add indent config

indent/lalrpop.vim

@@ -0,0 +1,22 @@
+" Vim indent file
+" Language:     LALRPOP Grammar File
+" Author:       Roland Fredenhagen <dev@modprog.de>
+" Date:         December 11, 2022
+" File Types:   lalrpop
+" Version:      1
+" Notes:        Largely taken from rust.vim's configuration
+
+" Only load this indent file when no other was loaded.
+if exists("b:did_indent")
+    finish
+endif
+let b:did_indent = 1
+
+setlocal cindent
+setlocal cinoptions=L0,(s,Ws,J1,j1,m1,n-4
+setlocal cinkeys=0{,0},!^F,o,O,0[,0],0(,0)
+
+" Some preliminary settings
+setlocal nolisp		" Make sure lisp indenting doesn't supersede us
+
+let b:undo_indent = "setlocal cindent< cinoptions< cinkeys< lisp<"