Only use range arguments in visual mode for autopep8.

README.md

@@ -82,6 +82,12 @@ let g:autoformat_remove_trailing_spaces = 0
 
 To disable or re-enable these option for specific buffers, use the buffer local variants:
 `b:autoformat_autoindent`, `b:autoformat_retab` and `b:autoformat_remove_trailing_spaces`.
+So to disable autoindent for filetypes that have incompetent indent files, use
+
+```vim
+autocmd FileType vim,tex let b:autoformat_autoindent=0
+```
+
 You can manually autoindent, retab or remove trailing whitespace with the following respective
 commands.
 

plugin/defaults.vim

@@ -23,9 +23,20 @@ endif
 
 " Python
 if !exists('g:formatdef_autopep8')
-    let g:formatdef_autopep8 = '"autopep8 - --range ".a:firstline." ".a:lastline." ".(&textwidth ? "--max-line-length=".&textwidth : "")'
+    " Autopep8 will not do indentation fixes when a range is specified, so we
+    " only pass a range when there is a visual selection that is not the
+    " entire file. See #125.
+    let g:formatdef_autopep8 = '"autopep8 -".(g:DoesRangeEqualBuffer(a:firstline, a:lastline) ? " --range ".a:firstline." ".a:lastline : "")." ".(&textwidth ? "--max-line-length=".&textwidth : "")'
 endif
 
+" There doesn't seem to be a reliable way to detect if are in some kind of visual mode,
+" so we use this as a workaround. We compare the length of the file against
+" the range arguments. If there is no range given, the range arguments default
+" to the entire file, so we return false if the range comprises the entire file.
+function! g:DoesRangeEqualBuffer(first, last)
+    return line('$') != a:last - a:first + 1
+endfunction
+
 if !exists('g:formatters_python')
     let g:formatters_python = ['autopep8']
 endif