doctest_fix: try setting fixed default terminal size (#4171)

* doctest_fix: try setting fixed default terminal size

* build_doc: also set terminal size

src/utils/docs.jl

@@ -70,13 +70,15 @@ function doctest_fix(f::Function; set_meta::Bool = false)
   S = Symbol(f)
   doc, doctest = get_document(set_meta)
 
-  with_unicode(false) do
-    #essentially inspired by Documenter/src/DocTests.jl
-    pm = parentmodule(f)
-    bm = Base.Docs.meta(pm)
-    md = bm[Base.Docs.Binding(pm, S)]
-    for s in md.order
-      doctest(md.docs[s], Oscar, doc)
+  withenv("COLUMNS"=>80, "LINES"=>24) do
+    with_unicode(false) do
+      #essentially inspired by Documenter/src/DocTests.jl
+      pm = parentmodule(f)
+      bm = Base.Docs.meta(pm)
+      md = bm[Base.Docs.Binding(pm, S)]
+      for s in md.order
+        doctest(md.docs[s], Oscar, doc)
+      end
     end
   end
 end
@@ -97,14 +99,16 @@ julia> Oscar.doctest_fix("/Rings/")
 function doctest_fix(path::String; set_meta::Bool=false)
   doc, doctest = get_document(set_meta)
 
-  with_unicode(false) do
-    walkmodules(Oscar) do m
-      #essentially inspired by Documenter/src/DocTests.jl
-      bm = Base.Docs.meta(m)
-      for (_, md) in bm
-        for s in md.order
-          if occursin(path, md.docs[s].data[:path])
-            doctest(md.docs[s], Oscar, doc)
+  withenv("COLUMNS"=>80, "LINES"=>24) do
+    with_unicode(false) do
+      walkmodules(Oscar) do m
+        #essentially inspired by Documenter/src/DocTests.jl
+        bm = Base.Docs.meta(m)
+        for (_, md) in bm
+          for s in md.order
+            if occursin(path, md.docs[s].data[:path])
+              doctest(md.docs[s], Oscar, doc)
+            end
           end
         end
       end
@@ -218,11 +222,13 @@ function build_doc(; doctest::Union{Symbol, Bool} = false, warnonly = true, open
   if !isdefined(Main, :BuildDoc)
     doc_init()
   end
-  with_unicode(false) do
-    Pkg.activate(docsproject) do
-      Base.invokelatest(
-        Main.BuildDoc.doit, Oscar; warnonly=warnonly, local_build=true, doctest=doctest
-      )
+  withenv("COLUMNS"=>80, "LINES"=>24) do
+    with_unicode(false) do
+      Pkg.activate(docsproject) do
+        Base.invokelatest(
+          Main.BuildDoc.doit, Oscar; warnonly=warnonly, local_build=true, doctest=doctest
+        )
+      end
     end
   end
   if start_server