Add the ability to change slide symbols displayed in terminal output

lib/slideck/converter.rb

@@ -28,14 +28,17 @@ def initialize(markdown_parser, color: nil)
     #
     # @param [String] content
     #   the content to convert
+    # @param [Hash{Symbol => String}, Symbol] symbols
+    #   the converted content symbols
     # @param [Integer] width
     #   the slide width
     #
     # @return [String]
     #
     # @api public
-    def convert(content, width: nil)
-      @markdown_parser.parse(content, color: @color, width: width)
+    def convert(content, symbols: nil, width: nil)
+      @markdown_parser.parse(
+        content, color: @color, symbols: symbols, width: width)
     end
   end # Converter
 end # Slideck

lib/slideck/metadata.rb

@@ -77,6 +77,11 @@ def self.define_meta(key)
     # @return [Hash{Symbol => Slideck::Alignment,String}]
     define_meta :pager
 
+    # The symbols configuration
+    #
+    # @return [Hash{Symbol => String}, Symbol]
+    define_meta :symbols
+
     # Create a Metadata instance
     #
     # @param [Hash{Symbol => Object}] metadata

lib/slideck/metadata_converter.rb

@@ -47,7 +47,7 @@ def convert(custom_metadata)
     # @param [Object] value
     #   the metadata value
     #
-    # @return [Hash, Slideck::Alignment, Slideck::Margin]
+    # @return [Hash, Slideck::Alignment, Slideck::Margin, Symbol]
     #
     # @api private
     def convert_for(key, value)
@@ -58,6 +58,8 @@ def convert_for(key, value)
         @margin.from(value)
       when :footer, :pager
         convert_align_key(wrap_with_text_key(value), "bottom")
+      else
+        value
       end
     end
 

lib/slideck/metadata_defaults.rb

@@ -51,7 +51,8 @@ def create_defaults
         align: @alignment["left", "top"],
         footer: default_footer,
         margin: @margin[0, 0, 0, 0],
-        pager: default_pager
+        pager: default_pager,
+        symbols: :unicode
       }.freeze
     end
 

lib/slideck/renderer.rb

@@ -87,9 +87,9 @@ def clear
     #
     # @api private
     def render_content(slide)
-      alignment = slide[:metadata].align || @metadata.align
-      margin = slide[:metadata].margin || @metadata.margin
-      converted = convert_markdown(slide[:content], margin)
+      alignment, margin, symbols =
+        *select_metadata(slide[:metadata], :align, :margin, :symbols)
+      converted = convert_markdown(slide[:content], margin, symbols)
 
       render_section(converted.lines, alignment, margin)
     end
@@ -103,13 +103,12 @@ def render_content(slide)
     #
     # @api private
     def render_footer(slide_metadata)
-      footer_metadata = slide_metadata && slide_metadata.footer
-      footer_metadata ||= @metadata.footer
+      footer_metadata = pick_metadata(slide_metadata, :footer)
       return if (text = footer_metadata[:text]).empty?
 
       alignment = footer_metadata[:align] || @metadata.footer[:align]
-      margin = slide_margin(slide_metadata)
-      converted = convert_markdown(text, margin).chomp
+      margin, symbols = *select_metadata(slide_metadata, :margin, :symbols)
+      converted = convert_markdown(text, margin, symbols).chomp
 
       render_section(converted.lines, alignment, margin)
     end
@@ -127,29 +126,46 @@ def render_footer(slide_metadata)
     #
     # @api private
     def render_pager(slide_metadata, current_num, num_of_slides)
-      pager_metadata = slide_metadata && slide_metadata.pager
-      pager_metadata ||= @metadata.pager
+      pager_metadata = pick_metadata(slide_metadata, :pager)
       return if (text = pager_metadata[:text]).empty?
 
       alignment = pager_metadata[:align] || @metadata.pager[:align]
-      margin = slide_margin(slide_metadata)
+      margin, symbols = *select_metadata(slide_metadata, :margin, :symbols)
       formatted_text = format(text, page: current_num, total: num_of_slides)
-      converted = convert_markdown(formatted_text, margin).chomp
+      converted = convert_markdown(formatted_text, margin, symbols).chomp
 
       render_section(converted.lines, alignment, margin)
     end
 
-    # Select slide margin from metadata
+    # Select configuration(s) matching name(s) from metadata
     #
     # @param [Slideck::Metadata] slide_metadata
     #   the slide metadata
+    # @param [Arra<Symbol>] names
+    #   the configuration name(s)
     #
-    # @return [Slideck::Margin]
+    # @return [Object]
     #
     # @api private
-    def slide_margin(slide_metadata)
-      slide_margin = slide_metadata && slide_metadata.margin
-      slide_margin || @metadata.margin
+    def select_metadata(slide_metadata, *names)
+      names.each_with_object([]) do |name, selected|
+        selected << pick_metadata(slide_metadata, name)
+      end
+    end
+
+    # Pick configuration by name from metadata
+    #
+    # @param [Slideck::Metadata] slide_metadata
+    #   the slide metadata
+    # @param [Symbol] name
+    #   the configuration name
+    #
+    # @return [Object]
+    #
+    # @api private
+    def pick_metadata(slide_metadata, name)
+      metadata_item = slide_metadata && slide_metadata.send(name)
+      metadata_item || @metadata.send(name)
     end
 
     # Render section with aligned lines
@@ -226,12 +242,14 @@ def find_top_row(alignment, margin, num_of_lines)
     #   the content to convert to terminal output
     # @param [Slideck::Margin] margin
     #   the slide margin
+    # @param [Hash{Symbol => String}, Symbol] symbols
+    #   the converted content symbols
     #
     # @return [String]
     #
     # @api private
-    def convert_markdown(content, margin)
-      @converter.convert(content, width: slide_width(margin))
+    def convert_markdown(content, margin, symbols)
+      @converter.convert(content, symbols: symbols, width: slide_width(margin))
     end
 
     # Find maximum line length

spec/unit/converter_spec.rb

@@ -40,4 +40,12 @@
       "Title\n"
     ].join)
   end
+
+  it "converts a markdown list to terminal output with ascii symbols" do
+    converter = described_class.new(markdown_parser, color: true)
+
+    converted = converter.convert("- list item", symbols: :ascii, width: 20)
+
+    expect(converted).to eq("\e[33m*\e[0m list item\n")
+  end
 end

spec/unit/metadata_converter_spec.rb

@@ -90,4 +90,16 @@
       }
     })
   end
+
+  it "leaves :symbols value unconverted" do
+    converter = described_class.new(alignment, margin)
+
+    converted = converter.convert({
+      symbols: {base: :ascii, override: {bullet: "x"}}
+    })
+
+    expect(converted).to eq({
+      symbols: {base: :ascii, override: {bullet: "x"}}
+    })
+  end
 end

spec/unit/metadata_defaults_spec.rb

@@ -19,7 +19,8 @@
       pager: {
         align: alignment["right", "bottom"],
         text: "%<page>d / %<total>d"
-      }
+      },
+      symbols: :unicode
     })
   end
 
@@ -33,7 +34,8 @@
       margin: margin[1, 2, 3, 4],
       pager: {
         text: "%<page>d of %<total>d"
-      }
+      },
+      symbols: :ascii
     })
 
     expect(merged).to eq({
@@ -46,7 +48,8 @@
       pager: {
         align: alignment["right", "bottom"],
         text: "%<page>d of %<total>d"
-      }
+      },
+      symbols: :ascii
     })
   end
 
@@ -61,7 +64,8 @@
       margin: margin[1, 2, 3, 4],
       pager: {
         align: alignment["right", "top"]
-      }
+      },
+      symbols: :ascii
     })
 
     expect(merged).to eq({
@@ -74,7 +78,8 @@
       pager: {
         align: alignment["right", "top"],
         text: "%<page>d / %<total>d"
-      }
+      },
+      symbols: :ascii
     })
   end
 end

spec/unit/metadata_spec.rb

@@ -230,13 +230,28 @@
     expect(metadata.pager?).to eq(true)
   end
 
+  it "defaults :symbols to :unicode" do
+    metadata = described_class.from(converter, {}, defaults)
+
+    expect(metadata.symbols).to eq(:unicode)
+  end
+
+  it "creates metadata from :symbols with an :ascii value" do
+    config = {symbols: :ascii}
+
+    metadata = described_class.from(converter, config, defaults)
+
+    expect(metadata.symbols).to eq(:ascii)
+  end
+
   it "raises when invalid metadata key" do
     config = {invalid: ""}
 
     expect {
       described_class.from(converter, config, defaults)
     }.to raise_error(Slideck::InvalidMetadataKeyError,
                      "unknown 'invalid' configuration key\n" \
-                     "Available keys are: :align, :footer, :margin, :pager")
+                     "Available keys are: :align, :footer, :margin, " \
+                     ":pager, :symbols")
   end
 end

spec/unit/parser_spec.rb

@@ -79,6 +79,7 @@
     footer: footer content
     margin: 2
     pager: "page %<page>d of %<total>d"
+    symbols: :ascii
     EOS
     parser = described_class.new(StringScanner, metadata_parser)
 
@@ -89,7 +90,8 @@
         align: "center",
         footer: "footer content",
         margin: 2,
-        pager: "page %<page>d of %<total>d"
+        pager: "page %<page>d of %<total>d",
+        symbols: :ascii
       },
       slides: []
     })
@@ -101,6 +103,7 @@
       :footer: footer content
       :margin: 2
       :pager: "page %<page>d of %<total>d"
+      :symbols: :ascii
     EOS
     parser = described_class.new(StringScanner, metadata_parser)
 
@@ -111,7 +114,8 @@
         align: "center",
         footer: "footer content",
         margin: 2,
-        pager: "page %<page>d of %<total>d"
+        pager: "page %<page>d of %<total>d",
+        symbols: :ascii
       },
       slides: []
     })
@@ -123,6 +127,7 @@
     footer: footer content
     margin: [1, 2]
     pager: "page %<page>d of %<total>d"
+    symbols: :ascii
     ---
     # Slide 1
     ---
@@ -139,7 +144,8 @@
         align: "center",
         footer: "footer content",
         margin: [1, 2],
-        pager: "page %<page>d of %<total>d"
+        pager: "page %<page>d of %<total>d",
+        symbols: :ascii
       },
       slides: [
         {content: "# Slide 1", metadata: {}},
@@ -156,6 +162,7 @@
     footer: footer content
     margin: {top: 1, left: 2}
     pager: "page %<page>d of %<total>d"
+    symbols: :ascii
     ---
     # Slide 1
     ---
@@ -173,7 +180,8 @@
         align: "center",
         footer: "footer content",
         margin: {top: 1, left: 2},
-        pager: "page %<page>d of %<total>d"
+        pager: "page %<page>d of %<total>d",
+        symbols: :ascii
       },
       slides: [
         {content: "# Slide 1", metadata: {}},