X-Git-Url: https://git.draconx.ca/gitweb/homepage.git/blobdiff_plain/79dfd09162d1c4e201eccec188057c0e9ded2260..HEAD:/lib/helpers.rb

diff --git a/lib/helpers.rb b/lib/helpers.rb
index c9a1cc3..24d37e4 100644
--- a/lib/helpers.rb
+++ b/lib/helpers.rb
@@ -1,6 +1,6 @@
 # Nick's web site: Ruby helpers for processing
 #
-# Copyright © 2018-2021 Nick Bowler
+# Copyright © 2018-2022 Nick Bowler
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -16,9 +16,11 @@
 # along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
 require 'nokogiri'
+require 'fastimage'
 
-use_helper Nanoc::Helpers::Breadcrumbs
 use_helper Nanoc::Helpers::Blogging
+use_helper Nanoc::Helpers::Breadcrumbs
+use_helper Nanoc::Helpers::Rendering
 
 Xmlns = {
     'xhtml' => 'http://www.w3.org/1999/xhtml'
@@ -75,6 +77,95 @@ def counter(name = :default, item = @item)
     name.to_s.capitalize + " " + ($counters[item][name] += 1).to_s
 end
 
+# Return a hash containing :src, :width and :height based on an image item rep.
+def img_rep_attrs(item, rep)
+    rep = :large if item.reps[rep].raw_path.nil?
+    attrs = {}
+
+    attrs[:src] ||= item_uri(item, rep: rep)
+    attrs[:width], attrs[:height] = FastImage.size(item.reps[rep].raw_path)
+
+    return attrs
+end
+
+def embed_img(item, rep: :large, caption: nil, block_attrs: {}, img_attrs: {})
+    return "[image not found]" unless item
+
+    img_attrs[:alt] ||= item[:title]
+    caption ||= img_attrs[:alt]
+    caption = caption.strip
+    caption.gsub!(/\s+/, " ")
+
+    img_attrs = img_rep_attrs(item, rep).merge(img_attrs)
+    block_attrs[:href] = item_uri(item, rep: :info)
+
+    b = Nokogiri::XML::Builder.new do |xml|
+        xml.a(block_attrs) {
+            xml.img(img_attrs)
+            unless caption.empty?
+                xml << " &#x2060;"
+                xml.small { xml << caption }
+            end
+        }
+    end
+    b.to_xml(:save_with => Nokogiri::XML::Node::SaveOptions::NO_DECLARATION)
+end
+
+def gallery_img(item, rep: :medium, caption: nil, alt: nil)
+    attrs = { alt: alt, "generate-gallery" => "generate-gallery" }
+    embed_img(item, rep: rep, caption: caption, img_attrs: attrs)
+end
+
+def floating_img(item, rep: :medium, caption: nil, alt: nil, left: nil)
+    battrs = { class: if left then "left" else "right" end }
+    attrs = { alt: alt }
+
+    embed_img(item, rep: rep, caption: caption,
+                    block_attrs: battrs, img_attrs: attrs)
+end
+
+def expand_copyright(copyright)
+    result = { :years => {} }
+
+    /^([-–[:digit:][:space:],]*)(.*)$/.match(copyright) do |m|
+        m[1].split(/\s*,\s*/).each do |range|
+            lo, hi = range.split(/[^[:digit:]]+/)
+            for y in (lo..hi||lo)
+                result[:years][y] = 1
+            end
+        end
+
+        result[:years] = result[:years].keys.sort
+        result[:name] = m[2]
+        return result
+    end
+
+    return nil
+end
+
+def path_to_rep(path)
+    @items.find_all(File::dirname(path) + "/*").each do |item|
+        item.reps.each do |rep|
+            return rep if rep.path == path
+        end
+    end
+    return nil
+end
+
+def find_images(item = @item)
+    return [] if item.binary?
+
+    result = {}
+    doc = Nokogiri::HTML(item.compiled_content(snapshot: :pre))
+    doc.xpath("//img/@src").each do |imgsrc|
+        rep = path_to_rep(imgsrc.value)
+        if rep
+            result[rep.item.identifier] ||= rep.item
+        end
+    end
+    return result.values
+end
+
 def human_filesize(size)
     units = ["B", "KiB", "MiB", "GiB"]
     prec = 0
@@ -90,3 +181,7 @@ def human_filesize(size)
 
     sprintf("%.*f %s", prec, size + 0.05, unit)
 end
+
+def license_shortname(item)
+    item.fetch(:shortname, File::basename(item.identifier.without_ext).upcase)
+end