Merge pull request #16 from Omikhleia/fix-typesetter-2129

fix(typesetter): Obey blank lines in verbatim-like context

silex/typesetters/base.lua

@@ -359,10 +359,24 @@ function typesetter:typeset (text)
   text = tostring(text)
   if text:match("^%\r?\n$") then return end
   local pId = SILE.traceStack:pushText(text)
-  for token in SU.gtoke(text, SILE.settings:get("typesetter.parseppattern")) do
+  local parsepattern = SILE.settings:get("typesetter.parseppattern")
+  -- NOTE: Big assumption on how to guess were are in "obeylines" mode.
+  -- See https://github.com/sile-typesetter/sile/issues/2128
+  local obeylines = parsepattern == "\n"
+  local seenParaContent = true
+  for token in SU.gtoke(text, parsepattern) do
     if token.separator then
+      if obeylines and not seenParaContent then
+        -- In obeylines mode, each standalone line must be kept.
+        -- The zerohbox is not discardable, so it will be kept in the output,
+        -- and the baseline skip will do the rest.
+        self:pushHorizontal(SILE.types.node.zerohbox())
+     else
+        seenParaContent = false
+     end
       self:endline()
     else
+      seenParaContent = true
       if SILE.settings:get("typesetter.softHyphen") then
         local warnedshy = false
         for token2 in SU.gtoke(token.string, luautf8.char(0x00AD)) do