resolves asciidoctor#1414 allow theme to set base text decoration width

CHANGELOG.adoc

@@ -12,6 +12,7 @@ For a detailed view of what has changed, refer to the {uri-repo}/commits/master[
 * expose theme as property on converter
 * add support for unbreakable option on open blocks (#1407) *@mogztter*
 * don't add mailto: prefix to revealed mailto URI when hide-uri-scheme is set (#920)
+* allow theme to set base text decoration width (#1414)
 
 == 1.5.0.beta.8 (2019-11-23) - @mojavelinux
 

docs/theming-guide.adoc

@@ -1338,6 +1338,12 @@ NOTE: While it's common to define additional keys in this category (e.g., `base-
   line-height: >
     $base-line-height-length /
     $base-font-size
+
+|text-decoration-width
+|<<values,Number>> +
+(default: 1)
+|base:
+  text-decoration-width: 0.5
 |===
 
 . The `text-transform` key cannot be set globally.

lib/asciidoctor/pdf/converter.rb

@@ -46,6 +46,8 @@ class Converter < ::Prawn::Document
 
       attr_reader :theme
 
+      attr_reader :text_decoration_width
+
       # NOTE require_library doesn't support require_relative and we don't modify the load path for this gem
       CodeRayRequirePath = ::File.join __dir__, 'ext/prawn/coderay_encoder'
       RougeRequirePath = ::File.join __dir__, 'ext/rouge'
@@ -346,6 +348,7 @@ def init_pdf doc
         @page_bg_color = resolve_theme_color :page_background_color, 'FFFFFF'
         @root_font_size = theme.base_font_size || 12
         @font_color = theme.base_font_color || '000000'
+        @text_decoration_width = theme.base_text_decoration_width
         @base_align = (align = doc.attr 'text-align') && (TextAlignmentNames.include? align) ? align : theme.base_align
         @cjk_line_breaks = doc.attr? 'scripts', 'cjk'
         if (hyphen_lang = doc.attr 'hyphens') &&

lib/asciidoctor/pdf/ext/prawn/formatted_text/box.rb

@@ -4,7 +4,7 @@
   def draw_fragment_overlay_styles fragment
     if (underline = (styles = fragment.styles).include? :underline) || (styles.include? :strikethrough)
       (doc = fragment.document).save_graphics_state do
-        if (text_decoration_width = (fs = fragment.format_state)[:text_decoration_width])
+        if (text_decoration_width = (fs = fragment.format_state)[:text_decoration_width] || doc.text_decoration_width)
           doc.line_width = text_decoration_width
         end
         if (text_decoration_color = fs[:text_decoration_color])

spec/formatted_text_formatter_spec.rb

@@ -281,6 +281,19 @@
       (expect lines[1][:width]).to be 2
     end
 
+    it 'should allow theme to set base text decoration width' do
+      pdf_theme = {
+        base_text_decoration_width: 0.5,
+        role_underline_text_decoration_color: '0000AA',
+      }
+      input = '[.underline]#underline#'
+      pdf = to_pdf input, pdf_theme: pdf_theme, analyze: :line
+      lines = pdf.lines
+      (expect lines).to have_size 1
+      (expect lines[0][:color]).to eql '0000AA'
+      (expect lines[0][:width]).to eql 0.5
+    end
+
     it 'should support size roles (big and small) in default theme' do
       pdf_theme = build_pdf_theme
       (expect pdf_theme.role_big_font_size).to be 13