feat: Intention to assign a name to _

core/src/main/kotlin/com/falsepattern/zigbrains/zig/intentions/AssignToUnderscore.kt

@@ -0,0 +1,74 @@
+/*
+ * ZigBrains
+ * Copyright (C) 2023-2025 FalsePattern
+ * All Rights Reserved
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, only version 3 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.falsepattern.zigbrains.zig.intentions
+
+import com.falsepattern.zigbrains.ZigBrainsBundle
+import com.falsepattern.zigbrains.zig.psi.ZigParamDecl
+import com.falsepattern.zigbrains.zig.psi.ZigTypes
+import com.falsepattern.zigbrains.zig.psi.ZigVarDeclProto
+import com.falsepattern.zigbrains.zig.psi.indentSize
+import com.falsepattern.zigbrains.zig.psi.splitString
+import com.intellij.codeInsight.intention.PsiElementBaseIntentionAction
+import com.intellij.openapi.editor.Editor
+import com.intellij.openapi.project.Project
+import com.intellij.psi.PsiElement
+import com.intellij.psi.util.PsiTreeUtil
+import com.intellij.psi.util.PsiUtilCore
+import com.intellij.psi.util.elementType
+import com.intellij.psi.util.endOffset
+import com.intellij.psi.util.parentOfType
+import com.intellij.psi.util.startOffset
+import okhttp3.internal.delimiterOffset
+
+class AssignToUnderscore: PsiElementBaseIntentionAction() {
+    init {
+        text = familyName
+    }
+    override fun getFamilyName() = ZigBrainsBundle.message("intention.family.name.assign-to-underscore")
+
+	// only available in var/param decls
+    override fun isAvailable(project: Project, editor: Editor?, element: PsiElement) =
+        editor != null && (element.parent is ZigVarDeclProto || element.parent is ZigParamDecl) && element.elementType == ZigTypes.IDENTIFIER
+
+    override fun invoke(project: Project, editor: Editor?, element: PsiElement) {
+        editor ?: return
+		val doc = editor.document
+		when ( element.parent ) {
+			is ZigVarDeclProto -> {
+				val end = element.endOffset
+				val name = element.text
+				val seq = doc.immutableCharSequence
+				// get end of current line
+				val nl = end + seq.subSequence( end, seq.length ).indexOfFirst { it == '\n' }
+				// get start of current line
+				val snl = doc.getLineStartOffset( doc.getLineNumber( end ) )  // start new line
+				// refcopy the indentation
+				val indent = seq.subSequence( snl, snl + seq.subSequence( snl, seq.length ).indexOfFirst { !it.isWhitespace() } )
+				// insert the assignment
+				doc.insertString( nl, "\n${indent}_ = $name;" )
+			}
+			is ZigParamDecl -> { // same as above, but we need to guess the indent and might need to expand `{}` into `{\n\i}`
+				error("TODO: NOT IMPLEMENTED YET")
+			}
+		}
+    }
+}

core/src/main/resources/META-INF/zigbrains-core.xml

@@ -47,6 +47,14 @@
             <category>Zig</category>
         </intentionAction>
 
+
+        <!-- QoL things -->
+        <intentionAction>
+            <language>Zig</language>
+            <className>com.falsepattern.zigbrains.zig.intentions.AssignToUnderscore</className>
+            <category>Zig</category>
+        </intentionAction>
+
         <!-- Language injection -->
         <lang.elementManipulator
                 forClass="com.falsepattern.zigbrains.zig.psi.ZigStringLiteral"

core/src/main/resources/intentionDescriptions/AssignToUnderscore/after.zig.template

@@ -0,0 +1,3 @@
+fn foo( bar: Baz ) void {
+	_ = bar;
+}

core/src/main/resources/intentionDescriptions/AssignToUnderscore/before.zig.template

@@ -0,0 +1,2 @@
+fn foo( bar: Baz ) void {
+}

core/src/main/resources/intentionDescriptions/AssignToUnderscore/description.html

@@ -0,0 +1,26 @@
+<!--
+  ~ ZigBrains
+  ~ Copyright (C) 2023-2025 FalsePattern
+  ~ All Rights Reserved
+  ~
+  ~ The above copyright notice and this permission notice shall be included
+  ~ in all copies or substantial portions of the Software.
+  ~
+  ~ This program is free software: you can redistribute it and/or modify
+  ~ it under the terms of the GNU Lesser General Public License as published by
+  ~ the Free Software Foundation, only version 3 of the License.
+  ~
+  ~ This program is distributed in the hope that it will be useful,
+  ~ but WITHOUT ANY WARRANTY; without even the implied warranty of
+  ~ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+  ~ GNU Lesser General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU Lesser General Public License
+  ~ along with this program. If not, see <https://www.gnu.org/licenses/>.
+  -->
+
+<html>
+<body>
+Assigns the name under the cursor to <code>_</code>.
+</body>
+</html>

core/src/main/resources/zigbrains/Bundle.properties

@@ -5,6 +5,7 @@ notification.title.direnv-error=Direnv error
 notification.content.direnv-error=Could not import direnv: {0}
 intention.family.name.make-string-multiline=Convert to multiline
 intention.family.name.make-string-quoted=Convert to quoted
+intention.family.name.assign-to-underscore=Assign to underscore
 zig.file.description=ZigLang file
 configurable.name.zig-color-settings-page=Zig
 zig.color-settings.bad-char=Bad character