Hannah-Sten · PHPirates · Sep 19, 2024 · Sep 15, 2024 · Sep 18, 2024 · Sep 18, 2024
@@ -18,6 +18,12 @@
             <category>LaTeX</category>
         </intentionAction>
 
+        <intentionAction>
+            <language>Latex</language>
+            <className>nl.hannahsten.texifyidea.intentions.LatexFlipArgumentsIntention</className>
+            <category>LaTeX</category>
+        </intentionAction>
+
         <intentionAction>
             <language>Latex</language>
             <className>nl.hannahsten.texifyidea.intentions.LatexInlineDisplayToggleIntention</className>

@@ -1,3 +1 @@
-\[
-    3 + x = y
-\]
+$ \frac{x}{2} $
@@ -1,3 +1 @@
-\begin{displaymath}
-    3 + x = y
-\end{displaymath}
+$ \frac{2}{x} $
@@ -0,0 +1,3 @@
+\[
+    3 + x = y
+\]
@@ -0,0 +1,3 @@
+\begin{displaymath}
+    3 + x = y
+\end{displaymath}
@@ -0,0 +1,5 @@
+<html>
+<body>
+Swaps the order of passed arguments
+</body>
+</html>
@@ -0,0 +1,63 @@
+package nl.hannahsten.texifyidea.intentions
+
+import com.intellij.openapi.application.runWriteAction
+import com.intellij.openapi.editor.Editor
+import com.intellij.openapi.project.Project
+import com.intellij.openapi.util.TextRange
+import com.intellij.psi.PsiFile
+import com.intellij.refactoring.suggested.endOffset
+import com.intellij.refactoring.suggested.startOffset
+import nl.hannahsten.texifyidea.psi.LatexCommands
+import nl.hannahsten.texifyidea.psi.LatexPsiHelper
+import nl.hannahsten.texifyidea.psi.LatexRequiredParam
+import nl.hannahsten.texifyidea.util.files.getAllRequiredArguments
+import nl.hannahsten.texifyidea.util.files.isLatexFile
+import nl.hannahsten.texifyidea.util.parser.firstChildOfType
+import nl.hannahsten.texifyidea.util.parser.parentOfType
+import nl.hannahsten.texifyidea.util.parser.requiredParameters
+import nl.hannahsten.texifyidea.util.replaceString
+
+class LatexFlipArgumentsIntention : TexifyIntentionBase("Swap the two arguments of a command") {
+    override fun isAvailable(project: Project, editor: Editor?, file: PsiFile?): Boolean {
+        if (editor == null || file == null || !file.isLatexFile()) {
+            return false
+        }
+
+        val parent = getToken(file, editor) ?: return false
+
+        val argCount = parent.getAllRequiredArguments()?.size ?: return false
+
+        return argCount == 2
+    }
+
+    private fun getToken(
+        file: PsiFile,
+        editor: Editor
+    ): LatexCommands? {
+        val selected = file.findElementAt(editor.caretModel.offset) ?: return null
+
+        return selected.parentOfType(LatexCommands::class)
+    }
+
+    override fun invoke(project: Project, editor: Editor?, file: PsiFile?) {
+        if (editor == null || file == null || !file.isLatexFile()) {
+            return
+        }
+
+        val token = getToken(file, editor) ?: return
+        val tokens = token.requiredParameters()
+
+        assert(tokens.size == 2) { "Expected to have only 2 args!" }
+
+        val range = TextRange(tokens[0].startOffset, tokens[1].endOffset)
+
+        val document = editor.document
+        val replacements = tokens[1].text + tokens[0].text
+
+        runWriteAction {
+            token.parent.node.addChild(LatexPsiHelper(project).createFromText(tokens[0].node.text).firstChildOfType(LatexRequiredParam::class)!!.node)
+            tokens[0].delete()
+//            document.replaceString(range, replacements)
+        }
+    }
+}
@@ -0,0 +1,52 @@
+package nl.hannahsten.texifyidea.intentions
+
+import com.intellij.testFramework.fixtures.BasePlatformTestCase
+import nl.hannahsten.texifyidea.file.LatexFileType
+import nl.hannahsten.texifyidea.testutils.writeCommand
+
+class LatexFlipArgumentsIntentionTest : BasePlatformTestCase() {
+
+    fun testInMathEnvironment() {
+        myFixture.configureByText(
+            LatexFileType,
+            """
+            \begin{document}
+                $\frac{a<caret>}{b}$
+            \end{document}
+            """.trimIndent()
+        )
+        val intentions = myFixture.availableIntentions
+        writeCommand(myFixture.project) {
+            intentions.first { i -> i.text == "Swap the two arguments of a command" }.invoke(myFixture.project, myFixture.editor, myFixture.file)
+        }
+        myFixture.checkResult(
+            """
+            \begin{document}
+                $\frac{b<caret>}{a}$
+            \end{document}
+            """.trimIndent()
+        )
+    }
+
+    fun testOnFunctionTOken() {
+        myFixture.configureByText(
+            LatexFileType,
+            """
+            \begin{document}
+                $\fr<caret>ac{a}{b}$
+            \end{document}
+            """.trimIndent()
+        )
+        val intentions = myFixture.availableIntentions
+        writeCommand(myFixture.project) {
+            intentions.first { i -> i.text == "Swap the two arguments of a command" }.invoke(myFixture.project, myFixture.editor, myFixture.file)
+        }
+        myFixture.checkResult(
+            """
+            \begin{document}
+                $\fr<caret>ac{b}{a}$
+            \end{document}
+            """.trimIndent()
+        )
+    }
+}
-Original file line number
+Diff line change
@@ -0,0 +1,3 @@
+    \[
++ x = y
+    \]