ButterKnifeToViewBinding.kt

import com.intellij.openapi.diagnostic.Logger
import liveplugin.*

show("View Binding: ${project?.name}")

registerAction(id = "Replace ButterKnife", keyStroke = "ctrl shift H") { event: com.intellij.openapi.actionSystem.AnActionEvent ->
    val project = event.project ?: return@registerAction
    val editor = event.editor ?: return@registerAction
    val logger = Logger.getInstance("HelloLogger")
    // Document modifications must be done inside "commands" which will support undo/redo functionality.
    editor.document.executeCommand(project, description = "Replace ButterKnife") {
        var output = text
        val viewBindingAnnotations = text.split("@BindView").drop(1)
        val viewBindingData = viewBindingAnnotations.map {
            ViewElement(
                id = it.substringAfter("(")
                    .substringBefore(")")
                    .trim(),
                initialVarName = it.substringAfter("var ")
                    .substringBefore(":")
                    .trim(),
            )

        }

        val layoutId = getLayoutId(text)
        if (layoutId == null) {
            show("Unable to find ButterKnife!")
            return@executeCommand
        }
        show(layoutId)
        val layoutBinding = getBindingName(layoutId)

        viewBindingData.forEach {
            output = output.replace("@BindView[^:]*:.*".toRegex(), "")
                .replace(it.initialVarName, "$B." + it.finalVarName)
        }

        output = output.replace("import butterknife.ButterKnife", "import com.invizio.diva.databinding.$layoutBinding")
        output = output.replaceFirst("{", "{\n    lateinit var $B : $layoutBinding")
        output = output.replace("ButterKnife.bind(.*)".toRegex(), "$B = $layoutBinding.inflate(inflater)")
        output = output.replace(".+inflater.inflate\\(.*".toRegex(), "")
        output = output.replace(ON_CREATE_BLOCK_REGEX) {
            it.value.replace("return(.|\\n)*?}".toRegex()) {
                it.value.replace("return.*", "return $B.root")
            }
        }
        println("VIEW IDS ******* \n${output}")

        setText(output)
        show("Butter knife is removed from ${project.currentFile?.name}")

    }
}
"R.id.sales_quotation_recycler"
val ON_CREATE_BLOCK_REGEX = "onCreateView\\((.|\\n)*?return(.|\\n)*?}".toRegex()

//ButterKnife.bind(this, v)
val B = "b"
data class ViewElement(
    val id : String,
    val initialVarName: String
) {
    val finalVarName: String = getViewBindingName(id)
}

fun getOldViewVarName(text : String) : String {
    return ""
}

fun getOnCreateBlock(text : String) : String {
    return ON_CREATE_BLOCK_REGEX.find(text)!!.value
}

/**
 * Get name generated by view binding.
 * @param id id of the view
 */
fun getViewBindingName(id: String) : String {
    var s = ""
    var indexToBeCapitalized = 1000
    val idString = id.substringAfterLast(".")
    for (i in idString.indices) {
        if (idString[i] == '_') {
            s += ""
            indexToBeCapitalized = i + 1
            continue
        }
        if (i == indexToBeCapitalized) {
            s += idString[i].uppercase()
            continue
        }
        s += idString[i]
    }
    return s
}

fun getLayoutId(text: String) : String? {
    return "\\.inflate\\(.*".toRegex()
        .find(text)?.value
        ?.substringAfter("(")
        ?.substringBefore(",")?.trim()
}

fun getBindingName(id: String) : String {
    return getViewBindingName(id).capitalize() + "Binding"
}
//@BindView\([A-z.]+\)

//fun isFragment()