The primary way of using Schema Voyager is through schema-voyager.cli/standalone. You tell this function where your sources of schema data are. It pulls in those sources and creates a standalone web page where you can explore your schema.

In the docs below, replace VERSION with the latest release coordinates provided by Clojars:

As an alias

In most cases you'll be working on a team and several developers will need to be able to re-generate the standalone web page. The easiest way to share the command to do this is to create a deps.edn alias that invokes schema-voyager.cli.

;; deps.edn
{,,,
 :aliases {:schema {:replace-deps {com.github.mainej/schema-voyager {:mvn/version "VERSION"}}
                    :ns-default   schema-voyager.cli
                    ;; This example demonstrates using a few file sources, but any type of source is available.
                    :exec-args    {:sources [{:file/name "resources/main-schema.edn"}
                                             {:file/name "resources/supplemental-schema.edn"}]}}}}

Execute the alias like so:

clojure -X:schema standalone

This will generate a file called schema-voyager.html, a standalone web page you can use to explore your schema.

To a different file

The HTML file is placed in the current directory, by default. You can modify the location by passing :output-path to schema-voyager.cli/standalone:

;; deps.edn
{,,,
 :aliases {:schema {:replace-deps {com.github.mainej/schema-voyager {:mvn/version "VERSION"}}
                    :ns-default   schema-voyager.cli
                    :exec-args    {:sources     [{:file/name "resources/main-schema.edn"}
                                                 {:file/name "resources/supplemental-schema.edn"}]
                                   ;; save to target/schema.html instead
                                   :output-path "target/schema.html"}}}}

As an alias, with Datomic

If you need to include a Datomic source, as many people do, you must depend on com.datomic/client-cloud and/or com.datomic/dev-local.

;; deps.edn
{,,,
 :aliases {:schema {:replace-deps {com.github.mainej/schema-voyager {:mvn/version "VERSION"}
                                   com.datomic/client-cloud         {:mvn/version "0.8.113"}
                                   com.datomic/dev-local            {:mvn/version "0.9.235"}}
                    :ns-default   schema-voyager.cli
                    :exec-args    {:sources [{:datomic/db-name "my-db-name",
                                              :datomic/client-config {:server-type :dev-local, :system "my-system"}}
                                             {:file/name "resources/my-supplemental-schema.edn"}]}}}}

Different sources

If you want to quickly test a different set of sources, you can provide them at the command line:

clojure -X:schema standalone \
  :sources '[{:file/name "resources/main-schema.edn"}
             {:file/name "resources/supplemental-schema.edn"}]'

As a script

You can create a script which calls schema-voyager.cli/standalone directly.

(ns my.ns
  (:require [schema-voyager.cli :as cli]))

(def schema
  [{:db/ident :track/name
    :db/valueType :db.type/string
    :db/cardinality :db.cardinality/one}])

(defn -main [_]
  (cli/standalone {:sources [{:static/data schema}]}))

This example demonstrates using a static source, but any type of source is available.

Where to go from here

It's time! Explore your schema.