CODEWITHSUNDEEP
jsonocaml
maltbar
maltbar

Reputation: 99

Launch interactive OCaml session with library (Yojson) available

I've installed the Yojson library for OCaml via GODI: http://martin.jambon.free.fr/yojson.html

I want to start an interactive ocaml session (i.e. via the ocaml command) and execute functions from the Yojson library e.g.

Yojson.Safe.from_string;;

How do I do this? The above command gives "Error: Unbound module Yojson". I've worked out how to compile via ocamlc with Yojson available, but I want to launch an interactive session instead.

I know this seems like a horrible beginners question but Yojson comes with no samples and minimal instructions so I'm really stumped. I've tried various combinations of "#load" and compiler switches and I'm stuck.

Upvotes: 3

Views: 730

Answers (1)

hcarty
hcarty

Reputation: 1671

The tool you are after is called findlib. It is included in the base GODI installation. The tools that come with findlib allow you to easily compile against most OCaml libraries and use those libraries from a toplevel session (ocaml). The findlib documentation is fairly comprehensive, but here is a quick summary to get started.

To start using findlib from within a toplevel session:

#use "topfind";;

This will display a brief usage message. Then you can type:

#list;;

This will show you a list of all of the available packages. Yojson will likely be among them. Finally:

#require "yojson";;

where yojson is replaced by the appropriate entry shown by #list;;. Yojson's modules should be available for you to use at this point.

Upvotes: 6

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