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JLine 3 Examples
Remko Popma edited this page Sep 19, 2020
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3 revisions
See the picocli-shell-jline3 README for general information about picocli-shell-jline3.
The following example requires JLine 3.13.2 or higher.
package picocli.shell.jline3.example;
import org.fusesource.jansi.AnsiConsole;
import org.jline.builtins.Builtins;
import org.jline.builtins.Completers.SystemCompleter;
import org.jline.builtins.Options.HelpException;
import org.jline.builtins.Widgets.CmdDesc;
import org.jline.builtins.Widgets.CmdLine;
import org.jline.builtins.Widgets.TailTipWidgets;
import org.jline.builtins.Widgets.TailTipWidgets.TipType;
import org.jline.reader.*;
import org.jline.reader.impl.DefaultParser;
import org.jline.reader.impl.LineReaderImpl;
import org.jline.terminal.Terminal;
import org.jline.terminal.TerminalBuilder;
import org.jline.utils.AttributedStringBuilder;
import org.jline.utils.AttributedStyle;
import picocli.CommandLine;
import picocli.CommandLine.ArgGroup;
import picocli.CommandLine.Command;
import picocli.CommandLine.Option;
import picocli.CommandLine.ParentCommand;
import picocli.shell.jline3.PicocliCommands;
import java.io.IOException;
import java.io.PrintWriter;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Arrays;
import java.util.concurrent.Callable;
import java.util.concurrent.TimeUnit;
/**
* Example that demonstrates how to build an interactive shell with JLine3 and picocli.
* @since 4.1.2
*/
public class Example {
/**
* Top-level command that just prints help.
*/
@Command(name = "",
description = {
"Example interactive shell with completion. " +
"Hit @|magenta <TAB>|@ to see available commands.",
"Type `@|bold,yellow keymap ^[s tailtip-toggle|@`, " +
"then hit @|magenta ALT-S|@ to toggle tailtips.",
""},
footer = {"", "Press Ctl-D to exit."},
subcommands = {
MyCommand.class, ClearScreen.class, CommandLine.HelpCommand.class})
static class CliCommands implements Runnable {
LineReaderImpl reader;
PrintWriter out;
CliCommands() {}
public void setReader(LineReader reader){
this.reader = (LineReaderImpl)reader;
out = reader.getTerminal().writer();
}
public void run() {
out.println(new CommandLine(this).getUsageMessage());
}
}
/**
* A command with some options to demonstrate completion.
*/
@Command(name = "cmd", mixinStandardHelpOptions = true, version = "1.0",
description = "Command with some options to demonstrate TAB-completion" +
" (note that enum values also get completed)",
subcommands = CommandLine.HelpCommand.class)
static class MyCommand implements Runnable {
@Option(names = {"-v", "--verbose"},
description = { "Specify multiple -v options to increase verbosity.",
"For example, `-v -v -v` or `-vvv`"})
private boolean[] verbosity = {};
@ArgGroup(exclusive = false)
private MyDuration myDuration = new MyDuration();
static class MyDuration {
@Option(names = {"-d", "--duration"},
description = "The duration quantity.",
required = true)
private int amount;
@Option(names = {"-u", "--timeUnit"},
description = "The duration time unit.",
required = true)
private TimeUnit unit;
}
@ParentCommand CliCommands parent;
public void run() {
if (verbosity.length > 0) {
parent.out.printf("Hi there. You asked for %d %s.%n",
myDuration.amount, myDuration.unit);
} else {
parent.out.println("hi!");
}
}
}
/**
* Command that clears the screen.
*/
@Command(name = "cls", aliases = "clear", mixinStandardHelpOptions = true,
description = "Clears the screen", version = "1.0")
static class ClearScreen implements Callable<Void> {
@ParentCommand CliCommands parent;
public Void call() throws IOException {
parent.reader.clearScreen();
return null;
}
}
/**
* Provide command descriptions for JLine TailTipWidgets
* to be displayed in the status bar.
*/
private static class DescriptionGenerator {
Builtins builtins;
PicocliCommands picocli;
public DescriptionGenerator(Builtins builtins, PicocliCommands picocli) {
this.builtins = builtins;
this.picocli = picocli;
}
CmdDesc commandDescription(CmdLine line) {
CmdDesc out = null;
switch (line.getDescriptionType()) {
case COMMAND:
String cmd = Parser.getCommand(line.getArgs().get(0));
if (builtins.hasCommand(cmd)) {
out = builtins.commandDescription(cmd);
} else if (picocli.hasCommand(cmd)) {
out = picocli.commandDescription(cmd);
}
break;
default:
break;
}
return out;
}
}
public static void main(String[] args) {
AnsiConsole.systemInstall();
try {
// set up JLine built-in commands
Path workDir = Paths.get("");
Builtins builtins = new Builtins(workDir, null, null);
builtins.rename(org.jline.builtins.Builtins.Command.TTOP, "top");
builtins.alias("zle", "widget");
builtins.alias("bindkey", "keymap");
SystemCompleter systemCompleter = builtins.compileCompleters();
// set up picocli commands
CliCommands commands = new CliCommands();
CommandLine cmd = new CommandLine(commands);
PicocliCommands picocliCommands = new PicocliCommands(workDir, cmd);
systemCompleter.add(picocliCommands.compileCompleters());
systemCompleter.compile();
Terminal terminal = TerminalBuilder.builder().build();
LineReader reader = LineReaderBuilder.builder()
.terminal(terminal)
.completer(systemCompleter)
.parser(new DefaultParser())
.variable(LineReader.LIST_MAX, 50) // max tab completion candidates
.build();
builtins.setLineReader(reader);
commands.setReader(reader);
DescriptionGenerator descriptionGenerator = new DescriptionGenerator(builtins, picocliCommands);
new TailTipWidgets(reader, descriptionGenerator::commandDescription, 5, TipType.COMPLETER);
String prompt = "prompt> ";
String rightPrompt = null;
// start the shell and process input until the user quits with Ctl-D
String line;
while (true) {
try {
line = reader.readLine(prompt, rightPrompt, (MaskingCallback) null, null);
if (line.matches("^\\s*#.*")) {
continue;
}
ParsedLine pl = reader.getParser().parse(line, 0);
String[] arguments = pl.words().toArray(new String[0]);
String command = Parser.getCommand(pl.word());
if (builtins.hasCommand(command)) {
builtins.execute(command, Arrays.copyOfRange(arguments, 1, arguments.length)
, System.in, System.out, System.err);
} else {
new CommandLine(commands).execute(arguments);
}
} catch (HelpException e) {
HelpException.highlight(e.getMessage(), HelpException.defaultStyle()).print(terminal);
} catch (UserInterruptException e) {
// Ignore
} catch (EndOfFileException e) {
return;
} catch (Exception e) {
AttributedStringBuilder asb = new AttributedStringBuilder();
asb.append(e.getMessage(), AttributedStyle.DEFAULT.foreground(AttributedStyle.RED));
asb.toAttributedString().println(terminal);
}
}
} catch (Throwable t) {
t.printStackTrace();
}
}
}Picocli 4.3.0 fixes an autocompletion issue with nested subcommands, thanks to a pull request by one of the JLine authors.
This requires JLine 3.14.1, and things need to wired up differently with the new version of the PicocliCommands completer.
Here is the updated example:
package picocli.shell.jline3.example;
import org.fusesource.jansi.AnsiConsole;
import org.jline.builtins.Builtins;
import org.jline.builtins.Widgets.TailTipWidgets;
import org.jline.builtins.Widgets.TailTipWidgets.TipType;
import org.jline.keymap.KeyMap;
import org.jline.builtins.SystemRegistry;
import org.jline.builtins.SystemRegistryImpl;
import org.jline.reader.*;
import org.jline.reader.impl.DefaultParser;
import org.jline.reader.impl.LineReaderImpl;
import org.jline.terminal.Terminal;
import org.jline.terminal.TerminalBuilder;
import picocli.CommandLine;
import picocli.CommandLine.ArgGroup;
import picocli.CommandLine.Command;
import picocli.CommandLine.Option;
import picocli.CommandLine.ParentCommand;
import picocli.shell.jline3.PicocliCommands;
import java.io.IOException;
import java.io.PrintWriter;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.concurrent.Callable;
import java.util.concurrent.TimeUnit;
/**
* Example that demonstrates how to build an interactive shell with JLine3 and picocli.
* @since 4.3.2
*/
public class Example {
/**
* Top-level command that just prints help.
*/
@Command(name = "",
description = {
"Example interactive shell with completion and autosuggestions. " +
"Hit @|magenta <TAB>|@ to see available commands.",
"Hit @|magenta ALT-S|@ to toggle tailtips.",
""},
footer = {"", "Press Ctl-D to exit."},
subcommands = {
MyCommand.class, ClearScreen.class, CommandLine.HelpCommand.class})
static class CliCommands implements Runnable {
LineReaderImpl reader;
PrintWriter out;
CliCommands() {}
public void setReader(LineReader reader){
this.reader = (LineReaderImpl)reader;
out = reader.getTerminal().writer();
}
public void run() {
out.println(new CommandLine(this).getUsageMessage());
}
}
/**
* A command with some options to demonstrate completion.
*/
@Command(name = "cmd", mixinStandardHelpOptions = true, version = "1.0",
description = {"Command with some options to demonstrate TAB-completion.",
" (Note that enum values also get completed.)"},
subcommands = {Nested.class, CommandLine.HelpCommand.class})
static class MyCommand implements Runnable {
@Option(names = {"-v", "--verbose"},
description = { "Specify multiple -v options to increase verbosity.",
"For example, `-v -v -v` or `-vvv`"})
private boolean[] verbosity = {};
@ArgGroup(exclusive = false)
private MyDuration myDuration = new MyDuration();
static class MyDuration {
@Option(names = {"-d", "--duration"},
description = "The duration quantity.",
required = true)
private int amount;
@Option(names = {"-u", "--timeUnit"},
description = "The duration time unit.",
required = true)
private TimeUnit unit;
}
@ParentCommand CliCommands parent;
public void run() {
if (verbosity.length > 0) {
parent.out.printf("Hi there. You asked for %d %s.%n",
myDuration.amount, myDuration.unit);
} else {
parent.out.println("hi!");
}
}
}
@Command(name = "nested", mixinStandardHelpOptions = true, subcommands = {CommandLine.HelpCommand.class},
description = "Hosts more sub-subcommands")
static class Nested implements Runnable {
public void run() {
System.out.println("I'm a nested subcommand. I don't do much, but I have sub-subcommands!");
}
@Command(mixinStandardHelpOptions = true, subcommands = {CommandLine.HelpCommand.class},
description = "Multiplies two numbers.")
public void multiply(@Option(names = {"-l", "--left"}, required = true) int left,
@Option(names = {"-r", "--right"}, required = true) int right) {
System.out.printf("%d * %d = %d%n", left, right, left * right);
}
@Command(mixinStandardHelpOptions = true, subcommands = {CommandLine.HelpCommand.class},
description = "Adds two numbers.")
public void add(@Option(names = {"-l", "--left"}, required = true) int left,
@Option(names = {"-r", "--right"}, required = true) int right) {
System.out.printf("%d + %d = %d%n", left, right, left + right);
}
@Command(mixinStandardHelpOptions = true, subcommands = {CommandLine.HelpCommand.class},
description = "Subtracts two numbers.")
public void subtract(@Option(names = {"-l", "--left"}, required = true) int left,
@Option(names = {"-r", "--right"}, required = true) int right) {
System.out.printf("%d - %d = %d%n", left, right, left - right);
}
}
/**
* Command that clears the screen.
*/
@Command(name = "cls", aliases = "clear", mixinStandardHelpOptions = true,
description = "Clears the screen", version = "1.0")
static class ClearScreen implements Callable<Void> {
@ParentCommand CliCommands parent;
public Void call() throws IOException {
parent.reader.clearScreen();
return null;
}
}
private static Path workDir() {
return Paths.get(System.getProperty("user.dir"));
}
public static void main(String[] args) {
AnsiConsole.systemInstall();
try {
// set up JLine built-in commands
Builtins builtins = new Builtins(Example::workDir, null, null);
builtins.rename(org.jline.builtins.Builtins.Command.TTOP, "top");
builtins.alias("zle", "widget");
builtins.alias("bindkey", "keymap");
// set up picocli commands
CliCommands commands = new CliCommands();
CommandLine cmd = new CommandLine(commands);
PicocliCommands picocliCommands = new PicocliCommands(Example::workDir, cmd);
Parser parser = new DefaultParser();
Terminal terminal = TerminalBuilder.builder().build();
SystemRegistry systemRegistry = new SystemRegistryImpl(parser, terminal, Example::workDir, null);
systemRegistry.setCommandRegistries(builtins, picocliCommands);
LineReader reader = LineReaderBuilder.builder()
.terminal(terminal)
.completer(systemRegistry.completer())
.parser(parser)
.variable(LineReader.LIST_MAX, 50) // max tab completion candidates
.build();
builtins.setLineReader(reader);
commands.setReader(reader);
new TailTipWidgets(reader, systemRegistry::commandDescription, 5, TipType.COMPLETER);
KeyMap<Binding> keyMap = reader.getKeyMaps().get("main");
keyMap.bind(new Reference("tailtip-toggle"), KeyMap.alt("s"));
String prompt = "prompt> ";
String rightPrompt = null;
// start the shell and process input until the user quits with Ctrl-D
String line;
while (true) {
try {
systemRegistry.cleanUp();
line = reader.readLine(prompt, rightPrompt, (MaskingCallback) null, null);
systemRegistry.execute(line);
} catch (UserInterruptException e) {
// Ignore
} catch (EndOfFileException e) {
return;
} catch (Exception e) {
systemRegistry.trace(e);
}
}
} catch (Throwable t) {
t.printStackTrace();
}
}
}package picocli.shell.jline3.example;
import org.fusesource.jansi.AnsiConsole;
import org.jline.builtins.Builtins;
import org.jline.builtins.Widgets.TailTipWidgets;
import org.jline.builtins.Widgets.TailTipWidgets.TipType;
import org.jline.keymap.KeyMap;
import org.jline.builtins.SystemRegistry;
import org.jline.builtins.SystemRegistryImpl;
import org.jline.reader.*;
import org.jline.reader.impl.DefaultParser;
import org.jline.reader.impl.LineReaderImpl;
import org.jline.terminal.Terminal;
import org.jline.terminal.TerminalBuilder;
import picocli.CommandLine;
import picocli.CommandLine.ArgGroup;
import picocli.CommandLine.Command;
import picocli.CommandLine.Option;
import picocli.CommandLine.ParentCommand;
import picocli.shell.jline3.PicocliCommands;
import java.io.IOException;
import java.io.PrintWriter;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.concurrent.Callable;
import java.util.concurrent.TimeUnit;
/**
* Example that demonstrates how to build an interactive shell with JLine3 and picocli.
* @since 4.5.1
*/
public class Example {
/**
* Top-level command that just prints help.
*/
@Command(name = "",
description = {
"Example interactive shell with completion and autosuggestions. " +
"Hit @|magenta <TAB>|@ to see available commands.",
"Hit @|magenta ALT-S|@ to toggle tailtips.",
""},
footer = {"", "Press Ctl-D to exit."},
subcommands = {
MyCommand.class, ClearScreen.class, CommandLine.HelpCommand.class})
static class CliCommands implements Runnable {
LineReaderImpl reader;
PrintWriter out;
CliCommands() {}
public void setReader(LineReader reader){
this.reader = (LineReaderImpl)reader;
out = reader.getTerminal().writer();
}
public void run() {
out.println(new CommandLine(this).getUsageMessage());
}
}
/**
* A command with some options to demonstrate completion.
*/
@Command(name = "cmd", mixinStandardHelpOptions = true, version = "1.0",
description = {"Command with some options to demonstrate TAB-completion.",
" (Note that enum values also get completed.)"},
subcommands = {Nested.class, CommandLine.HelpCommand.class})
static class MyCommand implements Runnable {
@Option(names = {"-v", "--verbose"},
description = { "Specify multiple -v options to increase verbosity.",
"For example, `-v -v -v` or `-vvv`"})
private boolean[] verbosity = {};
@ArgGroup(exclusive = false)
private MyDuration myDuration = new MyDuration();
static class MyDuration {
@Option(names = {"-d", "--duration"},
description = "The duration quantity.",
required = true)
private int amount;
@Option(names = {"-u", "--timeUnit"},
description = "The duration time unit.",
required = true)
private TimeUnit unit;
}
@ParentCommand CliCommands parent;
public void run() {
if (verbosity.length > 0) {
parent.out.printf("Hi there. You asked for %d %s.%n",
myDuration.amount, myDuration.unit);
} else {
parent.out.println("hi!");
}
}
}
@Command(name = "nested", mixinStandardHelpOptions = true, subcommands = {CommandLine.HelpCommand.class},
description = "Hosts more sub-subcommands")
static class Nested implements Runnable {
public void run() {
System.out.println("I'm a nested subcommand. I don't do much, but I have sub-subcommands!");
}
@Command(mixinStandardHelpOptions = true, subcommands = {CommandLine.HelpCommand.class},
description = "Multiplies two numbers.")
public void multiply(@Option(names = {"-l", "--left"}, required = true) int left,
@Option(names = {"-r", "--right"}, required = true) int right) {
System.out.printf("%d * %d = %d%n", left, right, left * right);
}
@Command(mixinStandardHelpOptions = true, subcommands = {CommandLine.HelpCommand.class},
description = "Adds two numbers.")
public void add(@Option(names = {"-l", "--left"}, required = true) int left,
@Option(names = {"-r", "--right"}, required = true) int right) {
System.out.printf("%d + %d = %d%n", left, right, left + right);
}
@Command(mixinStandardHelpOptions = true, subcommands = {CommandLine.HelpCommand.class},
description = "Subtracts two numbers.")
public void subtract(@Option(names = {"-l", "--left"}, required = true) int left,
@Option(names = {"-r", "--right"}, required = true) int right) {
System.out.printf("%d - %d = %d%n", left, right, left - right);
}
}
/**
* Command that clears the screen.
*/
@Command(name = "cls", aliases = "clear", mixinStandardHelpOptions = true,
description = "Clears the screen", version = "1.0")
static class ClearScreen implements Callable<Void> {
@ParentCommand CliCommands parent;
public Void call() throws IOException {
parent.reader.clearScreen();
return null;
}
}
private static Path workDir() {
return Paths.get(System.getProperty("user.dir"));
}
public static void main(String[] args) {
AnsiConsole.systemInstall();
try {
// set up JLine built-in commands
Builtins builtins = new Builtins(Example::workDir, null, null);
builtins.rename(org.jline.builtins.Builtins.Command.TTOP, "top");
builtins.alias("zle", "widget");
builtins.alias("bindkey", "keymap");
// set up picocli commands
CliCommands commands = new CliCommands();
CommandLine cmd = new CommandLine(commands);
PicocliCommands picocliCommands = new PicocliCommands(Example::workDir, cmd);
Parser parser = new DefaultParser();
try (Terminal terminal = TerminalBuilder.builder().build()) {
SystemRegistry systemRegistry = new SystemRegistryImpl(parser, terminal, Example::workDir, null);
systemRegistry.setCommandRegistries(builtins, picocliCommands);
LineReader reader = LineReaderBuilder.builder()
.terminal(terminal)
.completer(systemRegistry.completer())
.parser(parser)
.variable(LineReader.LIST_MAX, 50) // max tab completion candidates
.build();
builtins.setLineReader(reader);
commands.setReader(reader);
new TailTipWidgets(reader, systemRegistry::commandDescription, 5, TipType.COMPLETER);
KeyMap<Binding> keyMap = reader.getKeyMaps().get("main");
keyMap.bind(new Reference("tailtip-toggle"), KeyMap.alt("s"));
String prompt = "prompt> ";
String rightPrompt = null;
// start the shell and process input until the user quits with Ctrl-D
String line;
while (true) {
try {
systemRegistry.cleanUp();
line = reader.readLine(prompt, rightPrompt, (MaskingCallback) null, null);
systemRegistry.execute(line);
} catch (UserInterruptException e) {
// Ignore
} catch (EndOfFileException e) {
return;
} catch (Exception e) {
systemRegistry.trace(e);
}
}
}
} catch (Throwable t) {
t.printStackTrace();
} finally {
AnsiConsole.systemUninstall();
}
}
}