[SPIKE] Investigate bibtex for citation

Gemfile

@@ -41,8 +41,11 @@ gem 'bootsnap', require: false
 
 # Additional gems
 gem 'action_policy'
+gem 'bibtex-ruby'
+gem 'citeproc-ruby'
 gem 'cocina-models'
 gem 'config'
+gem 'csl-styles'
 gem 'dor-services-client', '>= 15.2.1'
 gem 'dor-workflow-client', '>= 7.6.1'
 gem 'druid-tools'

Gemfile.lock

@@ -92,6 +92,9 @@ GEM
       erubi (~> 1.4)
       parser (>= 2.4)
       smart_properties
+    bibtex-ruby (6.1.0)
+      latex-decode (~> 0.0)
+      racc (~> 1.7)
     bigdecimal (3.1.8)
     bindex (0.8.1)
     bootsnap (1.18.4)
@@ -129,6 +132,12 @@ GEM
       regexp_parser (>= 1.5, < 3.0)
       xpath (~> 3.2)
     chronic (0.10.2)
+    citeproc (1.0.10)
+      namae (~> 1.0)
+    citeproc-ruby (2.1.0)
+      citeproc (~> 1.0, >= 1.0.9)
+      csl (~> 2.0)
+      observer (< 1.0)
     cocina-models (0.99.1)
       activesupport
       deprecation
@@ -155,6 +164,11 @@ GEM
       bigdecimal
       rexml
     crass (1.0.6)
+    csl (2.0.0)
+      namae (~> 1.0)
+      rexml
+    csl-styles (2.0.1)
+      csl (~> 2.0)
     cssbundling-rails (1.4.1)
       railties (>= 6.0.0)
     cyperful (0.2.0)
@@ -287,6 +301,7 @@ GEM
       kaminari-core (= 1.2.2)
     kaminari-core (1.2.2)
     language_server-protocol (3.17.0.3)
+    latex-decode (0.4.0)
     listen (3.9.0)
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
@@ -316,6 +331,8 @@ GEM
       turbo-rails
     msgpack (1.7.5)
     multi_json (1.15.0)
+    namae (1.2.0)
+      racc (~> 1.7)
     net-http (0.6.0)
       uri
     net-imap (0.5.1)
@@ -337,6 +354,7 @@ GEM
       racc (~> 1.4)
     nokogiri (1.17.2-x86_64-linux)
       racc (~> 1.4)
+    observer (0.1.2)
     okcomputer (1.18.5)
     openapi3_parser (0.10.0)
       commonmarker (>= 1.0)
@@ -552,12 +570,15 @@ PLATFORMS
 DEPENDENCIES
   action_policy
   bcrypt (~> 3.1.7)
+  bibtex-ruby
   bootsnap
   capistrano-passenger
   capistrano-rails
   capybara
+  citeproc-ruby
   cocina-models
   config
+  csl-styles
   cssbundling-rails
   cyperful
   debug

app/services/to_bib_tex/citation.rb

@@ -0,0 +1,79 @@
+# frozen_string_literal: true
+
+module ToBibTex
+  # Maps Cocina DRO to a BibTex object
+  class Citation
+    def self.call(...)
+      new(...).call
+    end
+
+    def initialize(cocina_object:)
+      @cocina_object = cocina_object
+      @bibliography = BibTeX::Bibliography.new
+      @cp = CiteProc::Processor.new style: 'apa', format: 'text'
+    end
+
+    def call
+      # work_type, work_subtypes = CocinaSupport.work_type_and_subtypes_for(cocina_object:)
+      bibliography << cocina_to_bibtex
+      debugger
+      cp.import bibliography.to_citeproc
+      cp.render :bibliography, id: druid_sym, format: :apa
+    end
+
+    private
+
+    attr_reader :cocina_object, :bibliography, :cp
+
+    def cocina_to_bibtex
+      BibTeX::Entry.new do |entry|
+        entry.type = :article
+        entry.key = druid_sym
+        entry.title = CocinaSupport.title_for(cocina_object:)
+        entry.author = person_authors_string
+        entry.organization = organization_authors_string
+        entry.year = CocinaSupport.event_date_for(cocina_object:, type: 'publication')[:year]
+        entry.keywords = CocinaSupport.keywords_for(cocina_object:).join(', ')
+        entry.publisher = "Stanford Digital Repository"
+        entry.howpublished = "\\url\{#{Settings.purl.url}/#{cocina_object.externalIdentifier}\}"
+      end
+    end
+
+    def druid_sym
+      cocina_object.externalIdentifier.split(':').last.to_sym
+    end
+
+    def person_authors_string
+      CocinaSupport.authors_for(cocina_object:).select do |author|
+        author['role_type'] == 'person'
+      end.map do |author| 
+        [author['last_name'], author['first_name']].join(', ')
+      end.join(' and ')
+    end
+
+    def organization_authors_string
+      CocinaSupport.authors_for(cocina_object:).select do |author|
+        author['role_type'] == 'organization'
+      end.map do |org|
+        org['organization_name']
+      end.join(' and ')
+    end
+  end
+end
+
+# BebTeX types:
+# article (Cocina: Text/Article)
+# book (Cocina: Text/Book)
+# booklet
+# conference (Cocina: Text/Conference session)
+# inbook (Cocina: Text/Book chapter)
+# incollection
+# inproceedings (Cocina: ???/Conference session)
+# manual (Cocina: Documentation)
+# mastersthesis (Cocina: Thesis)
+# misc
+# phdthesis
+# proceedings
+# techreport (Cocina: Technical report)
+# unpublished (Cocina: Working paper)
+

spec/services/to_bib_tex/citation_spec.rb

@@ -0,0 +1,14 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe ToBibTex::Citation, type: :mapping do
+  subject(:bibtex) { described_class.call(cocina_object:) }
+
+  let(:cocina_object) { dro_with_metadata_fixture }
+  let(:citation) { 'My title. (2024).' }
+
+  it 'maps to BibTex' do
+    expect(bibtex.first.to_s).to equal(citation)
+  end
+end