pandoc: playing with filters

Signed-off-by: lucasew <[email protected]>

Author: lucasew

pandoc/hello-filter/demo.md

@@ -0,0 +1,20 @@
+---
+title: Hello world
+name: Lucas
+dia: hoje
+---
+
+# %title%
+
+Hello, %name%
+
+Hoje é %dia%
+
+```brainfuck
+???
+%title%
+```
+
+```evalme
+return pandoc.Para(tostring(2 + 2))
+```

pandoc/hello-filter/filter.lua

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+local pandoc = require 'pandoc'
+local utils = require 'pandoc.utils'
+local stringify = utils.stringify
+
+local gdoc = {}
+local meta = {}
+
+function Str(el) do
+    -- print("chegou aqui = ", el.text)
+    local text = el.text
+    local rep = meta[text]
+    if rep ~= nil then
+        text = rep
+    end
+    return pandoc.Str(text)
+end
+end
+
+function Pandoc(doc) do
+    gdoc = doc
+    for k, v in pairs(doc.meta) do
+        meta["%" .. k .. "%"] = stringify(v)
+        -- print(k, " = ", stringify(v))
+    end
+    return doc
+end
+end
+
+function CodeBlock(el) do
+    local lang = el.attr.classes[1]
+    local text = el.text
+    if lang == "evalme" then
+        fn = load(text)
+        return fn()
+    else
+        -- return pandoc.Para(text .. ":" .. lang)
+    end
+end
+end
+
+return {
+    { Pandoc = Pandoc },
+    { Str = Str },
+    { CodeBlock = CodeBlock },
+}

pandoc/hello-filter/shell.nix

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+{pkgs ? import <nixpkgs> {}}:
+pkgs.mkShell {
+  buildInputs = with pkgs; [
+    pandoc
+  ];
+  shellHook = ''
+    function run {
+      pandoc demo.md  -f markdown -t html --lua-filter filter.lua "$@"
+    }
+  '';
+}