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+" Copyright 2011 The Go Authors. All rights reserved.
+" Use of this source code is governed by a BSD-style
+" license that can be found in the LICENSE file.
+"
+" indent/go.vim: Vim indent file for Go.
+"
+" TODO:
+" - function invocations split across lines
+" - general line splits (line ends in an operator)
+
+if exists("b:did_indent")
+ finish
+endif
+let b:did_indent = 1
+
+" C indentation is too far off useful, mainly due to Go's := operator.
+" Let's just define our own.
+setlocal nolisp
+setlocal autoindent
+setlocal indentexpr=GoIndent(v:lnum)
+setlocal indentkeys+=<:>,0=},0=)
+
+if exists("*GoIndent")
+ finish
+endif
+
+function! GoIndent(lnum)
+ let prevlnum = prevnonblank(a:lnum-1)
+ if prevlnum == 0
+ " top of file
+ return 0
+ endif
+
+ " grab the previous and current line, stripping comments.
+ let prevl = substitute(getline(prevlnum), '//.*$', '', '')
+ let thisl = substitute(getline(a:lnum), '//.*$', '', '')
+ let previ = indent(prevlnum)
+
+ let ind = previ
+
+ if prevl =~ '[({]\s*$'
+ " previous line opened a block
+ let ind += &sw
+ endif
+ if prevl =~# '^\s*\(case .*\|default\):$'
+ " previous line is part of a switch statement
+ let ind += &sw
+ endif
+ " TODO: handle if the previous line is a label.
+
+ if thisl =~ '^\s*[)}]'
+ " this line closed a block
+ let ind -= &sw
+ endif
+
+ " Colons are tricky.
+ " We want to outdent if it's part of a switch ("case foo:" or "default:").
+ " We ignore trying to deal with jump labels because (a) they're rare, and
+ " (b) they're hard to disambiguate from a composite literal key.
+ if thisl =~# '^\s*\(case .*\|default\):$'
+ let ind -= &sw
+ endif
+
+ return ind
+endfunction