\"      Id: tbl.7,v 1.37 2021/09/18 12:34:27 schwarze Exp
\"
\" Copyright (c) 2010, 2011 Kristaps Dzonsons <[email protected]>
\" Copyright (c) 2014,2015,2017,2018,2019 Ingo Schwarze <[email protected]>
\"
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Dd September 18, 2021
Dt TBL 7
Os
Sh NAME
Nm tbl
Nd tbl language reference for mandoc
Sh DESCRIPTION
The
Nm tbl
language formats tables.
It is used within
Xr mdoc 7
and
Xr man 7
pages.
This manual describes the subset of the
Nm
language accepted by the
Xr mandoc 1
utility.
Pp
Each table is started with a
Xr roff 7
Ic \&TS
macro, consist of at most one line of
Sx Options ,
one or more
Sx Layout
lines, one or more
Sx Data
lines, and ends with a
Ic \&TE
macro.
All input must be 7-bit ASCII.
Ss Options
If the first input line of a table ends with a semicolon, it contains
case-insensitive options separated by spaces, tabs, or commas.
Otherwise, it is interpreted as the first
Sx Layout
line.
Pp
The following options are available.
Some of them require arguments enclosed in parentheses:
Bl -tag -width Ds
It Cm allbox
Draw a single-line box around each table cell.
It Cm box
Draw a single-line box around the table.
For GNU compatibility, this may also be invoked with
Cm frame .
It Cm center
Center the table instead of left-adjusting it.
For GNU compatibility, this may also be invoked with
Cm centre .
It Cm decimalpoint
Use the single-character argument as the decimal point with the
Cm n
layout key.
This is a GNU extension.
It Cm delim
Use the two characters of the argument as
Xr eqn 7
delimiters.
Currently unsupported.
It Cm doublebox
Draw a double-line box around the table.
For GNU compatibility, this may also be invoked with
Cm doubleframe .
It Cm expand
Increase the width of the table to the current line length.
Currently ignored.
It Cm linesize
Draw lines with the point size given by the unsigned integer argument.
Currently ignored.
It Cm nokeep
Allow page breaks within the table.
This is a GNU extension and currently ignored.
It Cm nospaces
Ignore leading and trailing spaces in data cells.
This is a GNU extension.
It Cm nowarn
Suppress warnings about tables exceeding the current line length.
This is a GNU extension and currently ignored.
It Cm tab
Use the single-character argument as a delimiter between data cells.
By default, the horizontal tabulator character is used.
El
Ss Layout
The table layout follows an
Sx Options
line or a
Xr roff 7
Ic \&TS
or
Ic \&T&
macro.
Each layout line specifies how one line of
Sx Data
is formatted.
The last layout line ends with a full stop.
It also applies to all remaining data lines.
Multiple layout lines can be joined by commas on a single physical
input line.
Pp
Each layout line consists of one or more layout cell specifications,
optionally separated by whitespace.
The following case-insensitive key characters start a new cell
specification:
Bl -tag -width 2n
It Cm c
Center the string in this cell.
It Cm r
Right-justify the string in this cell.
It Cm l
Left-justify the string in this cell.
It Cm n
Justify a number around its last decimal point.
If no decimal point is found in the number,
it is assumed to trail the number.
It Cm s
Horizontally span columns from the last
Pf non- Cm s
layout cell.
It is an error if a column span follows a
Cm _
or
Cm =
cell, or comes first on a layout line.
The combined cell as a whole consumes only one cell
of the corresponding data line.
It Cm a
Left-justify a string and pad with one space.
It Cm \(ha
Vertically span rows from the last
Pf non- Cm \(ha
layout cell.
It is an error to invoke a vertical span on the first layout line.
Unlike a horizontal span, a vertical span consumes a data cell
and discards the content.
It Cm _
Draw a single horizontal line in this cell.
This consumes a data cell and discards the content.
It may also be invoked with
Cm \- .
It Cm =
Draw a double horizontal line in this cell.
This consumes a data cell and discards the content.
El
Pp
Each cell key may be followed by zero or more of the following
case-insensitive modifiers:
Bl -tag -width 2n
It Cm b
Use a bold font for the contents of this cell.
It Cm d
Move content down to the last row of this vertical span.
Currently ignored.
It Cm e
Make this column wider to match the maximum width
of any other column also having the
Cm e
modifier.
It Cm f
The next one or two characters select the font to use for this cell.
One-character font names must be followed by a blank or period.
See the
Xr roff 7
manual for supported font names.
It Cm i
Use an italic font for the contents of this cell.
It Cm m
Specify a cell start macro.
This is a GNU extension and currently unsupported.
It Cm p
Set the point size to the following unsigned argument,
or change it by the following signed argument.
Currently ignored.
It Cm v
Set the vertical line spacing to the following unsigned argument,
or change it by the following signed argument.
Currently ignored.
It Cm t
Do not vertically center content in this vertical span,
leave it in the top row.
Currently ignored.
It Cm u
Move cell content up by half a table row.
Currently ignored.
It Cm w
Specify a minimum column width.
It Cm x
After determining the width of all other columns, distribute the
rest of the line length among all columns having the
Cm x
modifier.
It Cm z
Do not use this cell for determining the width of this column.
It Cm \&|
Draw a single vertical line to the right of this cell.
It Cm ||
Draw a double vertical line to the right of this cell.
El
Pp
If a modifier consists of decimal digits,
it specifies a minimum spacing in units of
Cm n
between this column and the next column to the right.
The default is 3.
If there is a vertical line, it is drawn inside the spacing.
Ss Data
The data section follows the last
Sx Layout
line.
Each data line consists of one or more data cells, delimited by
Cm tab
characters.
Pp
If a data cell contains only the two bytes
Ql \e\(ha ,
the cell above spans to this row, as if the layout specification
of this cell were
Cm \(ha .
Pp
If a data cell contains only the single character
Ql _
or
Ql = ,
a single or double horizontal line is drawn across the cell,
joining its neighbours.
If a data cell contains only the two character sequence
Ql \e_
or
Ql \e= ,
a single or double horizontal line is drawn inside the cell,
not joining its neighbours.
If a data line contains nothing but the single character
Ql _
or
Ql = ,
a horizontal line across the whole table is inserted
without consuming a layout row.
Pp
In place of any data cell, a text block can be used.
It starts with
Ic \&T{
at the end of a physical input line.
Input line breaks inside the text block
neither end the text block nor its data cell.
It only ends if
Ic \&T}
occurs at the beginning of a physical input line and is followed
by an end-of-cell indicator.
If the
Ic \&T}
is followed by the end of the physical input line, the text block,
the data cell, and the data line ends at this point.
If the
Ic \&T}
is followed by the
Cm tab
character, only the text block and the data cell end,
but the data line continues with the data cell following the
Cm tab
character.
If
Ic \&T}
is followed by any other character, it does not end the text block,
which instead continues to the following physical input line.
Sh EXAMPLES
String justification and font selection:
Bd -literal -offset indent
\&.TS
rb c  lb
r  ci l.
r       center  l
ri      ce      le
right   c       left
\&.TE
Ed
Bd -filled -offset indent
TS
rb c  lb
r  ci l.
r       center  l
ri      ce      le
right   c       left
TE
Ed
Pp
Some ports in
Ox 6.1
to show number alignment and line drawing:
Bd -literal -offset indent
\&.TS
box tab(:);
r| l
r  n.
software:version
_
AFL:2.39b
Mutt:1.8.0
Ruby:1.8.7.374
TeX Live:2015
\&.TE
Ed
Bd -filled -offset indent
TS
box tab(:);
r| l
r  n.
software:version
_
AFL:2.39b
Mutt:1.8.0
Ruby:1.8.7.374
TeX Live:2015
TE
Ed
sp 2v
Spans and skipping width calculations:
Bd -literal -offset indent
\&.TS
box tab(:);
lz  s | rt
lt| cb| \(ha
\(ha | rz  s.
left:r
l:center:
:right
\&.TE
Ed
Bd -filled -offset indent
TS
box tab(:);
lz  s | rt
lt| cb| ^
^ | rz  s.
left:r
l:center:
:right
TE
Ed
sp 2v
Text blocks, specifying spacings and specifying and equalizing
column widths, putting lines into individual cells, and overriding
Cm allbox :
Bd -literal -offset indent
\&.TS
allbox tab(:);
le le||7 lw10.
The fourth line:_:line 1
of this column:=:line 2
determines:\_:line 3
the column width.:T{
This text is too wide to fit into a column of width 17.
T}:line 4
T{
No break here.
T}::line 5
\&.TE
Ed
Bd -filled -offset indent
TS
allbox tab(:);
le le||7 lw10.
The fourth line:_:line 1
of this column:=:line 2
determines:\_:line 3
the column width.:T{
This text is too wide to fit into a column of width 17.
T}:line 4
T{
No break here.
T}::line 5
TE
Ed
sp 2v
These examples were constructed to demonstrate many
Nm
features in a compact way.
In real manual pages, keep tables as simple as possible.
They usually look better, are less fragile, and are more portable.
Sh COMPATIBILITY
The
Xr mandoc 1
implementation of
Nm
doesn't support
Xr mdoc 7
and
Xr man 7
macros and
Xr eqn 7
equations inside tables.
Sh SEE ALSO
Xr mandoc 1 ,
Xr man 7 ,
Xr mandoc_char 7 ,
Xr mdoc 7 ,
Xr roff 7
Rs
%A M. E. Lesk
%T Tbl \(em A Program to Format Tables
%D June 11, 1976
Re
Sh HISTORY
The tbl utility, a preprocessor for troff, was originally written by M.
E. Lesk at Bell Labs in 1975.
The GNU reimplementation of tbl, part of the groff package, was released
in 1990 by James Clark.
A standalone tbl implementation was written by Kristaps Dzonsons in
2010.
This formed the basis of the implementation that first appeared in
Ox 4.9
as a part of the
Xr mandoc 1
utility.
Sh AUTHORS
This
Nm
reference was written by
An Kristaps Dzonsons Aq Mt [email protected]
and
An Ingo Schwarze Aq Mt [email protected] .
Sh BUGS
In
Fl T
Cm utf8
output mode, heavy lines are drawn instead of double lines.
This cannot be improved because the Unicode standard only provides
an incomplete set of box drawing characters with double lines,
whereas it provides a full set of box drawing characters
with heavy lines.
It is unlikely this can be improved in the future because the box
drawing characters are already marked in Unicode as characters
intended only for backward compatibility with legacy systems,
and their use is not encouraged.
So it seems unlikely that the missing ones might get added in the future.

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