From 71a3346906c1c3785ba536a4bb589790d2c068d8 Mon Sep 17 00:00:00 2001
From: David Bailey <davidbailey.2889@gmail.com>
Date: Mon, 17 Apr 2023 16:33:41 +0200
Subject: [PATCH] feat: :sparkles: add a YAML config load engine

TODO: This needs to be replaced with a dynamic loader system
---
 lib/comfpile/engines/config_engine.rb | 70 +++++++++++++++++++++++++++
 1 file changed, 70 insertions(+)
 create mode 100644 lib/comfpile/engines/config_engine.rb

diff --git a/lib/comfpile/engines/config_engine.rb b/lib/comfpile/engines/config_engine.rb
new file mode 100644
index 0000000..7c76013
--- /dev/null
+++ b/lib/comfpile/engines/config_engine.rb
@@ -0,0 +1,70 @@
+
+require 'yaml'
+
+class ::Hash
+    def deep_merge(second)
+        merger = proc { |_, v1, v2| Hash === v1 && Hash === v2 ? v1.merge(v2, &merger) : Array === v1 && Array === v2 ? v1 | v2 : [:undefined, nil, :nil].include?(v2) ? v1 : v2 }
+        merge(second.to_h, &merger)
+    end
+end
+
+module Comfpile
+    class ConfigArtefact < Artefact
+        attr_reader :loaded_config
+        attr_reader :config
+
+        attr_reader :mtime
+
+        def initialize(*args, **opts)
+            super(*args, **opts)
+
+            @loaded_config = {}
+            
+            unless @target == '.' or @target == ''
+                parent_artefact :config_file, File.dirname(@target) 
+            end
+
+            @config_file_artefact = craft_artefact(:sourcefile, File.join(@target, "comf.yml"))
+            wait_on @config_file_artefact 
+
+            add_step do
+                unless @config_file_artefact.nil?
+                    @loaded_config = YAML.load_file(@config_file_artefact.file)
+    
+                    log "Config file found and loaded for directory #{@target}!"
+                end
+                
+                fail! "Config YAML file is not a hash!" unless @loaded_config.is_a? Hash
+
+                if @parent_artefact.nil?
+                    @config = @loaded_config
+                    @mtime = @config_file_artefact.mtime
+                else
+                    defaults = @loaded_config['defaults'] || {}
+
+                    @config = defaults.deep_merge(@parent_artefact.config.deep_merge(@loaded_config))
+                    @mtime = [@config_file_artefact.mtime, @parent_artefact.mtime].max
+                end
+            end
+        end
+
+        def [](key)
+            @config[key]
+        end
+
+        undef []=
+    end
+
+    class ConfigLoaderEngine < ArtefactEngine
+        def initialize(core, **options)
+            super(core, **options)
+
+        end
+
+        def craft(stage, target)
+            return unless stage == :config_file
+
+            ConfigArtefact.new(@core, self, stage, target)
+        end
+    end
+end
\ No newline at end of file