Merge branch 'darkfeline-fix-57'

* darkfeline-fix-57:
  Update help file
  Add file for testing when `shiftwidth=0` is used
  Set size of indent guide to `tabstop` value when `shiftwidth=0` is used

autoload/indent_guides.vim

@@ -180,7 +180,11 @@ endfunction
 " plugin is enabled.
 "
 function! indent_guides#init_script_vars()
+  if &l:shiftwidth > 0
     let s:indent_size = &l:shiftwidth
+  else
+    let s:indent_size = &l:tabstop
+  endif
   let s:guide_size  = indent_guides#calculate_guide_size()
   let s:hi_normal   = indent_guides#capture_highlight('Normal')
 

doc/indent_guides.txt

@@ -260,6 +260,8 @@ Bug reports, feedback, suggestions etc are welcomed.
     soft indentation (thanks @sergey-vlasov).
   * Added option g:|indent_guides_default_mapping| to control whether the
     default mapping (<Leader>ig) gets set (thanks @suy).
+  * Set size of indent guide to `tabstop` value when `shiftwidth=0` is used
+    (thanks @darkfeline).
 
 1.7~
   * Added way to override the default mapping (thanks @xuhdev).

test-files/test-ts2sw0et.txt

@@ -0,0 +1,47 @@
+vim:tw=78:ts=2:sw=0:et:nolist
+
+test
+  test
+    test
+      test
+        test
+          test
+            test
+              test
+                test
+                  test
+                    test
+                      test
+                        test
+                          test
+                            test
+                              test
+                                test
+                                  test
+                                    test
+                                      test
+                                        test
+                                          test
+
+test
+	test
+		test
+			test
+				test
+					test
+						test
+							test
+								test
+									test
+										test
+											test
+												test
+													test
+														test
+															test
+																test
+																	test
+																		test
+																			test
+																				test
+																					test