Adding ability to compile for Raspberry Pi. #45

DEVELOPER.md

@@ -13,7 +13,7 @@ $ ./gradlew test
 ## Building
 
 ```
-$ ./gradlew assemble
+$ ./gradlew clean assemble
 
 BUILD SUCCESSFUL in 2s
 6 actionable tasks: 6 executed
@@ -44,3 +44,42 @@ To launch the GUI version of AppleCommander, use the following:
 * Mac OS X:
   `java -XstartOnFirstThread -jar build/libs/AppleCommander-macosx-VERSION.jar`
   
+## Raspberry Pi Notes
+
+Available versions found are: `3.8` and `4.6`. `4.6` failed with a JNI issue.
+
+Retrieve libraries:
+
+```
+$ sudo apt install libswt-gtk-3-java libswt-gtk-3-jni
+```
+
+Combine into one JAR (`-j` drops the directories from `*.so` files in the zip file):
+
+```
+$ cp /usr/lib/java/swt-gtk-3.8.2.jar org.eclipse.swt.gtk.linux.arm-3.8.2.jar
+$ zip -j org.eclipse.swt.gtk.linux.arm-3.8.2.jar /usr/lib/jni/libswt-*3836*.so 
+```
+
+Preserve JAR file in `rpi-lib`!  If the file name is incorrect, the build process will show the expected filename in the error message...
+
+Error for 4.6:
+
+```
+** (SWT:12220): CRITICAL **: 15:12:55.506: JNI method ID pointer is NULL for method atkObject_get_role
+
+java.lang.reflect.InvocationTargetException
+    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
+    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
+    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
+    at java.lang.reflect.Method.invoke(Method.java:498)
+    at com.webcodepro.applecommander.ui.AppleCommander.launchSwtAppleCommander(AppleCommander.java:103)
+    at com.webcodepro.applecommander.ui.AppleCommander.main(AppleCommander.java:57)
+Caused by: java.lang.NoSuchMethodError: atkObject_get_role
+    at org.eclipse.swt.internal.gtk.OS._g_main_context_iteration(Native Method)
+    at org.eclipse.swt.internal.gtk.OS.g_main_context_iteration(OS.java:1581)
+    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:4470)
+    at com.webcodepro.applecommander.ui.swt.SwtAppleCommander.launch(SwtAppleCommander.java:93)
+    at com.webcodepro.applecommander.ui.swt.SwtAppleCommander.launch(SwtAppleCommander.java:79)
+    ... 6 more
+```

build.gradle

@@ -8,9 +8,13 @@ plugins {
 repositories {
     mavenCentral()
     maven {
-        // SWT libraries
+        // SWT libraries (historical, need a better site)
         url "http://maven-eclipse.github.io/maven"
     }
+    flatDir {
+        // SWT libraries (hand-generated SWT for Pi)
+        dirs "./rpi-lib"
+    }
 }
 
 mainClassName = 'com.webcodepro.applecommander.ui.AppleCommander'
@@ -22,13 +26,18 @@ compileJava {
 }
 
 test {
+    String osName = System.getProperty('os.name').toLowerCase().split()[0]
+    String osArch = System.getProperty('os.arch').toLowerCase().split()[0]
     String swtDependency
-    switch (System.getProperty('os.name').toLowerCase().split()[0]) {
+    switch (osName) {
         case 'windows':
             swtDependency = "org.eclipse.swt:org.eclipse.swt.win32.win32.x86_64:$swtVersion"
             break
         case 'linux':
             swtDependency = "org.eclipse.swt:org.eclipse.swt.gtk.linux.x86_64:$swtVersion"
+            if (osArch == 'arm') {
+                swtDependency = "org.eclipse.swt:org.eclipse.swt.gtk.linux.arm:$piswtVersion"
+            }
             break
         case 'mac':
             swtDependency = "org.eclipse.swt:org.eclipse.swt.cocoa.macosx.x86_64:$swtVersion"
@@ -116,7 +125,20 @@ task linuxJar(type: Jar) {
     }
     doFirst {
         // Pick and include just the Linux JAR contents
-        from { configurations.runtime.collect { it.name.contains('.linux.') ? zipTree(it) : 'fake' } } 
+        from { configurations.runtime.collect { it.name.contains('.linux.x86_64-') ? zipTree(it) : 'fake' } } 
+    } 
+}
+task piJar(type: Jar) {
+    dependencies {
+        compile "org.eclipse.swt:org.eclipse.swt.gtk.linux.arm:$piswtVersion"
+    }
+    appendix 'linuxarm-gtk'
+    from(sourceSets.main.output) {
+        include 'com/webcodepro/**'
+    }
+    doFirst {
+        // Pick and include just the Linux JAR contents
+        from { configurations.runtime.collect { it.name.contains('.linux.arm-') ? zipTree(it) : 'fake' } } 
     } 
 }
 task macosxJar(type: Jar) {
@@ -162,7 +184,7 @@ javadoc {
 
 artifacts {
     archives mavenJar, acJar 
-    archives linuxJar, macosxJar, windowsJar
+    archives linuxJar, piJar, macosxJar, windowsJar
     archives javadocJar, sourcesJar
 }
 

gradle.properties

@@ -8,6 +8,7 @@ shkVersion=1.2.2
 asVersion=1.2.1
 btVersion=0.3.1
 swtVersion=4.6.1
+piswtVersion=3.8.2
 junitVersion=4.12
 antVersion=1.8.2
 commonsLang3Version=3.7