1 files changed, 50 insertions, 0 deletions
diff --git a/runtime/indent/j.vim b/runtime/indent/j.vim
new file mode 100644
index 0000000..c308512
--- /dev/null
+++ b/runtime/indent/j.vim
@@ -0,0 +1,50 @@
+" Vim indent file
+" Language:	J
+" Maintainer:	David Bürgin <dbuergin@gluet.ch>
+" URL:		https://gitlab.com/glts/vim-j
+" Last Change:	2015-01-11
+
+if exists('b:did_indent')
+  finish
+endif
+let b:did_indent = 1
+
+setlocal indentexpr=GetJIndent()
+setlocal indentkeys-=0{,0},:,0#
+setlocal indentkeys+=0),0<:>,=case.,=catch.,=catchd.,=catcht.,=do.,=else.,=elseif.,=end.,=fcase.
+
+let b:undo_indent = 'setlocal indentkeys< indentexpr<'
+
+if exists('*GetJIndent')
+  finish
+endif
+
+" If g:j_indent_definitions is true, the bodies of explicit definitions of
+" adverbs, conjunctions, and verbs will be indented. Default is false (0).
+if !exists('g:j_indent_definitions')
+  let g:j_indent_definitions = 0
+endif
+
+function GetJIndent() abort
+  let l:prevlnum = prevnonblank(v:lnum - 1)
+  if l:prevlnum == 0
+    return 0
+  endif
+  let l:indent = indent(l:prevlnum)
+  let l:prevline = getline(l:prevlnum)
+  if l:prevline =~# '^\s*\%(case\|catch[dt]\=\|do\|else\%(if\)\=\|fcase\|for\%(_\a\k*\)\=\|if\|select\|try\|whil\%(e\|st\)\)\.\%(\%(\<end\.\)\@!.\)*$'
+    " Increase indentation after an initial control word that starts or
+    " continues a block and is not terminated by "end."
+    let l:indent += shiftwidth()
+  elseif g:j_indent_definitions && (l:prevline =~# '\<\%([1-4]\|13\|adverb\|conjunction\|verb\|monad\|dyad\)\s\+\%(:\s*0\|def\s\+0\|define\)\>' || l:prevline =~# '^\s*:\s*$')
+    " Increase indentation in explicit definitions of adverbs, conjunctions,
+    " and verbs
+    let l:indent += shiftwidth()
+  endif
+  " Decrease indentation in lines that start with either control words that
+  " continue or end a block, or the special items ")" and ":"
+  if getline(v:lnum) =~# '^\s*\%()\|:\|\%(case\|catch[dt]\=\|do\|else\%(if\)\=\|end\|fcase\)\.\)'
+    let l:indent -= shiftwidth()
+  endif
+  return l:indent
+endfunction