Class: Presentation

Inherits:
Object
  • Object
show all
Defined in:
lib/md2slides/audio.rb,
lib/md2slides/video.rb,
lib/md2slides/presentation.rb,
lib/md2slides/text_to_speech.rb

Constant Summary collapse

AUDIO_RATE =

XXX: Google Text to Speech produces at this rate…

24000
VIDEO_FRAME_RATE = 
1
VIDEO_ONLY_DURATION = 
4
APPLICATION_NAME = 
'md2slides'
GOOGLE_OAUTH_SCOPE = 
[
	"https://www.googleapis.com/auth/drive",
#		"https://www.googleapis.com/auth/userinfo.email",
#		"https://www.googleapis.com/auth/userinfo.profile",
	"https://www.googleapis.com/auth/presentations",
]

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(md = nil) ⇒ Presentation

Returns a new instance of Presentation.



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# File 'lib/md2slides/presentation.rb', line 22

def initialize(md = nil)
	@md = md
	url = md&.attributes[:url]
	if url =~ %r{https://docs.google.com/presentation/d/([^\/ ]+).*$}
		@id = $1
	elsif url
		raise("ERROR: invalid URL: #{url}")
	end

	@authorizer = Google::Auth::ServiceAccountCredentials.make_creds(
		json_key_io: File.open(ENV['GOOGLE_APPLICATION_CREDENTIALS']),
		scope: GOOGLE_OAUTH_SCOPE)

	@slides_service = Google::Apis::SlidesV1::SlidesService.new
	@slides_service.client_options.application_name = APPLICATION_NAME
	@slides_service.authorization = @authorizer

	@drive_service = Google::Apis::DriveV3::DriveService.new
	@drive_service.client_options.application_name = APPLICATION_NAME
	@drive_service.authorization = @authorizer

	@requests = []

	# XXX: this seript always runs by an API user...
	#people_service = Google::Apis::PeopleV1::PeopleServiceService.new
	#people_service.authorization = @authorizer
	#profile = people_service.get_person("people/me", person_fields: "names,emailAddresses")
	#name = profile.names.first.display_name
	#email = profile.email_addresses.first.value
	#puts "#{name}: #{email}"
end

Instance Attribute Details

#id ⇒ Object (readonly)

Returns the value of attribute id.



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# File 'lib/md2slides/presentation.rb', line 16

def id
  @id
end

Class Method Details

.filename_sanitize(s) ⇒ Object 



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# File 'lib/md2slides/presentation.rb', line 18

def self.filename_sanitize(s)
	s&.gsub(/[\/\\:\*\?"<>\|]/, '')
end

.text_to_speech(text, filename) ⇒ Object 



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# File 'lib/md2slides/text_to_speech.rb', line 8

def self.text_to_speech(text, filename)
	extname = File.extname(filename)
	if extname
		if filename =~ /^(.*)#{extname}$/
			filename = $1
		else
			raise("invalid extname #{extname} in \"#{filename}\"")
		end
	end
	filename += '.mp3'

	text.strip!
	if text !~ /^<speak>/
		text = "<speak>#{text}</speak>"
	end

	response = Google::Cloud::TextToSpeech.new.synthesize_speech(
	    # XXX: I don't know how to create an object of Google::Cloud::TextToSpeech::SynthesisInput...
	    { ssml: text },
	    #
	    # Standard is the cheapest.
	    #	ja-JP-Standard-A, B female
	    #	ja-JP-Standard-C, D male
	    # Wavenet is more expensive than standard.
	    #	https://cloud.google.com/text-to-speech/docs/voices?hl=ja
	    #	https://cloud.google.com/text-to-speech/pricing?hl=ja
	    #
	    #{ language_code: 'ja-JP', name: 'ja-JP-Wavenet-B' },
	    { language_code: 'ja-JP', name: 'ja-JP-Standard-D' },
	    { audio_encoding: :MP3 },
	    )

	File.open(filename, 'wb') do |file|
		file.write(response.audio_content)
	end

	return filename
end

Instance Method Details

#__data_path(basedir) ⇒ Object 



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# File 'lib/md2slides/presentation.rb', line 366

def __data_path(basedir)
	basedir = '.' if basedir.nil?
	if @md
		title = @md.first.title
		subtitle = @md.first.subtitle
	elsif @presentation
		title, subtitle = get_title
	end
	title = self.class.filename_sanitize(title)
	subtitle = self.class.filename_sanitize(subtitle)
	File.join(basedir, "#{title}-#{subtitle}-#{@id}")
end

#__data_slide_path(i, ext, basedir = nil) ⇒ Object 



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# File 'lib/md2slides/presentation.rb', line 379

def __data_slide_path(i, ext, basedir = nil)
	path = "slide-#{i}#{ext}"
	if basedir
		path = File.join(basedir, path)
	end
	path
end

#__get_element_text(element) ⇒ Object 



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# File 'lib/md2slides/presentation.rb', line 242

def __get_element_text(element)
	element&.shape&.text&.text_elements&.collect { |e| e.text_run&.content&.strip }&.compact&.join("\n")
end

#__get_presentation ⇒ Object 



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# File 'lib/md2slides/presentation.rb', line 54

def __get_presentation
	begin
		@authorizer.fetch_access_token!
		@presentation = @slides_service.get_presentation(@id)
	rescue => e
		require 'webrick'
		raise(e, "#{e.message} (#{e.status_code} " +
		    "#{WEBrick::HTTPStatus.reason_phrase(e.status_code)})\n" +
		    "#{e.full_message}")
	end
end

#__request ⇒ Object 



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# File 'lib/md2slides/presentation.rb', line 150

def __request
	return if @requests.empty?
	batch_update_request = Google::Apis::SlidesV1::BatchUpdatePresentationRequest.new(requests: @requests)
	begin
		@slides_service.batch_update_presentation(@id, batch_update_request)
		@requests = []
	rescue => e
		raise(e, "#{e.body}\n#{e.full_message}")
	end
	@presentation = @slides_service.get_presentation(@id)
end

#clear ⇒ Object 



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# File 'lib/md2slides/presentation.rb', line 299

def clear
	existence_check
	n = @presentation.slides&.size.to_i
	while n > 0
		n -= 1
		delete_object(@presentation.slides[n].object_id_prop)
	end
	__request
end

#create(name) ⇒ Object 



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# File 'lib/md2slides/presentation.rb', line 119

def create(name)
	if exists?
		raise("already presentation exists!!")
	end
	presentation0 = Google::Apis::SlidesV1::Presentation.new(title: name)
	@presentation = @slides_service.create_presentation(presentation0)
	@id = @presentation.presentation_id
	puts "Create presentation #{name}: #{url}"
end

#create_slide(layout = 'TITLE_AND_BODY', insertion_index = nil) ⇒ Object 



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# File 'lib/md2slides/presentation.rb', line 170

def create_slide(layout = 'TITLE_AND_BODY', insertion_index = nil)
	insertion_index ||= @presentation.slides&.size.to_i	# at the tail
	#
	# layout can be:
	# https://developers.google.com/apps-script/reference/slides/predefined-layout
	#
	@requests.push({
		create_slide: {
			#
			# XXX: object ID should be specified for performance...
			#
#				object_id_prop: object_id_prop,
			insertion_index: insertion_index,
			slide_layout_reference: {
				predefined_layout: layout,
			}
		}
	})
	__request
	@presentation.slides[insertion_index]
end

#delete ⇒ Object 



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# File 'lib/md2slides/presentation.rb', line 129

def delete
	existence_check
	begin
		@drive_service.delete_file(@id)
		@presentation = nil
		puts "deleted ID: #{@id}"
	rescue Google::Apis::ClientError => e
		puts "ERROR: failed deleting #{@id}: #{e.full_message}"
	end
end

#delete_object(object_id) ⇒ Object 



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# File 'lib/md2slides/presentation.rb', line 162

def delete_object(object_id)
	@requests.push({
		delete_object: {
			object_id_prop: object_id,
		}
	})
end

#delete_text(element) ⇒ Object 



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# File 'lib/md2slides/presentation.rb', line 192

def delete_text(element)
	return if ! element.shape.instance_variable_defined?(:@placeholder)
	return if ! element.shape.instance_variable_defined?(:@text)
	@requests.push({
		delete_text: {
			object_id_prop: element.object_id_prop,
			text_range: {
				type: 'ALL'
			}
		}
	})
end

#download(dir = nil) ⇒ Object 



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# File 'lib/md2slides/presentation.rb', line 421

def download(dir = nil)
	existence_check
	dir = __data_path(dir)
	parent = File.dirname(dir)
	files = Dir.glob("#{File.join(parent, "*#{@id}*")}")
	if files.empty?
		FileUtils.mkdir_p(dir)
	elsif files[0] != dir
		File.rename(files[0], dir)
	end
	lockfile = File.join(dir, '.lock')
	File.open(lockfile, File::RDWR|File::CREAT, 0644) do |f|
		f.flock(File::LOCK_EX | File::LOCK_NB)
		@presentation.slides.each_with_index do |slide, i|
			download_slide(i + 1, slide, dir)
		end
	end
end

#download_slide(i, slide, dir) ⇒ Object 



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# File 'lib/md2slides/presentation.rb', line 404

def download_slide(i, slide, dir)
	print "slide #{i}: downloading..."
	#
	# a size of a width can be: SMALL (200), MEDIUM (800), LARGE (1600)
	# https://developers.google.com/workspace/slides/api/reference/rest/v1/presentations.pages/getThumbnail
	#
	thumbnail = @slides_service.get_presentation_page_thumbnail(
	    @id, slide.object_id_prop, thumbnail_properties_thumbnail_size: 'LARGE')
	URI.open(thumbnail.content_url) do |remote_file|
		path = __data_slide_path(i, '.png', dir)
		File.open(path, 'wb') do |file|
			file.write(remote_file.read)
		end
	end
	puts 'done'
end

#download_slide0(i, slide, dir) ⇒ Object

XXX: these do not work when the presentation is not shared globally.



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# File 'lib/md2slides/presentation.rb', line 394

def download_slide0(i, slide, dir)
	url = export_url(i)
	URI.open(url) do |remote_file|
		path = __data_slide_path(i, '.png', dir)
		File.open(path, 'wb') do |file|
			file.write(remote_file.read)
		end
	end
end

#existence_check ⇒ Object 



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# File 'lib/md2slides/presentation.rb', line 74

def existence_check
	if ! exists?
		raise("presentation (ID: #{@id}) does not exists!!!")
	end
end

#exists? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/md2slides/presentation.rb', line 66

def exists?
	return false if ! @id
	if @presentation.nil?
		__get_presentation
	end
	!! @presentation
end

#export_url(i) ⇒ Object

XXX: these do not work when the presentation is not shared globally.



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# File 'lib/md2slides/presentation.rb', line 388

def export_url(i)
	#@id && "https://docs.google.com/presentation/d/#{@id}/export/png?id=#{@id}&pageid=#{slide.object_id_prop}&width=1920&height=1080"
	@id && "https://docs.google.com/presentation/d/#{@id}/export/png?id=#{@id}&pageid=p#{i}&width=1920&height=1080"
end

#extent ⇒ Object 



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# File 'lib/md2slides/presentation.rb', line 84

def extent
	existence_check
	width = @presentation.page_size.width.magnitude
	height = @presentation.page_size.height.magnitude
	unit = @presentation.page_size.width.unit
	return width, height, unit
end

#find_element(slide, type) ⇒ Object 



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# File 'lib/md2slides/presentation.rb', line 230

def find_element(slide, type)
	slide&.page_elements&.find do |e|
		case e.shape&.placeholder&.type
		when type
			true
#			else
#				p e.shape&.placeholder&.type
#				false
		end
	end
end

#generate_audio(dir = nil) ⇒ Object 



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# File 'lib/md2slides/audio.rb', line 45

def generate_audio(dir = nil)
	dir = __data_path(dir)
	if @md
		@md.each_with_index do |page, i|
			generate_audio0(i + 1, page.comments, dir)
		end
	else
		@presentation.slides.each_with_index do |slide, i|
			generate_audio0(i + 1, get_slide_note(slide), dir)
		end
	end
end

#generate_audio0(i, notes, dir) ⇒ Object 



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# File 'lib/md2slides/audio.rb', line 5

def generate_audio0(i, notes, dir)
	print "slide \##{i}: generating audio... "
	path = __data_slide_path(i, '.m4a', dir)
	if notes
		opath = __data_slide_path(i, '.mp3', dir)
		opath = Presentation::text_to_speech(notes, opath)
		#
		# convert to .m4a, which contains duration in meta data.
		# this prevents unreasonable audio duration when combining
		# audio and video.
		#
		heading_silence = 2
		trailing_silence = 1
		cmd = <<~CMD
			ffmpeg -hide_banner -y				\
			    -f lavfi -t #{heading_silence}		\
			    -i anullsrc=r=#{AUDIO_RATE}:cl=mono		\
			    -i #{opath}					\
			    -f lavfi -t #{trailing_silence}		\
			    -i anullsrc=r=#{AUDIO_RATE}:cl=mono		\
			    -filter_complex "[0:a][1:a][2:a]concat=n=3:v=0:a=1[out]"	\
			    -map "[out]"				\
			    -c:a aac -b:a 64k #{path}
		CMD
		msg, errmsg, status = Open3.capture3(cmd)
		File.delete(opath) rescue
		if ! status.success?
			raise("ERROR: cannot convert audio: #{errmsg}")
		end
		puts 'done'
	else
		begin
			File.delete(path)
		rescue Errno::ENOENT => e
			# okay
		end
		puts "skip (no notes)"
	end
end

#generate_slide_video(i, dir) ⇒ Object 



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# File 'lib/md2slides/video.rb', line 7

def generate_slide_video(i, dir)
	img = __data_slide_path(i, '.png', dir)
	audio = __data_slide_path(i, '.m4a', dir)
	video = __data_slide_path(i, '.mp4', dir)

	if File.exists?(audio)
		audioin = "-i \"#{audio}\""
		timeopt = '-shortest'
	else
		audioin = "-f lavfi -i aevalsrc=0"
		timeopt = "-vframes #{VIDEO_FRAME_RATE * VIDEO_ONLY_DURATION}"
	end
	cmd = <<~CMD
		ffmpeg -hide_banner -y				\
		    -framerate #{VIDEO_FRAME_RATE} -loop 1 -i "#{img}" \
		    #{audioin} -map 0:v:0 -map 1:a:0		\
		    -c:v libx264 -tune stillimage		\
		    -c:a aac -ar #{AUDIO_RATE} -ac 1		\
		    -pix_fmt yuv420p #{timeopt} "#{video}"
	CMD
	msg, errmsg, status = Open3.capture3(cmd)
	if ! status.success?
		raise("ERROR: cannot produce video: #{errmsg}")
	end
end

#generate_video(dir = nil) ⇒ Object 



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# File 'lib/md2slides/video.rb', line 33

def generate_video(dir = nil)
	dir = __data_path(dir)
	pages = @md&.size || @presentation&.slides&.size.to_i
	for i in 1..pages
		print "slide \##{i}: generating video..."
		generate_slide_video(i, dir)
		puts "done"
	end

	print "concatenate video files..."
	videolist = 'video-list.txt'
	File.open(File.join(dir, videolist), 'w') do |f|
		for i in 1..pages
			f.puts("file #{__data_slide_path(i, '.mp4')}")
		end
	end
	video = 'video.mp4'
	cmd = <<~CMD
		cd "#{dir}" &&					\
		    ffmpeg -hide_banner -y -f concat -safe 0	\
		    -i "#{videolist}" -c copy "#{video}"
	CMD
	msg, errmsg, status = Open3.capture3(cmd)
	if ! status.success?
		raise("ERROR: cannot produce video: #{errmsg}")
	else
		puts 'done'
	end
end

#get_slide_note(slide) ⇒ Object 



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# File 'lib/md2slides/presentation.rb', line 285

def get_slide_note(slide)
	notes = slide.slide_properties.notes_page
	__get_element_text(find_element(notes, 'BODY'))
end

#get_slide_text(slide, re = 'BODY') ⇒ Object 



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# File 'lib/md2slides/presentation.rb', line 246

def get_slide_text(slide, re = 'BODY')
	__get_element_text(find_element(slide, re))
end

#get_title ⇒ Object 



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# File 'lib/md2slides/presentation.rb', line 250

def get_title
	slide = @presentation&.slides.first
	title = get_slide_text(slide, /(^TITLE|[^a-zA-Z]TITLE)$/)
	subtitle = get_slide_text(slide, 'SUBTITLE')
	return title, subtitle
end

#height ⇒ Object 



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# File 'lib/md2slides/presentation.rb', line 96

def height
	extent[1]
end

#list ⇒ Object 



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# File 'lib/md2slides/presentation.rb', line 309

def list
	existence_check
	puts "title: #{@presentation.title}"
	puts "pages: #{@presentation.slides.size}"
	@presentation.slides.each_with_index do |slide, i|
		puts "- slide \##{i + 1} contains #{slide.page_elements.count} elements."
	end
end

#list_all ⇒ Object 



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# File 'lib/md2slides/presentation.rb', line 318

def list_all
	query = "mimeType = 'application/vnd.google-apps.presentation' and trashed = false"
	response = @drive_service.list_files(q: query, fields: 'files(id, name)', page_size: 100)
	response.files.each do |file|
		puts "#{file.name}: #{file.id}"
	end
end

#set_bullet(element, bullet) ⇒ Object 



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# File 'lib/md2slides/presentation.rb', line 217

def set_bullet(element, bullet)
	return if bullet.nil?
	@requests.push({
		create_paragraph_bullets: {
			object_id_prop: element.object_id_prop,
			text_range: {
				type: 'ALL',
			},
			bullet_preset: bullet,
		}
	})
end

#set_slide_note(slide, text) ⇒ Object 



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# File 'lib/md2slides/presentation.rb', line 290

def set_slide_note(slide, text)
	notes = slide.slide_properties.notes_page
	element = find_element(notes, 'BODY')
	if element.nil?
		raise("ERROR: no text box element found in notes!!!")
	end
	update_text(element, text)
end

#set_slide_subtitle(slide, title) ⇒ Object 



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# File 'lib/md2slides/presentation.rb', line 270

def set_slide_subtitle(slide, title)
	set_slide_title(slide, title, 'SUBTITLE')
end

#set_slide_text(slide, text, re = 'BODY', bullet = 'BULLET_DISC_CIRCLE_SQUARE') ⇒ Object 



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# File 'lib/md2slides/presentation.rb', line 257

def set_slide_text(slide, text, re = 'BODY', bullet = 'BULLET_DISC_CIRCLE_SQUARE')
	element = find_element(slide, re)
	if element.nil?
		raise("ERROR: no text element found!!!")
	end
	update_text(element, text)
	set_bullet(element, bullet)
end

#set_slide_title(slide, title, re = /(^TITLE|[^a-zA-Z]TITLE)$/) ⇒ Object 



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# File 'lib/md2slides/presentation.rb', line 266

def set_slide_title(slide, title, re = /(^TITLE|[^a-zA-Z]TITLE)$/)
	set_slide_text(slide, title, re, nil)
end

#set_title(title, subtitle = nil) ⇒ Object 



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# File 'lib/md2slides/presentation.rb', line 274

def set_title(title, subtitle = nil)
	existence_check
	if @presentation&.slides&.size.to_i == 0
		create_slide('TITLE')
	end
	slide = @presentation.slides.first
	set_slide_title(slide, title)
	set_slide_subtitle(slide, subtitle)
	__request
end

#share(user) ⇒ Object 



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# File 'lib/md2slides/presentation.rb', line 140

def share(user)
	existence_check
	permission = Google::Apis::DriveV3::Permission.new(
	    type: 'user',
	    role: 'writer', # 'reader', 'commenter', 'writer'
	    email_address: user
	    )
	@drive_service.create_permission(@id, permission, fields: "id")
end

#stick_out_check ⇒ Object 



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# File 'lib/md2slides/presentation.rb', line 100

def stick_out_check
	msgs = []
	@presentation.slides.each_with_index do |slide, i|
		slide.page_elements.each do |element|
			next unless element.shape
			next unless element.transform
			x1 = element.transform.translate_x || 0
			x2 = x1 + element.size.width.magnitude rescue 0
			y1 = element.transform.translate_y || 0
			y2 = y1 + element.size.width.magnitude rescue 0
			puts "width: #{width}, height: #{height}"
			if x2 > width || y2 > height || x1 < 0 || y1 < 0
				msgs.push("slide #{i + 1}: sticking out: (#{x1},#{y1})-(#{x2},#{y2})")
			end
		end
	end
	raise(msgs.join("\n")) unless msgs.empty?
end

#update ⇒ Object 



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# File 'lib/md2slides/presentation.rb', line 326

def update
	#
	# XXX: currently, clear all slides...
	#
	if exists?
		clear
	end
	@md.each do |page|
		if page.title_subtitle_only?
			layout = 'TITLE'
		elsif page.title_only?
			layout = 'SECTION_HEADER'
		else
			layout = 'TITLE_AND_BODY'
		end
		slide = create_slide(layout)
		if page.has_title?
			set_slide_title(slide, page.title)
		end
		if page.title_subtitle_only?
			set_slide_subtitle(slide, page.subtitle)
		else
			texts = page.map do |e|
				# calculate the indentation.
				n = (e.attributes&.[](:indent).to_i / 2).to_i
				"\t" * n + e.value
			end.join("\n")
			if texts.size > 0
				set_slide_text(slide, texts)
				# set_slide_text(slide, texts,
				#    'BODY', 'NUMBERED_DIGIT_ALPHA_ROMAN')
			end
		end
		if page.has_comments?
			set_slide_note(slide, page.comments)
		end
	end
	__request
end

#update_text(element, text) ⇒ Object 



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# File 'lib/md2slides/presentation.rb', line 205

def update_text(element, text)
	delete_text(element)
	return if text.nil? || text.empty?
	@requests.push({
		insert_text: {
			object_id_prop: element.object_id_prop,
			insertion_index: 0,
			text: text
		}
	})
end

#url ⇒ Object 



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# File 'lib/md2slides/presentation.rb', line 80

def url
	@id && "https://docs.google.com/presentation/d/#{@id}/edit"
end

#width ⇒ Object 



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# File 'lib/md2slides/presentation.rb', line 92

def width
	extent[0]
end