pdf support

6 files changed, 122 insertions, 2 deletions

diff --git a/Makefile b/Makefile
index 96e0fdf..f61c4c3 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,9 @@
 MAKEFLAGS += -j1
 
+pdfjs = https://github.com/mozilla/pdf.js/releases/download/v1.9.426/pdfjs-1.9.426-dist.zip
+
 # Default target
-all: out/index.html out/main.css
+all: out/index.html out/main.css out/pdfjs
 phony += all
 
 # Boilerplate
@@ -25,7 +27,13 @@ out/%.css: src/%.scss
 	@mkdir -p $(@D)
 	scss --stdin < $< > $@
 
-targets = $(phony) %.css
+out/$(notdir $(pdfjs)):
+	wget -c --no-use-server-timestamp -O $@ $(pdfjs)
+out/pdfjs: out/$(notdir $(pdfjs))
+	rm -rf -- $@
+	mkdir -- $@ && bsdtar -xf $(abspath $<) -C $@ --exclude '*.pdf' || { rm -rf -- $@; false; }
+
+targets = $(phony) %.css out/pdfjs%
 $(sort $(filter-out $(targets),out/index.html $(MAKECMDGOALS))): FORCE
 	./bin/sitegen
 
diff --git a/README.org b/README.org
index e8a3542..e95aff5 100644
--- a/README.org
+++ b/README.org
@@ -63,6 +63,7 @@ Currently supported formats are:
 
  - Markdown (~.md~) : converted with Pandoc
  - Org-mode (~.org~) : converted with Pandoc
+ - PDF (~.pdf~) : embedded with PDF.js
 
 I don't need to tell you how to make these types of files.
 
@@ -107,6 +108,21 @@ when converting to HTML.  See the Org-mode and Pandoc documentation.
 AFAIK, unfortunately Org-mode only has values as strings, no
 structured data.
 
+** Setting metadata: PDF
+
+PDF files natively support embedding certain bits of metadata.  The
+bits that we use are:
+
+ - title
+ - author
+ - creation date
+ - modification date
+
+If you need to set any other metadata attributes, or want to override
+the values in the PDF (since setting them can be difficult), create
+YAML file with the same name as the PDF file, but with the ~.yaml~
+file extension instead of ~.pdf~.
+
 ** Metadata attributes that are handles specially
 
 There are some metadata attributes that are used specially by the site
diff --git a/lib/page_local.rb b/lib/page_local.rb
index e956f6a..6c70ac3 100644
--- a/lib/page_local.rb
+++ b/lib/page_local.rb
@@ -16,6 +16,9 @@ class LocalPage < Page
 			return IndexPage::new(inpath)
 		when [".md", ".org"].include?(File::extname(inpath))
 			return LocalPage::new(inpath)
+		when ".pdf" == File::extname(inpath)
+			require 'page_pdf'
+			return PdfPage::new(inpath)
 		else
 			return nil
 		end
diff --git a/lib/page_pdf.rb b/lib/page_pdf.rb
new file mode 100644
index 0000000..e70c887
--- /dev/null
+++ b/lib/page_pdf.rb
@@ -0,0 +1,62 @@
+# coding: utf-8
+require 'erb'
+require 'open3'
+require 'yaml'
+
+require 'page_local'
+
+class PdfPage < LocalPage
+	def initialize(filename)
+		super(filename)
+	end
+
+	def pdf_metadata
+		if @metadata.nil?
+			stdout, stderr, status = Open3::capture3("pdfinfo", "--", local_infile)
+			unless stderr.empty?
+				raise stderr
+			end
+			unless status.success?
+				raise status
+			end
+			raw_metadata = stdout.split("\n").map{|l|l.split(":", 2).map{|c|c.strip}}.to_h
+
+			# Transform the PDF property names to match our metadata names
+			key_map = {
+				"Title" => "title",
+				"Author" => "author",
+				"CreationDate" => "published",
+				"ModDate" => "updated",
+				# "Keywords" => "categories",
+			}
+			@metadata = raw_metadata.map{|k,v|[key_map[k]||k,v]}.to_h
+
+			yamlfile = local_infile.sub(/\.pdf$/, '.yaml')
+			if File::exist?(yamlfile)
+				@metadata = @metadata.merge(YAML::load(File::read(yamlfile)))
+			end
+		end
+		@metadata
+	end
+	def pdf_js_url
+		@@pdjfs ||= Config::get.url + 'pdfjs/web/viewer.html'
+	end
+	def pdf_viewer_url
+		@viewer_url ||= pdf_js_url + ('?file=' + URI::encode_www_form_component(pdf_js_url.route_to(local_srcurl)))
+	end
+
+	def local_intype
+		return 'markdown'
+	end
+	def local_depends
+		if @depends.nil?
+			yamlfile = local_infile.sub(/\.pdf$/, '.yaml')
+			metafile = File::exist?(yamlfile) ? yamlfile : File::dirname(yamlfile)
+			tmplfile = "tmpl/pdf.md.erb"
+			@depends = super.map{|k,v|[k,v.merge([metafile, tmplfile])]}.to_h
+		end
+		@depends
+	end
+end
+
+ERB::new(File::read("tmpl/pdf.md.erb")).def_method(PdfPage, 'local_input()', "tmpl/pdf.md.erb")
diff --git a/src/main.scss b/src/main.scss
index be00d49..cdbc200 100644
--- a/src/main.scss
+++ b/src/main.scss
@@ -287,3 +287,29 @@ body.dnd {
 									   font-weight:bold; }
 	}
 }
+
+/* D&D-style pages ************************************************************/
+
+body.pdf {
+	position: absolute;
+	width: 100%;
+	height: 100%;
+	bottom: 0;
+
+	display: flex;
+	flex-direction: column;
+
+	article {
+		flex-grow: 2;
+		padding: 0;
+
+		h1 {
+			text-align: center;
+			margin: 0.25em 0;
+		}
+		iframe {
+			width: 100%;
+			height: 100%;
+		}
+	}
+}
diff --git a/tmpl/pdf.md.erb b/tmpl/pdf.md.erb
new file mode 100644
index 0000000..2ce7327
--- /dev/null
+++ b/tmpl/pdf.md.erb
@@ -0,0 +1,5 @@
+<%= pdf_metadata.to_yaml %>
+class: pdf
+---
+
+<iframe src="<%= url.route_to(pdf_viewer_url) %>" ></iframe>