Add depth to import strings WIP

Enable dots for nested objects: `- import fields myfield.subkey`. limited to 1 level for now.

Fixes #10

Author: regisphilibert

partials/private/import.html

@@ -15,9 +15,9 @@
     {{ with partialCached "tnd-netlifycms/private/import" . . }}
     {{ end }}
 */}}
-{{/* regex101.com > https://regex101.com/r/TFA6WQ/1 */}}
-{{ $pattern := "^([a-zA-Z]*) ([a-zA-Z/_-]*)$"}}
-{{ $string_pattern := "^import ([a-zA-Z]*) ([a-zA-Z/_-]*)$" }}
+{{/* regex101.com > https://regex101.com/r/mIrmn0/1 */}}
+{{ $pattern := "^([a-zA-Z]*) ([.a-zA-Z/_-]*)$"}}
+{{ $string_pattern := "^import ([a-zA-Z]*) ([.a-zA-Z/_-]*)$" }}
 {{/* Return variable, by default, will be the passed context */}}
 {{ $return := . }}
 {{ $type := false }}
@@ -59,13 +59,24 @@
     {{ if and $type $file }}
       {{/* We look for the matching data file located in `data/netlifycms/{Type}/{File}.yaml` */}}
       {{ with index site.Data.netlifycms (pluralize $type) }}
-        {{ with index . $file }}
+        {{ $with := index . $file }}
+        {{ $file_split := split $file "." }}
+        {{ if eq (len $file_split) 2 }}
+          {{ $with = index . (index $file_split 0) (index $file_split 1) }}
+        {{ end }}
+        {{ with $with }}
           {{ $return = . }}
           {{ with $extend }}
             {{ $return = merge $return . }}
           {{ end }}
         {{ else }}
-          {{ partial "tnd-netlifycms/warn" (printf "We couldn't find %s/%s" $type $file) }}
+          {{ $message := printf "We couldn't find %s/%s" $type $file }}
+          {{ with split $file "." }}
+            {{ if gt . 2 }}
+              {{ $message = print $message " because object depth is limited to 2" }}
+            {{ end }}
+          {{ end }}
+          {{ partial "tnd-netlifycms/warn" $message }}
         {{ end }}
       {{ else }}
         {{ partial "tnd-netlifycms/warn" (printf "We couldn't find Type %s" $type) }}