Show more precise usage help for options/parameters with split regex

[remkop]

For example,

class Args {
    @Option(names = "-o", split = ",", paramLabel = "ARGS") List<String> options;
}

Usage help could show:

Usage: <main class> [-o=ARGS[,ARGS]...]...
 -o= ARGS[,ARGS]...

[remkop]

Index: src/main/java/picocli/CommandLine.java
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- src/main/java/picocli/CommandLine.java	(revision )
+++ src/main/java/picocli/CommandLine.java	(revision )
@@ -3173,9 +3173,11 @@
             public Text renderParameterLabel(Field field, Ansi ansi, List<IStyle> styles) {
                 boolean isOptionParameter = field.isAnnotationPresent(Option.class);
                 Range arity = isOptionParameter ? Range.optionArity(field) : Range.parameterArity(field);
+                String split = isOptionParameter ? field.getAnnotation(Option.class).split() : field.getAnnotation(Parameters.class).split();
                 Text result = ansi.new Text("");
                 String sep = isOptionParameter ? separator : "";
                 Text paramName = ansi.apply(renderParameterName(field), styles);
+                if (!empty(split)) { paramName = paramName.append("[" + split).append(paramName).append("]..."); } // #194
                 for (int i = 0; i < arity.min; i++) {
                     result = result.append(sep).append(paramName);
                     sep = " ";

[remkop]

Index: src/test/java/picocli/CommandLineHelpTest.java
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- src/test/java/picocli/CommandLineHelpTest.java	(revision )
+++ src/test/java/picocli/CommandLineHelpTest.java	(revision )
@@ -2286,22 +2286,24 @@
     @Test
     public void testMapFieldHelp() throws Exception {
         class App {
-            @Parameters(arity = "2", split = "\\|", type = {Integer.class, String.class},
+            @Parameters(arity = "2", split = "\\|",
                     paramLabel = "FIXTAG=VALUE",
                     description = "Exactly two lists of vertical bar '|'-separated FIXTAG=VALUE pairs.")
             Map<Integer,String> message;
 
-            @Option(names = {"-P", "-map"}, split = ",", type = {TimeUnit.class, String.class},
+            @Option(names = {"-P", "-map"}, split = ",",
                     paramLabel = "TIMEUNIT=VALUE",
                     description = "Any number of TIMEUNIT=VALUE pairs. These may be specified separately (-PTIMEUNIT=VALUE) or as a comma-separated list.")
             Map<TimeUnit, String> map;
         }
         String actual = usageString(new App(), Help.Ansi.OFF);
         String expected = String.format("" +
-                "Usage: <main class> [-P=TIMEUNIT=VALUE]... FIXTAG=VALUE FIXTAG=VALUE%n" +
+                "Usage: <main class> [-P=TIMEUNIT=VALUE[,TIMEUNIT=VALUE]...]... FIXTAG=VALUE%n" +
+                "                    [\\|FIXTAG=VALUE]... FIXTAG=VALUE[\\|FIXTAG=VALUE]...%n" +
                 "      FIXTAG=VALUE            Exactly two lists of vertical bar '|'-separated%n" +
                 "                                FIXTAG=VALUE pairs.%n" +
-                "  -P, -map=TIMEUNIT=VALUE     Any number of TIMEUNIT=VALUE pairs. These may be%n" +
+                "  -P, -map=TIMEUNIT=VALUE[,TIMEUNIT=VALUE]...%n" +
+                "                              Any number of TIMEUNIT=VALUE pairs. These may be%n" +
                 "                                specified separately (-PTIMEUNIT=VALUE) or as a%n" +
                 "                                comma-separated list.%n");
         assertEquals(expected, actual);