Update runtime files
diff --git a/runtime/indent/hare.vim b/runtime/indent/hare.vim
new file mode 100644
index 0000000..bc4fea4
--- /dev/null
+++ b/runtime/indent/hare.vim
@@ -0,0 +1,138 @@
+" Vim indent file
+" Language: Hare
+" Maintainer: Amelia Clarke <me@rsaihe.dev>
+" Last Change: 2022 Sep 22
+
+if exists("b:did_indent")
+ finish
+endif
+let b:did_indent = 1
+
+if !has("cindent") || !has("eval")
+ finish
+endif
+
+setlocal cindent
+
+" L0 -> don't deindent labels
+" (s -> use one indent after a trailing (
+" m1 -> if ) starts a line, indent it the same as its matching (
+" ks -> add an extra indent to extra lines in an if expression or for expression
+" j1 -> indent code inside {} one level when in parentheses
+" J1 -> see j1
+" *0 -> don't search for unclosed block comments
+" #1 -> don't deindent lines that begin with #
+setlocal cinoptions=L0,(s,m1,ks,j1,J1,*0,#1
+
+" Controls which keys reindent the current line.
+" 0{ -> { at beginning of line
+" 0} -> } at beginning of line
+" 0) -> ) at beginning of line
+" 0] -> ] at beginning of line
+" !^F -> <C-f> (not inserted)
+" o -> <CR> or `o` command
+" O -> `O` command
+" e -> else
+" 0=case -> case
+setlocal indentkeys=0{,0},0),0],!^F,o,O,e,0=case
+
+setlocal cinwords=if,else,for,switch,match
+
+setlocal indentexpr=GetHareIndent()
+
+function! FloorCindent(lnum)
+ return cindent(a:lnum) / shiftwidth() * shiftwidth()
+endfunction
+
+function! GetHareIndent()
+ let line = getline(v:lnum)
+ let prevlnum = prevnonblank(v:lnum - 1)
+ let prevline = getline(prevlnum)
+ let prevprevline = getline(prevnonblank(prevlnum - 1))
+
+ " This is all very hacky and imperfect, but it's tough to do much better when
+ " working with regex-based indenting rules.
+
+ " If the previous line ended with =, indent by one shiftwidth.
+ if prevline =~# '\v\=\s*(//.*)?$'
+ return indent(prevlnum) + shiftwidth()
+ endif
+
+ " If the previous line ended in a semicolon and the line before that ended
+ " with =, deindent by one shiftwidth.
+ if prevline =~# '\v;\s*(//.*)?$' && prevprevline =~# '\v\=\s*(//.*)?$'
+ return indent(prevlnum) - shiftwidth()
+ endif
+
+ " TODO: The following edge-case is still indented incorrectly:
+ " case =>
+ " if (foo) {
+ " bar;
+ " };
+ " | // cursor is incorrectly deindented by one shiftwidth.
+ "
+ " This only happens if the {} block is the first statement in the case body.
+ " If `case` is typed, the case will also be incorrectly deindented by one
+ " shiftwidth. Are you having fun yet?
+
+ " Deindent cases.
+ if line =~# '\v^\s*case'
+ " If the previous line was also a case, don't do any special indenting.
+ if prevline =~# '\v^\s*case'
+ return indent(prevlnum)
+ end
+
+ " If the previous line was a multiline case, deindent by one shiftwidth.
+ if prevline =~# '\v\=\>\s*(//.*)?$'
+ return indent(prevlnum) - shiftwidth()
+ endif
+
+ " If the previous line started a block, deindent by one shiftwidth.
+ " This handles the first case in a switch/match block.
+ if prevline =~# '\v\{\s*(//.*)?$'
+ return FloorCindent(v:lnum) - shiftwidth()
+ end
+
+ " If the previous line ended in a semicolon and the line before that wasn't
+ " a case, deindent by one shiftwidth.
+ if prevline =~# '\v;\s*(//.*)?$' && prevprevline !~# '\v\=\>\s*(//.*)?$'
+ return FloorCindent(v:lnum) - shiftwidth()
+ end
+
+ let l:indent = FloorCindent(v:lnum)
+
+ " If a normal cindent would indent the same amount as the previous line,
+ " deindent by one shiftwidth. This fixes some issues with `case let` blocks.
+ if l:indent == indent(prevlnum)
+ return l:indent - shiftwidth()
+ endif
+
+ " Otherwise, do a normal cindent.
+ return l:indent
+ endif
+
+ " Don't indent an extra shiftwidth for cases which span multiple lines.
+ if prevline =~# '\v\=\>\s*(//.*)?$' && prevline !~# '\v^\s*case\W'
+ return indent(prevlnum)
+ endif
+
+ " Indent the body of a case.
+ " If the previous line ended in a semicolon and the line before that was a
+ " case, don't do any special indenting.
+ if prevline =~# '\v;\s*(//.*)?$' && prevprevline =~# '\v\=\>\s*(//.*)?$' && line !~# '\v^\s*}'
+ return indent(prevlnum)
+ endif
+
+ let l:indent = FloorCindent(v:lnum)
+
+ " If the previous line was a case and a normal cindent wouldn't indent, indent
+ " an extra shiftwidth.
+ if prevline =~# '\v\=\>\s*(//.*)?$' && l:indent == indent(prevlnum)
+ return l:indent + shiftwidth()
+ endif
+
+ " If everything above is false, do a normal cindent.
+ return l:indent
+endfunction
+
+" vim: tabstop=2 shiftwidth=2 expandtab