C++ wcstring::clear方法代码示例

bool autosuggest_suggest_special(const wcstring &str, const wcstring &working_directory, wcstring &outSuggestion) {
    if (str.empty())
        return false;
        
    ASSERT_IS_BACKGROUND_THREAD();
    
    /* Parse the string */
    wcstring parsed_command;
    wcstring_list_t parsed_arguments;
    int parsed_last_arg_pos = -1;
    if (! autosuggest_parse_command(str, &parsed_command, &parsed_arguments, &parsed_last_arg_pos))
        return false;
    
    bool result = false;
    if (parsed_command == L"cd" && ! parsed_arguments.empty()) {        
        /* We can possibly handle this specially */
        wcstring dir = parsed_arguments.back();
        wcstring suggested_path;
        
        /* We always return true because we recognized the command. This prevents us from falling back to dumber algorithms; for example we won't suggest a non-directory for the cd command. */
        result = true;
        outSuggestion.clear();

        if (is_potential_cd_path(dir, working_directory, &suggested_path)) {
            /* Success */
            outSuggestion = str;
            outSuggestion.erase(parsed_last_arg_pos);
            outSuggestion.append(suggested_path);
        }
    } else {
        /* Either an error or some other command, so we don't handle it specially */
    }
    return result;
}

/* We have to return an escaped string here */
bool autosuggest_suggest_special(const wcstring &str, const wcstring &working_directory, wcstring &outSuggestion) {
    if (str.empty())
        return false;
        
    ASSERT_IS_BACKGROUND_THREAD();
    
    /* Parse the string */
    wcstring parsed_command;
    wcstring_list_t parsed_arguments;
    int parsed_last_arg_pos = -1;
    if (! autosuggest_parse_command(str, &parsed_command, &parsed_arguments, &parsed_last_arg_pos))
        return false;
    
    bool result = false;
    if (parsed_command == L"cd" && ! parsed_arguments.empty()) {        
        /* We can possibly handle this specially */
        const wcstring escaped_dir = parsed_arguments.back();
        wcstring suggested_path;
        
        /* We always return true because we recognized the command. This prevents us from falling back to dumber algorithms; for example we won't suggest a non-directory for the cd command. */
        result = true;
        outSuggestion.clear();
        
        /* Unescape the parameter */
        wcstring unescaped_dir = escaped_dir;
        bool unescaped = unescape_string(unescaped_dir, UNESCAPE_INCOMPLETE);
        
        /* Determine the quote type we got from the input directory. */
        wchar_t quote = L'\0';
        parse_util_get_parameter_info(escaped_dir, 0, &quote, NULL, NULL);
        
        /* Big hack to avoid expanding a tilde inside quotes */
        path_flags_t path_flags = (quote == L'\0') ? PATH_EXPAND_TILDE : 0;
        if (unescaped && is_potential_cd_path(unescaped_dir, working_directory, path_flags, &suggested_path)) {
                    
            /* Note: this looks really wrong for strings that have an "unescapable" character in them, e.g. a \t, because parse_util_escape_string_with_quote will insert that character */
            wcstring escaped_suggested_path = parse_util_escape_string_with_quote(suggested_path, quote);

            /* Return it */
            outSuggestion = str;
            outSuggestion.erase(parsed_last_arg_pos);
            if (quote != L'\0') outSuggestion.push_back(quote);
            outSuggestion.append(escaped_suggested_path);
            if (quote != L'\0') outSuggestion.push_back(quote);
        }
    } else {
        /* Either an error or some other command, so we don't handle it specially */
    }
    return result;
}

static void path_create(wcstring &path, const wcstring &xdg_var, const wcstring &which_dir,
                        const wcstring &custom_error_msg) {
    bool path_done = false;
    bool using_xdg = false;
    int saved_errno = 0;

    // The vars we fetch must be exported. Allowing them to be universal doesn't make sense and
    // allowing that creates a lock inversion that deadlocks the shell since we're called before
    // uvars are available.
    const env_var_t xdg_dir = env_get_string(xdg_var, ENV_GLOBAL | ENV_EXPORT);
    if (!xdg_dir.missing_or_empty()) {
        using_xdg = true;
        path = xdg_dir + L"/fish";
        if (create_directory(path) != -1) {
            path_done = true;
        } else {
            saved_errno = errno;
        }
    } else {
        const env_var_t home = env_get_string(L"HOME", ENV_GLOBAL | ENV_EXPORT);
        if (!home.missing_or_empty()) {
            path = home + (which_dir == L"config" ? L"/.config/fish" : L"/.local/share/fish");
            if (create_directory(path) != -1) {
                path_done = true;
            } else {
                saved_errno = errno;
            }
        }
    }

    if (!path_done) {
        maybe_issue_path_warning(which_dir, custom_error_msg, using_xdg, xdg_var, path,
                                 saved_errno);
        path.clear();
    }

    return;
}

void kill_destroy()
{
    cut_buffer.clear();
}