Use logging system for doctest-failure reporting.

CHANGELOG.md

@@ -39,6 +39,9 @@
 
 * ![Enhancement][badge-enhancement] The HTML output now also supports SVG, WebP, GIF and JPEG logos. ([#953][github-953])
 
+* ![Enhancement][badge-enhancement] Reporting of failed doctests are now using the logging
+  system to be consistent with the rest of Documenter's output. ([#958][github-958])
+
 * ![Bugfix][badge-bugfix] Paths in `include` calls in `@eval`, `@example`, `@repl` and `jldoctest`
   blocks are now interpreted to be relative `pwd`, which is set to the output directory of the
   resulting file. ([#941][github-941])
@@ -248,6 +251,7 @@
 [github-946]: https://github.com/JuliaDocs/Documenter.jl/pull/946
 [github-948]: https://github.com/JuliaDocs/Documenter.jl/pull/948
 [github-953]: https://github.com/JuliaDocs/Documenter.jl/pull/953
+[github-958]: https://github.com/JuliaDocs/Documenter.jl/pull/958
 
 [documenterlatex]: https://github.com/JuliaDocs/DocumenterLaTeX.jl
 [documentermarkdown]: https://github.com/JuliaDocs/DocumenterMarkdown.jl

src/DocTests.jl

@@ -258,34 +258,28 @@ end
 import .Utilities.TextDiff
 
 function report(result::Result, str, doc::Documents.Document)
-    iob = IOBuffer()
-    ioc = IOContext(iob, :color => Base.have_color)
-    println(ioc, "=====[Test Error]", "="^30)
-    println(ioc)
-    printstyled(ioc, "> Location: ", result.file, color=:cyan)
-    printstyled(ioc, Utilities.find_block_in_file(result.block.code, result.file), color=:cyan)
-    printstyled(ioc, "\n\n> Code block:\n", color=:cyan)
-    println(ioc, "\n```$(result.block.language)")
-    println(ioc, result.block.code)
-    println(ioc, "```")
-    if !isempty(result.input)
-        printstyled(ioc, "\n> Subexpression:\n", color=:cyan)
-        print_indented(ioc, result.input; indent = 4)
-    end
-    warning = Base.have_color ? "" : " (REQUIRES COLOR)"
-    printstyled(ioc, "\n> Output Diff", warning, ":\n\n", color=:cyan)
     diff = TextDiff.Diff{TextDiff.Words}(result.output, rstrip(str))
-    Utilities.TextDiff.showdiff(ioc, diff)
-    println(ioc, "\n\n", "=====[End Error]=", "="^30)
-    push!(doc.internal.errors, :doctest)
-    printstyled(String(take!(iob)), color=:normal)
-end
+    lines = Utilities.find_block_in_file(result.block.code, result.file)
+    @error("""
+        doctest failure in $(Utilities.locrepr(result.file, lines))
 
-function print_indented(buffer::IO, str::AbstractString; indent = 4)
-    println(buffer)
-    for line in split(str, '\n')
-        println(buffer, " "^indent, line)
-    end
+        ```$(result.block.language)
+        $(result.block.code)
+        ```
+
+        Subexpression:
+
+        $(result.input)
+
+        Output:
+
+        $(result.output)
+
+        Expected output:
+
+        $(rstrip(str))
+
+        """, diff)
 end
 
 function fix_doctest(result::Result, str, doc::Documents.Document)

src/Utilities/TextDiff.jl

@@ -87,15 +87,11 @@ end
 prefix(::Diff{Lines}, s::Symbol) = s === :green ? "+ " : s === :red  ? "- " : "  "
 prefix(::Diff{Words}, ::Symbol) = ""
 
-function showdiff(io::IO, diff::Diff)
+function Base.show(io::IO, diff::Diff)
+    get(io, :color, false) || println(io, "Warning: Diff output requires color.")
     for (color, text) in diff.diff
         printstyled(io, prefix(diff, color), text, color=color)
     end
 end
 
-function Base.show(io::IO, diff::Diff)
-    printstyled(io, color=:normal) # Reset colors.
-    showdiff(io, diff)
-end
-
 end

src/Utilities/Utilities.jl

@@ -32,7 +32,7 @@ end
 function locrepr(file, line=nothing)
     str = Base.contractuser(file) # TODO: Maybe print this relative the doc-root??
     line !== nothing && (str = str * "$(line)")
-    return "`$(str)`"
+    return str
 end
 
 # Directory paths.