1 files changed, 210 insertions, 0 deletions
diff --git a/count-para.lua b/count-para.lua
new file mode 100755
index 0000000..6d4b659
--- /dev/null
+++ b/count-para.lua
@@ -0,0 +1,210 @@
+--[[
+Make all 'regular' paragraphs into a div and assign a numeric ID
+Format this number in the margin
+Copyright © 2021 Michael Cysouw <cysouw@mac.com>
+Permission to use, copy, modify, and/or distribute this software for any
+purpose with or without fee is hereby granted, provided that the above
+copyright notice and this permission notice appear in all copies.
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+]]
+
+local count = 0
+local chapter = 0
+local indexUserID = {}
+
+------------------------------
+-- Options with default values
+------------------------------
+
+local resetAtChapter = false
+local enclosing = "[]"
+local chapterSep = "."
+local refName = "paragraph "
+local addPageNr = true
+
+function getUserSettings (meta)
+
+  if meta.resetAtChapter ~= nil then
+    resetAtChapter = meta.resetAtChapter
+  end
+
+  if meta.enclosing ~= nil then
+    enclosing = pandoc.utils.stringify(meta.enclosing)
+  end
+
+  if meta.chapterSep ~= nil then
+    chapterSep = pandoc.utils.stringify(meta.chapterSep)
+  end
+
+  if meta.refName ~= nil then
+    refName = pandoc.utils.stringify(meta.refName)
+    if FORMAT:match "latex" then
+      if refName == "#" then refName = "\\#" end
+    end
+  end
+
+  if meta.addPageNr ~= nil then
+    addPageNr = meta.addPageNr
+  end
+
+end
+
+------------------------
+-- Add global formatting
+------------------------
+
+function addFormatting (meta)
+
+  local tmp = pandoc.MetaList{meta['header-includes']}
+  if meta['header-includes'] ~= nil then
+    tmp = meta['header-includes']
+  end
+  
+  if FORMAT:match "html" then
+    local css = [[ 
+<!-- CSS added by lua-filter 'count-para' -->
+<style>
+.paragraph-number { 
+  float: left;
+  margin-left: -5em;
+  width: 4.5em;
+  text-align: right;
+  color: grey;
+  font-size: x-small;
+  padding-top: 5px;
+}
+</style>
+    ]]
+    tmp[#tmp+1] = pandoc.MetaBlocks(pandoc.RawBlock("html", css))
+  end
+  
+  function addTexPreamble (tex)
+    tmp[#tmp+1] = pandoc.MetaBlocks(pandoc.RawBlock("tex", tex))
+  end
+
+  if FORMAT:match "latex" then
+    addTexPreamble("\\usepackage{marginnote}")
+    addTexPreamble("\\reversemarginpar")
+    addTexPreamble("\\usepackage{xcolor}") 
+    addTexPreamble("\\newcommand{\\paragraphnumber}[1]{\\marginnote{\\color{black}\\tiny{#1}}[0pt]}")
+  end
+  
+  meta['header-includes'] = tmp
+  return(meta)
+end
+
+-------------------------
+-- count Para and add Div
+-------------------------
+
+function countPara (doc)
+
+  for i=1,#doc.blocks do
+
+    -- optionally reset counter
+    if  doc.blocks[i].tag == "Header"
+        and doc.blocks[i].level == 1
+        and doc.blocks[i].classes[1] ~= "unnumbered" 
+        and resetAtChapter
+    then
+        chapter = chapter + 1
+        count = 0
+    end
+
+    -- get Para, but not if there is an Image inside
+    if  doc.blocks[i].tag == "Para"
+        and doc.blocks[i].content[1].tag ~= "Image"
+    then
+
+      -- count paragraphs
+      count = count + 1	
+      local ID = count
+      if resetAtChapter then 
+        ID = chapter..chapterSep..count 
+      end
+
+      -- format number to insert
+      local number = ID
+      if enclosing:len() == 1 then
+        number = enclosing..ID..enclosing
+      else
+        number = enclosing:sub(1,1)..ID..enclosing:sub(2,2)
+      end
+
+      -- check for user-inserted ids at the start of the paragraph
+      local firstElem = pandoc.utils.stringify(doc.blocks[i].content[1])
+      local userID = firstElem:match("{#(.*)}")
+      if userID ~= nil then
+        -- add to index
+        indexUserID[userID] = ID
+        -- remove reference from text
+        table.remove(doc.blocks[i].content, 1)
+        -- remove possible space
+        if doc.blocks[i].content[1].tag == "Space" then
+          table.remove(doc.blocks[i].content, 1)
+        end
+      end
+
+      -- insert number
+      if FORMAT:match "latex" then
+        -- use marginnote for formatting number in margin
+        local texCount = "\\paragraphnumber{"..number.."}"
+        if userID ~= nil then
+          -- add target for link to the number
+          texCount = "\\hypertarget{"..userID.."}{\n"..texCount.."\\label{"..userID.."}}"
+        end
+        table.insert(doc.blocks[i].content, 1, pandoc.RawInline("tex", texCount))
+      else
+        table.insert(doc.blocks[i].content, 1, pandoc.Space())
+        table.insert(doc.blocks[i].content, 1, pandoc.Span(number, pandoc.Attr(ID, {"paragraph-number"})))
+      end
+
+    end
+  end
+  return doc
+end
+
+------------------------------
+-- set in-text cross-references
+------------------------------
+
+function setCrossRefs (cite)
+
+  local userID = cite.citations[1].id
+  local paraID = indexUserID[userID] 
+
+  -- ignore other "cite" elements
+  if paraID ~= nil then
+  
+    -- make in-document cross-references
+    if FORMAT:match "latex" then
+
+      local texInsert = refName.."\\hyperlink{"..userID.."}{"..paraID.."}"
+      if addPageNr then
+        texInsert = texInsert.." on page~\\pageref{"..userID.."}"
+      end
+      return pandoc.RawInline("tex", texInsert)
+
+    else
+      return pandoc.Link(refName..paraID, "#"..paraID)
+    end
+
+  end
+end
+
+--------------------
+-- basic Pandoc loop
+--------------------
+
+return {
+  { Meta = addFormatting },
+  { Meta = getUserSettings },
+  { Pandoc = countPara },
+  { Cite = setCrossRefs }
+}