Fix build: extract installMps task into separate build file

The Gradle build file imports Ant build.xml files, which
can't be parsed without first importing the correct
taskdefs, which are in turn located in MPS artefacts.

build.gradle

@@ -58,7 +58,6 @@ repositories {
 
 configurations {
     junitAnt
-    mps
 }
 
 dependencies {
@@ -67,45 +66,9 @@ dependencies {
   junitAnt('org.apache.ant:ant-junit:1.9.2') {
       transitive = false
   }
-
-  // MPS-related stuff declared as project properties
-  mps "org:${mpsBuildConfiguration}:${mpsBuildNumber}:${mpsBuildLabel}.tcbuildtag@zip"
-}
-
-task installMps(type: Copy)  {
-  onlyIf {
-    ! file('MPS_HOME').exists()
-  }
-
-  from zipTree(configurations.mps[0])
-  into 'MPS_HOME'
-
-  // Gradle woodoo for unzipping an archive
-  eachFile { FileCopyDetails fcp ->
-    // copy the contents of the directory named "MPS ${mpsRelease}"
-    if (fcp.relativePath.pathString.startsWith("MPS ${mpsRelease}/")) {
-      // remap the file to the root
-      def segments = fcp.relativePath.segments
-      def pathsegments = segments[1..-1] as String[]
-      fcp.relativePath = new RelativePath(!fcp.file.isDirectory(), pathsegments)
-
-    } else {
-      fcp.exclude()
-    }
-    // avoid overriding files
-    if (fcp.relativePath.getFile(destinationDir).exists()) {
-       it.exclude()
-    }
-  }
-  includeEmptyDirs = false
-}
-
-task deleteMps(type: Delete) {
-  delete 'MPS_HOME'
 }
 
 def allInitDependencies = [
-  'installMps',
   'coderules:solutions:jetbrains.mps.logic.reactor:copyDependencies',
   'coderules:solutions:jetbrains.mps.logic.test:copyDependencies',
   'coderules:solutions:jetbrains.mps.coderules.typechecking:copyDependencies',

dependencies.gradle

@@ -0,0 +1,83 @@
+import groovy.xml.MarkupBuilder
+import java.util.regex.*
+import java.util.zip.*
+import java.io.*
+import com.jetbrains.plugin.blockmap.core.BlockMap
+import com.jetbrains.plugin.blockmap.core.FileHash
+import com.fasterxml.jackson.databind.ObjectMapper
+
+buildscript {
+    repositories {
+       mavenCentral()
+    }
+    dependencies {
+       classpath group: 'org.jetbrains.intellij', name: 'blockmap', version: '1.0.5'
+       // https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind
+       classpath group: 'com.fasterxml.jackson.core', name: 'jackson-databind', version: '2.12.3'
+    }
+}
+
+defaultTasks 'installMps'
+
+allprojects {
+  apply plugin: 'java'
+
+  repositories {
+    mavenLocal()
+    mavenCentral()
+  }
+
+  // please no jars, no manifests, no build folders
+  jar { onlyIf { false } }
+}
+
+repositories {
+  ivy {
+      url 'https://teamcity.jetbrains.com/guestAuth/repository/download'
+      patternLayout {
+        ivy '[module]/[revision]/teamcity-ivy.xml'
+        artifact '[module]/[revision]/[revision].[ext]'
+      }
+  }
+}
+
+configurations {
+    mps
+}
+
+dependencies {
+  // MPS-related stuff declared as project properties
+  mps "org:${mpsBuildConfiguration}:${mpsBuildNumber}:${mpsBuildLabel}.tcbuildtag@zip"
+}
+
+task installMps(type: Copy)  {
+  onlyIf {
+    ! file('MPS_HOME').exists()
+  }
+
+  from zipTree(configurations.mps[0])
+  into 'MPS_HOME'
+
+  // Gradle woodoo for unzipping an archive
+  eachFile { FileCopyDetails fcp ->
+    // copy the contents of the directory named "MPS ${mpsRelease}"
+    if (fcp.relativePath.pathString.startsWith("MPS ${mpsRelease}/")) {
+      // remap the file to the root
+      def segments = fcp.relativePath.segments
+      def pathsegments = segments[1..-1] as String[]
+      fcp.relativePath = new RelativePath(!fcp.file.isDirectory(), pathsegments)
+
+    } else {
+      fcp.exclude()
+    }
+    // avoid overriding files
+    if (fcp.relativePath.getFile(destinationDir).exists()) {
+       it.exclude()
+    }
+  }
+  includeEmptyDirs = false
+}
+
+task deleteMps(type: Delete) {
+  delete 'MPS_HOME'
+}