add --auto-preview as per Yggdroot#882

README.md

@@ -109,6 +109,7 @@ optional arguments:
                         specifies the width of popup window, only available in popup mode.
   --no-sort             do not sort the result.
   --case-insensitive    fuzzy search case insensitively.
+  --auto-preview        open preview window automatically.
 
 subcommands:
 

autoload/leaderf/Any.vim

@@ -224,6 +224,7 @@ let g:Lf_CommonArguments = [
             \ {"name": ["--popup-width"], "nargs": 1, "help": "specifies the width of popup window, only available in popup mode."},
             \ {"name": ["--no-sort"], "nargs": 0, "help": "do not sort the result."},
             \ {"name": ["--case-insensitive"], "nargs": 0, "help": "fuzzy search case insensitively."},
+            \ {"name": ["--auto-preview"], "nargs": 0, "help": "open preview window automatically."},
             \]
 
 " arguments is something like g:Lf_CommonArguments

autoload/leaderf/python/leaderf/manager.py

@@ -896,6 +896,9 @@ def _needPreview(self, preview):
             preview:
                 if True, always preview the result no matter what `g:Lf_PreviewResult` is.
         """
+        if "--auto-preview" in self._arguments:
+            return True
+
         preview_dict = {k.lower(): v for k, v in lfEval("g:Lf_PreviewResult").items()}
         category = self._getExplorer().getStlCategory()
         if not preview and int(preview_dict.get(category.lower(), 0)) == 0: