Minimal changes to produce passing travis build

.travis.yml

@@ -3,10 +3,20 @@ cache:
   packages: true
   directories: ["book/tex", "_figures", "_cache"]
 
+repos:
+  CRAN: https://cloud.r-project.org
+  ropensci: http://packages.ropensci.org
+
 addons:
   apt:
+    sources:
+      - sourceline: 'ppa:ubuntugis/ppa'
     packages:
       - optipng
+      - libudunits2-dev
+      - libgdal-dev
+      - libgeos-dev
+      - libproj-dev
 
 before_script:
   - tlmgr install index

DESCRIPTION

@@ -8,6 +8,7 @@ URL: https://github.com/hadley/ggplot2-book
 Imports:
   babynames,
   broom,
+  conflicted,
   devtools,
   directlabels,
   dplyr,
@@ -19,14 +20,18 @@ Imports:
   Lahman,
   lubridate,
   magrittr,
+  mapproj,
   maps,
   nlme,
   plyr,
   readr,
   rmarkdown,
   rvest,
+  sf,
+  sp,
   tidyr,
   USAboundaries,
+  USAboundariesData,
   wesanderson,
   xtable
 SystemRequirements: pandoc (>= 1.12.3) - http://johnmacfarlane.net/pandoc

book/ggplot2-book.tex

@@ -29,6 +29,9 @@
 \newcommand{\FunctionTok}[1]{\textcolor[rgb]{0.02,0.16,0.49}{{#1}}}
 \newcommand{\ErrorTok}   [1]{\textcolor[rgb]{1.00,0.00,0.00}{{#1}}}
 \newcommand{\NormalTok}  [1]{{#1}}
+
+\newcommand{\OperatorTok}  [1]{{#1}}
+\newcommand{\ControlFlowTok}  [1]{{#1}}
 %
 \usepackage{longtable}
 \usepackage{booktabs}

book/render-tex.R

@@ -1,14 +1,29 @@
 library("methods") # avoids weird broom error
 library("rmarkdown")
 
+tex_chapter <- function (chapter = NULL, latex_engine = c("xelatex", "pdflatex",
+                                                          "lualatex"), code_width = 65) {
+  options(digits = 3)
+  set.seed(1014)
+  latex_engine <- match.arg(latex_engine)
+  rmarkdown::output_format(rmarkdown::knitr_options("html", chapter),
+                           rmarkdown::pandoc_options(to = "latex",
+                                                     from = "markdown_style",
+                                                     ext = ".tex",
+                                                     args = c("--top-level-division=chapter",
+                                                              rmarkdown::pandoc_latex_engine_args(latex_engine))
+                                                     ),
+                           clean_supporting = FALSE)
+}
+
 path <- commandArgs(trailingOnly = TRUE)
 # command line args should contain just one chapter name
 if (length(path) == 0) {
   message("No input supplied")
 } else {
-  base <- oldbookdown::tex_chapter()
+  base <- tex_chapter()
   base$knitr$opts_knit$width <- 67
   base$pandoc$from <- "markdown"
 
   rmarkdown::render(path, base, output_dir = "book/tex", envir = globalenv(), quiet = TRUE)
-}
+}