[#227] Refactor ClangdConfigurationManager

- Support cmake projects as well

fixes #227

Author: ghentschke

bundles/org.eclipse.cdt.lsp.clangd/META-INF/MANIFEST.MF

@@ -30,7 +30,8 @@ Require-Bundle: org.eclipse.cdt.lsp;bundle-version="0.0.0",
  org.eclipse.ui.ide;bundle-version="0.0.0",
  org.eclipse.ui.workbench;bundle-version="0.0.0",
  org.eclipse.ui.workbench.texteditor;bundle-version="0.0.0",
- org.eclipse.core.variables
+ org.eclipse.core.variables,
+ org.eclipse.cdt.cmake.core
 Service-Component: OSGI-INF/org.eclipse.cdt.lsp.clangd.BuiltinClangdOptionsDefaults.xml,
  OSGI-INF/org.eclipse.cdt.lsp.clangd.ClangdConfigurationFileManager.xml,
  OSGI-INF/org.eclipse.cdt.lsp.clangd.DefaultCProjectChangeMonitor.xml,

bundles/org.eclipse.cdt.lsp.clangd/OSGI-INF/org.eclipse.cdt.lsp.clangd.ClangdConfigurationFileManager.xml

@@ -1,8 +1,9 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<scr:component xmlns:scr="http://www.osgi.org/xmlns/scr/v1.1.0" name="org.eclipse.cdt.lsp.clangd.ClangdConfigurationFileManager">
+<scr:component xmlns:scr="http://www.osgi.org/xmlns/scr/v1.3.0" name="org.eclipse.cdt.lsp.clangd.ClangdConfigurationFileManager">
    <property name="service.ranking" type="Integer" value="0"/>
    <service>
       <provide interface="org.eclipse.cdt.lsp.clangd.ClangdCProjectDescriptionListener"/>
    </service>
+   <reference cardinality="1..1" field="build" interface="org.eclipse.cdt.core.build.ICBuildConfigurationManager" name="build"/>
    <implementation class="org.eclipse.cdt.lsp.clangd.ClangdConfigurationFileManager"/>
 </scr:component>

bundles/org.eclipse.cdt.lsp.clangd/src/org/eclipse/cdt/lsp/clangd/ClangdConfigurationFileManager.java

@@ -19,6 +19,9 @@
 import java.util.Map;
 import java.util.Optional;
 
+import org.eclipse.cdt.core.build.CBuildConfiguration;
+import org.eclipse.cdt.core.build.ICBuildConfiguration;
+import org.eclipse.cdt.core.build.ICBuildConfigurationManager;
 import org.eclipse.cdt.core.cdtvariables.CdtVariableException;
 import org.eclipse.cdt.core.settings.model.CProjectDescriptionEvent;
 import org.eclipse.cdt.core.settings.model.ICConfigurationDescription;
@@ -36,6 +39,7 @@
 import org.eclipse.core.runtime.Platform;
 import org.eclipse.core.runtime.Status;
 import org.osgi.service.component.annotations.Component;
+import org.osgi.service.component.annotations.Reference;
 import org.yaml.snakeyaml.Yaml;
 import org.yaml.snakeyaml.scanner.ScannerException;
 
@@ -56,6 +60,9 @@ public class ClangdConfigurationFileManager implements ClangdCProjectDescription
 	private static final String SET_COMPILATION_DB = COMPILE_FLAGS + ": {" + COMPILATTION_DATABASE + ": %s}"; //$NON-NLS-1$ //$NON-NLS-2$
 	private static final String EMPTY = ""; //$NON-NLS-1$
 
+	@Reference
+	private ICBuildConfigurationManager build;
+
 	@Override
 	public void handleEvent(CProjectDescriptionEvent event, MacroResolver macroResolver) {
 		setCompilationDatabasePath(event.getProject(), event.getNewCProjectDescription(), macroResolver);
@@ -105,19 +112,45 @@ private String getRelativeDatabasePath(IProject project, ICProjectDescription ne
 		if (project != null && newCProjectDescription != null) {
 			ICConfigurationDescription config = newCProjectDescription.getDefaultSettingConfiguration();
 			var cwdBuilder = config.getBuildSetting().getBuilderCWD();
+			var projectLocation = project.getLocation().addTrailingSeparator().toOSString();
 			if (cwdBuilder != null) {
-				var projectLocation = project.getLocation().addTrailingSeparator().toOSString();
 				try {
 					var cwdString = macroResolver.resolveValue(cwdBuilder.toOSString(), EMPTY, null, config);
 					return cwdString.replace(projectLocation, EMPTY);
 				} catch (CdtVariableException e) {
 					Platform.getLog(getClass()).log(e.getStatus());
 				}
+			} else {
+				//it is probably a cmake project:
+				return buildConfiguration(project)//
+						.filter(CBuildConfiguration.class::isInstance)//
+						.map(bc -> {
+							try {
+								return ((CBuildConfiguration) bc).getBuildContainer();
+							} catch (CoreException e) {
+								Platform.getLog(getClass()).log(e.getStatus());
+							}
+							return null;
+						})//
+						.map(c -> c.getLocation())//
+						.map(l -> l.toOSString().replace(projectLocation, EMPTY)).orElse(EMPTY);
 			}
 		}
 		return EMPTY;
 	}
 
+	private Optional<ICBuildConfiguration> buildConfiguration(IResource initial) {
+		try {
+			var active = initial.getProject().getActiveBuildConfig();
+			if (active != null && build != null) {
+				return Optional.ofNullable(build.getBuildConfiguration(active));
+			}
+		} catch (CoreException e) {
+			Platform.getLog(getClass()).error(e.getMessage(), e);
+		}
+		return Optional.empty();
+	}
+
 	/**
 	 * Set the <code>CompilationDatabase</code> entry in the .clangd file in the given project root.
 	 * The file will be created, if it's not existing.