Provide a setting about how deep to indent code

[morbius1st]

Is your feature request related to a problem? Please describe.
Not exactly a problem - just a preference. When the code is formatted, code lines are on a different line but are indented to align with the beginning of the function that the following lines of code are associated with. I feel that subsequent code lines should be indented one extra tab depth from the prior line (even better would be setting that sent the number of tabs indented in from the prior code line. I personally find having code lines extra deeply indented hard to read - even though i understand the reason / basis.

Describe the solution you'd like
settings to control how subsequent code lines are indented (to align or not to align) and how many tabs indented and whether to not change the relative depth from whatever the user has indented.

Describe alternatives you've considered
No alternatives.

Additional context
This is similar to how visual studio + R# works.

[hualin-wu-2000]

Could you paste some pics to describe the issue and the expected behaviors?

[morbius1st]

sure. attached. image #1 shows basically what I want - although the tabs keep being drawn as 2 spaces and not the 4 I want - I don't know why. Anyway, in image 2, this is after a format selection, everything gets extra indented. I just want I tab depth per indent level (like image 1). Or, at least, a setting that gives me the option.

[hawstom]

Please take into consideration my strong support for this request and my contribution of the insight that in the age of AI (2025 onward), idiosyncratic conventions or exceptions about indentation are very hard for AI agents to handle. Whatever you do should be the easiest to describe rigorously.

Rule for indentation

All nested new lines must be indented one additional tab for every additional nesting level. This is demonstrated approximately correctly at example 1 in the image shared above by morbius1st. This rule does not specify what to do with closing parens.

(defun indentme
  (lots of arguments / local ones are great but there were very many
    of us)
  (setq
    ones
    1
    great
    (+ ones lots)
  )
  (cond
    (ones
      (princ "Yes!")
    )
  )
  (if
    arguments
    (while
      (not there)
      (princ very)
    )
  )
)

Difficult exceptions

The following are conventions/exceptions that just make working with AI agents really hard:

1. NO: Align nesting on new lines with its position on preceding lines irrespective of the main rule.

(haws-bad-example (strcat "a"
                          "b"
                          "c"
                          "d"
                          "e"
                  )
)

2. NO: Indent cond expressions with a single space to align with their first line.

(cond
 ((not many)
  (princ "Few: Bad example of cond indentation exception.")
 )
)

3. NO: Indent setq alternately for readability.

(setq
  a
   1
  b
   "Bad example of setq indentation exception. Just follow the main rule. No exceptions."
)

Possibly provide a "Uniform indentation of new lines" option.