Fix multiline handling with blank lines (#111)

Author: blueyed

indent/python.vim

@@ -337,11 +337,11 @@ endfunction
 " Is the syntax at lnum (and optionally cnum) a python string?
 function! s:is_python_string(lnum, ...)
     let line = getline(a:lnum)
-    let linelen = len(line)
-    if linelen < 1
-      let linelen = 1
+    if a:0
+      let cols = type(a:1) != type([]) ? [a:1] : a:1
+    else
+      let cols = range(1, max([1, len(line)]))
     endif
-    let cols = a:0 ? type(a:1) != type([]) ? [a:1] : a:1 : range(1, linelen)
     for cnum in cols
         if match(map(synstack(a:lnum, cnum),
                     \ "synIDattr(v:val, 'name')"), 'python\S*String') == -1
@@ -361,7 +361,7 @@ function! GetPythonPEPIndent(lnum)
     let prevline = getline(a:lnum-1)
 
     " Multilinestrings: continous, docstring or starting.
-    if s:is_python_string(a:lnum-1, len(prevline))
+    if s:is_python_string(a:lnum-1, max([1, len(prevline)]))
                 \ && (s:is_python_string(a:lnum, 1)
                 \     || match(line, '^\%("""\|''''''\)') != -1)
 
@@ -379,8 +379,8 @@ function! GetPythonPEPIndent(lnum)
         endif
 
         if s:is_python_string(a:lnum-1)
-            " Previous line is (completely) a string.
-            return indent(a:lnum-1)
+            " Previous line is (completely) a string: keep current indent.
+            return -1
         endif
 
         if match(prevline, '^\s*\%("""\|''''''\)') != -1

spec/indent/indent_spec.rb

@@ -130,7 +130,7 @@
       vim.echo('synIDattr(synID(line("."), col("."), 0), "name")'
               ).downcase.should include 'string'
       vim.feedkeys 'a\<CR>'
-      proposed_indent.should == 0
+      proposed_indent.should == -1
       indent.should == 0
     end
 
@@ -464,7 +464,7 @@
     end
   end
 
-  describe "when after assigning an unfinished string" do
+  describe "when after assigning an indented unfinished string" do
     before { vim.feedkeys 'i    test = """' }
 
     it "it indents the next line" do
@@ -475,7 +475,7 @@
     end
   end
 
-  describe "when after assigning a finished string" do
+  describe "when after assigning an indented finished string" do
     before { vim.feedkeys 'i    test = ""' }
 
     it "it does indent the next line" do
@@ -508,12 +508,30 @@
   end
 
   describe "when breaking a string after opening parenthesis" do
-    before { vim.feedkeys 'i    foo("""bar<Left><Left><Left>' }
+    before { vim.feedkeys 'i    foo("""bar\<Left>\<Left>\<Left>' }
     it "it does indent the next line as after an opening multistring" do
       vim.feedkeys '\<CR>'
-      expected_proposed, expected_indent = multiline_indent(4, 4 + shiftwidth)
+      _, expected_indent = multiline_indent(4, 4 + shiftwidth)
       indent.should == expected_indent
-      proposed_indent.should == expected_proposed
+      proposed_indent.should == -1
+
+      # it keeps the indent after an empty line
+      vim.feedkeys '\<CR>'
+      proposed_indent, expected_indent = multiline_indent(4, 4 + shiftwidth)
+      indent.should == expected_indent
+      proposed_indent.should == proposed_indent
+
+      # it keeps the indent of nonblank above
+      vim.feedkeys '\<End>\<CR>'
+      proposed_indent, expected_indent = multiline_indent(4, 4 + shiftwidth)
+      indent.should == expected_indent
+      proposed_indent.should == proposed_indent
+
+      # it keeps the indent of nonblank above before an empty line
+      vim.feedkeys '\<CR>'
+      proposed_indent, expected_indent = multiline_indent(4, 4 + shiftwidth)
+      indent.should == expected_indent
+      proposed_indent.should == proposed_indent
     end
   end
 end