cannot define an engine.path for dot engine

[billy34]

It seems that defining an engine path for dot engine does not work as expected. In fact the value is not used at all.

Looking into the code I think I found the origin of the problem located in the eng_dot function of the engines.r file and especially in the following lines:

cmd = sprintf(command_string, shQuote(options$engine %n% options$engine.path),
shQuote(f), ext <- options$fig.ext %n% dev2ext(options$dev),
shQuote(paste0(fig <- fig_path(), '.', ext)))

As options$engine is always defined, options$engine.path has no chance to be used!

One way to correct code is simply swapping options$engine and options$engine.path or use the function get_engine_path(options$engine.path,options$engine) you use for other engines.

[yihui]

Should be fixed now. Thanks for the report!

[github-actions]

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