Implement vim buffer commands :bp, :bn, :bf, :bl and :b[uffer]

src/test/java/org/jetbrains/plugins/ideavim/ex/implementation/commands/FirstCommandTest.kt

@@ -20,4 +20,28 @@ class FirstCommandTest : VimTestCase() {
     val command = injector.vimscriptParser.parseCommand("first")
     assertTrue(command is SelectFirstFileCommand)
   }
+
+  @Test
+  fun `command parsing bfirst`() {
+    val command = injector.vimscriptParser.parseCommand("bfirst")
+    assertTrue(command is SelectFirstFileCommand)
+  }
+
+  @Test
+  fun `command parsing bf`() {
+    val command = injector.vimscriptParser.parseCommand("bf")
+    assertTrue(command is SelectFirstFileCommand)
+  }
+
+  @Test
+  fun `command parsing brewind`() {
+    val command = injector.vimscriptParser.parseCommand("brewind")
+    assertTrue(command is SelectFirstFileCommand)
+  }
+
+  @Test
+  fun `command parsing br`() {
+    val command = injector.vimscriptParser.parseCommand("br")
+    assertTrue(command is SelectFirstFileCommand)
+  }
 }

src/test/java/org/jetbrains/plugins/ideavim/ex/implementation/commands/LastCommandTest.kt

@@ -20,4 +20,16 @@ class LastCommandTest : VimTestCase() {
     val command = injector.vimscriptParser.parseCommand("last")
     assertTrue(command is SelectLastFileCommand)
   }
+
+  @Test
+  fun `command parsing blast`() {
+    val command = injector.vimscriptParser.parseCommand("blast")
+    assertTrue(command is SelectLastFileCommand)
+  }
+
+  @Test
+  fun `command parsing bl`() {
+    val command = injector.vimscriptParser.parseCommand("bl")
+    assertTrue(command is SelectLastFileCommand)
+  }
 }

src/test/java/org/jetbrains/plugins/ideavim/ex/implementation/commands/NextFileCommandTest.kt

@@ -20,4 +20,16 @@ class NextFileCommandTest : VimTestCase() {
     val command = injector.vimscriptParser.parseCommand("next")
     assertTrue(command is NextFileCommand)
   }
+
+  @Test
+  fun `command parsing bnext`() {
+    val command = injector.vimscriptParser.parseCommand("bnext")
+    assertTrue(command is NextFileCommand)
+  }
+
+  @Test
+  fun `command parsing bn`() {
+    val command = injector.vimscriptParser.parseCommand("bn")
+    assertTrue(command is NextFileCommand)
+  }
 }

src/test/java/org/jetbrains/plugins/ideavim/ex/implementation/commands/PreviousFileCommandTest.kt

@@ -22,4 +22,16 @@ class PreviousFileCommandTest : VimTestCase() {
     assertTrue(command is PreviousFileCommand)
     assertEquals("4", command.argument)
   }
+
+  @Test
+  fun `command parsing bprevious`() {
+    val command = injector.vimscriptParser.parseCommand("bprevious")
+    assertTrue(command is PreviousFileCommand)
+  }
+
+  @Test
+  fun `command parsing bp`() {
+    val command = injector.vimscriptParser.parseCommand("bp")
+    assertTrue(command is PreviousFileCommand)
+  }
 }

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/vimscript/model/commands/SelectFirstFileCommand.kt → vim-engine/src/main/kotlin/com/maddyhome/idea/vim/vimscript/model/commands/BfirstCommand.kt

@@ -17,14 +17,14 @@ import com.maddyhome.idea.vim.ex.ranges.Range
 import com.maddyhome.idea.vim.vimscript.model.ExecutionResult
 
 /**
- * see "h :first"
+ * see "h :bfirst"
  */
-@ExCommand(command = "fir[st]")
-data class SelectFirstFileCommand(val range: Range, val modifier: CommandModifier, val argument: String) :
+@ExCommand(command = "bf[irst],br[ewind]")
+data class BfirstCommand(val range: Range, val modifier: CommandModifier, val argument: String) :
   Command.SingleExecution(range, modifier, argument) {
 
   override val argFlags: CommandHandlerFlags =
-    flags(RangeFlag.RANGE_OPTIONAL, ArgumentFlag.ARGUMENT_OPTIONAL, Access.READ_ONLY)
+    flags(RangeFlag.RANGE_FORBIDDEN, ArgumentFlag.ARGUMENT_FORBIDDEN, Access.READ_ONLY)
 
   override fun processCommand(
     editor: VimEditor,

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/vimscript/model/commands/SelectLastFileCommand.kt → vim-engine/src/main/kotlin/com/maddyhome/idea/vim/vimscript/model/commands/BlastCommand.kt

@@ -17,14 +17,14 @@ import com.maddyhome.idea.vim.ex.ranges.Range
 import com.maddyhome.idea.vim.vimscript.model.ExecutionResult
 
 /**
- * see "h :last"
+ * see "h :blast"
  */
-@ExCommand(command = "la[st]")
-data class SelectLastFileCommand(val range: Range, val modifier: CommandModifier, val argument: String) :
+@ExCommand(command = "bl[ast]")
+data class BlastCommand(val range: Range, val modifier: CommandModifier, val argument: String) :
   Command.SingleExecution(range, modifier, argument) {
 
   override val argFlags: CommandHandlerFlags =
-    flags(RangeFlag.RANGE_OPTIONAL, ArgumentFlag.ARGUMENT_OPTIONAL, Access.READ_ONLY)
+    flags(RangeFlag.RANGE_FORBIDDEN, ArgumentFlag.ARGUMENT_FORBIDDEN, Access.READ_ONLY)
 
   override fun processCommand(
     editor: VimEditor,