fix of #761

tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/buttons/InlineKeyboardMarkup.kt

@@ -25,4 +25,23 @@ data class InlineKeyboardMarkup(
             }
         }
     }
+
+    operator fun plus(other: InlineKeyboardMarkup): InlineKeyboardMarkup {
+        return InlineKeyboardMarkup(
+            keyboard + other.keyboard
+        )
+    }
+
+    operator fun minus(other: InlineKeyboardMarkup): InlineKeyboardMarkup {
+        val otherButtons = other.keyboard.flatten()
+        return InlineKeyboardMarkup(
+            keyboard.mapNotNull { row ->
+                row.filter { button ->
+                    button !in otherButtons
+                }.takeIf {
+                    it.isNotEmpty()
+                }
+            }
+        )
+    }
 }

tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/buttons/ReplyKeyboardMarkup.kt

@@ -22,4 +22,32 @@ data class ReplyKeyboardMarkup(
             error("Field $inputFieldPlaceholderField length must be in $inputFieldPlaceholderLimit, but was ${inputFieldPlaceholder.length}")
         }
     }
+
+    fun add(other: ReplyKeyboardMarkup, placeholderDelimiter: String = "\n"): ReplyKeyboardMarkup {
+        return ReplyKeyboardMarkup(
+            keyboard = keyboard + other.keyboard,
+            resizeKeyboard = resizeKeyboard ?.or(other.resizeKeyboard ?: false) ?: other.resizeKeyboard,
+            oneTimeKeyboard = oneTimeKeyboard ?.or(other.oneTimeKeyboard ?: false) ?: other.oneTimeKeyboard,
+            inputFieldPlaceholder = inputFieldPlaceholder ?.plus(other.inputFieldPlaceholder ?.let { placeholderDelimiter + it } ?: "") ?: other.inputFieldPlaceholder,
+            selective = selective ?.or(other.selective ?: false) ?: other.selective,
+            persistent = persistent ?.or(other.persistent ?: false) ?: other.persistent,
+        )
+    }
+
+    operator fun plus(other: ReplyKeyboardMarkup): ReplyKeyboardMarkup {
+        return add(other)
+    }
+
+    operator fun minus(other: ReplyKeyboardMarkup): ReplyKeyboardMarkup {
+        val otherButtons = other.keyboard.flatten()
+        return copy(
+            keyboard.mapNotNull { row ->
+                row.filter { button ->
+                    button !in otherButtons
+                }.takeIf {
+                    it.isNotEmpty()
+                }
+            }
+        )
+    }
 }

tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/utils/Matrix.kt

@@ -1,5 +1,6 @@
 package dev.inmo.tgbotapi.utils
 
+import dev.inmo.micro_utils.common.withReplaced
 import dev.inmo.tgbotapi.types.buttons.Matrix
 
 /**
@@ -67,6 +68,18 @@ open class RowBuilder<T> {
 
     fun add(t: T) = mutRow.add(t)
     operator fun T.unaryPlus() = add(this)
+
+    fun replace(i: Int, new: T) {
+        mutRow[i] = new
+    }
+    fun replace(old: T, new: T): Boolean {
+        val i = mutRow.indexOf(old).takeIf { it > -1 } ?: return false
+        replace(i, new)
+        return mutRow[i] == new
+    }
+    fun remove(i: Int): T {
+        return mutRow.removeAt(i)
+    }
 }
 
 open class MatrixBuilder<T> {
@@ -77,4 +90,18 @@ open class MatrixBuilder<T> {
     fun add(t: List<T>) = mutMatrix.add(t)
     operator fun plus(t: List<T>) = add(t)
     operator fun T.unaryPlus() = add(listOf(this))
+
+    fun modifyRow(i: Int, block: RowBuilder<T>.() -> Unit) {
+        val exists = matrix[i]
+        val rowBuilder = RowBuilder<T>()
+        exists.forEach { rowBuilder.add(it) }
+        mutMatrix[i] = rowBuilder.apply(block).row
+    }
+    fun modifyRow(row: List<T>, block: RowBuilder<T>.() -> Unit) {
+        val i = mutMatrix.indexOf(row).takeIf { it > -1 } ?: return false
+        modifyRow(i, block)
+    }
+    fun remove(i: Int): List<T> {
+        return mutMatrix.removeAt(i)
+    }
 }

tgbotapi.utils/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/utils/types/buttons/InlineKeyboardBuilder.kt

@@ -49,6 +49,19 @@ inline fun flatInlineKeyboard(
     block: InlineKeyboardRowBuilder.() -> Unit
 ) = inlineKeyboard { row<InlineKeyboardButton>(block) }
 
+/**
+ * Factory-function for [InlineKeyboardBuilder]. It will [apply] [block] to internally created [InlineKeyboardMarkup]
+ * and [InlineKeyboardBuilder.build] [InlineKeyboardMarkup] then
+ *
+ * @see InlineKeyboardBuilder.row
+ */
+inline fun InlineKeyboardMarkup.modified(
+    block: InlineKeyboardBuilder.() -> Unit
+) = InlineKeyboardBuilder().apply {
+    keyboard.forEach { add(it) }
+    block()
+}.build()
+
 
 /**
  * Creates and put [PayInlineKeyboardButton]