Hi,

Once the mode is activated, introducing newlines at key places should 
make the formula readable. You can also use sexp-navigation commands to 
quickly navigate the parentheses and find those key points.

I'm not aware of any language mode which offers to automatically 
introduce line breaks in a long one-liner.

Best wishes,

Thibaut

On 26/04/2022 11:40, Hongyi Zhao wrote:
> On Tue, Apr 26, 2022 at 4:53 PM Robert Pluim <rpluim@gmail.com> wrote:
>>>>>>> On Tue, 26 Apr 2022 16:42:26 +0800, Hongyi Zhao <hongyi.zhao@gmail.com> said:
>>      Hongyi> I've the following code snippets of the wolfram language:
>>      Hongyi> ```
>>      Hongyi> Hold[ReplaceRepeated[List[A, B, IA, A, B, IA, A, B, IA, A, B, IA, A,
>>      Hongyi> B, IA], RuleDelayed[Condition[List[Pattern[x, BlankNullSequence[]],
>>      Hongyi> Pattern[y, Blank[]], Pattern[z, Blank[]], Pattern[t,
>>      Hongyi> BlankNullSequence[]]], Simplify[Equal[Dot[y, z], IdentityMatrix[3]]]],
>>      Hongyi> List[x, t]]]]
>>      Hongyi> ```
>>
>>      Hongyi> I want to format it in Emacs to improve readability. Any hints for
>>      Hongyi> achieving this purpose?
>>
>> Install wolfram-mode?
> BTW, here [1] is a more recent and alternative version of
> wolfram-mode, but it does not have the functions required for the
> issues discussed here.
>
> [1] https://github.com/xahlee/xah-wolfram-mode
>
> HZ
>