Re: [PATCH v2] tzfile.5: Fix indentation

[G. Branden Robinson]

At 2024-03-17T20:31:55+0100, Alejandro Colomar wrote:
> Hmmm, I was about to say inset, but double-checked groff_man(7) to be
> sure of the exact term, and then I got confused even more:
> 
> $ man groff_man | grep '   \.\(IP\|RS\) \['
>      .RS [inset‐amount]
>      .IP [tag [indentation]]
> 
> Since RS uses the same amount that IP used before it, it seems they
> could be the same thing.  But then RS uses inset and IP uses
> indentation.  How do pears be added to apples?  :)

Both are (horizontal) measurements, so they are commensurable and
additive.  Where they differ is in application.

An inset applies to all output lines, period.

An indentation applies only to a thing called a "paragraph".  The
various paragraphs types are distinguished primarily by where they apply
indentation to their lines.  As I put it in the groff's ms(7)
documentation, which presents a similar matter...

groff_ms(7):

   Paragraphs
     Paragraphing macros break, or terminate, any pending output line so
     that a new paragraph can begin.  Several paragraph types are
     available, differing in how indentation applies to them: ... to the
     first output line of the paragraph, all output lines, or all but
     the first.  These calls insert vertical space in the amount stored
     in the PD register, except at page or column breaks, ...

Regards,
Branden

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