# HG changeset patch
# User rfield
# Date 1512500682 28800
# Node ID e2065f7505eb7c12aa2fd380c7de89bfd8d4d0d2
# Parent  128de6a38f8eb3b5afa5a03ed0acc81bc9890db6
8192979: jshell tool: Online help text for commands is confusing
Reviewed-by: jlahoda

diff -r 128de6a38f8e -r e2065f7505eb src/jdk.jshell/share/classes/jdk/internal/jshell/tool/JShellTool.java
--- a/src/jdk.jshell/share/classes/jdk/internal/jshell/tool/JShellTool.java	Mon Dec 04 17:15:38 2017 -0800
+++ b/src/jdk.jshell/share/classes/jdk/internal/jshell/tool/JShellTool.java	Tue Dec 05 11:04:42 2017 -0800
@@ -227,6 +227,8 @@
     static final String BUILTIN_FILE_PATH_FORMAT = "/jdk/jshell/tool/resources/%s.jsh";
     static final String INT_PREFIX = "int $$exit$$ = ";
 
+    static final int OUTPUT_WIDTH = 72;
+
     // match anything followed by whitespace
     private static final Pattern OPTION_PRE_PATTERN =
             Pattern.compile("\\s*(\\S+\\s+)*?");
@@ -2347,17 +2349,14 @@
                         return false;
                     }
                     if (!which.equals("_blank")) {
-                        hardrb("help.set." + which);
+                        printHelp("/set " + which, "help.set." + which);
                         return true;
                     }
                 }
             }
             if (matches.length > 0) {
                 for (Command c : matches) {
-                    hard("");
-                    hard("%s", c.command);
-                    hard("");
-                    hardrb(c.helpKey);
+                    printHelp(c.command, c.helpKey);
                 }
                 return true;
             } else {
@@ -2368,8 +2367,7 @@
                         .toArray(String[]::new);
                 if (subs.length > 0) {
                     for (String sub : subs) {
-                        hardrb("help.set." + sub);
-                        hard("");
+                        printHelp("/set " + sub, "help.set." + sub);
                     }
                     return true;
                 }
@@ -2391,6 +2389,16 @@
         return true;
     }
 
+    private void printHelp(String name, String key) {
+        int len = name.length();
+        String centered = "%" + ((OUTPUT_WIDTH + len) / 2) + "s";
+        hard("");
+        hard(centered, name);
+        hard(centered, Stream.generate(() -> "=").limit(len).collect(Collectors.joining()));
+        hard("");
+        hardrb(key);
+    }
+
     private boolean cmdHistory() {
         cmdout.println();
         for (String s : input.currentSessionHistory()) {
diff -r 128de6a38f8e -r e2065f7505eb test/langtools/jdk/jshell/ToolSimpleTest.java
--- a/test/langtools/jdk/jshell/ToolSimpleTest.java	Mon Dec 04 17:15:38 2017 -0800
+++ b/test/langtools/jdk/jshell/ToolSimpleTest.java	Tue Dec 05 11:04:42 2017 -0800
@@ -23,7 +23,7 @@
 
 /*
  * @test
- * @bug 8153716 8143955 8151754 8150382 8153920 8156910 8131024 8160089 8153897 8167128 8154513 8170015 8170368 8172102 8172103  8165405 8173073 8173848 8174041 8173916 8174028 8174262 8174797 8177079 8180508 8177466 8172154
+ * @bug 8153716 8143955 8151754 8150382 8153920 8156910 8131024 8160089 8153897 8167128 8154513 8170015 8170368 8172102 8172103  8165405 8173073 8173848 8174041 8173916 8174028 8174262 8174797 8177079 8180508 8177466 8172154 8192979
  * @summary Simple jshell tool tests
  * @modules jdk.compiler/com.sun.tools.javac.api
  *          jdk.compiler/com.sun.tools.javac.main
@@ -370,6 +370,20 @@
     }
 
     @Test
+    public void testHelpStart() {
+        test(
+                (a) -> assertCommandCheckOutput(a, "/help /exit",
+                        s -> assertTrue(s.replaceAll("\\r\\n?", "\n").startsWith(
+                                "|  \n" +
+                                "|                                   /exit\n" +
+                                "|                                   =====\n" +
+                                "|  "
+                        ))
+                )
+        );
+    }
+
+    @Test
     public void testHelpFormat() {
         test(
                 (a) -> assertCommandCheckOutput(a, "/help", s -> {