Engines of other languages
This object controls how to execute the code from languages other than R
(when the chunk option engine is not 'R'). Each component in
this object is a function that takes a list of current chunk options
(including the source code) and returns a character string to be written into
the output.
knit_engines
An object of class list of length 6.
The engine function has one argument options: the source code of the
current chunk is in options$code. Usually we can call external
programs to run the code via system2. Other chunk options are
also contained in this argument, e.g. options$echo and
options$eval, etc.
In most cases, options$engine can be directly used in command line to
execute the code, e.g. python or ruby, but sometimes we may
want to specify the path of the engine program, in which case we can pass it
through the engine.path option. For example, engine='ruby',
engine.path='/usr/bin/ruby1.9.1'. Additional command line arguments can be
passed through options$engine.opts, e.g. engine='ruby',
engine.opts='-v'.
See str(knitr::knit_engines$get()) for a list of built-in language
engines.
The Leiningen engine lein requires lein-exec plugin; see
https://github.com/yihui/knitr/issues/1176 for details.
Usage: https://yihui.org/knitr/objects/; examples: https://yihui.org/knitr/demo/engines/
knit_engines$get("python")
knit_engines$get("awk")
names(knit_engines$get())Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.