feat: add configurable diff modes and split orientation

src/ruby_config.rb

@@ -141,6 +141,8 @@ module Vamp
       @labels = {}
       @diff_context_lines = 10
       @diff_expand_lines = 15
+      @diff_view_mode = "split"
+      @diff_split_orientation = "left_right"
     end
 
     # @param path [String] relative to the configuration file
@@ -205,6 +207,24 @@ module Vamp
       @diff_expand_lines = diff_line_count!(lines, "diff_expand_lines", 1)
     end
 
+    # @param mode [String] "split" or "unified"
+    # @return [String]
+    def diff_view_mode=(mode)
+      mode = nonempty_string!(mode, "diff view mode")
+      raise ArgumentError, "diff view mode must be split or unified" unless %w[split unified].include?(mode)
+      @diff_view_mode = mode
+    end
+
+    # @param orientation [String] "left_right" or "above_below"
+    # @return [String]
+    def diff_split_orientation=(orientation)
+      orientation = nonempty_string!(orientation, "diff split orientation")
+      unless %w[left_right above_below].include?(orientation)
+        raise ArgumentError, "diff split orientation must be left_right or above_below"
+      end
+      @diff_split_orientation = orientation
+    end
+
     # @return [Module<Vamp::Core>] frozen namespace with catalog-generated Action methods
     def core
       Core
@@ -238,7 +258,8 @@ module Vamp
         "file_explorer_view" => @file_explorer_view, "clipboard_mode" => @clipboard_mode,
         "top_bar" => @bar.top, "bottom_bar" => @bar.bottom, "labels" => @labels,
         "popup" => { "command" => @popup.command, "search" => @popup.search },
-        "diff_context_lines" => @diff_context_lines, "diff_expand_lines" => @diff_expand_lines }
+        "diff_context_lines" => @diff_context_lines, "diff_expand_lines" => @diff_expand_lines,
+        "diff_view_mode" => @diff_view_mode, "diff_split_orientation" => @diff_split_orientation }
     end
 
     private