Add editorconfig.kak by Enrico Lumetti

Closes #514

rc/extra/editorconfig.kak

@@ -0,0 +1,33 @@
+def editorconfig-load -docstring "Set indentation options according to editorconfig file" %{
+    %sh{
+        command -v editorconfig >/dev/null 2>&1 || { echo "echo -color Error The editorconfig tool could not be found"; exit 1; }
+        editorconfig $kak_buffile | awk -F= -- \
+            '{
+                 if ($1 == "indent_style" && $2 == "tab") {
+                     print "set buffer indentwidth 0" 
+                 }
+                 else if ($1 == "indent_size" && $2 ~ "[0-9]+") {
+                     print "set buffer indentwidth", $2
+                 }
+                 else if ($1 == "tab_width" && $2 ~ "[0-9]+") {
+                     print "set buffer tabstop", $2  
+                 }
+                 else if ($1 == "end_of_line") {
+                     if ($2 == "lf" || $2 == "crlf") {
+                        print "set buffer eolformat", $2
+                     }
+                     else {
+                        print "echo -color yellow",$2,"is not a valid eolformat string: ignored\"" 
+                     }
+                 }
+                 else if ($1 == "charset") {
+                     if ($2 == "utf-8-bom") {
+                         print "set buffer BOM utf8"
+                     }
+                     else {
+                         print "set buffer BOM none"
+                     }
+                 }
+             }'
+    }
+}