Add partial port of Pandex

Also bump to 0.12.2 and update documentation.

This commit should resolve #43 and also address #41.
Still needed is some better documentation about how to configure Lodox.

Pandex: https://github.com/FilterKaapi/pandex

README.md

@@ -32,7 +32,7 @@ Finally, add Lodox to your `plugins` list:
  [% ...
   {lodox, ".*",
    {git, "git://github.com/quasiquoting/lodox.git",
-    {tag, "0.12.1"}}}]}.
+    {tag, "0.12.2"}}}]}.
 ```
 
 The recommended place for the Lodox plugin entry is the global [rebar3](https://github.com/rebar/rebar3) config, `~/.config/rebar3/rebar.config`,
@@ -60,7 +60,7 @@ rebar3 do compile, lfe lodox
 
 If all goes well, the output will look something like:
 
-    Generated lodox v0.12.1 docs in /path/to/lodox/doc
+    Generated lodox v0.12.2 docs in /path/to/lodox/doc
 
 And, as promised, [generated documentation](http://quasiquoting.org/lodox/) will be in the `doc` subdirectory of
 your project.

org/Lodox.org

@@ -499,13 +499,7 @@ Use [pandoc] if available, otherwise [erlmarkdown].
 [erlmarkdown]: https://github.com/erlware/erlmarkdown"
   (case (os:find_executable "pandoc")
     ('false (markdown:conv_utf8 markdown))
-    (pandoc (let* ((tmp-md (doto (filename:absname "./tmp.md")
-                                 (file:write_file markdown)))
-                   (html   (os:cmd (++ pandoc
-                                       " -f markdown_github -t html "
-                                       tmp-md))))
-              (file:delete tmp-md)
-              html))))
+    (pandoc (let ((`#(ok ,html) (pandoc:convert-string markdown))) html))))
 
 (defun format-wikilinks
   ([`#m(libs ,libs modules ,modules) html init]
@@ -1391,6 +1385,72 @@ Equivalent to [[search-funcs/3]] with `` 'undefined `` as `starting-mod`."
   (lists:takewhile (lambda (c) (=/= c #\:)) func-name))
 #+END_SRC
 
+** pandoc
+   :PROPERTIES:
+   :tangle:   ../src/pandoc.lfe
+   :END:
+[[https://github.com/quasiquoting/lodox/blob/master/src/pandoc.lfe][Source]]
+
+A partial LFE port of [[https://github.com/FilterKaapi/pandex][Pandex]].
+#+BEGIN_SRC lfe :exports none
+<<generated()>>
+#+END_SRC
+#+BEGIN_SRC lfe
+(defmodule pandoc
+  (doc "A partial LFE port of [Pandex][].
+
+[Pandex]: https://github.com/FilterKaapi/pandex")
+  (export all))
+
+(include-lib "clj/include/compose.lfe")
+
+(defun convert-string (string)
+  "Equivalent to `(`[[convert-string/3]]` string \"markdown_github\" \"html\")`."
+  (convert-string string "markdown_github" "html"))
+
+(defun convert-string (string from to)
+  "Equivalent to `(`[[convert-string/4]]` string from to [])`."
+  (convert-string string from to []))
+
+(defun convert-string (string from to _options)
+  (let ((dot-temp ".temp"))
+    (if (filelib:is_dir dot-temp) 'ok (file:make_dir dot-temp))
+    (let ((name (filename:join dot-temp (random-name))))
+      (file:write_file name string)
+      (let ((`#(ok ,output) (convert-file name from to)))
+        (file:delete name)
+        `#(ok ,output)))))
+
+(defun convert-file (file)
+  "Equivalent to `(`[[convert-file/3]]` file \"markdown_github\" \"html\")`."
+  (convert-file file "markdown" "html"))
+
+(defun convert-file (file from to)
+  "Equivalent to `(`[[convert-file/4]]` file from to [])`."
+  (convert-file file from to []))
+
+(defun convert-file (file from to _options)
+  "[[convert-file/4]] works under the hood of all the other functions."
+  (let ((output (os:cmd (++ "pandoc " file " -f " from " -t " to))))
+    `#(ok ,output)))
+
+(defun random-name ()
+  (++ (random-string) "-" (timestamp) ".md"))
+
+(defun random-string ()
+  (random:seed (erlang:monotonic_time)
+               (erlang:time_offset)
+               (erlang:unique_integer))
+  (-> #0x100000000000000
+      (random:uniform)
+      (integer_to_list 36)
+      (string:to_lower)))
+
+(defun timestamp ()
+  (let ((`#(,megasec ,sec ,_microsec) (os:timestamp)))
+    (-> (* megasec 1000000) (+ sec) (integer_to_list))))
+#+END_SRC
+
 * Macros
   :PROPERTIES:
   :noweb:    yes