Generate an executable via GraalVM ⚡

Install GraalVM (https://www.graalvm.org/) via SDKMAN! (https://sdkman.io/).

GraalVM is used to build a native image (executable) from the fat JAR.

Note: 'libsunec' native library (Sun Elliptic Curve crypto) needs to be in java.library.path, it is copied in current directory).

.gitignore

@@ -208,3 +208,5 @@ gradle-app.setting
 
 # End of https://www.gitignore.io/api/gradle,kotlin,eclipse,intellij,visualstudiocode
 /.idea/sonarIssues.xml
+/pullpitoK
+/libsunec.*

README.md

@@ -19,6 +19,16 @@ In order to show the 'usage':
 
     ./gradlew run --args "--help"
 
+## Install
+
+In order to generate a *nix executable, run:
+
+    ./generate-executable.sh
+
+An executable file named `pullpitoK` should be generated in the current directory. It can then be run:
+
+    ./pullpitoK
+
 ## Upgrade dependencies
 
     ./gradlew useLatestVersions

generate-executable.sh

@@ -0,0 +1,29 @@
+#!/bin/bash
+
+# Fail on error
+set -e
+
+echo "Build nicokosi/pullpitoK JAR file:"
+./gradlew shadowJar
+
+echo "Install GraalVM via SDKMAN!:"
+curl -s "https://get.sdkman.io" | bash || echo 'SDKMAN! already installed'
+source "$HOME/.sdkman/bin/sdkman-init.sh"
+GRAALVM_VERSION=1.0.0-rc-15-grl
+sdk install java $GRAALVM_VERSION
+sdk use java $GRAALVM_VERSION
+
+echo "Copy 'libsunec' shared library (Sun Elliptic Curve crypto):"
+cp $JAVA_HOME/jre/lib/libsunec* .
+
+echo "Build nicokosi/pullpitoK's executable from JAR via GraalVM:"
+native-image \
+   --no-server \
+   --verbose \
+   --enable-https \
+   -jar ./build/libs/pullpitoK-all.jar \
+   pullpitoK && \
+   echo ' => Check the executable: ' && ./pullpitoK
+
+echo "Executable has been generated, try it copy/pasting this command:"
+echo " GRAALVM_HOME=$GRAALVM_HOME ./pullpitoK python/peps"

src/main/kotlin/pullpitok/App.kt

@@ -7,6 +7,8 @@ import pullpitok.github.Type
 
 fun main(args: Array<String>) {
 
+    System.setProperty("java.library.path", System.getenv("GRAALVM_HOME") + "/jre/lib")
+
     if (!checkArgs(args)) System.exit(0)
     val repo = args[0]
     val token = args.getOrNull(1) ?: ""