I have a Gradle project composed of several sub projects. I just created a new one to add support for an interactive Groovy shell that I would like to run with:
gradle console
or
gradle console:run
So my new console
module's build.gradle file is the following:
apply plugin: 'groovy'
apply plugin:'application'
mainClassName = 'org.codehaus.groovy.tools.shell.Main'
dependencies {
compile 'org.codehaus.groovy:groovy-all:2.2.2'
compile 'org.fusesource.jansi:jansi:1.11'
compile 'commons-cli:commons-cli:1.2'
compile 'jline:jline:2.11'
compile project(':my-module')
}
task(console, dependsOn: 'classes', type: JavaExec) {
main = 'org.codehaus.groovy.tools.shell.Main'
classpath = sourceSets.main.runtimeClasspath
}
However, when I run gradle :console:run
or gradle console
I get something like:
:console:run
Groovy Shell (2.2.2, JVM: 1.6.0_45)
Type 'help' or '\h' for help.
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
groovy:000>
BUILD SUCCESSFUL
Total time: 4.529 secs
giovanni@mylaptop:~/Projects/my-project$
So the interactive shell seems to start but it exits right away.
Am I doing something wrong?
EDIT : Added the following to the build.gradle file:
run.standardInput = System.in
Now the standard input gets read from the input stream (thanks to the comments).
However, Gradle seems to get stuck on this:
Groovy Shell (2.2.2, JVM: 1.6.0_45)
Type 'help' or '\h' for help.
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
groovy:000>
> Building 88% > :console:run
And no input gets accepted. Even this leads to the same thing:
gradle --no-daemon console:run
UPDATE 2018:
Dylons accepted answer don't seem to work anymore, ./gradlew console
exits immediately:
$ ./gradlew console
Configure project : The Task.leftShift(Closure) method has been deprecated and is scheduled to be removed in Gradle 5.0. Please use Task.doLast(Action) instead. at build_8qb2gvs00xed46ejq1p63fo92.run(/home/jhe052/eclipse-workspace/QuinCe/build.gradle:118) (Run with --stacktrace to get the full stack trace of this deprecation warning.)
BUILD SUCCESSFUL in 3s 3 actionable tasks: 1 executed, 2 up-to-date
Replacing the leftShift (<<) with doLast gets rid of the deprecated message but with the same result. Version info:
$ ./gradlew --version
Gradle 4.4.1
Build time: 2017-12-20 15:45:23 UTC Revision: 10ed9dc355dc39f6307cc98fbd8cea314bdd381c
Groovy: 2.4.12 Ant: Apache Ant(TM) version 1.9.9 compiled on February 2 2017 JVM: 1.8.0_151 (Oracle Corporation 25.151-b12) OS: Linux 4.13.0-32-generic amd64
This works for JDK 7+ (for JDK 6, look at the next figure):
configurations {
console
}
dependencies {
// ... compile dependencies, runtime dependencies, etc.
console 'commons-cli:commons-cli:1.2'
console('jline:jline:2.11') {
exclude(group: 'junit', module: 'junit')
}
console 'org.codehaus.groovy:groovy-groovysh:2.2.+'
}
task(console, dependsOn: 'classes') << {
def classpath = sourceSets.main.runtimeClasspath + configurations.console
def command = [
'java',
'-cp', classpath.collect().join(System.getProperty('path.separator')),
'org.codehaus.groovy.tools.shell.Main',
'--color'
]
def proc = new ProcessBuilder(command)
.redirectOutput(ProcessBuilder.Redirect.INHERIT)
.redirectInput(ProcessBuilder.Redirect.INHERIT)
.redirectError(ProcessBuilder.Redirect.INHERIT)
.start()
proc.waitFor()
if (0 != proc.exitValue()) {
throw new RuntimeException("console exited with status: ${proc.exitValue()}")
}
}
To make this work for JDK 6, I modified the solution from https://stackoverflow.com/a/4274535/206543 . My solution is tailored to a standard Linux terminal, so if you are running a shell that uses a char sequence other than '\\n' for newlines or that encodes backspaces as a value other other 127, you may need to modify it some. I didn't determine how to make colors print correctly, so its output is rather monotone, but it will get the job done:
configurations {
console
}
dependencies {
// ... compile dependencies, runtime dependencies, etc.
console 'commons-cli:commons-cli:1.2'
console('jline:jline:2.11') {
exclude(group: 'junit', module: 'junit')
}
console 'org.codehaus.groovy:groovy-groovysh:2.2.+'
}
class StreamCopier implements Runnable {
def istream
def ostream
StreamCopier(istream, ostream) {
this.istream = istream
this.ostream = ostream
}
void run() {
int n
def buffer = new byte[4096]
while ((n = istream.read(buffer)) != -1) {
ostream.write(buffer, 0, n)
ostream.flush()
}
}
}
class InputCopier implements Runnable {
def istream
def ostream
def stdout
InputCopier(istream, ostream, stdout) {
this.istream = istream
this.ostream = ostream
this.stdout = stdout
}
void run() {
try {
int n
def buffer = java.nio.ByteBuffer.allocate(4096)
while ((n = istream.read(buffer)) != -1) {
ostream.write(buffer.array(), 0, n)
ostream.flush()
buffer.clear()
if (127 == buffer.get(0)) {
stdout.print("\b \b")
stdout.flush()
}
}
}
catch (final java.nio.channels.AsynchronousCloseException exception) {
// Ctrl+D pressed
}
finally {
ostream.close()
}
}
}
def getChannel(istream) {
def f = java.io.FilterInputStream.class.getDeclaredField("in")
f.setAccessible(true)
while (istream instanceof java.io.FilterInputStream) {
istream = f.get(istream)
}
istream.getChannel()
}
task(console, dependsOn: 'classes') << {
def classpath = sourceSets.main.runtimeClasspath + configurations.console
def command = [
'java',
'-cp', classpath.collect().join(System.getProperty('path.separator')),
'org.codehaus.groovy.tools.shell.Main'
]
def proc = new ProcessBuilder(command).start()
def stdout = new Thread(new StreamCopier(proc.getInputStream(), System.out))
stdout.start()
def stderr = new Thread(new StreamCopier(proc.getErrorStream(), System.err))
stderr.start()
def stdin = new Thread(new InputCopier(
getChannel(System.in),
proc.getOutputStream(),
System.out))
stdin.start()
proc.waitFor()
System.in.close()
stdout.join()
stderr.join()
stdin.join()
if (0 != proc.exitValue()) {
throw new RuntimeException("console exited with status: ${proc.exitValue()}")
}
}
Then, execute it via:
gradle console
or, if you get a lot of noise from gradle:
gradle console -q
I created a gradle plugin that allowed this ( https://github.com/tkruse/gradle-groovysh-plugin ). Sadly gradle does not provide a useful API / contract for IO that supports a REPL, so the plugin does not work with newer versions of Gradle.
However, in the docs on github you can find a manual solution without a plugin .
The outline of that solution is:
package shell;
import org.codehaus.groovy.tools.shell.Main;
import org.fusesource.jansi.AnsiConsole;
class ShellMain {
public static void main(String[] args) {
// workaround for jAnsi problems, (backspace and arrow keys not working)
AnsiConsole.systemUninstall();
Main.main(args);
}
}
Then Use a JavaExec task to run this
apply plugin: 'java'
dependencies {
compile('commons-cli:commons-cli:1.2')
compile('org.codehaus.groovy:groovy-all:2.4.4') { force = true }
// when using groovy < 2.2 above: "jline:jline:1.0"
compile("jline:jline:2.11") {
exclude(group: 'junit', module: 'junit')
}
}
task shell(dependsOn: 'testClasses', type: JavaExec) {
doFirst {
if (getProperty('org.gradle.daemon') == 'true') {
throw new IllegalStateException('Do not run shell with gradle daemon, it will eat your arrow keys.')
}
}
standardInput = System.in
main = 'shell.ShellMain'
classpath = sourceSets.main.runtimeClasspath
jvmArgs = []
}
Gradle doesn't currently handle ncurses style console applications well. Either run groovysh
in a separate console, or run groovyConsole
instead.
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