I found that polyml
is the implementation of ML that can be easily installed on Ubuntu (named polyml in repository and can be executed with poly
). I am following the A Gentle Introduction to ML by Andrew Cumming. After few minutes of experiment with polyml
interpreter I found that it does not supports readline (pressing arrow up key produces a ^[[A).
This doesn't seems to be normal for an interpreter. This should only happen if I have no readline installed, but my Python interpreter doesn't behaves so.
The simplest way to add readline support to a terminal program that does not natively support it, is to call the program using rlwrap
. You can install the package of the same name through several package managers. Pressing ↑ in the examples below:
$ poly
Poly/ML 5.7.1 Release
- ^[[A
You can run it like this:
$ rlwrap poly
Poly/ML 5.7.1 Release
- stuff I typed from last session;
Or you can add an alias in your ~/.bashrc
or similar:
alias poly='rlwrap poly'
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