Extend lesson YAML to enable DOI badge for peer-reviewed lessons

NEWS.md

@@ -11,6 +11,10 @@
   appended. Note that when clicking these links, the user will remain in
   instructor view. This behaviour may change in future iterations (reported:
   @karenword, #394; fixed: @ErinBecker, #530, reviewed: @zkamvar)
+* DOI badges can now be displayed when paired with {varnish} version 0.4.0 by
+  adding the `doi:` key to the `config.yaml` file with either the raw DOI or
+  the URL to the DOI (reported: @tobyhodges, carpentries/workbench#67;
+  fixed: @tobyhodges, #535).
 
 ## BUG FIX
 

R/utils-yaml.R

@@ -161,6 +161,10 @@ create_pkgdown_yaml <- function(path) {
   handout <- if (is.null(usr$handout)) "~" else usr$handout
   handout <- if (isTRUE(handout)) "files/code-handout.R" else handout
   yaml <- get_yaml_text(template_pkgdown())
+  # Should we display DOI info? If so, parse the URL and return the doi
+  # note that a missing doi will return nothing
+  doi <- sub("^[/]", "", xml2::url_parse(usr$doi)$path)
+  doi <- if (length(doi) == 1L && nzchar(doi)) siQuote(doi) else "~"
   yaml <- whisker::whisker.render(yaml,
     data = list(
       # Basic information
@@ -182,10 +186,12 @@ create_pkgdown_yaml <- function(path) {
       dc             = usr$carpentry == 'dc',
       swc            = usr$carpentry == 'swc',
       # Should we display a lifecycle banner?
-      life_cycle = if (usr$life_cycle == "stable")    "~"  else siQuote(usr$life_cycle),
-      pre_alpha  = if (usr$life_cycle == "pre-alpha") TRUE else "~",
-      alpha      = if (usr$life_cycle == "alpha")     TRUE else "~",
-      beta       = if (usr$life_cycle == "beta")      TRUE else "~",
+      life_cycle = siQuote(usr$life_cycle),
+      pre_alpha  = usr$life_cycle == "pre-alpha",
+      alpha      = usr$life_cycle == "alpha",
+      beta       = usr$life_cycle == "beta",
+      stable     = usr$life_cycle == "stable",
+      doi        = doi,
       NULL
     )
   )
@@ -238,4 +244,3 @@ quote_config_items <- function(yaml) {
   }
   yaml
 }
-

inst/templates/pkgdown-yaml-template.txt

@@ -1,7 +1,7 @@
-# ------------------------------------------------------------------ information 
+# ------------------------------------------------------------------ information
 # This file was generated by sandpaper version {{ version }}
 # If you want to make changes, please edit {{ config }}
-# ------------------------------------------------------------------ information 
+# ------------------------------------------------------------------ information
 title: {{ title }} # needed to set the site title
 home:
   title: Home
@@ -27,3 +27,5 @@ template:
     pre_alpha: {{ pre_alpha }}
     alpha: {{ alpha }}
     beta: {{ beta }}
+    stable: {{ stable }}
+    doi: {{ doi }}