Emacs 为每个连续的行缩进一个额外的级别

Question

你如何告诉 emacs 将当前续行缩进（例如，在点或间接运算符之后）比前一个更深一级？关于哪个更漂亮的争论在这里无关紧要，因为这是我们在工作中使用的风格，所以我真的别无选择。

我猜这是一个偏移量（可能是statement-cont？），但我不确定如何动态地做到这一点......

相关类型：How to control indentation after an open parenthesis in Emacs

有

#include <stdio.h>

struct thing {
    int the_first_piece_of_data;
};

struct stuff {
    struct thing the_first_thing_in_this_stuff;
    struct thing *pointer_to_the_first_thing_in_this_stuff;
};

int main(int argc, char *argv[])
{
    struct stuff some_stuff_to_work_with;
    struct stuff *pointer_to_stuff = &some_stuff_to_work_with;
    some_stuff_to_work_with.
        pointer_to_the_first_thing_in_this_stuff =
        &(some_stuff_to_work_with.
          the_first_thing_in_this_stuff);

    some_stuff_to_work_with.
        the_first_thing_in_this_stuff.
        the_first_piece_of_data = 42;

    printf("The piece of data is => %d\n",
           some_stuff_to_work_with.
           the_first_thing_in_this_stuff.
           the_first_piece_of_data);

    pointer_to_stuff->
        pointer_to_the_first_thing_in_this_stuff->
        the_first_piece_of_data++;

    printf("The piece of data is => %d\n",
           pointer_to_stuff->
           pointer_to_the_first_thing_in_this_stuff->
           the_first_piece_of_data);

    return 0;
}

想要

#include <stdio.h>

struct thing {
    int the_first_piece_of_data;
};

struct stuff {
    struct thing the_first_thing_in_this_stuff;
    struct thing *pointer_to_the_first_thing_in_this_stuff;
};

int main(int argc, char *argv[])
{
    struct stuff some_stuff_to_work_with;
    struct stuff *pointer_to_stuff = &some_stuff_to_work_with;
    some_stuff_to_work_with.
        pointer_to_the_first_thing_in_this_stuff =
            &(some_stuff_to_work_with. /*exra indent*/
              the_first_thing_in_this_stuff);

    some_stuff_to_work_with.
        the_first_thing_in_this_stuff.
            the_first_piece_of_data = 42; /*exra indent*/

    printf("The piece of data is => %d\n",
           some_stuff_to_work_with.
               the_first_thing_in_this_stuff. /*exra indent*/
                   the_first_piece_of_data); /*exra indent*/

    pointer_to_stuff->
        pointer_to_the_first_thing_in_this_stuff->
            the_first_piece_of_data++; /*exra indent*/

    printf("The piece of data is => %d\n",
           pointer_to_stuff->
               pointer_to_the_first_thing_in_this_stuff-> /*exra indent*/
                   the_first_piece_of_data); /*exra indent*/

    return 0;
}

Answer 1

这对于内置缩进选项是不可能的。

你可以通过在你想要/* extra indent */的行和它们上面的行上使用C-c C-s（又名c-show-syntactic-information）来验证这一点，你会看到语法信息那些行总是一样的。换句话说，就缩进引擎所知，这些行在语法上是相同的。

查看interactive customization 的文档。

也许可以通过自定义c-special-indent-hook来做你想做的事情。