
        default:
                string_ncopy_do(opt, optsize, arg, arglen);
                return SUCCESS;
        }
}

static enum status_code
parse_encoding(struct encoding **encoding_ref, const char *arg, bool priority)
{
        char buf[SIZEOF_STR];
        enum status_code code = parse_string(buf, arg, sizeof(buf));

        if (code == SUCCESS) {
                struct encoding *encoding = *encoding_ref;

                if (encoding && !priority)
                        return code;
                encoding = encoding_open(buf);
                if (encoding)
                        *encoding_ref = encoding;
        }

        return code;
}

static enum status_code
parse_args(const char ***args, const char *argv[])
{
        if (!argv_copy(args, argv))
                return ERROR_OUT_OF_MEMORY;
        return SUCCESS;
}

enum status_code
parse_option(struct option_info *option, const char *prefix, const char *arg)
{
        char name[SIZEOF_STR];

        if (!enum_name_prefixed(name, sizeof(name), prefix, option->name))
                return error("Failed to parse option");

        if (!strcmp("show-notes", name)) {
                bool *value = option->value;
                enum status_code res;

                if (parse_bool(option->value, arg) == SUCCESS)
                        return SUCCESS;

                *value = true;
                string_copy(opt_notes_arg, NOTES_EQ_ARG);
                res = parse_string(opt_notes_arg + STRING_SIZE(NOTES_EQ_ARG), arg,
                                   sizeof(opt_notes_arg) - STRING_SIZE(NOTES_EQ_ARG));
                if (res == SUCCESS && !opt_notes_arg[STRING_SIZE(NOTES_EQ_ARG)])
                        opt_notes_arg[STRING_SIZE(NOTES_ARG)] = 0;
                return res;
        }

        if (!strcmp(option->type, "bool"))
                return parse_bool(option->value, arg);

        if (!strcmp(option->type, "double"))
                return parse_step(option->value, arg);

        if (!strncmp(option->type, "enum", 4)) {
                const char *type = option->type + STRING_SIZE("enum ");
                const struct enum_map *map = find_enum_map(type);

                return parse_enum(name, option->value, arg, map);
        }

        if (!strcmp(option->type, "int")) {
                if (strstr(name, "title-overflow")) {
                        bool enabled = false;
                        int *value = option->value;

                        /* We try to parse it as a boolean (and set the
                         * value to 0 if fale), otherwise we parse it as
                         * an integer and use the given value. */
                        if (parse_bool(&enabled, arg) == SUCCESS) {
                                if (!enabled) {
                                        *value = 0;
                                        return SUCCESS;
                                }
                                arg = "50";
                        }
                }

                if (!strcmp(name, "line-number-interval") ||
                    !strcmp(name, "tab-size"))
                        return parse_int(option->value, arg, 1, 1024);
                else if (!strcmp(name, "id-width"))
                        return parse_int(option->value, arg, 0, SIZEOF_REV - 1);
                else
                        return parse_int(option->value, arg, 0, 1024);
        }

        return error("Unhandled option: %s", name);
}

static enum status_code
parse_view_settings(struct view_column **view_column, const char *name_, const char *argv[])
{
        char buf[SIZEOF_STR];
        const char *name = enum_name_copy(buf, sizeof(buf), name_) ? buf : name_;
        const char *prefixed;

        if ((prefixed = strstr(name, "-view-"))) {
                const char *column_name = prefixed + STRING_SIZE("-view-");
                size_t column_namelen = strlen(column_name);
                enum view_column_type type;

                for (type = 0; type < view_column_type_map->size; type++) {
                        const struct enum_map_entry *column = &view_column_type_map->entries[type];

                        if (enum_equals(*column, column_name, column_namelen))
                                return parse_view_column_config(name, type, NULL, argv);

                        if (enum_equals_prefix(*column, column_name, column_namelen))
                                return parse_view_column_config(name, type,
                                                                column_name + column->namelen + 1,
                                                                argv);
                }
        }

        return parse_view_config(view_column, name, argv);
}

/* Wants: name = value */
static enum status_code
option_set_command(int argc, const char *argv[])
{
        struct option_info *option;
        enum status_code code;

        if (argc < 2)
                return error("Invalid set command: set option = value");

        if (strcmp(argv[1], "="))
                return error("No value assigned to %s", argv[0]);

        option = find_option_info(option_info, ARRAY_SIZE(option_info), "", argv[0]);
        if (option) {
                if (option->seen)
                        return SUCCESS;

                if (!strcmp(option->type, "const char **"))
                        return parse_args(option->value, argv + 2);

                if (argc < 3)
                        return error("Invalid set command: set option = value");

                if (!strcmp(option->type, "view_settings"))
                        return parse_view_settings(option->value, argv[0], argv + 2);

                if (!strcmp(option->type, "struct ref_format **"))
                        return parse_ref_formats(option->value, argv + 2);

                code = parse_option(option, "", argv[2]);
                if (code == SUCCESS && argc != 3)
                        return error("Option %s only takes one value", argv[0]);

                return code;

        }

        {
                const char *obsolete[][2] = {
                        { "author-width",               "author" },
                        { "filename-width",             "file-name" },
                        { "line-number-interval",       "line-number" },
                        { "show-author",                "author" },
                        { "show-date",                  "date" },
                        { "show-file-size",             "file-size" },
                        { "show-filename",              "file-name" },
                        { "show-id",                    "id" },
                        { "show-line-numbers",          "line-number" },
                        { "show-refs",                  "commit-title" },
                        { "show-rev-graph",             "commit-title" },
                        { "title-overflow",             "commit-title and text" },
                };
                int index = find_remapped(obsolete, ARRAY_SIZE(obsolete), argv[0]);

                if (index != -1)
                        return error("%s is obsolete; see tigrc(5) for how to set the %s column option",
                                     obsolete[index][0], obsolete[index][1]);

                if (!strcmp(argv[0], "read-git-colors"))
                        return error("read-git-colors has been obsoleted by the git-colors option");
        }

        return error("Unknown option name: %s", argv[0]);
}

/* Wants: mode request key */
static enum status_code
option_bind_command(int argc, const char *argv[])
{
        struct key key[16];
        size_t keys = 0;
        enum request request;
        struct keymap *keymap;
        const char *key_arg;

        if (argc < 3)
                return error("Invalid key binding: bind keymap key action");

        if (!(keymap = get_keymap(argv[0], strlen(argv[0])))) {
                if (!strcmp(argv[0], "branch"))
                        keymap = get_keymap("refs", strlen("refs"));
                if (!keymap)
                        return error("Unknown key map: %s", argv[0]);
        }

        for (keys = 0, key_arg = argv[1]; *key_arg && keys < ARRAY_SIZE(key); keys++) {
                enum status_code code = get_key_value(&key_arg, &key[keys]);

                if (code != SUCCESS)
                        return code;
        }

        if (*key_arg && keys == ARRAY_SIZE(key))
                return error("Except for <Esc> combos only one key is allowed "
                             "in key combos: %s", argv[1]);

        request = get_request(argv[2]);
        if (request == REQ_UNKNOWN) {
                static const char *obsolete[][2] = {
                        { "view-branch",                "view-refs" },
                };
                static const char *toggles[][2] = {
                        { "diff-context-down",          "diff-context" },
                        { "diff-context-up",            "diff-context" },
                        { "stage-next",                 ":/^@@" },
                        { "toggle-author",              "author" },
                        { "toggle-changes",             "show-changes" },
                        { "toggle-commit-order",        "show-commit-order" },
                        { "toggle-date",                "date" },
                        { "toggle-files",               "file-filter" },
                        { "toggle-file-filter",         "file-filter" },
                        { "toggle-file-size",           "file-size" },
                        { "toggle-filename",            "filename" },
                        { "toggle-graphic",             "show-graphic" },
                        { "toggle-id",                  "id" },
                        { "toggle-ignore-space",        "show-ignore-space" },
                        { "toggle-lineno",              "line-number" },
                        { "toggle-refs",                "commit-title-refs" },
                        { "toggle-rev-graph",           "commit-title-graph" },
                        { "toggle-show-changes",        "show-changes" },
                        { "toggle-sort-field",          "sort-field" },
                        { "toggle-sort-order",          "sort-order" },
                        { "toggle-title-overflow",      "commit-title-overflow" },
                        { "toggle-untracked-dirs",      "status-untracked-dirs" },
                        { "toggle-vertical-split",      "show-vertical-split" },
                };
                int alias;

                alias = find_remapped(obsolete, ARRAY_SIZE(obsolete), argv[2]);
                if (alias != -1) {
                        const char *action = obsolete[alias][1];

                        add_keybinding(keymap, get_request(action), key, keys);
                        return error("%s has been renamed to %s",
                                     obsolete[alias][0], action);
                }

                alias = find_remapped(toggles, ARRAY_SIZE(toggles), argv[2]);
                if (alias != -1) {
                        const char *action = toggles[alias][0];
                        const char *arg = prefixcmp(action, "diff-context-")
                                        ? NULL : (strstr(action, "-down") ? "-1" : "+1");
                        const char *mapped = toggles[alias][1];
                        const char *toggle[] = { ":toggle", mapped, arg, NULL};
                        const char *other[] = { mapped, NULL };
                        const char **prompt = *mapped == ':' ? other : toggle;
                        enum status_code code = add_run_request(keymap, key, keys, prompt);

                        if (code == SUCCESS)
                                code = error("%s has been replaced by `%s%s%s%s'",
                                             action, prompt == other ? mapped : ":toggle ",
                                             prompt == other ? "" : mapped,
                                             arg ? " " : "", arg ? arg : "");
                        return code;
                }
        }

        if (request == REQ_UNKNOWN)
                return add_run_request(keymap, key, keys, argv + 2);

        return add_keybinding(keymap, request, key, keys);
}


static enum status_code load_option_file(const char *path);

static enum status_code
option_source_command(int argc, const char *argv[])
{
        enum status_code code;

        if (argc < 1)
                return error("Invalid source command: source path");

        code = load_option_file(argv[0]);

        return code == ERROR_FILE_DOES_NOT_EXIST
                ? error("File does not exist: %s", argv[0]) : code;
}

enum status_code
set_option(const char *opt, int argc, const char *argv[])
{
        if (!strcmp(opt, "color"))
                return option_color_command(argc, argv);

        if (!strcmp(opt, "set"))
                return option_set_command(argc, argv);

        if (!strcmp(opt, "bind"))
                return option_bind_command(argc, argv);

        if (!strcmp(opt, "source"))
                return option_source_command(argc, argv);

        return error("Unknown option command: %s", opt);
}

struct config_state {
        const char *path;
        size_t lineno;
        bool errors;
};

static enum status_code
read_option(char *opt, size_t optlen, char *value, size_t valuelen, void *data)
{
        struct config_state *config = data;
        enum status_code status = ERROR_NO_OPTION_VALUE;

        /* Check for comment markers, since read_properties() will
         * only ensure opt and value are split at first " \t". */
        optlen = strcspn(opt, "#");
        if (optlen == 0)
                return SUCCESS;

        if (opt[optlen] == 0) {
                /* Look for comment endings in the value. */
                size_t len = strcspn(value, "#");
                const char *argv[SIZEOF_ARG];
                int argc = 0;

                if (len < valuelen) {
                        valuelen = len;
                        value[valuelen] = 0;
                }

                if (!argv_from_string(argv, &argc, value))
                        status = error("Too many option arguments for %s", opt);
                else
                        status = set_option(opt, argc, argv);
        }

        if (status != SUCCESS) {
                warn("%s:%zu: %s", config->path, config->lineno,
                     get_status_message(status));
                config->errors = true;
        }

        /* Always keep going if errors are encountered. */
        return SUCCESS;
}

static enum status_code
load_option_file(const char *path)
{
        struct config_state config = { path, 0, false };
        struct io io;
        char buf[SIZEOF_STR];

        /* Do not read configuration from stdin if set to "" */
        if (!path || !strlen(path))
                return SUCCESS;

        if (!prefixcmp(path, "~/")) {
                const char *home = getenv("HOME");

                if (!home || !string_format(buf, "%s/%s", home, path + 2))
                        return error("Failed to expand ~ to user home directory");
                path = buf;
        }

        /* It's OK that the file doesn't exist. */
        if (!io_open(&io, "%s", path)) {
                /* XXX: Must return ERROR_FILE_DOES_NOT_EXIST so missing
                 * system tigrc is detected properly. */
                if (io_error(&io) == ENOENT)
                        return ERROR_FILE_DOES_NOT_EXIST;
                return error("Error loading file %s: %s", path, io_strerror(&io));
        }

        if (io_load_span(&io, " \t", &config.lineno, read_option, &config) != SUCCESS ||
            config.errors == true)
                warn("Errors while loading %s.", path);
        return SUCCESS;
}

extern const char *builtin_config;

enum status_code
load_options(void)
{
        const char *tigrc_user = getenv("TIGRC_USER");
        const char *tigrc_system = getenv("TIGRC_SYSTEM");
        const char *tig_diff_opts = getenv("TIG_DIFF_OPTS");
        const bool diff_opts_from_args = !!opt_diff_options;
        bool custom_tigrc_system = !!tigrc_system;

        opt_file_filter = true;
        if (!find_option_info_by_value(&opt_diff_context)->seen)
                opt_diff_context = -3;

        if (!custom_tigrc_system)
                tigrc_system = SYSCONFDIR "/tigrc";

        if (!*tigrc_system ||
            (load_option_file(tigrc_system) == ERROR_FILE_DOES_NOT_EXIST && !custom_tigrc_system)) {
                struct config_state config = { "<built-in>", 0, false };
                struct io io;

                if (!io_from_string(&io, builtin_config))
                        return error("Failed to get built-in config");
                if (io_load_span(&io, " \t", &config.lineno, read_option, &config) != SUCCESS || config.errors == true)
                        return error("Error in built-in config");
        }

        if (!tigrc_user)
                tigrc_user = "~/.tigrc";
        load_option_file(tigrc_user);

        if (!diff_opts_from_args && tig_diff_opts && *tig_diff_opts) {
                static const char *diff_opts[SIZEOF_ARG] = { NULL };
                char buf[SIZEOF_STR];
                int argc = 0;

                if (!string_format(buf, "%s", tig_diff_opts) ||
                    !argv_from_string(diff_opts, &argc, buf))
                        return error("TIG_DIFF_OPTS contains too many arguments");
                else if (!argv_copy(&opt_diff_options, diff_opts))
                        return error("Failed to format TIG_DIFF_OPTS arguments");
        }

        return SUCCESS;
}

const char *
format_option_value(const struct option_info *option, char buf[], size_t bufsize)
{
        buf[0] = 0;

        if (!strcmp(option->type, "bool")) {
                bool *opt = option->value;

                if (string_nformat(buf, bufsize, NULL, "%s", *opt ? "yes" : "no"))
                        return buf;

        } else if (!strncmp(option->type, "enum", 4)) {
                const char *type = option->type + STRING_SIZE("enum ");
                enum author *opt = option->value;
                const struct enum_map *map = find_enum_map(type);

                if (enum_name_copy(buf, bufsize, map->entries[*opt].name))
                        return buf;

        } else if (!strcmp(option->type, "int")) {
                int *opt = option->value;

                if (opt == &opt_diff_context && *opt < 0)
                        *opt = -*opt;

                if (string_nformat(buf, bufsize, NULL, "%d", *opt))
                        return buf;

        } else if (!strcmp(option->type, "double")) {
                double *opt = option->value;

                if (*opt >= 1) {
                        if (string_nformat(buf, bufsize, NULL, "%d", (int) *opt))
                                return buf;

                } else if (string_nformat(buf, bufsize, NULL, "%.0f%%", (*opt) * 100)) {
                        return buf;
                }

        } else if (!strcmp(option->type, "const char **")) {
                const char *sep = "";
                const char ***opt = option->value;
                size_t bufpos = 0;
                int i;

                for (i = 0; (*opt) && (*opt)[i]; i++) {
                        const char *arg = (*opt)[i];

                        if (!string_nformat(buf, bufsize, &bufpos, "%s%s", sep, arg))
                                return NULL;

                        sep = " ";
                }

                return buf;

        } else if (!strcmp(option->type, "struct ref_format **")) {
                struct ref_format ***opt = option->value;

                if (format_ref_formats(*opt, buf, bufsize) == SUCCESS)
                        return buf;

        } else if (!strcmp(option->type, "view_settings")) {
                struct view_column **opt = option->value;

                if (format_view_config(*opt, buf, bufsize) == SUCCESS)
                        return buf;

        } else {
                if (string_nformat(buf, bufsize, NULL, "<%s>", option->type))
                        return buf;
        }

        return NULL;
}

static bool
save_option_settings(FILE *file)
{
        char buf[SIZEOF_STR];
        int i;

        if (!io_fprintf(file, "%s", "\n## Settings\n"))
                return false;

        for (i = 0; i < ARRAY_SIZE(option_info); i++) {
                struct option_info *option = &option_info[i];
                const char *name = enum_name(option->name);
                const char *value = format_option_value(option, buf, sizeof(buf));

                if (!suffixcmp(name, strlen(name), "-args"))
                        continue;

                if (!io_fprintf(file, "\nset %-25s = %s", name, value))
                        return false;
        }

        return true;
}

static bool
save_option_keybinding(void *data, const char *group, struct keymap *keymap,
                       enum request request, const char *key,
                       const struct request_info *req_info,
                       const struct run_request *run_req)
{
        FILE *file = data;

        if (group && !io_fprintf(file, "\n# %s", group))
                return false;

        if (!io_fprintf(file, "\nbind %-10s %-15s ", enum_name(keymap->name), key))
                return false;

        if (req_info) {
                return io_fprintf(file, "%s", enum_name(req_info->name));

        } else {
                const char *sep = format_run_request_flags(run_req);
                int i;

                for (i = 0; run_req->argv[i]; i++) {
                        if (!io_fprintf(file, "%s%s", sep, run_req->argv[i]))
                                return false;
                        sep = " ";
                }

                return true;
        }
}

static bool
save_option_keybindings(FILE *file)
{
        if (!io_fprintf(file, "%s", "\n\n## Keybindings\n"))
                return false;

        return foreach_key(save_option_keybinding, file, false);
}

static bool
save_option_color_name(FILE *file, int color)
{
        int i;

        for (i = 0; i < ARRAY_SIZE(color_map); i++)
                if (color_map[i].value == color)
                        return io_fprintf(file, " %-8s", enum_name(color_map[i].name));

        return io_fprintf(file, " color%d", color);
}

static bool
save_option_color_attr(FILE *file, int attr)
{
        int i;

        for (i = 0; i < ARRAY_SIZE(attr_map); i++)
                if ((attr & attr_map[i].value) &&
                    !io_fprintf(file, " %s", enum_name(attr_map[i].name)))
                        return false;

        return true;
}

static bool
save_option_color(void *data, const struct line_rule *rule)
{
        FILE *file = data;
        const struct line_info *info;

        for (info = &rule->info; info; info = info->next) {
                const char *prefix = info->prefix ? info->prefix : "";
                const char *prefix_sep = info->prefix ? "." : "";
                const char *quote = *rule->line ? "\"" : "";
                const char *name = *rule->line ? rule->line : enum_name(rule->name);
                int name_width = strlen(prefix) + strlen(prefix_sep) + 2 * strlen(quote) + strlen(name);
                int padding = name_width > 30 ? 0 : 30 - name_width;

                if (!io_fprintf(file, "\ncolor %s%s%s%s%s%-*s",
                                      prefix, prefix_sep, quote, name, quote, padding, "")
                    || !save_option_color_name(file, info->fg)
                    || !save_option_color_name(file, info->bg)
                    || !save_option_color_attr(file, info->attr))
                        return false;
        }

        return true;
}

static bool
save_option_colors(FILE *file)
{
        if (!io_fprintf(file, "%s", "\n\n## Colors\n"))
                return false;

        return foreach_line_rule(save_option_color, file);
}

enum status_code
save_options(const char *path)
{
        int fd = open(path, O_WRONLY | O_CREAT | O_EXCL, 0666);
        FILE *file = fd != -1 ? fdopen(fd, "w") : NULL;
        enum status_code code = SUCCESS;

        if (!file)
                return error("%s", strerror(errno));

        if (!io_fprintf(file, "%s", "# Saved by Tig\n")
            || !save_option_settings(file)
            || !save_option_keybindings(file)
            || !save_option_colors(file))
                code = error("Write returned an error");

        fclose(file);
        return code;
}

/*
 * Repository properties
 */

static void
set_remote_branch(const char *name, const char *value, size_t valuelen)
{
        if (!strcmp(name, ".remote")) {
                string_ncopy(repo.remote, value, valuelen);

        } else if (*repo.remote && !strcmp(name, ".merge")) {
                size_t from = strlen(repo.remote);

                if (!prefixcmp(value, "refs/heads/"))
                        value += STRING_SIZE("refs/heads/");

                if (!string_format_from(repo.remote, &from, "/%s", value))
                        repo.remote[0] = 0;
        }
}

static void
set_repo_config_option(char *name, char *value, enum status_code (*cmd)(int, const char **))
{
        const char *argv[SIZEOF_ARG] = { name, "=" };
        int argc = 1 + (cmd == option_set_command);
        enum status_code code;

        if (!argv_from_string(argv, &argc, value))
                code = error("Too many arguments");
        else
                code = cmd(argc, argv);

        if (code != SUCCESS)
                warn("Option 'tig.%s': %s", name, get_status_message(code));
}

static void
set_work_tree(const char *value)
{
        char cwd[SIZEOF_STR];

        if (!getcwd(cwd, sizeof(cwd)))
                die("Failed to get cwd path: %s", strerror(errno));
        if (chdir(cwd) < 0)
                die("Failed to chdir(%s): %s", cwd, strerror(errno));
        if (chdir(repo.git_dir) < 0)
                die("Failed to chdir(%s): %s", repo.git_dir, strerror(errno));
        if (!getcwd(repo.git_dir, sizeof(repo.git_dir)))
                die("Failed to get git path: %s", strerror(errno));
        if (chdir(value) < 0)
                die("Failed to chdir(%s): %s", value, strerror(errno));
        if (!getcwd(cwd, sizeof(cwd)))
                die("Failed to get cwd path: %s", strerror(errno));
        if (setenv("GIT_WORK_TREE", cwd, true))
                die("Failed to set GIT_WORK_TREE to '%s'", cwd);
        if (setenv("GIT_DIR", repo.git_dir, true))
                die("Failed to set GIT_DIR to '%s'", repo.git_dir);
        repo.is_inside_work_tree = true;
}

static struct line_info *
parse_git_color_option(struct line_info *info, char *value)
{
        const char *argv[SIZEOF_ARG];
        int argc = 0;
        bool first_color = true;
        int i;

        if (!argv_from_string(argv, &argc, value))
                return NULL;

        info->fg = COLOR_DEFAULT;
        info->bg = COLOR_DEFAULT;
        info->attr = 0;

        for (i = 0; i < argc; i++) {
                int attr = 0;

                if (set_attribute(&attr, argv[i])) {
                        info->attr |= attr;

                } else if (set_color(&attr, argv[i])) {
                        if (first_color)
                                info->fg = attr;
                        else
                                info->bg = attr;
                        first_color = false;
                }
        }
        return info;
}

static void
set_git_color_option(const char *name, char *value)
{
        struct line_info parsed = {0};
        struct line_info *color = NULL;
        size_t namelen = strlen(name);
        int i;

        if (!opt_git_colors)
                return;

        for (i = 0; opt_git_colors[i]; i++) {
                struct line_rule rule = {0};
                const char *prefix = NULL;
                struct line_info *info;
                const char *alias = opt_git_colors[i];
                const char *sep = strchr(alias, '=');

                if (!sep || namelen != sep - alias ||
                    string_enum_compare(name, alias, namelen))
                        continue;

                if (!color) {
                        color = parse_git_color_option(&parsed, value);
                        if (!color)
                                return;
                }

                if (parse_color_name(sep + 1, &rule, &prefix) == SUCCESS &&
                    (info = add_line_rule(prefix, &rule))) {
                        info->fg = parsed.fg;
                        info->bg = parsed.bg;
                        info->attr = parsed.attr;
                }
        }
}

static void
set_encoding(struct encoding **encoding_ref, const char *arg, bool priority)
{
        if (!strcasecmp(arg, "utf-8") || !strcasecmp(arg, "utf8"))
                return;
        if (parse_encoding(encoding_ref, arg, priority) == SUCCESS)
                encoding_arg[0] = 0;
}

static enum status_code
read_repo_config_option(char *name, size_t namelen, char *value, size_t valuelen, void *data)
{
        if (!strcmp(name, "i18n.commitencoding"))
                set_encoding(&default_encoding, value, false);

        else if (!strcmp(name, "gui.encoding"))
                set_encoding(&default_encoding, value, true);

        else if (!strcmp(name, "core.editor"))
                string_ncopy(opt_editor, value, valuelen);

        else if (!strcmp(name, "core.worktree"))
                set_work_tree(value);

        else if (!strcmp(name, "core.abbrev"))
                parse_int(&opt_id_width, value, 0, SIZEOF_REV - 1);

        else if (!prefixcmp(name, "tig.color."))
                set_repo_config_option(name + 10, value, option_color_command);

        else if (!prefixcmp(name, "tig.bind."))
                set_repo_config_option(name + 9, value, option_bind_command);

        else if (!prefixcmp(name, "tig."))
                set_repo_config_option(name + 4, value, option_set_command);

        else if (!prefixcmp(name, "color."))
                set_git_color_option(name + STRING_SIZE("color."), value);

        else if (*repo.head && !prefixcmp(name, "branch.") &&
                 !strncmp(name + 7, repo.head, strlen(repo.head)))
                set_remote_branch(name + 7 + strlen(repo.head), value, valuelen);

        else if (!strcmp(name, "diff.context")) {
                if (!find_option_info_by_value(&opt_diff_context)->seen)
                        opt_diff_context = -atoi(value);

        } else if (!strcmp(name, "format.pretty")) {
                if (!prefixcmp(value, "format:") && strstr(value, "%C("))
                        argv_append(&opt_log_options, "--pretty=medium");
        }

        return SUCCESS;
}

enum status_code
load_git_config(void)
{
        const char *config_list_argv[] = { "git", "config", "--list", NULL };

        return io_run_load(config_list_argv, "=", read_repo_config_option, NULL);
}

/* vim: set ts=8 sw=8 noexpandtab: */