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added class->source with module system to readme #61

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added class->source with module system to readme #61

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16 changes: 16 additions & 0 deletions README.md
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Expand Up @@ -32,6 +32,22 @@ As a quick example of you can do with it:
;; Usage: (-> Thread class->source println)
```

For Java >= 9 with the module system it would be:

```clj
(require '[clojure.java.io :as io])
(require '[clojure.string :as string])

(defn class->source-with-module [class-object]
{:pre [(class? class-object)]}
(let [module (.getName (.getModule Thread))
java-file (-> Thread pr-str munge (string/replace "." "/") (str ".java"))]
(->
(str module "/" java-file)
(io/resource)
slurp)))
;; Usage: (-> Thread class->source println)
```
All what the plugin does is placing a source (and/or javadoc) `.jar` in the classpath, so that `(io/resource)` will return it (else it would return `nil`).

A great real-world lib that would be enhanced by this program is Orchard's [source-info](https://github.com/clojure-emacs/orchard/blob/f8a85feb613501be0896c3683c8ff7b0bd404061/src/orchard/java/parser.clj#L290).
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