fix: Bypass LSP4IJ's formatter validity checks for Zig.

modules/plugin/src/main/resources/META-INF/plugin.xml

@@ -32,6 +32,9 @@
 
         <lang.formatter language="Zig" implementationClass="com.falsepattern.zigbrains.zig.formatter.ZigFormattingModelBuilder"/>
 
+        <formattingService id = "ZigLSPFormattingOnlyServiceProxy" implementation="com.falsepattern.zigbrains.zig.formatter.ZigLSPFormattingOnlyServiceProxy"/>
+        <formattingService id = "ZigLSPFormattingAndRangeBothServiceProxy" implementation="com.falsepattern.zigbrains.zig.formatter.ZigLSPFormattingAndRangeBothServiceProxy"/>
+
         <postStartupActivity implementation="com.falsepattern.zigbrains.zig.lsp.ZLSStartupActivity"/>
 
         <!-- LSP textDocument/signatureHelp -->

modules/zig/src/main/java/com/falsepattern/zigbrains/zig/formatter/ZigAbstractLSPFormattingServiceProxy.java

@@ -0,0 +1,63 @@
+package com.falsepattern.zigbrains.zig.formatter;
+
+import com.falsepattern.zigbrains.zig.ZigLanguage;
+import com.intellij.formatting.FormattingRangesInfo;
+import com.intellij.formatting.service.FormattingService;
+import com.intellij.lang.ImportOptimizer;
+import com.intellij.openapi.project.Project;
+import com.intellij.openapi.util.TextRange;
+import com.intellij.psi.PsiElement;
+import com.intellij.psi.PsiFile;
+import com.redhat.devtools.lsp4ij.LanguageServersRegistry;
+import com.redhat.devtools.lsp4ij.LanguageServiceAccessor;
+import com.redhat.devtools.lsp4ij.features.formatting.AbstractLSPFormattingService;
+import lombok.val;
+import org.eclipse.lsp4j.ServerCapabilities;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.Set;
+
+public abstract class ZigAbstractLSPFormattingServiceProxy implements FormattingService {
+    protected abstract AbstractLSPFormattingService getProxiedService();
+    protected abstract boolean canSupportFormatting(@Nullable ServerCapabilities var1);
+
+    @Override
+    public @NotNull Set<Feature> getFeatures() {
+        return getProxiedService().getFeatures();
+    }
+
+    @Override
+    public boolean canFormat(@NotNull PsiFile file) {
+        val language = file.getLanguage();
+        if (language != ZigLanguage.INSTANCE)
+            return false;
+
+        if (!LanguageServersRegistry.getInstance().isFileSupported(file)) {
+            return false;
+        } else {
+            Project project = file.getProject();
+            return LanguageServiceAccessor.getInstance(project).hasAny(file.getVirtualFile(), (ls) -> this.canSupportFormatting(ls.getServerCapabilitiesSync()));
+        }
+    }
+
+    @Override
+    public @NotNull PsiElement formatElement(@NotNull PsiElement psiElement, boolean b) {
+        return getProxiedService().formatElement(psiElement, b);
+    }
+
+    @Override
+    public @NotNull PsiElement formatElement(@NotNull PsiElement psiElement, @NotNull TextRange textRange, boolean b) {
+        return getProxiedService().formatElement(psiElement, textRange, b);
+    }
+
+    @Override
+    public void formatRanges(@NotNull PsiFile psiFile, FormattingRangesInfo formattingRangesInfo, boolean b, boolean b1) {
+        getProxiedService().formatRanges(psiFile, formattingRangesInfo, b, b1);
+    }
+
+    @Override
+    public @NotNull Set<ImportOptimizer> getImportOptimizers(@NotNull PsiFile psiFile) {
+        return getProxiedService().getImportOptimizers(psiFile);
+    }
+}

modules/zig/src/main/java/com/falsepattern/zigbrains/zig/formatter/ZigLSPFormattingAndRangeBothServiceProxy.java

@@ -0,0 +1,28 @@
+package com.falsepattern.zigbrains.zig.formatter;
+
+import com.intellij.formatting.FormattingRangesInfo;
+import com.intellij.formatting.service.FormattingService;
+import com.intellij.lang.ImportOptimizer;
+import com.intellij.openapi.util.TextRange;
+import com.intellij.psi.PsiElement;
+import com.intellij.psi.PsiFile;
+import com.redhat.devtools.lsp4ij.LanguageServerItem;
+import com.redhat.devtools.lsp4ij.features.formatting.AbstractLSPFormattingService;
+import com.redhat.devtools.lsp4ij.features.formatting.LSPFormattingAndRangeBothService;
+import org.eclipse.lsp4j.ServerCapabilities;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.Set;
+
+public class ZigLSPFormattingAndRangeBothServiceProxy extends ZigAbstractLSPFormattingServiceProxy {
+    @Override
+    protected AbstractLSPFormattingService getProxiedService() {
+        return FormattingService.EP_NAME.findExtension(LSPFormattingAndRangeBothService.class);
+    }
+
+    @Override
+    protected boolean canSupportFormatting(@Nullable ServerCapabilities serverCapabilities) {
+        return LanguageServerItem.isDocumentRangeFormattingSupported(serverCapabilities);
+    }
+}

modules/zig/src/main/java/com/falsepattern/zigbrains/zig/formatter/ZigLSPFormattingOnlyServiceProxy.java

@@ -0,0 +1,21 @@
+package com.falsepattern.zigbrains.zig.formatter;
+
+import com.intellij.formatting.service.FormattingService;
+import com.redhat.devtools.lsp4ij.LanguageServerItem;
+import com.redhat.devtools.lsp4ij.features.formatting.AbstractLSPFormattingService;
+import com.redhat.devtools.lsp4ij.features.formatting.LSPFormattingAndRangeBothService;
+import com.redhat.devtools.lsp4ij.features.formatting.LSPFormattingOnlyService;
+import org.eclipse.lsp4j.ServerCapabilities;
+import org.jetbrains.annotations.Nullable;
+
+public class ZigLSPFormattingOnlyServiceProxy extends ZigAbstractLSPFormattingServiceProxy {
+    @Override
+    protected AbstractLSPFormattingService getProxiedService() {
+        return FormattingService.EP_NAME.findExtension(LSPFormattingOnlyService.class);
+    }
+
+    @Override
+    protected boolean canSupportFormatting(@Nullable ServerCapabilities serverCapabilities) {
+        return LanguageServerItem.isDocumentFormattingSupported(serverCapabilities) && !LanguageServerItem.isDocumentRangeFormattingSupported(serverCapabilities);
+    }
+}

modules/zig/src/main/java/com/falsepattern/zigbrains/zig/settings/ZLSSettingsConfigurable.java

@@ -23,6 +23,8 @@ import com.intellij.openapi.project.Project;
 import lombok.val;
 import org.jetbrains.annotations.NotNull;
 
+import java.lang.invoke.MethodHandles;
+
 public class ZLSSettingsConfigurable implements SubConfigurable {
     private ZLSSettingsPanel appSettingsComponent;