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-rw-r--r--runtime/indent/hamster.vim70
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diff --git a/runtime/indent/hamster.vim b/runtime/indent/hamster.vim
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+" Vim indent file
+" Language: Hamster Script
+" Version: 2.0.6.1
+" Last Change: 2021 Oct 11
+" Maintainer: David Fishburn <dfishburn dot vim at gmail dot com>
+" Download: https://www.vim.org/scripts/script.php?script_id=1099
+"
+" 2.0.6.1 (Oct 2021)
+" Added b:undo_indent
+" Added cpo check
+"
+
+" Only load this indent file when no other was loaded.
+if exists("b:did_indent")
+ finish
+endif
+let b:did_indent = 1
+
+setlocal indentkeys+==~if,=~else,=~endif,=~endfor,=~endwhile
+setlocal indentkeys+==~do,=~until,=~while,=~repeat,=~for,=~loop
+setlocal indentkeys+==~sub,=~endsub
+
+let b:undo_indent = "setl indentkeys<"
+
+" Define the appropriate indent function but only once
+setlocal indentexpr=HamGetFreeIndent()
+if exists("*HamGetFreeIndent")
+ finish
+endif
+
+let s:keepcpo = &cpo
+set cpo&vim
+
+function HamGetIndent(lnum)
+ let ind = indent(a:lnum)
+ let prevline=getline(a:lnum)
+
+ " Add a shiftwidth to statements following if, else, elseif,
+ " case, select, default, do, until, while, for, start
+ if prevline =~? '^\s*\<\(if\|else\%(if\)\?\|for\|repeat\|do\|while\|sub\)\>'
+ let ind = ind + shiftwidth()
+ endif
+
+ " Subtract a shiftwidth from else, elseif, end(if|while|for), until
+ let line = getline(v:lnum)
+ if line =~? '^\s*\(else\|elseif\|loop\|until\|end\%(if\|while\|for\|sub\)\)\>'
+ let ind = ind - shiftwidth()
+ endif
+
+ return ind
+endfunction
+
+function HamGetFreeIndent()
+ " 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=HamGetIndent(lnum)
+ return ind
+endfunction
+
+" Restore:
+let &cpo = s:keepcpo
+unlet s:keepcpo
+
+" vim:sw=2 tw=80