Document String array option type

- Fixes #628

spring-shell-docs/src/main/asciidoc/using-shell-options-types.adoc

@@ -117,3 +117,21 @@ include::{snippets}/OptionTypesSnippets.java[tag=option-type-enum-anno]
 include::{snippets}/OptionTypesSnippets.java[tag=option-type-enum-reg]
 ----
 ====
+
+==== Array
+
+Arrays can be used as is with strings and primitive types.
+
+====
+[source, java, indent=0]
+----
+include::{snippets}/OptionTypesSnippets.java[tag=option-type-string-array-anno]
+----
+====
+
+====
+[source, java, indent=0]
+----
+include::{snippets}/OptionTypesSnippets.java[tag=option-type-string-array-reg]
+----
+====

spring-shell-docs/src/test/java/org/springframework/shell/docs/OptionTypesSnippets.java

@@ -154,4 +154,29 @@ class OptionTypesSnippets {
 		}
 	}
 
+	class Dump5 {
+		// tag::option-type-string-array-anno[]
+		String example(@ShellOption(value = "arg1") String[] arg1) {
+			return "Hello " + arg1;
+		}
+		// end::option-type-string-array-anno[]
+		void dump() {
+		// tag::option-type-string-array-reg[]
+		CommandRegistration.builder()
+			.command("example")
+			.withOption()
+				.longNames("arg1")
+				.type(String[].class)
+				.required()
+				.and()
+			.withTarget()
+				.function(ctx -> {
+					String[] arg1 = ctx.getOptionValue("arg1");
+					return "Hello " + arg1;
+				})
+				.and()
+			.build();
+		// end::option-type-string-array-reg[]
+		}
+	}
 }

spring-shell-samples/src/main/java/org/springframework/shell/samples/e2e/BaseE2ECommands.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2022 the original author or authors.
+ * Copyright 2022-2023 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -15,6 +15,11 @@
  */
 package org.springframework.shell.samples.e2e;
 
+import java.util.stream.Collectors;
+import java.util.stream.IntStream;
+
+import org.springframework.util.StringUtils;
+
 /**
  * Base class for all e2e commands.
  *
@@ -25,4 +30,26 @@ abstract class BaseE2ECommands {
 	static final String GROUP = "E2E Commands";
 	static final String REG = "e2e reg";
 	static final String LEGACY_ANNO = "e2e anno ";
+
+	static String stringOfStrings(String[] values) {
+		return String.format("[%s]", StringUtils.arrayToCommaDelimitedString(values));
+	}
+
+	static String stringOfInts(int[] values) {
+		String joined = IntStream.range(0, values.length)
+			.mapToLong(i -> values[i])
+			.boxed()
+			.map(d -> d.toString())
+			.collect(Collectors.joining(","));
+		return String.format("[%s]", joined);
+	}
+
+	static String stringOfFloats(float[] values) {
+		String joined = IntStream.range(0, values.length)
+			.mapToDouble(i -> values[i])
+			.boxed()
+			.map(d -> d.toString())
+			.collect(Collectors.joining(","));
+		return String.format("[%s]", joined);
+	}
 }

spring-shell-samples/src/main/java/org/springframework/shell/samples/e2e/OptionTypeCommands.java

@@ -230,6 +230,65 @@ public class OptionTypeCommands extends BaseE2ECommands {
 			.build();
 	}
 
+	//
+	// String[]
+	//
+
+	@ShellMethod(key = LEGACY_ANNO + "option-type-string-array", group = GROUP)
+	public String optionTypeStringArrayAnnotation(
+		@ShellOption(help = "Desc arg1") String[] arg1
+	) {
+		return "Hello " + stringOfStrings(arg1);
+	}
+
+	@Bean
+	public CommandRegistration optionTypeStringArrayRegistration(CommandRegistration.BuilderSupplier builder) {
+		return builder.get()
+			.command(REG, "option-type-string-array")
+			.group(GROUP)
+			.withOption()
+				.longNames("arg1")
+				.type(String[].class)
+				.required()
+				.and()
+			.withTarget()
+				.function(ctx -> {
+					String[] arg1 = ctx.getOptionValue("arg1");
+					return "Hello " + stringOfStrings(arg1);
+				})
+				.and()
+			.build();
+	}
+	//
+	// int[]
+	//
+
+	@ShellMethod(key = LEGACY_ANNO + "option-type-int-array", group = GROUP)
+	public String optionTypeIntArrayAnnotation(
+		@ShellOption(help = "Desc arg1") int[] arg1
+	) {
+		return "Hello " + stringOfInts(arg1);
+	}
+
+	@Bean
+	public CommandRegistration optionTypeIntArrayRegistration(CommandRegistration.BuilderSupplier builder) {
+		return builder.get()
+			.command(REG, "option-type-int-array")
+			.group(GROUP)
+			.withOption()
+				.longNames("arg1")
+				.type(int[].class)
+				.required()
+				.and()
+			.withTarget()
+				.function(ctx -> {
+					int[] arg1 = ctx.getOptionValue("arg1");
+					return "Hello " + stringOfInts(arg1);
+				})
+				.and()
+			.build();
+	}
+
 	//
 	// Void
 	//