Improve error messages (#262)

* Add error for missing config.toml

* Fix missing bibliography error

* Fix tests

defaults/metadata.yml

@@ -36,7 +36,6 @@ code-block-font-size: \scriptsize
 
 titlepage: true
 linkReferences: true
-bibliography: bibliography.bib
 link-citations: true
 
 # These table of contents settings only affect the PDF.

docs/metadata.yml

@@ -22,6 +22,8 @@ pdf-footer: ""
 # Avoid adding a blank page before each chapter.
 disable-cleardoublepage: true
 
+bibliography: bibliography.bib
+
 titlepage-top: >
   \begin{tabular}{l}
   Rik Huijzer\\

src/build.jl

@@ -222,12 +222,14 @@ Return the url prefix when `is_ci() == true`.
 
 # Example
 ```jldoctest
-julia> cd(pkgdir(Books)) do
+julia> docs_dir = joinpath(pkgdir(Books), "docs");
+
+julia> cd(docs_dir) do
            Books.ci_url_prefix("default")
        end
 ""
 
-julia> cd(joinpath(pkgdir(Books), "docs")) do
+julia> cd(docs_dir) do
            Books.ci_url_prefix("test")
        end
 "/Example.jl"

src/defaults.jl

@@ -69,7 +69,17 @@ end
 
 function user_config(project::AbstractString)
     path = "config.toml"
-    isfile(path) ? project_info(path, project) : nothing
+    if isfile(path)
+        return project_info(path, project)
+    else
+        default_config_path = joinpath(Books.DEFAULTS_DIR, "config.toml")
+        absolute_config_path = joinpath(pwd(), "config.toml")
+        msg = """
+            No file found at $absolute_config_path.
+            (See $default_config_path for an example configuration.)
+            """
+        @warn msg
+    end
 end
 
 """