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com.aspectran.shell.command.option.HelpFormatter Maven / Gradle / Ivy
/*
* Copyright (c) 2008-2023 The Aspectran Project
*
* 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 com.aspectran.shell.command.option;
import com.aspectran.core.util.StringUtils;
import com.aspectran.shell.command.Command;
import com.aspectran.shell.console.Console;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.StringReader;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Comparator;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
/**
* A formatter of help messages for command line options.
*/
public class HelpFormatter {
private static final String NEW_LINE = System.lineSeparator();
/** Default number of characters per line */
public static final int DEFAULT_WIDTH = 76;
/** Default number of characters per line */
public static final int DEFAULT_MAX_LEFT_WIDTH = 15;
/** Default padding to the left of each line */
public static final int DEFAULT_LEFT_PAD = 3;
/** number of space characters to be prefixed to each description line */
public static final int DEFAULT_DESC_PAD = 3;
/** the string to display at the beginning of the usage statement */
private static final String DEFAULT_SYNTAX_PREFIX = "Usage: ";
/** Default name for an argument */
private static final String DEFAULT_ARG_NAME = "arg";
/** Default prefix for shortOpts */
public static final String OPTION_PREFIX = "-";
/** Default prefix for long Option */
public static final String LONG_OPTION_PREFIX = "--";
/** Default separator displayed between a long Option and its value */
private static final String LONG_OPTION_SEPARATOR = " ";
/** The opening pointy bracket to wrap an argument */
private static final String ARG_BRACKET_OPEN = "<";
/** The closing pointy bracket to wrap an argument */
private static final String ARG_BRACKET_CLOSE = ">";
/** The opening square bracket to indicate optional option or argument */
private static final String OPTIONAL_BRACKET_OPEN = "[";
/** The closing square bracket to indicate optional option or argument */
private static final String OPTIONAL_BRACKET_CLOSE = "]";
private int width = DEFAULT_WIDTH;
private int maxLeftWidth = DEFAULT_MAX_LEFT_WIDTH;
private int leftPad = DEFAULT_LEFT_PAD;
private int descPad = DEFAULT_DESC_PAD;
private String syntaxPrefix = DEFAULT_SYNTAX_PREFIX;
private String argName = DEFAULT_ARG_NAME;
/**
* Comparator used to sort the options when they output in help text.
* Defaults to case-insensitive alphabetical sorting by option key.
*/
private Comparator optionComparator;
private final Console console;
/**
* Creates a help formatter.
*
* @param console the console to which the help will be written
*/
public HelpFormatter(Console console) {
this.console = console;
}
public int getWidth() {
return width;
}
public void setWidth(int width) {
this.width = width;
}
public int getMaxLeftWidth() {
return maxLeftWidth;
}
public void setMaxLeftWidth(int maxLeftWidth) {
this.maxLeftWidth = maxLeftWidth;
}
public int getLeftPad() {
return leftPad;
}
public void setLeftPad(int leftPad) {
this.leftPad = leftPad;
}
public int getDescPad() {
return descPad;
}
public void setDescPad(int descPad) {
this.descPad = descPad;
}
public String getSyntaxPrefix() {
return syntaxPrefix;
}
public void setSyntaxPrefix(String prefix) {
this.syntaxPrefix = prefix;
}
public String getArgName() {
return argName;
}
public void setArgName(String name) {
this.argName = name;
}
/**
* Comparator used to sort the options when they output in help text.
* Defaults to case-insensitive alphabetical sorting by option key.
*
* @return the {@link Comparator} currently in use to sort the options
*/
public Comparator getOptionComparator() {
return optionComparator;
}
/**
* Set the comparator used to sort the options when they output in help text.
* Passing in a null comparator will keep the options in the order they were declared.
*
* @param comparator the {@link Comparator} to use for sorting the options
*/
public void setOptionComparator(Comparator comparator) {
this.optionComparator = comparator;
}
/**
* Print the help with the given Command object.
*
* @param command the Command instance
*/
public void printHelp(Command command) {
if (command.getDescriptor().getUsage() != null) {
printUsage(command.getDescriptor().getUsage());
} else {
printUsage(command);
}
int leftWidth = printOptions(command.getOptions());
printArguments(command.getArgumentsList(), leftWidth);
}
/**
* Print the help for {@code options} with the specified
* command line syntax.
*
* @param cmdLineSyntax the usage statement
*/
public void printUsage(String cmdLineSyntax) {
int nextLineTabStop = getSyntaxPrefix().length() + cmdLineSyntax.indexOf(' ') + 1;
printWrapped( + nextLineTabStop, getSyntaxPrefix() + cmdLineSyntax);
}
/**
* Prints the usage statement for the specified command.
*
* @param command the Command instance
*/
public void printUsage(Command command) {
String commandName = command.getDescriptor().getName();
StringBuilder sb = new StringBuilder(getSyntaxPrefix()).append(commandName).append(" ");
// create a list for processed option groups
Collection processedGroups = new ArrayList<>();
Collection optList = command.getOptions().getAllOptions();
if (optList.size() > 1 && getOptionComparator() != null) {
List optList2 = new ArrayList<>(optList);
optList2.sort(getOptionComparator());
optList = optList2;
}
for (Iterator it = optList.iterator(); it.hasNext();) {
// get the next Option
Option option = it.next();
// check if the option is part of an OptionGroup
OptionGroup group = command.getOptions().getOptionGroup(option);
if (group != null) {
// if the group has not already been processed
if (!processedGroups.contains(group)) {
// add the group to the processed list
processedGroups.add(group);
// add the usage clause
appendOptionGroup(sb, group);
}
// otherwise the option was displayed in the group
// previously so ignore it.
}
// if the Option is not part of an OptionGroup
else {
appendOption(sb, option, option.isRequired());
}
if (it.hasNext()) {
sb.append(" ");
}
}
for (Arguments arguments : command.getArgumentsList()) {
sb.append(" ");
appendArguments(sb, arguments);
}
printWrapped(getSyntaxPrefix().length() + commandName.length() + 1, sb.toString());
}
/**
* Appends the usage clause for an OptionGroup to a StringBuilder.
* The clause is wrapped in square brackets if the group is required.
* The display of the options is handled by appendOption.
*
* @param sb the StringBuilder to append to
* @param group the group to append
*/
private void appendOptionGroup(StringBuilder sb, OptionGroup group) {
if (!group.isRequired()) {
sb.append(OPTIONAL_BRACKET_OPEN);
}
List optList = new ArrayList<>(group.getOptions());
if (optList.size() > 1 && getOptionComparator() != null) {
optList.sort(getOptionComparator());
}
// for each option in the OptionGroup
for (Iterator it = optList.iterator(); it.hasNext();) {
// whether the option is required or not is handled at group level
appendOption(sb, it.next(), true);
if (it.hasNext()) {
sb.append(" | ");
}
}
if (!group.isRequired()) {
sb.append(OPTIONAL_BRACKET_CLOSE);
}
}
/**
* Appends the usage clause for an Option to a StringBuilder.
*
* @param sb the StringBuilder to append to
* @param option the Option to append
* @param required whether the Option is required or not
*/
private void appendOption(StringBuilder sb, Option option, boolean required) {
if (!required) {
sb.append(OPTIONAL_BRACKET_OPEN);
}
if (option.getName() != null) {
sb.append(OPTION_PREFIX).append(option.getName());
} else {
sb.append(LONG_OPTION_PREFIX).append(option.getLongName());
}
// if the Option has a value and a non blank arg name
if (option.hasValue() && (option.getValueName() == null || !option.getValueName().isEmpty())) {
sb.append(option.isWithEqualSign() ? '=' : LONG_OPTION_SEPARATOR);
sb.append(ARG_BRACKET_OPEN).append(option.getValueName() != null ? option.getValueName() : getArgName()).append(ARG_BRACKET_CLOSE);
}
if (!required) {
sb.append(OPTIONAL_BRACKET_CLOSE);
}
}
private void appendArguments(StringBuilder sb, Arguments arguments) {
if (!arguments.isRequired()) {
sb.append(OPTIONAL_BRACKET_OPEN);
}
sb.append(ARG_BRACKET_OPEN);
for (Iterator it = arguments.keySet().iterator(); it.hasNext();) {
String name = it.next();
if (name.startsWith(ARG_BRACKET_OPEN) && name.endsWith(ARG_BRACKET_CLOSE)) {
name = name.substring(1, name.length() - 1);
}
sb.append(name);
if (it.hasNext()) {
sb.append("|");
}
}
sb.append(ARG_BRACKET_CLOSE);
if (!arguments.isRequired()) {
sb.append(OPTIONAL_BRACKET_CLOSE);
}
}
/**
* Print the help for the specified Options to the specified writer,
* using the specified width, left padding and description padding.
*
* @param options the Options instance
* @return the longest opt string's length
*/
public int printOptions(Options options) {
Collection optList = options.getAllOptions();
StringBuilder sb = new StringBuilder();
int leftWidth = 0;
if (!options.isEmpty()) {
leftWidth = renderOptions(sb, optList);
if (sb.length() > 0) {
if (StringUtils.hasLength(options.getTitle())) {
console.writeLine(options.getTitle());
}
console.writeLine(sb.toString());
}
}
return leftWidth;
}
public void printArguments(List argumentsList, int leftWidth) {
StringBuilder sb = new StringBuilder();
for (Arguments arguments : argumentsList) {
renderArguments(sb, arguments, leftWidth);
if (sb.length() > 0) {
if (StringUtils.hasLength(arguments.getTitle())) {
console.writeLine(arguments.getTitle());
}
console.write(sb.toString());
sb.setLength(0);
}
}
}
/**
* Print the specified text to the specified PrintWriter.
*
* @param text the text to be written to the PrintWriter
*/
public void printWrapped(String text) {
printWrapped(0, text);
}
/**
* Print the specified text to the specified PrintWriter.
*
* @param nextLineTabStop the position on the next line for the first tab
* @param text the text to be written to the PrintWriter
*/
private void printWrapped(int nextLineTabStop, String text) {
StringBuilder sb = new StringBuilder(text.length());
renderWrappedTextBlock(sb, nextLineTabStop, text);
console.writeLine(sb.toString());
}
/**
* Render the specified Options and return the rendered Options
* in a StringBuilder.
*
* @param sb the StringBuilder to place the rendered Options into
* @param options the command line Options
* @return the longest opt string's length
*/
private int renderOptions(StringBuilder sb, Collection options) {
String lpad = OptionUtils.createPadding(getLeftPad());
String dpad = OptionUtils.createPadding(getDescPad());
// first create list containing only -a,--aaa where
// -a is opt and --aaa is long opt; in parallel look for
// the longest opt string this list will be then used to
// sort options ascending
int leftWidth = 0;
List lineBufList = new ArrayList<>();
Collection optList = options;
if (optList.size() > 1 && getOptionComparator() != null) {
List optList2 = new ArrayList<>(optList);
optList2.sort(getOptionComparator());
optList = optList2;
}
for (Option option : optList) {
StringBuilder lineBuf = new StringBuilder();
if (option.getName() == null) {
lineBuf.append(lpad).append(LONG_OPTION_PREFIX).append(option.getLongName());
} else {
lineBuf.append(lpad).append(OPTION_PREFIX).append(option.getName());
if (option.hasLongName()) {
lineBuf.append(", ").append(LONG_OPTION_PREFIX).append(option.getLongName());
}
}
if (option.hasValue()) {
String argName = option.getValueName();
if (argName != null && argName.isEmpty()) {
// if the option has a blank arg name
lineBuf.append(' ');
} else {
lineBuf.append(option.isWithEqualSign() ? '=' : LONG_OPTION_SEPARATOR);
lineBuf.append(ARG_BRACKET_OPEN).append(argName != null ? argName : getArgName()).append(ARG_BRACKET_CLOSE);
}
}
lineBufList.add(lineBuf);
leftWidth = (lineBuf.length() > leftWidth ? lineBuf.length() : leftWidth);
}
if (leftWidth > getMaxLeftWidth()) {
leftWidth = getMaxLeftWidth();
}
int x = 0;
for (Iterator it = optList.iterator(); it.hasNext();) {
Option option = it.next();
StringBuilder lineBuf = lineBufList.get(x++);
if (lineBuf.length() <= leftWidth) {
if (lineBuf.length() < leftWidth) {
lineBuf.append(OptionUtils.createPadding(leftWidth - lineBuf.length()));
}
lineBuf.append(dpad);
if (option.getDescription() != null) {
lineBuf.append(option.getDescription());
}
renderWrappedText(sb, getWidth(), leftWidth + getDescPad(), lineBuf.toString());
} else {
sb.append(lineBuf).append(NEW_LINE);
if (option.getDescription() != null) {
String line = OptionUtils.createPadding(leftWidth + getDescPad()) + option.getDescription();
renderWrappedText(sb, getWidth(), leftWidth + getDescPad(), line);
}
}
if (it.hasNext()) {
sb.append(NEW_LINE);
}
}
return leftWidth;
}
private void renderArguments(StringBuilder sb, Arguments arguments, int leftWidth) {
String lpad = OptionUtils.createPadding(getLeftPad());
String dpad = OptionUtils.createPadding(getDescPad());
int max = leftWidth;
for (String arg : arguments.keySet()) {
if (getLeftPad() + arg.length() > max) {
max = getLeftPad() + arg.length();
}
}
if (max > getMaxLeftWidth()) {
max = getMaxLeftWidth();
}
for (Map.Entry entry : arguments.entrySet()) {
String arg = entry.getKey();
String desc = entry.getValue();
StringBuilder buf = new StringBuilder(lpad).append(arg);
if (buf.length() <= max) {
if (buf.length() < max) {
buf.append(OptionUtils.createPadding(max - buf.length()));
}
buf.append(dpad);
if (desc != null) {
buf.append(desc);
}
renderWrappedText(sb, getWidth(), max + getDescPad(), buf.toString());
} else {
sb.append(buf).append(NEW_LINE);
if (desc != null) {
String line = OptionUtils.createPadding(max + getDescPad()) + desc;
renderWrappedText(sb, getWidth(), max + getDescPad(), line);
}
}
sb.append(NEW_LINE);
}
}
/**
* Render the specified text width a maximum width. This method differs
* from renderWrappedText by not removing leading spaces after a new line.
*
* @param sb the StringBuilder to place the rendered text into
* @param nextLineTabStop the position on the next line for the first tab
* @param text the text to be rendered
*/
private void renderWrappedTextBlock(StringBuilder sb, int nextLineTabStop, String text) {
try {
BufferedReader in = new BufferedReader(new StringReader(text));
String line;
boolean firstLine = true;
while ((line = in.readLine()) != null) {
if (!firstLine) {
sb.append(NEW_LINE);
} else {
firstLine = false;
}
renderWrappedText(sb, getWidth(), nextLineTabStop, line);
}
} catch (IOException e) {
// ignore
}
}
/**
* Render the specified text and return the rendered Options
* in a StringBuilder.
*
* @param sb the StringBuilder to place the rendered text into
* @param width the number of characters to display per line
* @param nextLineTabStop the position on the next line for the first tab
* @param text the text to be rendered
*/
public static void renderWrappedText(StringBuilder sb, int width, int nextLineTabStop, String text) {
int pos = OptionUtils.findWrapPos(text, width, 0);
if (pos == -1) {
sb.append(OptionUtils.rtrim(text));
return;
}
sb.append(OptionUtils.rtrim(text.substring(0, pos))).append(NEW_LINE);
if (nextLineTabStop >= width) {
// stops infinite loop happening
nextLineTabStop = 1;
}
// all following lines must be padded with nextLineTabStop space characters
String padding = OptionUtils.createPadding(nextLineTabStop);
String line = text;
while (true) {
line = padding + line.substring(pos).trim();
pos = OptionUtils.findWrapPos(line, width, 0);
if (pos == -1) {
sb.append(line);
return;
}
if (line.length() > width && pos == nextLineTabStop - 1) {
pos = width;
}
sb.append(OptionUtils.rtrim(line.substring(0, pos))).append(NEW_LINE);
}
}
}
