Re: [Groff] Unexpected tbl behavior

[Ingo Schwarze]

Hi Blake,

here are the rules:

 - column widths are measured unless specified
   [tbl(1), second paragraph below "Table data"]
 - measurements result in at least 1n [undocumented]
 - column separations default to 3n unless specified
   [tbl(1), last but one paragraph]
 - "\_" extend from the beginning of the column to one beyond the end
 - "_" extend half into the separation on either side, rounding up
   [both in tbl(1), third paragraph from the end in "Table data",
    but somewhat fuzzily, neither explaining the "one beyond the end"
    nor the "half rounding up" exactly]

On Thu, Sep 4, 2014 at 10:01 PM, Blake McBride <address@hidden> wrote:

> .TS
> tab(;);
> L L L L L .
> AAA;;BBB;;CCC
> _;;_;;_
> aaa;;bbb;;ccc
> .TE

number of columns:      5
widths (measured):      3 1 3 1 3
separations (default):   3 3 3 3
rulers into sep's:      3/2 = 2
consequently:
columns with data:      1>3     11>13       21>23
separations:              4>6 8>10 14>16 18>20
rulers:                 1>3+2 11-2>13+2   21-2>23+1

> The first column is, unexpectedly, wide, i.e. longer than needed.

It isn't.  There is a second, empty column and two separations.

> The second column is not left justified.
> It has padding on the right and left.

It is left justified and it hasn't padding on either side.
The "_" rulers extend half into the separations on either side.

> The third column had no padding on the right, but does on the left.

No padding here either.


Blake McBride wrote on Thu, Sep 04, 2014 at 10:52:27PM -0500:

> .TS
> tab(;);
> L L L .
> AAA;BBB;CCC
> \_;\_;\_
> aaa;bbb;ccc
> .TE

number of columns:      3
widths (measured):      3 3 3
separations (default):   3 3
rulers into sep's:      0 left, 1 right
consequently:
columns with data:      1>3   7>9   13>15
separations:               4>6   10>12
rulers:                 1>4+1 7>9+1 13>15+1

Yours,
  Ingo