pandoc/test/command/lua-pandoc-state.md

```
% pandoc --lua-filter=command/lua-pandoc-state.lua --data-dir=foo
Hello
^D
   # input files: 1
     output file: nil
# request header: 0
   resource path: .
      source URL: nil
   user data dir: defined
           trace: false
       verbosity: WARNING
<p>Hello</p>
```
Lua: allow access to pandoc state (#5015) * Lua: allow access to pandoc state Lua filters and custom writers now have read-only access to most fields of pandoc's internal state via the global variable `PANDOC_STATE`. * Lua: allow iterating through fields of PANDOC_STATE * Lua filters doc: describe CommonState * Lua filters doc: mention global variable PANDOC_STATE * Lua: add access to logs Log messages can currently only be printed, but not decomposed. 2018-10-26 07:12:14 +02:00			```
Use XDG data directory for user data directory. Instead of `$HOME/.pandoc`, the default user data directory is now `$XDG_DATA_HOME/pandoc`, where `XDG_DATA_HOME` defaults to `$HOME/.local/share` but can be overridden by setting the environment variable. If this directory is missing, then `$HOME/.pandoc` is searched instead, for backwards compatibility. However, we recommend moving local pandoc data files from `$HOME/.pandoc` to `$HOME/.local/share/pandoc`. On Windows the default user data directory remains the same. Closes #3582. 2019-03-03 00:03:59 +01:00			`% pandoc --lua-filter=command/lua-pandoc-state.lua --data-dir=foo`
Lua: allow access to pandoc state (#5015) * Lua: allow access to pandoc state Lua filters and custom writers now have read-only access to most fields of pandoc's internal state via the global variable `PANDOC_STATE`. * Lua: allow iterating through fields of PANDOC_STATE * Lua filters doc: describe CommonState * Lua filters doc: mention global variable PANDOC_STATE * Lua: add access to logs Log messages can currently only be printed, but not decomposed. 2018-10-26 07:12:14 +02:00			`Hello`
			`^D`
Change optInputFiles to a `Maybe [FilePath]`. `Nothing` means: nothing specified. `Just []` means: an empty list specified (e.g. in defaults). Potentially these could lead to different behavior: see #5888. 2019-11-15 03:42:55 +01:00			`# input files: 1`
Lua: allow access to pandoc state (#5015) * Lua: allow access to pandoc state Lua filters and custom writers now have read-only access to most fields of pandoc's internal state via the global variable `PANDOC_STATE`. * Lua: allow iterating through fields of PANDOC_STATE * Lua filters doc: describe CommonState * Lua filters doc: mention global variable PANDOC_STATE * Lua: add access to logs Log messages can currently only be printed, but not decomposed. 2018-10-26 07:12:14 +02:00			`output file: nil`
			`# request header: 0`
			`resource path: .`
			`source URL: nil`
			`user data dir: defined`
			`trace: false`
			`verbosity: WARNING`
			`<p>Hello</p>`
			```