[feat] Open with: choose which engine to use for file (#3653)

Fixes #3345

* Add SVG to MuPDF filetypes

spec/unit/document_registry_spec.lua

@@ -1,16 +1,17 @@
 describe("document registry module", function()
-    local DocumentRegistry
+    local DocSettings, DocumentRegistry
 
     setup(function()
         require("commonrequire")
+        DocSettings = require("docsettings")
         DocumentRegistry = require("document/documentregistry")
     end)
 
     it("should get preferred rendering engine", function()
-        assert.is_equal("Cool Reader Engine",
-                        DocumentRegistry:getProvider("bla.epub").provider_name)
-        assert.is_equal("MuPDF",
-                        DocumentRegistry:getProvider("bla.pdf").provider_name)
+        assert.is_equal("crengine",
+                        DocumentRegistry:getProvider("bla.epub").provider)
+        assert.is_equal("mupdf",
+                        DocumentRegistry:getProvider("bla.pdf").provider)
     end)
 
     it("should return all supported rendering engines", function()
@@ -20,4 +21,55 @@ describe("document registry module", function()
         assert.is_equal("MuPDF",
                         providers[2].provider.provider_name)
     end)
+
+    it("should set per-document setting for rendering engine", function()
+        local path = "../../foo.epub"
+        local pdf_provider = DocumentRegistry:getProvider("bla.pdf")
+        DocumentRegistry:setProvider(path, pdf_provider, false)
+
+        local provider = DocumentRegistry:getProvider(path)
+
+        assert.is_equal("mupdf", provider.provider)
+
+        local docsettings = DocSettings:open(path)
+        docsettings:purge()
+        docsettings:flush()
+    end)
+    it("should set global setting for rendering engine", function()
+        local path = "../../foo.fb2"
+        local pdf_provider = DocumentRegistry:getProvider("bla.pdf")
+        DocumentRegistry:setProvider(path, pdf_provider, true)
+
+        local provider = DocumentRegistry:getProvider(path)
+
+        assert.is_equal("mupdf", provider.provider)
+
+        G_reader_settings:delSetting("provider")
+    end)
+
+    it("should return per-document setting for rendering engine", function()
+        local path = "../../foofoo.epub"
+        local docsettings = DocSettings:open(path)
+        docsettings:saveSetting("provider", "mupdf")
+        docsettings:flush()
+
+        local provider = DocumentRegistry:getProvider(path)
+
+        assert.is_equal("mupdf", provider.provider)
+
+        docsettings:purge()
+        docsettings:flush()
+    end)
+    it("should return global setting for rendering engine", function()
+        local path = "../../foofoo.fb2"
+        local provider_setting = {}
+        provider_setting.fb2 = "mupdf"
+        G_reader_settings:saveSetting("provider", provider_setting)
+
+        local provider = DocumentRegistry:getProvider(path)
+
+        assert.is_equal("mupdf", provider.provider)
+
+        G_reader_settings:delSetting("provider")
+    end)
 end)