mthmulders commented on code in PR #746:
URL: https://github.com/apache/maven/pull/746#discussion_r884137008


##########
maven-core/src/main/java/org/apache/maven/internal/MultilineMessageHelper.java:
##########
@@ -0,0 +1,91 @@
+package org.apache.maven.internal;
+
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Helper class to format multiline messages to the console
+ */
+public class MultilineMessageHelper
+{
+
+    private static final int DEFAULT_MAX_SIZE = 65;
+    private static final char BOX_CHAR = '*';
+
+    public static String separatorLine()
+    {
+        StringBuilder sb = new StringBuilder( DEFAULT_MAX_SIZE );
+        repeat( sb, '*', DEFAULT_MAX_SIZE );
+        return sb.toString();
+    }
+
+    public static List<String> format( String... lines )
+    {
+        int size = DEFAULT_MAX_SIZE;
+        int rem = size - 4; // 4 chars = 2 box_char + 2 spaces
+        List<String> result = new ArrayList<>();
+        StringBuilder sb = new StringBuilder( size );
+        // first line
+        sb.setLength( 0 );
+        repeat( sb, BOX_CHAR, size );
+        result.add( sb.toString() );
+        // lines
+        for ( String line : lines )
+        {
+            sb.setLength( 0 );
+            String[] words = line.split( " " );
+            for ( String word : words )
+            {
+                if ( sb.length() >= rem - word.length() - ( sb.length() > 0 ? 
1 : 0 ) )

Review Comment:
   What in the hypothetical case a word is longer than the line length? I guess 
it would never get printed?



##########
maven-core/src/main/java/org/apache/maven/lifecycle/internal/builder/BuilderCommon.java:
##########
@@ -141,35 +142,36 @@ public MavenExecutionPlan resolveBuildPlan( MavenSession 
session, MavenProject p
             final Set<Plugin> unsafePlugins = 
executionPlan.getNonThreadSafePlugins();
             if ( !unsafePlugins.isEmpty() )
             {
-                logger.warn( 
"*****************************************************************" );
-                logger.warn( "* Your build is requesting parallel execution, 
but project      *" );
-                logger.warn( "* contains the following plugin(s) that have 
goals not marked   *" );
-                logger.warn( "* as @threadSafe to support parallel building.   
               *" );
-                logger.warn( "* While this /may/ work fine, please look for 
plugin updates    *" );
-                logger.warn( "* and/or request plugins be made thread-safe.    
               *" );
-                logger.warn( "* If reporting an issue, report it against the 
plugin in        *" );
-                logger.warn( "* question, not against maven-core               
               *" );
-                logger.warn( 
"*****************************************************************" );
+                for ( String s : MultilineMessageHelper.format(
+                        "Your build is requesting parallel execution, but this 
project contains the following "
+                                + "plugin(s) that have goals not marked as 
@threadSafe to support parallel execution.",
+                        "While this /may/ work fine, please look for plugin 
updates and/or "
+                                + "request plugins be made thread-safe.",
+                        "If reporting an issue, report it against the plugin 
in question, not against Apache Maven." ) )
+                {
+                    logger.warn( s );
+                }
                 if ( logger.isDebugEnabled() )
                 {
                     final Set<MojoDescriptor> unsafeGoals = 
executionPlan.getNonThreadSafeMojos();
-                    logger.warn( "The following goals are not marked 
@threadSafe in " + project.getName() + ":" );
+                    logger.warn( "The following goals are not marked as 
@threadSafe in " + project.getName() + ":" );

Review Comment:
   Same as above.



##########
maven-core/src/main/java/org/apache/maven/lifecycle/internal/builder/BuilderCommon.java:
##########
@@ -141,35 +142,36 @@ public MavenExecutionPlan resolveBuildPlan( MavenSession 
session, MavenProject p
             final Set<Plugin> unsafePlugins = 
executionPlan.getNonThreadSafePlugins();
             if ( !unsafePlugins.isEmpty() )
             {
-                logger.warn( 
"*****************************************************************" );
-                logger.warn( "* Your build is requesting parallel execution, 
but project      *" );
-                logger.warn( "* contains the following plugin(s) that have 
goals not marked   *" );
-                logger.warn( "* as @threadSafe to support parallel building.   
               *" );
-                logger.warn( "* While this /may/ work fine, please look for 
plugin updates    *" );
-                logger.warn( "* and/or request plugins be made thread-safe.    
               *" );
-                logger.warn( "* If reporting an issue, report it against the 
plugin in        *" );
-                logger.warn( "* question, not against maven-core               
               *" );
-                logger.warn( 
"*****************************************************************" );
+                for ( String s : MultilineMessageHelper.format(
+                        "Your build is requesting parallel execution, but this 
project contains the following "
+                                + "plugin(s) that have goals not marked as 
@threadSafe to support parallel execution.",
+                        "While this /may/ work fine, please look for plugin 
updates and/or "
+                                + "request plugins be made thread-safe.",
+                        "If reporting an issue, report it against the plugin 
in question, not against Apache Maven." ) )
+                {
+                    logger.warn( s );
+                }
                 if ( logger.isDebugEnabled() )
                 {
                     final Set<MojoDescriptor> unsafeGoals = 
executionPlan.getNonThreadSafeMojos();
-                    logger.warn( "The following goals are not marked 
@threadSafe in " + project.getName() + ":" );
+                    logger.warn( "The following goals are not marked as 
@threadSafe in " + project.getName() + ":" );
                     for ( MojoDescriptor unsafeGoal : unsafeGoals )
                     {
-                        logger.warn( unsafeGoal.getId() );
+                        logger.warn( "  " + unsafeGoal.getId() );
                     }
                 }
                 else
                 {
-                    logger.warn( "The following plugins are not marked 
@threadSafe in " + project.getName() + ":" );
+                    logger.warn( "The following plugins are not marked as 
@threadSafe in " + project.getName() + ":" );

Review Comment:
   Same as above.



##########
maven-core/src/main/java/org/apache/maven/internal/MultilineMessageHelper.java:
##########
@@ -0,0 +1,91 @@
+package org.apache.maven.internal;
+
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Helper class to format multiline messages to the console
+ */
+public class MultilineMessageHelper
+{
+
+    private static final int DEFAULT_MAX_SIZE = 65;
+    private static final char BOX_CHAR = '*';
+
+    public static String separatorLine()
+    {
+        StringBuilder sb = new StringBuilder( DEFAULT_MAX_SIZE );
+        repeat( sb, '*', DEFAULT_MAX_SIZE );
+        return sb.toString();
+    }
+
+    public static List<String> format( String... lines )
+    {
+        int size = DEFAULT_MAX_SIZE;
+        int rem = size - 4; // 4 chars = 2 box_char + 2 spaces

Review Comment:
   Could we just name this 'remainder'? I don't think we have a limit on 
variable names, so better make them clear and descriptive IMO.



##########
maven-core/src/main/java/org/apache/maven/lifecycle/internal/builder/BuilderCommon.java:
##########
@@ -141,35 +142,36 @@ public MavenExecutionPlan resolveBuildPlan( MavenSession 
session, MavenProject p
             final Set<Plugin> unsafePlugins = 
executionPlan.getNonThreadSafePlugins();
             if ( !unsafePlugins.isEmpty() )
             {
-                logger.warn( 
"*****************************************************************" );
-                logger.warn( "* Your build is requesting parallel execution, 
but project      *" );
-                logger.warn( "* contains the following plugin(s) that have 
goals not marked   *" );
-                logger.warn( "* as @threadSafe to support parallel building.   
               *" );
-                logger.warn( "* While this /may/ work fine, please look for 
plugin updates    *" );
-                logger.warn( "* and/or request plugins be made thread-safe.    
               *" );
-                logger.warn( "* If reporting an issue, report it against the 
plugin in        *" );
-                logger.warn( "* question, not against maven-core               
               *" );
-                logger.warn( 
"*****************************************************************" );
+                for ( String s : MultilineMessageHelper.format(
+                        "Your build is requesting parallel execution, but this 
project contains the following "
+                                + "plugin(s) that have goals not marked as 
@threadSafe to support parallel execution.",

Review Comment:
   Nit: `@threadSafe` suggests the (old) Javadoc notation. Wouldn't it make 
more sense to do either `@ThreadSafe` or just "not marked as thread-safe" 
nowadays?



##########
maven-core/src/main/java/org/apache/maven/internal/MultilineMessageHelper.java:
##########
@@ -0,0 +1,91 @@
+package org.apache.maven.internal;
+
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Helper class to format multiline messages to the console
+ */
+public class MultilineMessageHelper
+{
+
+    private static final int DEFAULT_MAX_SIZE = 65;
+    private static final char BOX_CHAR = '*';
+
+    public static String separatorLine()
+    {
+        StringBuilder sb = new StringBuilder( DEFAULT_MAX_SIZE );
+        repeat( sb, '*', DEFAULT_MAX_SIZE );
+        return sb.toString();
+    }
+
+    public static List<String> format( String... lines )
+    {
+        int size = DEFAULT_MAX_SIZE;
+        int rem = size - 4; // 4 chars = 2 box_char + 2 spaces
+        List<String> result = new ArrayList<>();
+        StringBuilder sb = new StringBuilder( size );
+        // first line
+        sb.setLength( 0 );
+        repeat( sb, BOX_CHAR, size );
+        result.add( sb.toString() );
+        // lines
+        for ( String line : lines )
+        {
+            sb.setLength( 0 );
+            String[] words = line.split( " " );

Review Comment:
   `split` takes a regex param. Would it make sense to split on _all_ 
whitespace, e.g. `\s+`? Tab characters or multiple consecutive space characters 
would not cause more "words" to appear:
   
   ```
   jshell> "hello  world".split(" ");
   $1 ==> String[3] { "hello", "", "world" }
   
   jshell> "hello  world".split("\s");
   $2 ==> String[3] { "hello", "", "world" }
   
   jshell> "hello  world".split("\s+");
   $3 ==> String[2] { "hello", "world" }
   ```



##########
maven-core/src/main/java/org/apache/maven/lifecycle/internal/builder/BuilderCommon.java:
##########
@@ -141,35 +142,36 @@ public MavenExecutionPlan resolveBuildPlan( MavenSession 
session, MavenProject p
             final Set<Plugin> unsafePlugins = 
executionPlan.getNonThreadSafePlugins();
             if ( !unsafePlugins.isEmpty() )
             {
-                logger.warn( 
"*****************************************************************" );
-                logger.warn( "* Your build is requesting parallel execution, 
but project      *" );
-                logger.warn( "* contains the following plugin(s) that have 
goals not marked   *" );
-                logger.warn( "* as @threadSafe to support parallel building.   
               *" );
-                logger.warn( "* While this /may/ work fine, please look for 
plugin updates    *" );
-                logger.warn( "* and/or request plugins be made thread-safe.    
               *" );
-                logger.warn( "* If reporting an issue, report it against the 
plugin in        *" );
-                logger.warn( "* question, not against maven-core               
               *" );
-                logger.warn( 
"*****************************************************************" );
+                for ( String s : MultilineMessageHelper.format(
+                        "Your build is requesting parallel execution, but this 
project contains the following "
+                                + "plugin(s) that have goals not marked as 
@threadSafe to support parallel execution.",
+                        "While this /may/ work fine, please look for plugin 
updates and/or "
+                                + "request plugins be made thread-safe.",
+                        "If reporting an issue, report it against the plugin 
in question, not against Apache Maven." ) )
+                {
+                    logger.warn( s );
+                }
                 if ( logger.isDebugEnabled() )
                 {
                     final Set<MojoDescriptor> unsafeGoals = 
executionPlan.getNonThreadSafeMojos();
-                    logger.warn( "The following goals are not marked 
@threadSafe in " + project.getName() + ":" );
+                    logger.warn( "The following goals are not marked as 
@threadSafe in " + project.getName() + ":" );
                     for ( MojoDescriptor unsafeGoal : unsafeGoals )
                     {
-                        logger.warn( unsafeGoal.getId() );
+                        logger.warn( "  " + unsafeGoal.getId() );
                     }
                 }
                 else
                 {
-                    logger.warn( "The following plugins are not marked 
@threadSafe in " + project.getName() + ":" );
+                    logger.warn( "The following plugins are not marked as 
@threadSafe in " + project.getName() + ":" );
                     for ( Plugin unsafePlugin : unsafePlugins )
                     {
-                        logger.warn( unsafePlugin.getId() );
+                        logger.warn( "  " + unsafePlugin.getId() );
                     }
-                    logger.warn( "Enable verbose output (-X) to see more 
precisely which goals are not marked"
+                    logger.warn( "" );
+                    logger.warn( "Enable verbose output (-X) to see precisely 
which goals are not marked as"
                             + " @threadSafe." );

Review Comment:
   Same as above.



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