On 14 Jan 2016, at 08:41, Marco Patzer <lists@homerow.info> wrote:

On Wed, 13 Jan 2016 23:18:03 +0100
Pablo Rodriguez <oinos@gmx.es> wrote:

which is the difference between \doiftext and \doifempty?

First of all, the logic is reversed, \doiftext prints the second
argument if the first one contains text, \doifempty does print the
second argument if the first one *does not* contain anything. You can
get around this by using the \…else versions.

Then, the major difference is that \doifempty checks if the argument
is empty and nothing else. \doiftext checks if it contains a box of
non-zero width.

\starttext
 text: \doiftextelse{foo}{is text}{no text}\par
 text: \doifemptyelse{foo}{is empty}{not empty}\par
 empty: \doiftextelse{}{is text}{no text}\par
 empty: \doifemptyelse{}{is empty}{not empty}\par
 space: \doiftextelse{\space}{is text}{no text}\par
 space: \doifemptyelse{\space}{is empty}{not empty}\par
 zero width: \doiftextelse{\framed[width=0cm]{frame}}{is text}{no text}\par
 zero width: \doifemptyelse{\framed[width=0cm]{frame}}{is empty}{not empty}\par
 image: \doiftextelse{\externalfigure[cow]}{is text}{no text}\par
 image: \doifemptyelse{\externalfigure[cow]}{is empty}{not empty}\par
\stoptext

Marco
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