1 files changed, 63 insertions, 0 deletions
diff --git a/runtime/indent/rpl.vim b/runtime/indent/rpl.vim
new file mode 100644
index 0000000..fab258e
--- /dev/null
+++ b/runtime/indent/rpl.vim
@@ -0,0 +1,63 @@
+" Vim indent file
+" Language:	RPL/2
+" Version:	0.2
+" Last Change:	2017 Jun 13
+" Maintainer:	BERTRAND Joël <rpl2@free.fr>
+
+" Only load this indent file when no other was loaded.
+if exists("b:did_indent")
+  finish
+endif
+let b:did_indent = 1
+
+setlocal autoindent
+setlocal indentkeys+==~end,=~case,=~if,=~then,=~else,=~do,=~until,=~while,=~repeat,=~select,=~default,=~for,=~start,=~next,=~step,<<>,<>>
+
+" Define the appropriate indent function but only once
+setlocal indentexpr=RplGetFreeIndent()
+if exists("*RplGetFreeIndent")
+  finish
+endif
+
+let b:undo_indent = "set ai< indentkeys< indentexpr<"
+
+function RplGetIndent(lnum)
+  let ind = indent(a:lnum)
+  let prevline=getline(a:lnum)
+  " Strip tail comment
+  let prevstat=substitute(prevline, '!.*$', '', '')
+
+  " Add a shiftwidth to statements following if, iferr, then, else, elseif,
+  " case, select, default, do, until, while, repeat, for, start
+  if prevstat =~? '\<\(if\|iferr\|do\|while\)\>' && prevstat =~? '\<end\>'
+  elseif prevstat =~? '\(^\|\s\+\)<<\($\|\s\+\)' && prevstat =~? '\s\+>>\($\|\s\+\)'
+  elseif prevstat =~? '\<\(if\|iferr\|then\|else\|elseif\|select\|case\|do\|until\|while\|repeat\|for\|start\|default\)\>' || prevstat =~? '\(^\|\s\+\)<<\($\|\s\+\)'
+    let ind = ind + shiftwidth()
+  endif
+
+  " Subtract a shiftwidth from then, else, elseif, end, until, repeat, next,
+  " step
+  let line = getline(v:lnum)
+  if line =~? '^\s*\(then\|else\|elseif\|until\|repeat\|next\|step\|default\|end\)\>'
+    let ind = ind - shiftwidth()
+  elseif line =~? '^\s*>>\($\|\s\+\)'
+    let ind = ind - shiftwidth()
+  endif
+
+  return ind
+endfunction
+
+function RplGetFreeIndent()
+  " Find the previous non-blank line
+  let lnum = prevnonblank(v:lnum - 1)
+
+  " Use zero indent at the top of the file
+  if lnum == 0
+    return 0
+  endif
+
+  let ind=RplGetIndent(lnum)
+  return ind
+endfunction
+
+" vim:sw=2 tw=130