add classifier as an argument

pkgs/build-support/fetchmavenartifact/default.nix

@@ -17,6 +17,8 @@ args@
   artifactId
 , # Example: "4.3.6"
   version
+, # Example: "jdk11"
+  classifier ? null
 , # List of maven repositories from where to fetch the artifact.
   # Example: [ http://oss.sonatype.org/content/repositories/public ].
   repos ? defaultRepos
@@ -36,28 +38,19 @@ assert (repos != []) || (url != "") || (urls != []);
 
 
 let
-  classifierSplit =
-    with stdenv.lib.strings;
-      splitString "$" artifactId;
-  artifactId_ = builtins.head classifierSplit;
-  classifier =
-    with stdenv.lib;
-      if builtins.length classifierSplit > 1
-      then concatStrings ["-" (builtins.elemAt classifierSplit 1)]
-      else "";
   name_ =
     with stdenv.lib; concatStrings [
       (replaceChars ["."] ["_"] groupId) "_"
-      (replaceChars ["."] ["_"] artifactId_) "-"
+      (replaceChars ["."] ["_"] artifactId) "-"
       version
     ];
   mkJarUrl = repoUrl:
     with stdenv.lib; concatStringsSep "/" [
       (removeSuffix "/" repoUrl)
       (replaceChars ["."] ["/"] groupId)
-      artifactId_
+      artifactId
       version
-      "${artifactId_}-${version}${classifier}.jar"
+      "${artifactId}-${version}-${optionalString (!isNull classifier) "-${classifier}"}.jar"
     ];
   urls_ =
     if url != "" then [url]
@@ -65,8 +58,8 @@ let
     else map mkJarUrl repos;
   jar =
     fetchurl (
-      builtins.removeAttrs args ["groupId" "artifactId" "version" "repos" "url" ]
-        // { urls = urls_; name = "${name_}${classifier}.jar"; }
+      builtins.removeAttrs args ["groupId" "artifactId" "version" "classifier" "repos" "url" ]
+        // { urls = urls_; name = "${name_}.jar"; }
     );
 in
   stdenv.mkDerivation {
@@ -76,7 +69,7 @@ in
     # packages packages that mention this derivation in their buildInputs.
     installPhase = ''
       mkdir -p $out/share/java
-      ln -s ${jar} $out/share/java/${artifactId_}-${version}${classifier}.jar
+      ln -s ${jar} $out/share/java/${artifactId}-${version}.jar
     '';
     # We also add a `jar` attribute that can be used to easily obtain the path
     # to the downloaded jar file.