Add library output

This allows tailoring the output specifically to the needs of libraries,
such as automatically placing the pom.xml.

README.adoc

@@ -41,7 +41,7 @@ It provides:
 * AWS Lambda deployment package
 * Self-executable jars (Using One-JAR)
 * "Skinny" jars (Jars which do not contain their dependencies)
-** Library jars
+* Library jars
 
 === What does conflict-less mean?
 

src/juxt/pack/api.clj

@@ -60,10 +60,12 @@
   
   Options
     :basis - required, basis to create library from
-    :path - required, location to output library to"
+    :path - required, location to output library to
+    :pom - input pom.xml, if provided will be copied to
+           META-INF/maven/<group>/<artifact>/pom.xml
+    :lib - required if :pom supplied, used to create pom.xml path"
   [params]
-  (skinny {:path (:path params)
-           :path-coerce :jar}))
+  ((requiring-resolve 'juxt.pack.library/library) params))
 
 (defn aws-lambda
   "Produce a zip file that can be uploaded to AWS lambda.  You will need to AOT

src/juxt/pack/cli/api.clj

@@ -68,10 +68,12 @@
   
   Options
     :basis - basis to use, if not provided will create a basis without :user
-    :path - required, location to output library to"
+    :path - required, location to output library to
+    :pom - input pom.xml, if provided will be copied to
+           META-INF/maven/<group>/<artifact>/pom.xml
+    :lib - required if :pom supplied, used to create pom.xml path"
   [{:keys [basis] :as params}]
-  (skinny {:path (:path params)
-           :path-coerce :jar}))
+  (pack/library (assoc params :basis (or basis (create-basis nil)))))
 
 (defn aws-lambda
   "Produce a zip file that can be uploaded to AWS lambda.  You will need to AOT

src/juxt/pack/library.clj

@@ -0,0 +1,28 @@
+(ns ^:no-doc juxt.pack.library
+  (:require
+    [clojure.java.io :as io]
+    [juxt.pack.impl.vfs :as vfs]))
+
+(defn write-paths
+  [basis output-path extra-paths]
+  (io/make-parents (io/file output-path))
+  (vfs/write-vfs
+    {:type :jar
+     :stream (io/output-stream output-path)}
+    (concat extra-paths
+            (mapcat
+              (fn [path]
+                (vfs/files-path
+                  (file-seq (io/file path))
+                  (io/file path)))
+              (keep
+                #(when (:path-key (val %))
+                   (key %))
+                (:classpath basis))))))
+
+(defn library
+  [{:keys [basis path pom lib]}]
+  (write-paths basis path
+               (when pom
+                 [{:path ["META-INF" "maven" (namespace lib) (name lib) "pom.xml"]
+                   :input (io/input-stream pom)}])))