25 files changed, 384 insertions, 11 deletions
diff --git a/ChangeLog.md b/ChangeLog.md
index 691474d..119cfa5 100644
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,5 +1,11 @@
 # ChangeLog
 
+## v0.0.8 - unreleased
+
+* [x] Towards localization support:
+  * [x] Detect the `lang` YAML parameters and use templates from
+        `{templates,structure}/{book,notes}/$lang`.
+
 ## v0.0.7 - 2024-06-09
 
 * [x] GitLab CI.
diff --git a/TODO.md b/TODO.md
index c5b5a87..1d51bd9 100644
--- a/TODO.md
+++ b/TODO.md
@@ -15,10 +15,10 @@
 
 ## Improvements
 
-* [ ] Localization support:
-  * [ ] By detecting the `lang` YAML parameters and using templates from
-        `templates/{book,notes}/$lang`.
-  * [ ] Setup a PO-file workflow for translating the templates.
+* [ ] Localization:
+  * [ ] Compile the `_output.yml` from a template, setting the `includes`
+        from the appropriate language-based structure files.
+  * [ ] Setup a PO-file workflow for translating the structure and templates?
 * [ ] Formats:
   * [ ] Fix the EPUB output:
         https://bookdown.org/yihui/bookdown/e-books.html
@@ -35,6 +35,7 @@
         Possible implementations:
         https://stackoverflow.com/questions/40735727/create-index-of-definitions-theorems-at-end-of-bookdown-book?rq=4
 * [ ] Misc:
+  * [ ] Merge `structure` and `templates`?
   * [ ] Suport for a `BASE_URL` environment variable?
         It would be applied as a template variable in `%%base_url%%` placeholers,
         allowing the compile material to have links among themselves.
diff --git a/_output.yml b/_output.yml
index 62874f8..272cbc6 100644
--- a/_output.yml
+++ b/_output.yml
@@ -76,9 +76,9 @@ bookdown::tufte_book2:
   template: vendor/bookup/templates/tufte-handout.tex
 
   includes:
-    in_header:   vendor/bookup/structure/book/00-header.tex
-    before_body: vendor/bookup/structure/book/00-preamble.tex
-    after_body:  vendor/bookup/structure/book/99-end.tex
+    in_header:   vendor/bookup/structure/book/pt-br/00-header.tex
+    before_body: vendor/bookup/structure/book/pt-br/00-preamble.tex
+    after_body:  vendor/bookup/structure/book/pt-br/99-end.tex
   toc: true
   toc_depth: 3
   #toc_appendix: true
diff --git a/bin/compile-book b/bin/compile-book
index 2907e98..5c8447a 100755
--- a/bin/compile-book
+++ b/bin/compile-book
@@ -7,11 +7,20 @@
 BASENAME="`basename $0 | sed -e 's/\(.\)/\U\1/'`"
 DIRNAME="`dirname $0`"
 BASEDIR="$DIRNAME/.."
-STRUCTURE="structure/book"
 CONTENT="content/sections"
 OUTPUT="${1:-book}"
 REVISION="$2"
 DATE="$3"
+LANG="`grep lang _common.yml _book.yml _notes.yml 2> /dev/null | tail -1 | cut -d : -f 3 | sed -e 's/"//g' -e 's/ //g'`"
+
+# Set the language
+if [ -z "$LANG" ]; then
+  LANG="en"
+fi
+
+# Set structure and templates
+STRUCTURE="structure/book/$LANG"
+TEMPLATES="templates/book/$LANG"
 
 # Remove any dangling output files
 rm -f $OUTPUT.md $OUTPUT.Rmd
@@ -42,7 +51,7 @@ if [ -d "$CONTENT" ]; then
   find $CONTENT -type f | grep '\.md$' | sort | while read file; do
     cat $file >> $OUTPUT.md
     echo "" >> $OUTPUT.md
-    cat $BASEDIR/templates/book/references.md >> $OUTPUT.md
+    cat $BASEDIR/$TEMPLATES/references.md >> $OUTPUT.md
     echo "" >> $OUTPUT.md
   done
 fi
diff --git a/bin/compile-notes b/bin/compile-notes
index 24c98ea..c56c56b 100755
--- a/bin/compile-notes
+++ b/bin/compile-notes
@@ -7,11 +7,20 @@
 BASENAME="`basename $0 | sed -e 's/\(.\)/\U\1/'`"
 DIRNAME="`dirname $0`"
 BASEDIR="$DIRNAME/.."
-STRUCTURE="structure/notes"
 CONTENT="content/notes"
 OUTPUT="${1:-notes}"
 REVISION="$2"
 DATE="$3"
+LANG="`grep lang _common.yml _book.yml _notes.yml 2> /dev/null | tail -1 | cut -d : -f 3 | sed -e 's/"//g' -e 's/ //g'`"
+
+# Set the language
+if [ -z "$LANG" ]; then
+  LANG="en"
+fi
+
+# Set structure and templates
+STRUCTURE="structure/notes/$LANG"
+TEMPLATES="templates/notes/$LANG"
 
 # Remove any dangling output files
 rm -f $OUTPUT.md
@@ -46,7 +55,7 @@ if [ -d "$CONTENT" ]; then
 fi
 
 # Bibliography section
-cat $BASEDIR/templates/notes/bibliography.md >> $OUTPUT.md
+cat $BASEDIR/$TEMPLATES/bibliography.md >> $OUTPUT.md
 
 # Revision information
 sed -i -e "s|%%revision%%|$REVISION|g" -e "s|%%date%%|$DATE|g" $OUTPUT.md
diff --git a/structure/book/00-header.tex b/structure/book/en/00-header.tex
index ded10bd..ded10bd 100644
--- a/structure/book/00-header.tex
+++ b/structure/book/en/00-header.tex
diff --git a/structure/book/00-header.yml b/structure/book/en/00-header.yml
index 2ad19fe..2ad19fe 100644
--- a/structure/book/00-header.yml
+++ b/structure/book/en/00-header.yml
diff --git a/structure/book/en/00-preamble.md b/structure/book/en/00-preamble.md
new file mode 100644
index 0000000..b11b806
--- /dev/null
+++ b/structure/book/en/00-preamble.md
@@ -0,0 +1,55 @@
+<!-- Bookdown HTML before-body file -->
+
+<!-- Hack to generate a proper cover and fix the missing index.html file -->
+<!-- See https://stackoverflow.com/questions/58340924/bookdown-generates-index-file-with-a-chapter-title-instead-of-index-html-when -->
+<!-- See https://bookdown.org/yihui/rmarkdown-cookbook/document-metadata.html -->
+```{r echo=FALSE, results='asis'}
+if (knitr::is_html_output()) {
+  cat('# Start {#index .unnumbered}')
+  cat("\n")
+  cat('<img src="images/cover.png">')
+  cat("\n")
+  cat("<h2>Sobre</h2>")
+  cat("\n")
+  cat('<em>')
+  cat(readLines('DISCLAIMER'), sep='\n')
+  cat('</em>')
+  cat('<br/><br/>')
+  cat('Living Book - Version <strong><em>')
+  cat(readLines('.metadata/revision.txt'), sep='\n')
+  cat('</em></strong> - compiled at <strong><em>')
+  cat(readLines('.metadata/date.txt'), sep='\n')
+  cat('</em></strong>.')
+  cat('<br/>')
+  cat('Older versions available in the <a href="/archive">archive</a>.')
+  cat('<br/>')
+  cat('Notebook available <a href="/notes">here</a>.')
+  cat('<br/><br/>')
+  cat(readLines('snippets/project.txt'))
+  cat(' - ')
+  cat(readLines('snippets/volume.txt'))
+  cat('<br/>')
+  cat('Published by ')
+  cat(rmarkdown::metadata$publisher)
+  cat('<br/>')
+  cat('Published at ')
+  cat(readLines('snippets/url.txt'), sep='\n')
+  cat('<br/><br/>')
+  cat(readLines('snippets/keywords.txt'), sep='\n')
+  cat("\n")
+  cat("<h2>Credits</h2>")
+  cat("\n")
+  cat(paste(rmarkdown::metadata$title, "<br/>", "Copyleft &copy;", readLines('.metadata/year.txt'), rmarkdown::metadata$author, readLines('snippets/contact.txt'), sep=' '))
+  cat('<br/><br/>')
+  cat(readLines('LICENSE'), sep='\n')
+  cat('<br/><br/>')
+  cat(readLines('snippets/cover.txt'), sep='\n')
+  cat("<h2>Versão PDF</h2>")
+  cat("\n")
+  cat('Download the PDF <a href="book.pdf">here</a>, or browse it below:')
+  cat("\n")
+  cat('<br/><br/>')
+  cat('<embed src="book.pdf" width="100%" height="375" type="application/pdf">')
+  cat('<br/><br/>')
+}
+```
diff --git a/structure/book/en/00-preamble.tex b/structure/book/en/00-preamble.tex
new file mode 100644
index 0000000..91c84bc
--- /dev/null
+++ b/structure/book/en/00-preamble.tex
@@ -0,0 +1,59 @@
+% Bookdown LaTeX before-body file
+
+% Front matter
+\frontmatter
+
+% Cover image
+% See https://stackoverflow.com/questions/45963505/coverpage-and-copyright-notice-before-title-in-r-bookdown
+%     https://tex.stackexchange.com/questions/39147/scale-image-to-page-width
+%     https://stackoverflow.com/questions/1963923/adding-full-page-figures-in-latex-how
+\includepdf{images/cover.png}
+
+% Do not print the default title set in the template
+\let\maketitle\oldmaketitle
+% Uncomment this to duplicate the book title
+% This might also clear the \@title variable
+%\maketitle
+
+% Metadata page
+\newpage
+\begin{fullwidth}
+~\vfill
+\thispagestyle{empty}
+\setlength{\parindent}{0pt}
+\setlength{\parskip}{\baselineskip}
+\makeatletter\@title\makeatother
+
+Copyleft \copyright\ \input{.metadata/year.txt} \thanklessauthor\  \input{snippets/contact.txt}
+
+\input{LICENSE}
+
+\input{snippets/keywords.txt}
+
+\input{snippets/cover.txt}
+
+% Some \input statements need to be protected
+% See https://texfaq.org/FAQ-extrabrace
+%     https://www.typeerror.org/docs/latex/_005cprotect
+\par\smallcaps{\protect\input{snippets/project.txt} - \protect\input{snippets/volume.txt}}
+
+\par\smallcaps{Published by \thanklesspublisher}
+
+\par\smallcaps{\protect\input{snippets/url.txt}}
+
+%\par\textit{First impression, \input{.metadata/year.txt}}
+\par Living Book - Version \textit{\textbf{\input{.metadata/revision.txt}}} compiled at \textit{\textbf{\input{.metadata/date.txt}}}
+\end{fullwidth}
+
+% Disclaimer
+\newpage
+\begin{fullwidth}
+~\vfill
+\thispagestyle{empty}
+\setlength{\parindent}{0pt}
+\setlength{\parskip}{\baselineskip}
+\textit{\input{DISCLAIMER}}
+\end{fullwidth}
+
+% Start the main matter (normal chapters)
+\mainmatter
diff --git a/structure/book/en/99-biblio.md b/structure/book/en/99-biblio.md
new file mode 100644
index 0000000..83817b6
--- /dev/null
+++ b/structure/book/en/99-biblio.md
@@ -0,0 +1,9 @@
+\backmatter
+
+<!-- Neat way to have HTML comments: https://stackoverflow.com/a/43902043 -->
+<!-- This seems not to be the case anymore: https://bookdown.org/yihui/bookdown/citations.html -->
+<script type="text/html">
+`r if (knitr::is_html_output()) '# Bibliografia'`
+</script>
+
+# Bibliography
diff --git a/structure/book/en/99-end.tex b/structure/book/en/99-end.tex
new file mode 100644
index 0000000..0cf238b
--- /dev/null
+++ b/structure/book/en/99-end.tex
@@ -0,0 +1,35 @@
+% Bookdown LaTeX footer file
+
+% Put all indexes in a final chapter
+\chapter{Index}
+
+%Lists of tables, figures, definitions and etimologies.
+%Lists of tables and figures.
+Lists of tables, figures etc.
+
+% Print the list of tables
+\listoftables
+
+% Print the list of figures
+\listoffigures
+
+% Print the list of definitions
+% See https://latex.org/forum/viewtopic.php?t=17679
+%     https://ctan.org/pkg/thmtools
+\ifx\BookupListDefinitions\undefined
+\else
+  \renewcommand\listtheoremname{List of Definitions}
+  \listoftheorems[ignoreall,show={definition}]
+\fi
+
+% Print the list of etimologies
+% The "proposition" theorem type is allocated for etimologies in this book
+% See the _bookdown.yml at the top-level project folder for more information
+\ifx\BookupListEtimologies\undefined
+\else
+  \renewcommand\listtheoremname{List of Etimologies}
+  \listoftheorems[ignoreall,show={proposition}]
+\fi
+
+% Print the index
+\printindex
diff --git a/structure/book/pt-br/00-header.tex b/structure/book/pt-br/00-header.tex
new file mode 100644
index 0000000..ded10bd
--- /dev/null
+++ b/structure/book/pt-br/00-header.tex
@@ -0,0 +1,84 @@
+% Bookdown LaTeX header file
+
+% Inclusion of external PDF documents (such as a cover image)
+% See https://www.ctan.org/pkg/pdfpages
+\usepackage{pdfpages}
+
+% To properly handle URLs in bibliographies
+% See https://tex.stackexchange.com/questions/484176/biblatex-overflowing-url
+\usepackage{xurl}
+
+% PDF bookmarks
+% See https://ctan.org/pkg/bookmark
+%     https://texdoc.org/serve/bookmark.pdf/0
+\usepackage[depth=2]{bookmark}
+
+% Indexing
+% See https://en.wikibooks.org/wiki/LaTeX/Indexing
+%     https://www.ctan.org/pkg/makeidx
+%     https://bookdown.org/yihui/bookdown/latex-index.html
+%\usepackage{imakeidx}
+\usepackage{makeidx}
+\makeindex
+
+% No matter what is said in the docs, this was required
+% But maybe because tufte::tufte_book was being used instead of bookdown::tufte_book2
+% So perhaps this is not needed anymore
+% See https://bookdown.org/yihui/bookdown/markdown-extensions-by-bookdown.html#theorems
+%     https://ctan.math.illinois.edu/macros/latex/contrib/thmtools/doc/thmtools-manual.pdf
+\usepackage{amsthm,thmtools}
+
+% Bookdown docs recommends to not mess with this
+% See https://bookdown.org/yihui/bookdown/markdown-extensions-by-bookdown.html#theorems
+%\newtheorem{definition}{Definição}[chapter]
+%\newtheorem{hiphotesis}{Hipótese}[chapter]
+%\newtheorem{conjecture}{Conjectura}[chapter]
+%\newtheorem{demonstration}{Demonstração}[chapter]
+%\newtheorem{etimology}{Etimologia}[chapter]
+
+% Fix positions of margin notes
+% See https://ctan.org/pkg/marginfix
+%     https://tex.stackexchange.com/questions/119726/horizontal-margins-for-margin-notes-in-the-tufte-classes
+%     https://tex.stackexchange.com/questions/624033/long-sidenotes-break-marginfix-or-how-to-make-breakable-sidenotes
+\usepackage{marginfix}
+
+% Workaround to theorems work correctly
+% Maybe this is not needed anymore
+% See https://stackoverflow.com/questions/46942352/r-bookdown-document-with-theorem-does-not-render-when-output-file-is-specified
+\let\BeginKnitrBlock\begin \let\EndKnitrBlock\end
+
+% Set page size
+%
+% This command conflicts with something and gives an error
+%\usepackage[paperwidth=6in, paperheight=9in]{geometry}
+%
+% This command needs tuning for the margins
+%\newgeometry{paperwidth=6in, paperheight=9in}
+%
+% This also needs tuning
+% See https://tex.stackexchange.com/questions/201893/change-paper-size-in-tufte-book-class#380699
+%\newgeometry{
+%  % showframe,
+%  paperwidth=6in,
+%  paperheight=9in,
+%  left=0.55in,
+%  right=0.45in,
+%  top=.5in,
+%  bottom=.5in,
+%  marginparsep=0.25in,
+%  marginparwidth=0.65in,
+%  includemp,
+%  includehead,
+%  % The text width and height are calculated automatically.
+%}
+%
+% This should work, but we're setting this at 00-header.md
+%\newgeometry{b5paper}
+
+% Coverpage and copyright notice before title in R bookdown
+% See https://stackoverflow.com/questions/45963505/coverpage-and-copyright-notice-before-title-in-r-bookdown
+\let\oldmaketitle\maketitle
+\AtBeginDocument{\let\maketitle\relax}
+
+% Custom header
+\IfFileExists{snippets/header.tex}{\input{snippets/header.tex}}{}
diff --git a/structure/book/pt-br/00-header.yml b/structure/book/pt-br/00-header.yml
new file mode 100644
index 0000000..2ad19fe
--- /dev/null
+++ b/structure/book/pt-br/00-header.yml
@@ -0,0 +1,45 @@
+# Bookdown YAML header
+# See https://bookdown.org/yihui/bookdown/usage.html#usage
+#     https://bookdown.org/yihui/bookdown/yaml-options.html
+
+# Site
+site: "bookdown::bookdown_site"
+
+# Automatically generate the list of tables and figures
+# These can also be explicitly generated using LaTeX commands
+lot: false
+lof: false
+
+# Cover image
+#cover-image: "images/cover.png"
+
+# Fonts
+mainfont: "Linux Libertine O"
+monofont: "Liberation Mono"
+
+# Paper size
+#papersize: a4paper
+#papersize: letterpaper
+papersize: b5paper
+
+# Geometry
+#geometry: paperwidth=6in,paperheight=9in
+
+# Class option
+# Use "symmetric" in the classoption if you want margin notes in alternating sides
+#classoption: "symmetric,justified"
+#classoption: "twoside,symmetric,justified"
+classoption: "justified"
+
+# Header includes
+header-includes:
+  # Support for deeply nested lists
+  # See https://stackoverflow.com/questions/57945414/too-deeply-nested-at-just-fourth-nesting-level-using-pandoc-with-markdown
+  - \usepackage{enumitem}
+  - \setlistdepth{20}
+  - \renewlist{itemize}{itemize}{20}
+  - \renewlist{enumerate}{enumerate}{20}
+  - \setlist[itemize]{label=$\cdot$}
+  - \setlist[itemize,1]{label=\textbullet}
+  - \setlist[itemize,2]{label=--}
+  - \setlist[itemize,3]{label=*}
diff --git a/structure/book/00-preamble.md b/structure/book/pt-br/00-preamble.md
index f3738c6..f3738c6 100644
--- a/structure/book/00-preamble.md
+++ b/structure/book/pt-br/00-preamble.md
diff --git a/structure/book/00-preamble.tex b/structure/book/pt-br/00-preamble.tex
index d558cc1..d558cc1 100644
--- a/structure/book/00-preamble.tex
+++ b/structure/book/pt-br/00-preamble.tex
diff --git a/structure/book/99-biblio.md b/structure/book/pt-br/99-biblio.md
index c5385cb..c5385cb 100644
--- a/structure/book/99-biblio.md
+++ b/structure/book/pt-br/99-biblio.md
diff --git a/structure/book/99-end.tex b/structure/book/pt-br/99-end.tex
index 1959646..1959646 100644
--- a/structure/book/99-end.tex
+++ b/structure/book/pt-br/99-end.tex
diff --git a/structure/notes/00-header.yml b/structure/notes/en/00-header.yml
index 1404cad..1404cad 100644
--- a/structure/notes/00-header.yml
+++ b/structure/notes/en/00-header.yml
diff --git a/structure/notes/00-preamble.md b/structure/notes/en/00-preamble.md
index 37d097e..37d097e 100644
--- a/structure/notes/00-preamble.md
+++ b/structure/notes/en/00-preamble.md
diff --git a/structure/notes/pt-br/00-header.yml b/structure/notes/pt-br/00-header.yml
new file mode 100644
index 0000000..1404cad
--- /dev/null
+++ b/structure/notes/pt-br/00-header.yml
@@ -0,0 +1,20 @@
+site  : "bookdown::bookdown_site"
+output:
+  bookdown::gitbook:
+    config:
+      toc:
+        collapse: section
+      toolbar:
+      # Default search indexing is very slow: there's lots of notes to be indexed at each page load
+      # Because of that, it may be better to disable search by default
+      #search: no
+      # Fuse search engine is faster
+      search:
+        engine: fuse
+      sharing: no
+    fontsettings:
+      theme: night
+      family: sans
+      size: 2
+    #split_by: chapter+number
+    #split_by: section
diff --git a/structure/notes/pt-br/00-preamble.md b/structure/notes/pt-br/00-preamble.md
new file mode 100644
index 0000000..37d097e
--- /dev/null
+++ b/structure/notes/pt-br/00-preamble.md
@@ -0,0 +1,32 @@
+<!-- Bookdown HTML before-body file -->
+
+<!-- Hack to generate a proper cover and fix the missing index.html file -->
+<!-- See https://stackoverflow.com/questions/58340924/bookdown-generates-index-file-with-a-chapter-title-instead-of-index-html-when -->
+<!-- See https://bookdown.org/yihui/rmarkdown-cookbook/document-metadata.html -->
+```{r echo=FALSE, results='asis'}
+if (knitr::is_html_output()) {
+  cat('# Início {#index .unnumbered}')
+  cat("\n")
+  cat('<img src="images/cover.png">')
+  cat("\n")
+  cat("<h2>Sobre</h2>")
+  cat("\n")
+  cat('<em>')
+  cat(readLines('DISCLAIMER'), sep='\n')
+  cat('</em>')
+  cat('<br/><br/>')
+  cat('Cardeno Vivo - Versão <strong><em>')
+  cat(readLines('.metadata/revision.txt'), sep='\n')
+  cat('</em></strong> - compilada em <strong><em>')
+  cat(readLines('.metadata/date.txt'), sep='\n')
+  cat('</em></strong>.')
+  cat('<br/><br/>')
+  cat("\n")
+  cat("<h2>Créditos</h2>")
+  cat("\n")
+  cat(paste(rmarkdown::metadata$title, "<br/>", "Copyleft &copy;", readLines('.metadata/year.txt'), rmarkdown::metadata$author, readLines('snippets/contact.txt'), sep=' '))
+  cat('<br/><br/>')
+  cat(readLines('LICENSE'), sep='\n')
+  cat('<br/><br/>')
+}
+```
diff --git a/templates/book/en/references.md b/templates/book/en/references.md
new file mode 100644
index 0000000..ebac3cb
--- /dev/null
+++ b/templates/book/en/references.md
@@ -0,0 +1,8 @@
+<!-- Include the references subsection only in the HTML version -->
+```{r echo=FALSE, results='asis'}
+if (knitr::is_html_output()) {
+  cat("## References")
+  cat("\n")
+  cat("\n")
+}
+```
diff --git a/templates/book/references.md b/templates/book/pt-br/references.md
index cf028c9..cf028c9 100644
--- a/templates/book/references.md
+++ b/templates/book/pt-br/references.md
diff --git a/templates/notes/en/bibliography.md b/templates/notes/en/bibliography.md
new file mode 100644
index 0000000..b87ff79
--- /dev/null
+++ b/templates/notes/en/bibliography.md
@@ -0,0 +1 @@
+# Bibliography
diff --git a/templates/notes/bibliography.md b/templates/notes/pt-br/bibliography.md
index 1c6d0e6..1c6d0e6 100644
--- a/templates/notes/bibliography.md
+++ b/templates/notes/pt-br/bibliography.md