avoid manipulation of global struct

src/run.jl

@@ -47,11 +47,10 @@ function run_doc(
     # cache :all, :user, :off, :refresh
 
     doc.doctype = isnothing(doctype) ? (doctype = detect_doctype(doc.source)) : doctype
-    doc.format = formats[doctype]
-
     if haskey(doc.format.formatdict, :keep_unicode)
         doc.format.formatdict[:keep_unicode] = latex_keep_unicode
     end
+    doc.format = deepcopy(formats[doctype])
 
     doc.cwd = get_cwd(doc, out_path)
     isdir(doc.cwd) || mkpath(doc.cwd)

test/formatter_test.jl

@@ -89,15 +89,15 @@ content = """
 # Test chunk
 α
 """
+chunk = Weave.DocChunk(content, 1, 1)
+fmt = deepcopy(Weave.formats["md2tex"])
+fmtdict = fmt.formatdict
 
-dchunk = Weave.DocChunk(content, 1, 1)
-
-pformat = Weave.formats["md2tex"]
-
-f = Weave.format_chunk(dchunk, pformat.formatdict, pformat)
+f = Weave.format_chunk(chunk, fmtdict, fmt)
 @test f == "\\section{Test chunk}\n\\ensuremath{\\alpha}\n\n"
-pformat.formatdict[:keep_unicode] = true
-f = Weave.format_chunk(dchunk, pformat.formatdict, pformat)
+
+fmtdict[:keep_unicode] = true
+f = Weave.format_chunk(chunk, fmtdict, fmt)
 @test f == "\\section{Test chunk}\nα\n\n"