docs: Fix generation of TeXLive versions table

Author: tarleb

docs/filters/texlive-versions.lua

@@ -1,25 +1,61 @@
+local io     = require 'io'
+local pandoc = require 'pandoc'
+local utils  = require 'pandoc.utils'
+local stringify = utils.stringify
+
+local function tag_strings (tags)
+  local result = pandoc.List{}
+
+  for i = 1, #tags do
+    result:insert(pandoc.Code(stringify(tags[i])))
+    if i < #tags then
+      result:extend{pandoc.Str ',', pandoc.Space()}
+    end
+  end
+  return result
+end
 function CodeBlock (cb)
   if not cb.classes:includes 'texlive-versions' then
     return nil
   end
 
-  -- get simple table from file
-  local fh = io.open 'versions.md'
-  local versions = pandoc.utils.to_simple_table(
-    -- make things more presentable by adding commas
-    pandoc.read(fh:read 'a').blocks[1]:walk{
-      Space = function (_) return {pandoc.Str ',', pandoc.Space()} end
-    }
-  )
-  -- remove alpine and ubuntu columns
-  for _, k in ipairs{'aligns', 'widths', 'headers'} do
-    versions[k]:remove(4) -- ubuntu
-    versions[k]:remove(3) -- alpine
-  end
-  for _, row in ipairs(versions.rows) do
-    row:remove(4) -- ubuntu
-    row:remove(3) -- alpine
+  -- get YAML as metadata from file
+  local fh = io.open 'config.yaml'
+  local config = pandoc.read(fh:read 'a').meta
+
+  local release_numbers = pandoc.List{}
+  for version in pairs(config.release) do
+    release_numbers:insert(version)
   end
+  release_numbers:sort(function (a, b)
+      if a == 'main' then
+        return true
+      elseif b == 'main' then
+        return false
+      end
+      local _, av = pcall(pandoc.types.Version, a)
+      local _, bv = pcall(pandoc.types.Version, b)
+      return av > bv
+  end)
 
-  return pandoc.utils.from_simple_table(versions)
+  local rows = pandoc.List()
+  for release_number in release_numbers:iter() do
+    local release = config.release[release_number]
+    local tags = tag_strings(release['version-tags'])
+    local row = {
+      pandoc.Blocks(release_number),
+      pandoc.Blocks{tags},
+      pandoc.Blocks(release.addon.latex.texlive)
+    }
+    rows:insert(row)
+  end
+  return pandoc.utils.from_simple_table(
+    pandoc.SimpleTable(
+      'TeXLive version that are shipped in the images.',
+      {pandoc.AlignDefault, pandoc.AlignDefault, pandoc.AlignDefault},
+      {0, 0, 0},
+      {{'pandoc version'}, {'tags'}, {'TeXLive version'}},
+      rows
+    )
+  )
 end