raco: How to install a package or update it if it already exists?

raco pkg install <package-name> installs a package if it does not yet exist, and fails if the package already exists. raco pkg update <package-name> updates a package, and fails if the package does not yet exist.

raco pkg install <package-name>

raco pkg update <package-name>

Is there a raco command that combines both commands? In other words, is there a command that can install a package if it does not exist, and also update the package if it already exists?

Rationale: This kind of command would be useful in shell scripting. For example, in Debian/Ubuntu, the apt-get install command has the exact required behaviour, and for python, pip install --upgrade has that too. Is there an equivalent for raco?

apt-get install

pip install --upgrade

Racket version: 6.11

1 Answer
1

You can use raco pkg show <package> to detect if a package is installed, for example with something like:

raco pkg show <package>

mypkg='memoize'
if [ " [none]" = "$(raco pkg show '$mypkg' | tail -1)" ]; then
raco pkg install "$mypkg"
else
raco pkg update "$mypkg"
fi


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