Callbacks

[lemzwerg]

\input nodetree

\NodetreeSetOption[channel]{log}
\NodetreeSetOption[verbosity]{0}
\NodetreeRegisterCallback{ligaturing,kerning}
VAffi

\NodetreeUnregisterCallback{ligaturing,kerning}
\bye

Before:

After:

\documentclass{article}

\usepackage[OT1]{fontenc}
\usepackage[channel=log,verbosity=0]{nodetree}
\NodetreeUnregisterCallback{postline}

\begin{document}
\NodetreeRegisterCallback{ligaturing,kerning}
VAffi

\NodetreeUnregisterCallback{ligaturing,kerning}
\end{document}

Before:

After:

[Josef-Friedrich]

Very nice!