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/*
* Copyright 2010-2016 JetBrains s.r.o.
*
* Licensed 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.
*/
package org.jetbrains.kotlin.cli.common;
import com.sampullara.cli.Argument;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.jetbrains.kotlin.cli.common.arguments.CommonCompilerArguments;
import org.jetbrains.kotlin.cli.common.arguments.ValueDescription;
import java.io.PrintStream;
import java.lang.reflect.Field;
class Usage {
// The magic number 29 corresponds to the similar padding width in javac and scalac command line compilers
private static final int OPTION_NAME_PADDING_WIDTH = 29;
private static final String coroutinesKeyDescription = "Enable coroutines or report warnings or errors on declarations and use sites of 'suspend' modifier";
public static void print(@NotNull PrintStream target, @NotNull CommonCompilerArguments arguments, boolean extraHelp) {
target.println("Usage: " + arguments.executableScriptFileName() + " ");
target.println("where " + (extraHelp ? "advanced" : "possible") + " options include:");
boolean coroutinesUsagePrinted = false;
for (Class clazz = arguments.getClass(); clazz != null; clazz = clazz.getSuperclass()) {
for (Field field : clazz.getDeclaredFields()) {
String usage = fieldUsage(field, extraHelp);
if (usage != null) {
boolean coroutinesUsage = usage.contains("Xcoroutines");
if (coroutinesUsage && coroutinesUsagePrinted) {
continue;
} else if (coroutinesUsage) {
coroutinesUsagePrinted = true;
}
target.println(usage);
}
}
}
if (extraHelp) {
target.println();
target.println("Advanced options are non-standard and may be changed or removed without any notice.");
}
}
@Nullable
private static String fieldUsage(@NotNull Field field, boolean extraHelp) {
Argument argument = field.getAnnotation(Argument.class);
if (argument == null) return null;
ValueDescription description = field.getAnnotation(ValueDescription.class);
String argumentValue = argument.value();
// TODO: this is a dirty hack, provide better mechanism for keys that can have several values
boolean isXCoroutinesKey = argumentValue.contains("Xcoroutines");
String value = isXCoroutinesKey ? "Xcoroutines={enable|warn|error}" : argument.value();
boolean extraOption = value.startsWith("X") && value.length() > 1;
if (extraHelp != extraOption) return null;
String prefix = argument.prefix();
StringBuilder sb = new StringBuilder(" ");
sb.append(prefix);
sb.append(value);
if (!argument.alias().isEmpty()) {
sb.append(" (");
sb.append(prefix);
sb.append(argument.alias());
sb.append(")");
}
if (description != null) {
sb.append(" ");
sb.append(description.value());
}
if (isXCoroutinesKey) {
sb.append(" ");
sb.append(coroutinesKeyDescription);
}
int width = OPTION_NAME_PADDING_WIDTH - 1;
if (sb.length() >= width + 5) { // Break the line if it's too long
sb.append("\n");
width += sb.length();
}
while (sb.length() < width) {
sb.append(" ");
}
sb.append(" ");
sb.append(argument.description());
return sb.toString();
}
}
