X-Git-Url: https://git.distorted.org.uk/~mdw/mdwtools/blobdiff_plain/b1143cde89fdff7b39c6a65774ee44349f4241ad..e8e9e5d812460c19d276d9449a1792e2b384eb20:/mdwtab.dtx

diff --git a/mdwtab.dtx b/mdwtab.dtx
index 3e52084..3c4b419 100644
--- a/mdwtab.dtx
+++ b/mdwtab.dtx
@@ -44,7 +44,7 @@
 %<+color>                [2003/08/24 1.10 Fix for people who can't spell]
 % \end{meta-comment}
 %
-% \CheckSum{3386}
+% \CheckSum{3404}
 %% \CharacterTable
 %%  {Upper-case    \A\B\C\D\E\F\G\H\I\J\K\L\M\N\O\P\Q\R\S\T\U\V\W\X\Y\Z
 %%   Lower-case    \a\b\c\d\e\f\g\h\i\j\k\l\m\n\o\p\q\r\s\t\u\v\w\x\y\z
@@ -553,7 +553,7 @@
 % The |*| or optional \<rule-params> give rule-drawing parameters for the |h|
 % and |c| subcommands.  (Note that you can't pass a |*| or an optional
 % parameters argument to the |h| or |c| subcommands directly.)  See
-% section~\ref{sec:ruleparams}. 
+% section~\ref{sec:ruleparams}.
 %
 % The argument works a bit like a table preamble, really.  Each letter is a
 % command.  The following are supported:
@@ -651,7 +651,7 @@
 % then you get an extra thick rule at the bottom of the page.  This is a bit
 % of a problem, because if the rule isn't there in the footer and you get
 % a break between two rows \emph{without} a rule between them, then the page
-% looks very odd.  
+% looks very odd.
 %
 % If you want to do ruled longtables, I'd recommend that you proceed as
 % follows:
@@ -890,7 +890,7 @@
 % Note that if you do gobble the |\tab@mkpream|, it's your responsibility to
 % insert another one at the very end of your macro's expansion (so that
 % further preamble characters can be read).
-% 
+%
 % The replacement text is inserted directly.  It's normal to insert preamble
 % elements here.  There are several to choose from:
 %
@@ -1082,7 +1082,7 @@
 %   \[ "*" \]
 %   \[ "[" <colour-model> "]" \]
 %   "{" <colour> "}"
-%   \[ "[" <left-overhang> "]" 
+%   \[ "[" <left-overhang> "]"
 %      \[ "[" <right-overhang> "]" \] \]
 % \]]
 % \end{grammar}
@@ -1946,14 +1946,14 @@
 %
 %
 % \subsection{Parser states}
-% 
+%
 % Now we start on the parser.  It's really simple, deep down.  We progress
 % from state to state, extracting tokens from the preamble and building
 % command names from them.  Each command calls one of the element-building
 % routines, which works out which state it should be in.  We go through each
 % of the states in between (see later) doing default things for the ones we
 % missed out.
-% 
+%
 % Anyway, here's some symbolic names for the states.  It makes my life
 % easier.
 %
@@ -3787,7 +3787,7 @@
 %
 % \begin{macro}{\tab@dohline}
 %
-% This is where hlines actually get drawn.  
+% This is where hlines actually get drawn.
 % Drawing lines is more awkward than it used to be, particularly in unboxed
 % tables.  It used to be a case simply of saying |\noalign{\hrule}|.
 % However, since unboxed tables are actually much wider than they look, this
@@ -4885,7 +4885,7 @@
   \if@fleqn%
     \eqaopenskip\mathindent%
     \splitleft\mathindent\relax%
-    \splitright\mathindent\@minus\mathindent\relax%  
+    \splitright\mathindent\@minus\mathindent\relax%
   \else%
     \eqaopenskip\@centering%
     \splitleft2.5em\@minus2.5em%
@@ -5147,7 +5147,7 @@
 % \end{environment}
 % \end{environment}
 %
-% Now we can define the column types. 
+% Now we can define the column types.
 %
 %    \begin{macrocode}
 \colpush{eqnarray}
@@ -5581,9 +5581,13 @@
 % we need to remove them by hand at the extremities of the environment.
 %
 %    \begin{macrocode}
-\def\subsplit{%
+\def\subsplit{\@ifnextchar[\subsplit@i{\subsplit@i[c]}}
+\def\subsplit@i[#1]{%
+  \let\@tempa\vcenter%
+  \if#1t\let\@tempa\vtop\fi%
+  \if#1b\let\@tempa\vbox\fi%
   \let\\\seq@cr%
-  \vcenter\bgroup%
+  \@tempa\bgroup%
   \seq@dosplit{\hfil\qquad$##$\qquad\hfil}{\hfilneg\hskip-2em}%
 }
 %    \end{macrocode}