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-rw-r--r--runtime/indent/j.vim50
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+" 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