Description
The \textwidth command contains a value that represents the width of the current line on the page. The value is contextual in that if the current line is within a columnar environment, then \textwidth returns the value of the current column width. (If this does not work out for you, try \hsize instead.)
Example
The following example scales a long line of text to prevent it from breaking over multiple lines.
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\starttext \blackrule[height=1pt,width=\makeupwidth,] \startcolumns[rule=on,] \scale[maxwidth=\textwidth]{ This line uses the scaled command to fit within a column's width. } \column This line avoids the scaled command and will be split using line breaks. \stopcolumns \blackrule[height=1pt,width=\makeupwidth,] \stoptext
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