From 23126bd14531c59e6a14e3c248a740d578a6a452 Mon Sep 17 00:00:00 2001
From: Charles Tapley Hoyt <cthoyt@gmail.com>
Date: Thu, 5 Sep 2024 12:28:13 +0200
Subject: [PATCH] Fix affiliation issue

---
 data/defaults/pdf.yaml                | 2 ++
 data/defaults/preprint.yaml           | 3 +++
 data/filters/prepare-affiliations.lua | 6 +++---
 example/paper.md                      | 2 +-
 4 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/data/defaults/pdf.yaml b/data/defaults/pdf.yaml
index 01b2096..58ac67a 100644
--- a/data/defaults/pdf.yaml
+++ b/data/defaults/pdf.yaml
@@ -11,6 +11,8 @@ filters:
     path: self-citation.lua
   - type: lua
     path: fix-bibentry-spacing.lua
+  - type: lua
+    path: prepare-affiliations.lua
 variables:
   # styling options
   colorlinks: true
diff --git a/data/defaults/preprint.yaml b/data/defaults/preprint.yaml
index be33e27..b789993 100644
--- a/data/defaults/preprint.yaml
+++ b/data/defaults/preprint.yaml
@@ -1,6 +1,9 @@
 to: latex
 output-file: paper.preprint.tex
 template: preprint.latex
+filters:
+  - type: lua
+    path: prepare-affiliations.lua
 variables:
   # styling options
   colorlinks: true
diff --git a/data/filters/prepare-affiliations.lua b/data/filters/prepare-affiliations.lua
index b7c8656..0ff678e 100644
--- a/data/filters/prepare-affiliations.lua
+++ b/data/filters/prepare-affiliations.lua
@@ -7,9 +7,9 @@ function Meta (meta)
   -- and meta.author (the processed one)
   for _, author in ipairs(meta.authors or {}) do
     local xml = "<affiliations>"
-    for i, affiliation_list in ipairs(author.affiliation) do
-        local index = tonumber(affiliation_list[1].text)
-        local affiliation = meta.affiliations[index]
+    for i, affiliation_index in ipairs(author.affiliation) do
+        affiliation_index = tonumber(pandoc.utils.stringify(affiliation_index))
+        local affiliation = meta.affiliations[affiliation_index]
         xml = xml.. "\n  <institution><institution_name>"
         for _, v in ipairs(affiliation.name) do
           if v.text then
diff --git a/example/paper.md b/example/paper.md
index 9bb0a33..1e37dc4 100644
--- a/example/paper.md
+++ b/example/paper.md
@@ -4,7 +4,7 @@ title: >-
 authors:
   - name: Albert Krewinkel
     email: albert@zeitkraut.de
-    affiliation: [1, 2, 4]
+    affiliation: "1, 2, 4"
     orcid: 0000-0002-9455-0796
     corresponding: true
   - name: Juanjo Bazán