Update of bug #64018 (project groff):
Status: Need Info => Confirmed
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Follow-up Comment #19:
Alex's case of cringe at my `is_family_valid` function has been raised on the
_groff_ development list.
https://lists.gnu.org/archive/html/groff/2023-08/msg00008.html
https://lists.gnu.org/archive/html/groff/2023-08/msg00009.html
It is off-topic for this ticket; let's please discuss `lengthof` elsewhere.
Let me update my intentions from comment #5 as follows.
This ticket contemplates two new registers for man(7), and restricted
meaning for the `IN` register, first exposed/documented by Documenter's
Workbench (DWB) 1.0 in 1984.
* BP: base paragraph indentation configures how far the left margin of
a normal paragraph is inset from the page offset (which is 0 on
terminals) to which relative insets are added. Default: 5n.
Currently, `IN` is used for this purpose as well as `RS`.
* IN: the "standard indentation" would now configure only the default
indentation increment used for relative inset. Default: 7n/7.2n (no
change).
* TS: the "tag spacing" configures the size the of the gap that is
required after a paragraph tag. This amount is added to the width of
the diversion created by the `IP` and `TP` macros to format the tag.
If that amount is greater than the standard indentation, a break is
emitted and the remainder of the paragraph is formatted starting on a
new output line, indented by the `IN` increment. Default: 2n.
Currently, a value of 1n is used for this purpose. (In groff 1.23.0,
it's stored in the internal `an-tag-separation` register, but not
readily user-configurable.)
For consistent rendering of mdoc(7) pages, these parameters (if set)
would be honored by that macro package too, as `SN` and `IN` already
are, where comparable macro semantics permit.
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