\pdfcatalog openaction and page actions

luametalatex-back-pdf.lua

@@ -57,6 +57,7 @@ end, 'force', 'protected')
 local infodir = ""
 local namesdir = ""
 local catalogdir = ""
+local catalog_openaction
 local creationdate = os.date("D:%Y%m%d%H%M%S%z"):gsub("+0000$", "Z"):gsub("%d%d$", "'%0")
 local function write_infodir(p)
   local additional = ""
@@ -118,6 +119,9 @@ callback.register("stop_run", function()
   if outline then
     catalogdir = string.format("/Outlines %i 0 R%s", outline:write(pfile), catalogdir)
   end
+  if catalog_openaction then
+    catalogdir = catalogdir .. '/OpenAction' .. catalog_openaction
+  end
   pfile:indirect(pfile.root, string.format([[<</Type/Catalog/Version/%s/Pages %i 0 R%s>>]], pfile.version, pfile:writepages(), catalogdir))
   pfile.info = write_infodir(pfile)
   local size = pfile:close()
@@ -198,6 +202,7 @@ local function get_action_attr(p, action, is_link)
     error[[FIXME]]
   elseif action_type == 1 then -- GoTo
     local id = action.id
+    if id then
       if file then
         assert(type(id) == "string")
         action_attr = action_attr .. "/S/GoToR/D" .. pdf_bytestring(id) .. ">>"
@@ -213,6 +218,16 @@ local function get_action_attr(p, action, is_link)
           action_attr = string.format("%s/S/GoTo/D %i 0 R>>", action_attr, dest)
         end
       end
+    else
+      id = assert(action.page, 'GoTo action must contain either an id or a page')
+      local tokens = action.tokens
+      if file then
+        action_attr = string.format("%s/S/GoToR/D[%i %s]>>", action_attr, id-1, tokens)
+      else
+        local page_objnum = pfile:reservepage(id)
+        action_attr = string.format("%s/S/GoTo/D[%i 0 R %s]>>", action_attr, page_objnum, tokens)
+      end
+    end
   end
   return action_attr
 end
@@ -486,9 +501,15 @@ local function scan_action()
     file = token.scan_keyword'file' and token.scan_string(),
   }
   if token.scan_keyword'page' then
-    error[[TODO]]
+    assert(action_type == 1)
+    local page = token.scan_int()
+    if page <= 0 then
+      error[[page must be positive in action specified]]
+    end
+    action.page = page
+    action.tokens = token.scan_string()
   elseif token.scan_keyword'num' then
-    if action.file and action_type == 3 then
+    if action.file and action_type == 1 then
       error[[num style GoTo actions must be internal]]
     end
     action.id = token.scan_int()
@@ -585,6 +606,15 @@ token.luacmd("pdfextension", function(_, imm)
     infodir = infodir .. token.scan_string()
   elseif token.scan_keyword"catalog" then
     catalogdir = catalogdir .. ' ' .. token.scan_string()
+    if token.scan_keyword'openaction' then
+      if catalog_openaction then
+        tex.error("Duplicate openaction", {"Only one use of \\pdfextension catalog is allowed to \z
+            have an openaction."})
+      else
+        local action = scan_action()
+        catalog_openaction = get_action_attr(get_pfile(), action)
+      end
+    end
   elseif token.scan_keyword"names" then
     namesdir = namesdir .. ' ' .. token.scan_string()
   elseif token.scan_keyword"obj" then

luametalatex-pdf-pagetree.lua

@@ -35,15 +35,31 @@ local function write(pdf, tree, total, max)
   return newtree[1]
 end
 local function newpage(pdf)
-  local pageid = pdf:getobj()
-  local pagenumber = #pdf.pages
-  pdf.pages[pagenumber+1] = pageid
-  if 0 == pagenumber % 6 then
-    pdf.pages[-(pagenumber//6)] = pdf:getobj()
+  local pages = pdf.pages
+  local pagenumber = #pages+1
+  local pageid = pages.reserved and pages.reserved[pagenumber] or pdf:getobj()
+  pages.reserved[pagenumber] = nil
+  pages[pagenumber] = pageid
+  if 1 == pagenumber % 6 then
+    pages[-((pagenumber-1)//6)] = pdf:getobj()
   end
-  return pageid, pdf.pages[-(pagenumber//6)]
+  return pageid, pages[-((pagenumber-1)//6)]
+end
+local function reservepage(pdf, num)
+  local pages = pdf.pages
+  if pages[num] then return pages[num] end
+  local reserved = pages.reserved
+  if reserved then
+    if reserved[num] then return reserved[num] end
+  else
+    reserved = {}
+    pages.reserved = reserved
+  end
+  reserved[num] = pdf:getobj()
+  return reserved[num]
 end
 return {
   write = write,
   newpage = newpage,
+  reservepage = reservepage,
 }

luametalatex-pdf.lua

@@ -134,6 +134,7 @@ local pdfmeta = {
   indirect = indirect,
   stream = stream,
   newpage = pagetree.newpage,
+  reservepage = pagetree.reservepage,
   writepages = pagetree.write,
   delayed = delay,
   delayedstream = delayedstream,