build/org.eclipse.cdt.meson.ui/src/org/eclipse/cdt/meson/ui/properties/MesonPropertyPage.java - cdt/org.eclipse.cdt - Git at Google

 /*******************************************************************************
  * Copyright (c) 2016,2018 IAR Systems AB
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  *     IAR Systems - initial API and implementation
  *     Red Hat Inc. - modified for use in Meson build
  *******************************************************************************/
 package org.eclipse.cdt.meson.ui.properties;

 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.io.OutputStream;
 import java.io.UnsupportedEncodingException;
 import java.nio.charset.StandardCharsets;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;

 import org.eclipse.cdt.core.CCorePlugin;
 import org.eclipse.cdt.core.CommandLauncherManager;
 import org.eclipse.cdt.core.ICommandLauncher;
 import org.eclipse.cdt.core.build.CBuildConfiguration;
 import org.eclipse.cdt.core.build.ICBuildCommandLauncher;
 import org.eclipse.cdt.core.build.ICBuildConfiguration;
 import org.eclipse.cdt.core.resources.IConsole;
 import org.eclipse.cdt.meson.core.IMesonConstants;
 import org.eclipse.cdt.meson.ui.Activator;
 import org.eclipse.core.resources.IProject;
 import org.eclipse.core.runtime.CoreException;
 import org.eclipse.core.runtime.IPath;
 import org.eclipse.core.runtime.NullProgressMonitor;
 import org.eclipse.core.runtime.Path;
 import org.eclipse.jface.dialogs.MessageDialog;
 import org.eclipse.osgi.util.NLS;
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.layout.GridData;
 import org.eclipse.swt.layout.GridLayout;
 import org.eclipse.swt.widgets.Composite;
 import org.eclipse.swt.widgets.Control;
 import org.eclipse.swt.widgets.Display;
 import org.eclipse.swt.widgets.Group;
 import org.eclipse.swt.widgets.Label;
 import org.eclipse.swt.widgets.Text;
 import org.eclipse.ui.dialogs.PropertyPage;

 /**
  * Property page for Meson projects.  For unconfigured projects, we use the meson command and parse
  * the output of the --help option.  Otherwise, we use the meson configure command to find current
  * options and what may be changed via a meson configure call.
  *
  * We assume that the build directory is in project/build/configname, which is where
  * the CMake project wizard puts it. We also assume that "cmake-gui" is in the user's
  * PATH.
  */
 public class MesonPropertyPage extends PropertyPage {

 	private IProject project;
 	private List<IMesonPropertyPageControl> componentList = new ArrayList<>();
 	private boolean configured;
 	private CBuildConfiguration buildConfig;
 	private Text envText;
 	private Text projText;

 	@Override
 	protected Control createContents(Composite parent) {
 		Composite composite = new Composite(parent, SWT.NONE);
 		composite.setLayoutData(new GridData(GridData.FILL_BOTH));
 		composite.setLayout(new GridLayout(1, true));

 		project = (IProject) getElement();
 		String configName;
 		try {
 			buildConfig = ((CBuildConfiguration)project.getActiveBuildConfig().getAdapter(ICBuildConfiguration.class));
 			configName = ((CBuildConfiguration)project.getActiveBuildConfig().getAdapter(ICBuildConfiguration.class)).getName();
 			IPath sourceDir = project.getLocation();
 			String buildDir = project.getLocation().append("build").append(configName).toOSString(); //$NON-NLS-1$
 			IPath buildPath = new Path(buildDir).append("build.ninja"); //$NON-NLS-1$
 			configured = buildPath.toFile().exists();
 			if (configured) {

 				ICommandLauncher launcher = CommandLauncherManager.getInstance().getCommandLauncher(project.getActiveBuildConfig().getAdapter(ICBuildConfiguration.class));
 				launcher.setProject(project);
 				if (launcher instanceof ICBuildCommandLauncher) {
 					((ICBuildCommandLauncher)launcher).setBuildConfiguration(buildConfig);
 				}
 				Process p = launcher.execute(new Path("meson"), new String[] { "configure", buildDir}, //$NON-NLS-1$ //$NON-NLS-2$
 						new String[0], sourceDir, new NullProgressMonitor());
 				if (p != null) {
 					ByteArrayOutputStream stdout = new ByteArrayOutputStream();
 					ByteArrayOutputStream stderr = new ByteArrayOutputStream();
 					int rc = -1;
 					try {
 						if (launcher.waitAndRead(stdout, stderr, new NullProgressMonitor()) == ICommandLauncher.OK) {
 							p.waitFor();
 						}
 						rc = p.exitValue();
 					} catch (InterruptedException e) {
 						// ignore for now
 					}
 					if (rc == 0) {
 						componentList = parseConfigureOutput(stdout, composite);
 					}
 				}
 			} else {
 				ICommandLauncher launcher = CommandLauncherManager.getInstance().getCommandLauncher(project.getActiveBuildConfig().getAdapter(ICBuildConfiguration.class));
 				launcher.setProject(project);
 				if (launcher instanceof ICBuildCommandLauncher) {
 					((ICBuildCommandLauncher)launcher).setBuildConfiguration(buildConfig);
 				}
 				Process p = launcher.execute(new Path("meson"), new String[] { "-h"}, //$NON-NLS-1$ //$NON-NLS-2$
 						new String[0], sourceDir, new NullProgressMonitor());
 				if (p == null) {
 					return null;
 				}
 				ByteArrayOutputStream stdout = new ByteArrayOutputStream();
 				ByteArrayOutputStream stderr = new ByteArrayOutputStream();
 				int rc = -1;
 				try {
 					if (launcher.waitAndRead(stdout, stderr, new NullProgressMonitor()) == ICommandLauncher.OK) {
 						p.waitFor();
 					}
 					rc = p.exitValue();
 				} catch (InterruptedException e) {
 					// ignore for now
 				}
 				if (rc == 0) {
 					Map<String, String> argMap = new HashMap<>();
 					String mesonArgs = buildConfig.getProperty(IMesonConstants.MESON_ARGUMENTS);
 					if (mesonArgs != null) {
 						String[] argStrings = mesonArgs.split("--"); //$NON-NLS-1$
 						for (String argString : argStrings) {
 							if (!argString.isEmpty()) {
 								String[] s = argString.split("="); //$NON-NLS-1$
 								if (s.length == 2) {
 									argMap.put(s[0], s[1].trim());
 								} else {
 									argMap.put(argString.trim(), "true"); //$NON-NLS-1$
 								}
 							}
 						}
 					}

 					Group group = new Group(composite, SWT.BORDER);
 					GridLayout layout = new GridLayout(2, true);
 					layout.marginLeft = 10;
 					layout.marginRight = 10;
 					group.setLayout(layout);
 					group.setLayoutData(new GridData(GridData.FILL_BOTH));
 					group.setText(Messages.MesonPropertyPage_env_group);

 					Label envLabel = new Label(group, SWT.NONE);
 					envLabel.setText(Messages.MesonPropertyPage_env_label);
 					GridData data = new GridData(GridData.FILL, GridData.FILL, true, false);
 					data.grabExcessHorizontalSpace = true;
 					data.horizontalSpan = 1;
 					envLabel.setLayoutData(data);


 					String mesonEnv = buildConfig.getProperty(IMesonConstants.MESON_ENV);

 					envText = new Text(group, SWT.BORDER);
 					if (mesonEnv != null) {
 						envText.setText(mesonEnv);
 					}
 					envText.setToolTipText(Messages.MesonPropertyPage_env_tooltip);
 					data = new GridData(GridData.FILL, GridData.FILL, true, false);
 					data.grabExcessHorizontalSpace = true;
 					data.horizontalSpan = 1;
 					envText.setLayoutData(data);

 					group = new Group(composite, SWT.BORDER);
 					layout = new GridLayout(2, true);
 					layout.marginLeft = 10;
 					layout.marginRight = 10;
 					group.setLayout(layout);
 					group.setLayoutData(new GridData(GridData.FILL_BOTH));
 					group.setText(Messages.MesonPropertyPage_project_group);

 					Label projLabel = new Label(group, SWT.NONE);
 					projLabel.setText(Messages.MesonPropertyPage_project_label);
 					data = new GridData(GridData.FILL, GridData.FILL, true, false);
 					data.grabExcessHorizontalSpace = true;
 					data.horizontalSpan = 1;
 					projLabel.setLayoutData(data);

 					String mesonProjOptions = buildConfig.getProperty(IMesonConstants.MESON_PROJECT_OPTIONS);

 					projText = new Text(group, SWT.BORDER);
 					if (mesonProjOptions != null) {
 						projText.setText(mesonProjOptions);
 						}
 					projText.setToolTipText(Messages.MesonPropertyPage_project_tooltip);
 					data = new GridData(GridData.FILL, GridData.FILL, true, false);
 					data.grabExcessHorizontalSpace = true;
 					data.horizontalSpan = 1;
 					projText.setLayoutData(data);

 					// default buildtype based on active build configuration
 					// user can always override and we will use override from then on
 					String defaultBuildType = "release"; //$NON-NLS-1$
 					if (configName.contains("debug")) { //$NON-NLS-1$
 						defaultBuildType = "debug"; //$NON-NLS-1$
 					}
 				    if (argMap.get("buildtype") == null) { //$NON-NLS-1$
 				    	argMap.put("buildtype", defaultBuildType); //$NON-NLS-1$
 				    }
 					componentList = parseHelpOutput(stdout, composite, argMap, defaultBuildType);
 				}
 			}
 		} catch (CoreException e2) {
 			// TODO Auto-generated catch block
 			e2.printStackTrace();
 		}

 		return composite;
 	}

 	public void update() {
 		setErrorMessage(null);
 		for (IMesonPropertyPageControl control : componentList) {
 			if (!control.isValid()) {
 				setValid(false);
 				setErrorMessage(control.getErrorMessage());
 			}
 		}
 	}

 	public enum ParseState {
 		INIT, GROUP, OPTION, OPTION_WITH_VALUES, ARGS
 	};

 	@Override
 	public boolean performOk() {
 		List<String> args = new ArrayList<>();
 		if (configured) {
 			args.add("configure"); //$NON-NLS-1$
 			for (IMesonPropertyPageControl control : componentList) {
 				if (control.isValueChanged()) {
 					args.add(control.getConfiguredString()); //$NON-NLS-1$ //$NON-NLS-2$
 				}
 			}
 			if (args.size() == 2) {
 				return true;
 			}
 			try {
 				String configName = ((CBuildConfiguration)project.getActiveBuildConfig().getAdapter(ICBuildConfiguration.class)).getName();
 				IPath sourceDir = project.getLocation();
 				String buildDir = project.getLocation().append("build").append(configName).toOSString(); //$NON-NLS-1$
 				ICommandLauncher launcher = CommandLauncherManager.getInstance().getCommandLauncher(project.getActiveBuildConfig().getAdapter(ICBuildConfiguration.class));
 				launcher.setProject(project);
 				if (launcher instanceof ICBuildCommandLauncher) {
 					((ICBuildCommandLauncher)launcher).setBuildConfiguration(buildConfig);
 				}
 				args.add(buildDir);
 				Process p = launcher.execute(new Path("meson"), args.toArray(new String[0]), new String[0], sourceDir, new NullProgressMonitor()); //$NON-NLS-1$ //$NON-NLS-2$
 				int rc = -1;
 				IConsole console = CCorePlugin.getDefault().getConsole();
 				console.start(project);
 				try (OutputStream stdout = console.getOutputStream()) {
 					OutputStream stderr = stdout;
 					StringBuilder buf = new StringBuilder();
 					for (String arg : args) {
 						buf.append(arg);
 						buf.append(" "); //$NON-NLS-1$
 					}
 					buf.append(System.lineSeparator());
 					stdout.write(buf.toString().getBytes());
 					stdout.flush();
 					try {

 						if (launcher.waitAndRead(stdout, stderr, new NullProgressMonitor()) == ICommandLauncher.OK) {
 							p.waitFor();
 						}
 						rc = p.exitValue();
 						stdout.write(NLS.bind(Messages.MesonPropertyPage_terminated_rc, rc).getBytes());
 						stdout.flush();
 						if (rc != 0) {
 							Display.getDefault().syncExec(() -> {
 								MessageDialog.openError(getShell(), null, Messages.MesonPropertyPage_configure_failed);
 							});
 						}
 					} catch (InterruptedException e) {
 						// ignore for now
 					}
 				} catch (IOException e2) {
 					Activator.log(e2);
 					return false;
 				}
 			} catch (CoreException e3) {
 				// TODO Auto-generated catch block
 				Activator.log(e3);
 				return false;
 			}
 		} else {
 			StringBuilder mesonargs = new StringBuilder();
 			for (IMesonPropertyPageControl control : componentList) {
 				if (!control.getUnconfiguredString().isEmpty()) {
 					mesonargs.append(control.getUnconfiguredString());
 					mesonargs.append(" "); //$NON-NLS-1$
 				}
 			}
 			buildConfig.setProperty(IMesonConstants.MESON_ARGUMENTS, mesonargs.toString());
 			buildConfig.setProperty(IMesonConstants.MESON_ENV, envText.getText().trim());
 			buildConfig.setProperty(IMesonConstants.MESON_PROJECT_OPTIONS, projText.getText().trim());
 		}
 		return true;
 	}
 	/**
 	 * Parse output of meson help call to determine options to show to user
 	 * @param stdout - ByteArrayOutputStream containing output of command
 	 * @param composite - Composite to add Controls to
 	 * @return - list of Controls
 	 */
 	List<IMesonPropertyPageControl> parseHelpOutput(ByteArrayOutputStream stdout, Composite composite, Map<String, String> argMap, String defaultBuildType) {
 		List<IMesonPropertyPageControl> controls = new ArrayList<>();

 		Group group = new Group(composite, SWT.BORDER);
 		GridLayout layout = new GridLayout(2, true);
 		layout.marginLeft = 10;
 		layout.marginRight = 10;
 		group.setLayout(layout);
 		group.setLayoutData(new GridData(GridData.FILL_BOTH));
 		group.setText(Messages.MesonPropertyPage_options_group);

 		try {
 			String output = stdout.toString(StandardCharsets.UTF_8.name()).replaceAll("\\r?\\n\\s+", " "); //$NON-NLS-1$ //$NON-NLS-2$
 			String[] lines = output.split("--"); //$NON-NLS-1$
 			Pattern optionPattern = Pattern.compile("(([a-z-]+)\\s+(([A-Z_][A-Z_]+))?\\s*(\\{.*?\\})?([^\\[\\]]*))");
 			Pattern descPattern1 = Pattern.compile("([^\\.]+).*");
 			Pattern descPattern = Pattern.compile("([^\\(]*)(\\(default\\:\\s+([^\\)]+)\\).*)");
 			for (String line : lines) {
 				Matcher optionMatcher = optionPattern.matcher(line);
 				if (optionMatcher.matches() && !optionMatcher.group(2).equals("help")) {
 					if (optionMatcher.group(3) != null) {
 						String defaultValue = argMap.get(optionMatcher.group(2));
 						String description = optionMatcher.group(6);
 						Matcher m = descPattern1.matcher(optionMatcher.group(6));
 						if (m.matches()) {
 							description = m.group(1).trim();
 						}
 						IMesonPropertyPageControl control = new MesonPropertyText(group, optionMatcher.group(2), defaultValue, description);
 						controls.add(control);
 					} else if (optionMatcher.group(5) != null) {
 						String defaultValue = argMap.get(optionMatcher.group(2));
 						Matcher m = descPattern.matcher(optionMatcher.group(6));
 						if (m.matches()) {
 							String valueString = optionMatcher.group(5).replaceAll("\\{", ""); //$NON-NLS-1$ //$NON-NLS-2$
 							valueString = valueString.replaceAll("\\}", ""); //$NON-NLS-1$ //$NON-NLS-2$
 							String[] values = valueString.split(","); //$NON-NLS-1$
 							if (defaultValue == null) {
 								defaultValue = m.group(3).trim();
 							}
 							IMesonPropertyPageControl control = new MesonPropertyCombo(group, optionMatcher.group(2), values, defaultValue, m.group(1).trim());
 							controls.add(control);
 						}
 					} else {
 						boolean defaultValue = false;
 						if (argMap.containsKey(optionMatcher.group(2))) {
 							defaultValue = Boolean.parseBoolean(argMap.get(optionMatcher.group(2)));
 						}
 						IMesonPropertyPageControl control = new MesonPropertySpecialCheckbox(group, optionMatcher.group(2), defaultValue, optionMatcher.group(6));
 						controls.add(control);
 					}
 				}

 			}
 		} catch (UnsupportedEncodingException e) {
 			return controls;
 		}
 		return controls;
 	}

 	/**
 	 * Parse output of meson configure call to determine options to show to user
 	 * @param stdout - ByteArrayOutputStream containing output of command
 	 * @param composite - Composite to add Controls to
 	 * @return - list of Controls
 	 */
 	List<IMesonPropertyPageControl> parseConfigureOutput(ByteArrayOutputStream stdout, Composite composite) {
 		List<IMesonPropertyPageControl> controls = new ArrayList<>();

 		try {
 			String[] lines = stdout.toString(StandardCharsets.UTF_8.name()).split("\\r?\\n"); //$NON-NLS-1$
 			ParseState state = ParseState.INIT;
 			Pattern optionPattern = Pattern.compile(Messages.MesonPropertyPage_option_pattern);
 			Pattern optionWithValuesPattern = Pattern.compile(Messages.MesonPropertyPage_option_with_values_pattern);
 			Pattern optionLine = Pattern.compile("(\\w+)\\s+([\\w,\\-,/]+)\\s+(.*)$"); //$NON-NLS-1$
 			Pattern optionWithValuesLine = Pattern.compile("(\\w+)\\s+([\\w,\\-,/]+)\\s+\\[([\\w,\\-,/]+)((,\\s+[\\w,\\-]+)*)\\]\\s+(.*)$");
 			Pattern compilerOrLinkerArgs = Pattern.compile(Messages.MesonPropertyPage_compiler_or_link_args);
 			Pattern argLine = Pattern.compile("(\\w+)\\s+\\[([^\\]]*)\\]"); //$NON-NLS-1$
 			Pattern groupPattern = Pattern.compile("(([^:]*)):"); //$NON-NLS-1$
 			String groupName = ""; //$NON-NLS-1$
 			Composite parent = composite;
 			for (String line : lines) {
 				line = line.trim();
 				boolean unprocessed = true;
 				while (unprocessed) {
 					unprocessed = false;
 					switch (state) {
 					case INIT:
 						Matcher argMatcher = compilerOrLinkerArgs.matcher(line);
 						if (argMatcher.matches()) {
 							state = ParseState.ARGS;
 							Group group = new Group(composite, SWT.BORDER);
 							group.setLayout(new GridLayout(2, true));
 							group.setLayoutData(new GridData(GridData.FILL_BOTH));
 							group.setText(argMatcher.group(1));
 							parent = group;
 						} else {
 							Matcher groupMatcher = groupPattern.matcher(line);
 							if (groupMatcher.matches()) {
 								groupName = groupMatcher.group(1);
 								state = ParseState.GROUP;
 							}
 							parent = composite;
 						}
 						break;
 					case GROUP:
 						Matcher m = optionPattern.matcher(line);
 						if (m.matches()) {
 							state = ParseState.OPTION;
 							if (parent == composite) {
 								Group group = new Group(composite, SWT.BORDER);
 								group.setLayout(new GridLayout(2, true));
 								group.setLayoutData(new GridData(GridData.FILL_BOTH));
 								group.setText(groupName);
 								parent = group;
 							}
 							break;
 						}
 						m = optionWithValuesPattern.matcher(line);
 						if (m.matches()) {
 							state = ParseState.OPTION_WITH_VALUES;
 							if (parent == composite) {
 								Group group = new Group(composite, SWT.BORDER);
 								group.setLayout(new GridLayout(2, true));
 								group.setLayoutData(new GridData(GridData.FILL_BOTH));
 								group.setText(groupName);
 								parent = group;
 							}
 							break;
 						}

 						if (line.contains(":")) { //$NON-NLS-1$
 							state = ParseState.INIT;
 							unprocessed = true;
 							parent = composite;
 						}
 						break;
 					case ARGS:
 						Matcher m2 = argLine.matcher(line);
 						if (m2.matches()) {
 							String argName = m2.group(1);
 							String argValue = m2.group(2);
 							argValue = argValue.replaceAll("',", ""); //$NON-NLS-1$ //$NON-NLS-2$
 							argValue = argValue.replaceAll("'", ""); //$NON-NLS-1$ //$NON-NLS-2$
 							String argDescription = Messages.MesonPropertyPage_arg_description;
 							IMesonPropertyPageControl argControl = new MesonPropertyText(parent, argName, argValue, argDescription);
 							controls.add(argControl);
 						}
 						state = ParseState.INIT;
 						parent = composite;
 						break;
 					case OPTION:
 						Matcher m3 = optionLine.matcher(line);
 						if (line.startsWith("----")) { //$NON-NLS-1$
 							break;
 						}
 						if (line.isEmpty()) {
 							state = ParseState.INIT;
 							parent = composite;
 							break;
 						}
 						if (m3.matches()) {
 							String name = m3.group(1);
 							String value = m3.group(2);
 							String description = m3.group(3);
 							boolean isInteger = false;
 							try {
 								Integer.parseInt(value);
 								isInteger = true;
 							} catch (NumberFormatException e) {
 								// do nothing
 							}
 							if (isInteger) {
 								IMesonPropertyPageControl control = new MesonPropertyInteger(parent, this, name, value, description);
 								controls.add(control);
 							} else if (Messages.MesonPropertyPage_true.equals(value) ||
 									Messages.MesonPropertyPage_false.equals(value)) {
 								IMesonPropertyPageControl control = new MesonPropertyCheckbox(parent, name, Boolean.getBoolean(value), description);
 								controls.add(control);
 							} else {
 								IMesonPropertyPageControl control = new MesonPropertyText(parent, name, value, description);
 								controls.add(control);
 							}
 						} else {
 							if (line.contains(":")) { //$NON-NLS-1$
 								state = ParseState.INIT;
 								parent = composite;
 								unprocessed = true;
 							} else {
 								state = ParseState.GROUP;
 								unprocessed = true;
 							}
 						}
 						break;
 					case OPTION_WITH_VALUES:
 						Matcher m4 = optionWithValuesLine.matcher(line);
 						if (line.startsWith("----")) { //$NON-NLS-1$
 							break;
 						}
 						if (line.isEmpty()) {
 							state = ParseState.INIT;
 							parent = composite;
 							break;
 						}
 						if (m4.matches()) {
 							String name = m4.group(1);
 							String value = m4.group(2);
 							String possibleValue = m4.group(3);
 							String extraValues = m4.group(4);
 							String description = m4.group(6);
 							String[] values = new String[] {possibleValue};
 							if (!extraValues.isEmpty()) {
 								values = extraValues.split(",\\s+");
 								values[0] = possibleValue;
 							}
 							IMesonPropertyPageControl control = new MesonPropertyCombo(parent, name, values, value, description);
 							controls.add(control);
 						} else {
 							if (line.contains(":")) { //$NON-NLS-1$
 								state = ParseState.INIT;
 								parent = composite;
 								unprocessed = true;
 							} else {
 								state = ParseState.GROUP;
 								unprocessed = true;
 							}
 						}
 						break;
 					}
 				}
 			}
 		} catch (UnsupportedEncodingException e) {
 			return controls;
 		}
 		return controls;
 	}

 }
	/*******************************************************************************
	* Copyright (c) 2016,2018 IAR Systems AB
	* All rights reserved. This program and the accompanying materials
	* are made available under the terms of the Eclipse Public License v1.0
	* which accompanies this distribution, and is available at
	* http://www.eclipse.org/legal/epl-v10.html
	*
	* Contributors:
	* IAR Systems - initial API and implementation
	* Red Hat Inc. - modified for use in Meson build
	*******************************************************************************/
	package org.eclipse.cdt.meson.ui.properties;

	import java.io.ByteArrayOutputStream;
	import java.io.IOException;
	import java.io.OutputStream;
	import java.io.UnsupportedEncodingException;
	import java.nio.charset.StandardCharsets;
	import java.util.ArrayList;
	import java.util.HashMap;
	import java.util.List;
	import java.util.Map;
	import java.util.regex.Matcher;
	import java.util.regex.Pattern;

	import org.eclipse.cdt.core.CCorePlugin;
	import org.eclipse.cdt.core.CommandLauncherManager;
	import org.eclipse.cdt.core.ICommandLauncher;
	import org.eclipse.cdt.core.build.CBuildConfiguration;
	import org.eclipse.cdt.core.build.ICBuildCommandLauncher;
	import org.eclipse.cdt.core.build.ICBuildConfiguration;
	import org.eclipse.cdt.core.resources.IConsole;
	import org.eclipse.cdt.meson.core.IMesonConstants;
	import org.eclipse.cdt.meson.ui.Activator;
	import org.eclipse.core.resources.IProject;
	import org.eclipse.core.runtime.CoreException;
	import org.eclipse.core.runtime.IPath;
	import org.eclipse.core.runtime.NullProgressMonitor;
	import org.eclipse.core.runtime.Path;
	import org.eclipse.jface.dialogs.MessageDialog;
	import org.eclipse.osgi.util.NLS;
	import org.eclipse.swt.SWT;
	import org.eclipse.swt.layout.GridData;
	import org.eclipse.swt.layout.GridLayout;
	import org.eclipse.swt.widgets.Composite;
	import org.eclipse.swt.widgets.Control;
	import org.eclipse.swt.widgets.Display;
	import org.eclipse.swt.widgets.Group;
	import org.eclipse.swt.widgets.Label;
	import org.eclipse.swt.widgets.Text;
	import org.eclipse.ui.dialogs.PropertyPage;

	/**
	* Property page for Meson projects. For unconfigured projects, we use the meson command and parse
	* the output of the --help option. Otherwise, we use the meson configure command to find current
	* options and what may be changed via a meson configure call.
	*
	* We assume that the build directory is in project/build/configname, which is where
	* the CMake project wizard puts it. We also assume that "cmake-gui" is in the user's
	* PATH.
	*/
	public class MesonPropertyPage extends PropertyPage {

	private IProject project;
	private List<IMesonPropertyPageControl> componentList = new ArrayList<>();
	private boolean configured;
	private CBuildConfiguration buildConfig;
	private Text envText;
	private Text projText;

	@Override
	protected Control createContents(Composite parent) {
	Composite composite = new Composite(parent, SWT.NONE);
	composite.setLayoutData(new GridData(GridData.FILL_BOTH));
	composite.setLayout(new GridLayout(1, true));

	project = (IProject) getElement();
	String configName;
	try {
	buildConfig = ((CBuildConfiguration)project.getActiveBuildConfig().getAdapter(ICBuildConfiguration.class));
	configName = ((CBuildConfiguration)project.getActiveBuildConfig().getAdapter(ICBuildConfiguration.class)).getName();
	IPath sourceDir = project.getLocation();
	String buildDir = project.getLocation().append("build").append(configName).toOSString(); //$NON-NLS-1$
	IPath buildPath = new Path(buildDir).append("build.ninja"); //$NON-NLS-1$
	configured = buildPath.toFile().exists();
	if (configured) {

	ICommandLauncher launcher = CommandLauncherManager.getInstance().getCommandLauncher(project.getActiveBuildConfig().getAdapter(ICBuildConfiguration.class));
	launcher.setProject(project);
	if (launcher instanceof ICBuildCommandLauncher) {
	((ICBuildCommandLauncher)launcher).setBuildConfiguration(buildConfig);
	}
	Process p = launcher.execute(new Path("meson"), new String[] { "configure", buildDir}, //$NON-NLS-1$ //$NON-NLS-2$
	new String[0], sourceDir, new NullProgressMonitor());
	if (p != null) {
	ByteArrayOutputStream stdout = new ByteArrayOutputStream();
	ByteArrayOutputStream stderr = new ByteArrayOutputStream();
	int rc = -1;
	try {
	if (launcher.waitAndRead(stdout, stderr, new NullProgressMonitor()) == ICommandLauncher.OK) {
	p.waitFor();
	}
	rc = p.exitValue();
	} catch (InterruptedException e) {
	// ignore for now
	}
	if (rc == 0) {
	componentList = parseConfigureOutput(stdout, composite);
	}
	}
	} else {
	ICommandLauncher launcher = CommandLauncherManager.getInstance().getCommandLauncher(project.getActiveBuildConfig().getAdapter(ICBuildConfiguration.class));
	launcher.setProject(project);
	if (launcher instanceof ICBuildCommandLauncher) {
	((ICBuildCommandLauncher)launcher).setBuildConfiguration(buildConfig);
	}
	Process p = launcher.execute(new Path("meson"), new String[] { "-h"}, //$NON-NLS-1$ //$NON-NLS-2$
	new String[0], sourceDir, new NullProgressMonitor());
	if (p == null) {
	return null;
	}
	ByteArrayOutputStream stdout = new ByteArrayOutputStream();
	ByteArrayOutputStream stderr = new ByteArrayOutputStream();
	int rc = -1;
	try {
	if (launcher.waitAndRead(stdout, stderr, new NullProgressMonitor()) == ICommandLauncher.OK) {
	p.waitFor();
	}
	rc = p.exitValue();
	} catch (InterruptedException e) {
	// ignore for now
	}
	if (rc == 0) {
	Map<String, String> argMap = new HashMap<>();
	String mesonArgs = buildConfig.getProperty(IMesonConstants.MESON_ARGUMENTS);
	if (mesonArgs != null) {
	String[] argStrings = mesonArgs.split("--"); //$NON-NLS-1$
	for (String argString : argStrings) {
	if (!argString.isEmpty()) {
	String[] s = argString.split("="); //$NON-NLS-1$
	if (s.length == 2) {
	argMap.put(s[0], s[1].trim());
	} else {
	argMap.put(argString.trim(), "true"); //$NON-NLS-1$
	}
	}
	}
	}

	Group group = new Group(composite, SWT.BORDER);
	GridLayout layout = new GridLayout(2, true);
	layout.marginLeft = 10;
	layout.marginRight = 10;
	group.setLayout(layout);
	group.setLayoutData(new GridData(GridData.FILL_BOTH));
	group.setText(Messages.MesonPropertyPage_env_group);

	Label envLabel = new Label(group, SWT.NONE);
	envLabel.setText(Messages.MesonPropertyPage_env_label);
	GridData data = new GridData(GridData.FILL, GridData.FILL, true, false);
	data.grabExcessHorizontalSpace = true;
	data.horizontalSpan = 1;
	envLabel.setLayoutData(data);


	String mesonEnv = buildConfig.getProperty(IMesonConstants.MESON_ENV);

	envText = new Text(group, SWT.BORDER);
	if (mesonEnv != null) {
	envText.setText(mesonEnv);
	}
	envText.setToolTipText(Messages.MesonPropertyPage_env_tooltip);
	data = new GridData(GridData.FILL, GridData.FILL, true, false);
	data.grabExcessHorizontalSpace = true;
	data.horizontalSpan = 1;
	envText.setLayoutData(data);

	group = new Group(composite, SWT.BORDER);
	layout = new GridLayout(2, true);
	layout.marginLeft = 10;
	layout.marginRight = 10;
	group.setLayout(layout);
	group.setLayoutData(new GridData(GridData.FILL_BOTH));
	group.setText(Messages.MesonPropertyPage_project_group);

	Label projLabel = new Label(group, SWT.NONE);
	projLabel.setText(Messages.MesonPropertyPage_project_label);
	data = new GridData(GridData.FILL, GridData.FILL, true, false);
	data.grabExcessHorizontalSpace = true;
	data.horizontalSpan = 1;
	projLabel.setLayoutData(data);

	String mesonProjOptions = buildConfig.getProperty(IMesonConstants.MESON_PROJECT_OPTIONS);

	projText = new Text(group, SWT.BORDER);
	if (mesonProjOptions != null) {
	projText.setText(mesonProjOptions);
	}
	projText.setToolTipText(Messages.MesonPropertyPage_project_tooltip);
	data = new GridData(GridData.FILL, GridData.FILL, true, false);
	data.grabExcessHorizontalSpace = true;
	data.horizontalSpan = 1;
	projText.setLayoutData(data);

	// default buildtype based on active build configuration
	// user can always override and we will use override from then on
	String defaultBuildType = "release"; //$NON-NLS-1$
	if (configName.contains("debug")) { //$NON-NLS-1$
	defaultBuildType = "debug"; //$NON-NLS-1$
	}
	if (argMap.get("buildtype") == null) { //$NON-NLS-1$
	argMap.put("buildtype", defaultBuildType); //$NON-NLS-1$
	}
	componentList = parseHelpOutput(stdout, composite, argMap, defaultBuildType);
	}
	}
	} catch (CoreException e2) {
	// TODO Auto-generated catch block
	e2.printStackTrace();
	}

	return composite;
	}

	public void update() {
	setErrorMessage(null);
	for (IMesonPropertyPageControl control : componentList) {
	if (!control.isValid()) {
	setValid(false);
	setErrorMessage(control.getErrorMessage());
	}
	}
	}

	public enum ParseState {
	INIT, GROUP, OPTION, OPTION_WITH_VALUES, ARGS
	};

	@Override
	public boolean performOk() {
	List<String> args = new ArrayList<>();
	if (configured) {
	args.add("configure"); //$NON-NLS-1$
	for (IMesonPropertyPageControl control : componentList) {
	if (control.isValueChanged()) {
	args.add(control.getConfiguredString()); //$NON-NLS-1$ //$NON-NLS-2$
	}
	}
	if (args.size() == 2) {
	return true;
	}
	try {
	String configName = ((CBuildConfiguration)project.getActiveBuildConfig().getAdapter(ICBuildConfiguration.class)).getName();
	IPath sourceDir = project.getLocation();
	String buildDir = project.getLocation().append("build").append(configName).toOSString(); //$NON-NLS-1$
	ICommandLauncher launcher = CommandLauncherManager.getInstance().getCommandLauncher(project.getActiveBuildConfig().getAdapter(ICBuildConfiguration.class));
	launcher.setProject(project);
	if (launcher instanceof ICBuildCommandLauncher) {
	((ICBuildCommandLauncher)launcher).setBuildConfiguration(buildConfig);
	}
	args.add(buildDir);
	Process p = launcher.execute(new Path("meson"), args.toArray(new String[0]), new String[0], sourceDir, new NullProgressMonitor()); //$NON-NLS-1$ //$NON-NLS-2$
	int rc = -1;
	IConsole console = CCorePlugin.getDefault().getConsole();
	console.start(project);
	try (OutputStream stdout = console.getOutputStream()) {
	OutputStream stderr = stdout;
	StringBuilder buf = new StringBuilder();
	for (String arg : args) {
	buf.append(arg);
	buf.append(" "); //$NON-NLS-1$
	}
	buf.append(System.lineSeparator());
	stdout.write(buf.toString().getBytes());
	stdout.flush();
	try {

	if (launcher.waitAndRead(stdout, stderr, new NullProgressMonitor()) == ICommandLauncher.OK) {
	p.waitFor();
	}
	rc = p.exitValue();
	stdout.write(NLS.bind(Messages.MesonPropertyPage_terminated_rc, rc).getBytes());
	stdout.flush();
	if (rc != 0) {
	Display.getDefault().syncExec(() -> {
	MessageDialog.openError(getShell(), null, Messages.MesonPropertyPage_configure_failed);
	});
	}
	} catch (InterruptedException e) {
	// ignore for now
	}
	} catch (IOException e2) {
	Activator.log(e2);
	return false;
	}
	} catch (CoreException e3) {
	// TODO Auto-generated catch block
	Activator.log(e3);
	return false;
	}
	} else {
	StringBuilder mesonargs = new StringBuilder();
	for (IMesonPropertyPageControl control : componentList) {
	if (!control.getUnconfiguredString().isEmpty()) {
	mesonargs.append(control.getUnconfiguredString());
	mesonargs.append(" "); //$NON-NLS-1$
	}
	}
	buildConfig.setProperty(IMesonConstants.MESON_ARGUMENTS, mesonargs.toString());
	buildConfig.setProperty(IMesonConstants.MESON_ENV, envText.getText().trim());
	buildConfig.setProperty(IMesonConstants.MESON_PROJECT_OPTIONS, projText.getText().trim());
	}
	return true;
	}
	/**
	* Parse output of meson help call to determine options to show to user
	* @param stdout - ByteArrayOutputStream containing output of command
	* @param composite - Composite to add Controls to
	* @return - list of Controls
	*/
	List<IMesonPropertyPageControl> parseHelpOutput(ByteArrayOutputStream stdout, Composite composite, Map<String, String> argMap, String defaultBuildType) {
	List<IMesonPropertyPageControl> controls = new ArrayList<>();

	Group group = new Group(composite, SWT.BORDER);
	GridLayout layout = new GridLayout(2, true);
	layout.marginLeft = 10;
	layout.marginRight = 10;
	group.setLayout(layout);
	group.setLayoutData(new GridData(GridData.FILL_BOTH));
	group.setText(Messages.MesonPropertyPage_options_group);

	try {
	String output = stdout.toString(StandardCharsets.UTF_8.name()).replaceAll("\\r?\\n\\s+", " "); //$NON-NLS-1$ //$NON-NLS-2$
	String[] lines = output.split("--"); //$NON-NLS-1$
	Pattern optionPattern = Pattern.compile("(([a-z-]+)\\s+(([A-Z_][A-Z_]+))?\\s(\\{.?\\})?([^\\[\\]]*))");
	Pattern descPattern1 = Pattern.compile("([^\\.]+).*");
	Pattern descPattern = Pattern.compile("([^\\(])(\\(default\\:\\s+([^\\)]+)\\).)");
	for (String line : lines) {
	Matcher optionMatcher = optionPattern.matcher(line);
	if (optionMatcher.matches() && !optionMatcher.group(2).equals("help")) {
	if (optionMatcher.group(3) != null) {
	String defaultValue = argMap.get(optionMatcher.group(2));
	String description = optionMatcher.group(6);
	Matcher m = descPattern1.matcher(optionMatcher.group(6));
	if (m.matches()) {
	description = m.group(1).trim();
	}
	IMesonPropertyPageControl control = new MesonPropertyText(group, optionMatcher.group(2), defaultValue, description);
	controls.add(control);
	} else if (optionMatcher.group(5) != null) {
	String defaultValue = argMap.get(optionMatcher.group(2));
	Matcher m = descPattern.matcher(optionMatcher.group(6));
	if (m.matches()) {
	String valueString = optionMatcher.group(5).replaceAll("\\{", ""); //$NON-NLS-1$ //$NON-NLS-2$
	valueString = valueString.replaceAll("\\}", ""); //$NON-NLS-1$ //$NON-NLS-2$
	String[] values = valueString.split(","); //$NON-NLS-1$
	if (defaultValue == null) {
	defaultValue = m.group(3).trim();
	}
	IMesonPropertyPageControl control = new MesonPropertyCombo(group, optionMatcher.group(2), values, defaultValue, m.group(1).trim());
	controls.add(control);
	}
	} else {
	boolean defaultValue = false;
	if (argMap.containsKey(optionMatcher.group(2))) {
	defaultValue = Boolean.parseBoolean(argMap.get(optionMatcher.group(2)));
	}
	IMesonPropertyPageControl control = new MesonPropertySpecialCheckbox(group, optionMatcher.group(2), defaultValue, optionMatcher.group(6));
	controls.add(control);
	}
	}

	}
	} catch (UnsupportedEncodingException e) {
	return controls;
	}
	return controls;
	}

	/**
	* Parse output of meson configure call to determine options to show to user
	* @param stdout - ByteArrayOutputStream containing output of command
	* @param composite - Composite to add Controls to
	* @return - list of Controls
	*/
	List<IMesonPropertyPageControl> parseConfigureOutput(ByteArrayOutputStream stdout, Composite composite) {
	List<IMesonPropertyPageControl> controls = new ArrayList<>();

	try {
	String[] lines = stdout.toString(StandardCharsets.UTF_8.name()).split("\\r?\\n"); //$NON-NLS-1$
	ParseState state = ParseState.INIT;
	Pattern optionPattern = Pattern.compile(Messages.MesonPropertyPage_option_pattern);
	Pattern optionWithValuesPattern = Pattern.compile(Messages.MesonPropertyPage_option_with_values_pattern);
	Pattern optionLine = Pattern.compile("(\\w+)\\s+([\\w,\\-,/]+)\\s+(.*)$"); //$NON-NLS-1$
	Pattern optionWithValuesLine = Pattern.compile("(\\w+)\\s+([\\w,\\-,/]+)\\s+\\[([\\w,\\-,/]+)((,\\s+[\\w,\\-]+))\\]\\s+(.)$");
	Pattern compilerOrLinkerArgs = Pattern.compile(Messages.MesonPropertyPage_compiler_or_link_args);
	Pattern argLine = Pattern.compile("(\\w+)\\s+\\[([^\\]]*)\\]"); //$NON-NLS-1$
	Pattern groupPattern = Pattern.compile("(([^:]*)):"); //$NON-NLS-1$
	String groupName = ""; //$NON-NLS-1$
	Composite parent = composite;
	for (String line : lines) {
	line = line.trim();
	boolean unprocessed = true;
	while (unprocessed) {
	unprocessed = false;
	switch (state) {
	case INIT:
	Matcher argMatcher = compilerOrLinkerArgs.matcher(line);
	if (argMatcher.matches()) {
	state = ParseState.ARGS;
	Group group = new Group(composite, SWT.BORDER);
	group.setLayout(new GridLayout(2, true));
	group.setLayoutData(new GridData(GridData.FILL_BOTH));
	group.setText(argMatcher.group(1));
	parent = group;
	} else {
	Matcher groupMatcher = groupPattern.matcher(line);
	if (groupMatcher.matches()) {
	groupName = groupMatcher.group(1);
	state = ParseState.GROUP;
	}
	parent = composite;
	}
	break;
	case GROUP:
	Matcher m = optionPattern.matcher(line);
	if (m.matches()) {
	state = ParseState.OPTION;
	if (parent == composite) {
	Group group = new Group(composite, SWT.BORDER);
	group.setLayout(new GridLayout(2, true));
	group.setLayoutData(new GridData(GridData.FILL_BOTH));
	group.setText(groupName);
	parent = group;
	}
	break;
	}
	m = optionWithValuesPattern.matcher(line);
	if (m.matches()) {
	state = ParseState.OPTION_WITH_VALUES;
	if (parent == composite) {
	Group group = new Group(composite, SWT.BORDER);
	group.setLayout(new GridLayout(2, true));
	group.setLayoutData(new GridData(GridData.FILL_BOTH));
	group.setText(groupName);
	parent = group;
	}
	break;
	}

	if (line.contains(":")) { //$NON-NLS-1$
	state = ParseState.INIT;
	unprocessed = true;
	parent = composite;
	}
	break;
	case ARGS:
	Matcher m2 = argLine.matcher(line);
	if (m2.matches()) {
	String argName = m2.group(1);
	String argValue = m2.group(2);
	argValue = argValue.replaceAll("',", ""); //$NON-NLS-1$ //$NON-NLS-2$
	argValue = argValue.replaceAll("'", ""); //$NON-NLS-1$ //$NON-NLS-2$
	String argDescription = Messages.MesonPropertyPage_arg_description;
	IMesonPropertyPageControl argControl = new MesonPropertyText(parent, argName, argValue, argDescription);
	controls.add(argControl);
	}
	state = ParseState.INIT;
	parent = composite;
	break;
	case OPTION:
	Matcher m3 = optionLine.matcher(line);
	if (line.startsWith("----")) { //$NON-NLS-1$
	break;
	}
	if (line.isEmpty()) {
	state = ParseState.INIT;
	parent = composite;
	break;
	}
	if (m3.matches()) {
	String name = m3.group(1);
	String value = m3.group(2);
	String description = m3.group(3);
	boolean isInteger = false;
	try {
	Integer.parseInt(value);
	isInteger = true;
	} catch (NumberFormatException e) {
	// do nothing
	}
	if (isInteger) {
	IMesonPropertyPageControl control = new MesonPropertyInteger(parent, this, name, value, description);
	controls.add(control);
	} else if (Messages.MesonPropertyPage_true.equals(value) \|\|
	Messages.MesonPropertyPage_false.equals(value)) {
	IMesonPropertyPageControl control = new MesonPropertyCheckbox(parent, name, Boolean.getBoolean(value), description);
	controls.add(control);
	} else {
	IMesonPropertyPageControl control = new MesonPropertyText(parent, name, value, description);
	controls.add(control);
	}
	} else {
	if (line.contains(":")) { //$NON-NLS-1$
	state = ParseState.INIT;
	parent = composite;
	unprocessed = true;
	} else {
	state = ParseState.GROUP;
	unprocessed = true;
	}
	}
	break;
	case OPTION_WITH_VALUES:
	Matcher m4 = optionWithValuesLine.matcher(line);
	if (line.startsWith("----")) { //$NON-NLS-1$
	break;
	}
	if (line.isEmpty()) {
	state = ParseState.INIT;
	parent = composite;
	break;
	}
	if (m4.matches()) {
	String name = m4.group(1);
	String value = m4.group(2);
	String possibleValue = m4.group(3);
	String extraValues = m4.group(4);
	String description = m4.group(6);
	String[] values = new String[] {possibleValue};
	if (!extraValues.isEmpty()) {
	values = extraValues.split(",\\s+");
	values[0] = possibleValue;
	}
	IMesonPropertyPageControl control = new MesonPropertyCombo(parent, name, values, value, description);
	controls.add(control);
	} else {
	if (line.contains(":")) { //$NON-NLS-1$
	state = ParseState.INIT;
	parent = composite;
	unprocessed = true;
	} else {
	state = ParseState.GROUP;
	unprocessed = true;
	}
	}
	break;
	}
	}
	}
	} catch (UnsupportedEncodingException e) {
	return controls;
	}
	return controls;
	}

	}