Simple haml support

autoload/sj/haml.vim

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+" TODO (2013-05-09) Only works for very simple things, needs work
+function! sj#haml#SplitInterpolation()
+  let lineno  = line('.')
+  let line    = getline('.')
+  let indent  = indent('.')
+  let pattern = '^\s*%.\{-}\zs='
+
+  if line !~ pattern
+    return 0
+  endif
+
+  exe 's/'.pattern.'/\r=/'
+  call s:SetIndent(lineno + 1, lineno + 1, indent + &sw)
+
+  return 1
+endfunction
+
+function! sj#haml#JoinInterpolation()
+  if line('.') == line('$')
+    return 0
+  endif
+
+  let line      = getline('.')
+  let next_line = getline(line('.') + 1)
+
+  if !(line =~ '^\s*%\k\+\s*$' && next_line =~ '^\s*=')
+    return 0
+  end
+
+  s/\n\s*//
+  return 1
+endfunction
+
+" Sets the absolute indent of the given range of lines to the given indent
+function! s:SetIndent(from, to, indent)
+  let new_whitespace = repeat(' ', a:indent)
+  exe a:from.','.a:to.'s/^\s*/'.new_whitespace
+endfunction

examples/test.haml

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+%div
+  %span
+    = 1 + 2

ftplugin/haml/splitjoin.vim

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+let b:splitjoin_split_callbacks = [
+      \ 'sj#haml#SplitInterpolation'
+      \ ]
+
+let b:splitjoin_join_callbacks = [
+      \ 'sj#haml#JoinInterpolation'
+      \ ]

spec/plugin/haml_spec.rb

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+require 'spec_helper'
+
+describe "haml" do
+  let(:filename) { 'test.haml' }
+
+  # Haml is not built-in, so let's set it up manually
+  def setup_haml_filetype
+    vim.set(:filetype, 'haml')
+    vim.set(:expandtab)
+    vim.set(:shiftwidth, 2)
+  end
+
+  specify "interpolation" do
+    set_file_contents '%div= 1 + 2'
+    setup_haml_filetype
+
+    split
+
+    assert_file_contents <<-EOF
+      %div
+        = 1 + 2
+    EOF
+
+    join
+
+    assert_file_contents '%div= 1 + 2'
+  end
+end