From 389340af4491be2cde4b1583cbb0fa2ca0e4484e Mon Sep 17 00:00:00 2001
From: Chris Beams <cbeams@gmail.com>
Date: Fri, 9 Jul 2010 14:57:15 +0200
Subject: [PATCH] improved clean* tasks

---
 buildSrc/release.gradle | 50 +++++++++++++++++++++++++++++------------
 1 file changed, 36 insertions(+), 14 deletions(-)

diff --git a/buildSrc/release.gradle b/buildSrc/release.gradle
index 8215a38b..55e06b67 100644
--- a/buildSrc/release.gradle
+++ b/buildSrc/release.gradle
@@ -145,26 +145,48 @@ task uploadDoc(type: TarUpload) {
     }
 }
 
-task(cleanDist) << {
-    dist.outputs.files.each { file ->
-        file.delete()
+task(cleanDist) {
+    onlyIf() {
+        anyOutputFilesExist = false
+        dist.outputs.files.each { file ->
+            if (file.canRead()) {
+                anyOutputFilesExist = true
+            }
+        }
+        return anyOutputFilesExist;
+    }
+    doLast() {
+        dist.outputs.files.each { file ->
+            file.delete()
+        }
     }
 }
 
-task(cleanApidocs) << {
-    // TODO: done quickly, clean this up
-    apidocs.destinationDir.deleteDir()
-    apidocs.tmpDir.deleteDir()
-    apidocs.outputs.files.each { file ->
-        file.delete()
+// TODO: done quickly, clean this up
+task(cleanApidocs) {
+    onlyIf() {
+        apidocs.destinationDir.isDirectory()
+    }
+    doLast() {
+        apidocs.destinationDir.deleteDir()
+        apidocs.tmpDir.deleteDir()
+        apidocs.outputs.files.each { file ->
+            file.delete()
+        }
     }
 }
 
-task('clean') << {
-    if(file(buildDir).listFiles()?.size() == 0) {
-        buildDir.delete()
-    } else {
-        println "did not remove [${buildDir}] as it is not empty"
+task('clean') {
+    onlyIf() {
+        file(buildDir).isDirectory()
+    }
+
+    doLast() {
+        if(file(buildDir).listFiles()?.size() == 0) {
+            buildDir.delete()
+        } else {
+            println "did not remove [${buildDir}] as it is not empty"
+        }
     }
 }
 clean.dependsOn cleanApidocs, cleanDist