Add Cython support (#48)

Just making indents after cdef and cpdef similar to def.  The variable
must be made buffer-local in case one is editing both Python and Cython
sources at the same time.

Author: anntzer

.gitignore

@@ -0,0 +1 @@
+.*.swp

indent/python.vim

@@ -40,7 +40,11 @@ let s:block_rules = {
             \ '^\s*finally\>': ['try', 'except', 'else']
             \ }
 let s:paren_pairs = ['()', '{}', '[]']
-let s:control_statement = '^\s*\(class\|def\|if\|while\|with\|for\|except\)\>'
+if &ft == 'pyrex' || &ft == 'cython'
+    let b:control_statement = '\v^\s*(class|def|if|while|with|for|except|cdef|cpdef)>'
+else
+    let b:control_statement = '\v^\s*(class|def|if|while|with|for|except)>'
+endif
 let s:stop_statement = '^\s*\(break\|continue\|raise\|return\|pass\)\>'
 
 " Skip strings and comments. Return 1 for chars to skip.
@@ -198,7 +202,7 @@ function! s:indent_like_opening_paren(lnum)
     " If this line is the continuation of a control statement
     " indent further to distinguish the continuation line
     " from the next logical line.
-    if text =~# s:control_statement && res == base + s:sw()
+    if text =~# b:control_statement && res == base + s:sw()
         return base + s:sw() * 2
     else
         return res
@@ -259,7 +263,7 @@ function! s:indent_like_previous_line(lnum)
         " If this line is the continuation of a control statement
         " indent further to distinguish the continuation line
         " from the next logical line.
-        if getline(start) =~# s:control_statement
+        if getline(start) =~# b:control_statement
             return base + s:sw() * 2
         endif
 

spec/indent/indent_spec.rb

@@ -457,3 +457,35 @@ def proposed_indent
 
   it_behaves_like "vim"
 end
+
+describe "vim for cython" do
+  before {
+    vim.command "enew"
+    vim.command "set ft=cython"
+    vim.command "runtime indent/python.vim"
+  }
+
+  def shiftwidth
+    @shiftwidth ||= vim.echo("exists('*shiftwidth') ? shiftwidth() : &sw").to_i
+  end
+  def tabstop
+    @tabstop ||= vim.echo("&tabstop").to_i
+  end
+  def indent
+    vim.echo("indent('.')").to_i
+  end
+
+  describe "when using a cdef function definition" do
+      it "indents shiftwidth spaces" do
+          vim.feedkeys 'icdef long_function_name(\<CR>arg'
+          indent.should == shiftwidth * 2
+      end
+  end
+
+  describe "when using a cpdef function definition" do
+      it "indents shiftwidth spaces" do
+          vim.feedkeys 'icpdef long_function_name(\<CR>arg'
+          indent.should == shiftwidth * 2
+      end
+  end
+end