From 0a6a11cfabead239eab3baec065d8d6e95bb6447 Mon Sep 17 00:00:00 2001
From: Albert Krewinkel <albert@zeitkraut.de>
Date: Sat, 16 Feb 2019 13:20:33 +0100
Subject: [PATCH] pandoc.mediabag module: add function `empty`
Function `pandoc.mediabag.empty` was added. It allows to clean-out the media
bag, removing all entries.
---
doc/lua-filters.md | 7 ++++++-
src/Text/Pandoc/Lua/Module/MediaBag.hs | 6 ++++++
2 files changed, 12 insertions(+), 1 deletion(-)
diff --git a/doc/lua-filters.md b/doc/lua-filters.md
index 667a58bcc..d60957a2e 100644
--- a/doc/lua-filters.md
+++ b/doc/lua-filters.md
@@ -2448,9 +2448,14 @@ The module is loaded as part of module `pandoc` and can either be
accessed via the `pandoc.mediabag` field, or explicitly required,
e.g.:
-
local mb = require 'pandoc.mediabag'
+### empty {#mediabag-empty}
+
+`empty ()`
+
+Clear-out the media bag, deleting all items.
+
### insert {#mediabag-insert}
`insert (filepath, mime_type, contents)`
diff --git a/src/Text/Pandoc/Lua/Module/MediaBag.hs b/src/Text/Pandoc/Lua/Module/MediaBag.hs
index ce6303ec6..4678d46e8 100644
--- a/src/Text/Pandoc/Lua/Module/MediaBag.hs
+++ b/src/Text/Pandoc/Lua/Module/MediaBag.hs
@@ -34,6 +34,7 @@ import qualified Text.Pandoc.MediaBag as MB
pushModule :: Lua NumResults
pushModule = do
Lua.newtable
+ addFunction "empty" empty
addFunction "insert" insertMediaFn
addFunction "items" items
addFunction "lookup" lookupMediaFn
@@ -60,6 +61,11 @@ setCommonState st = do
modifyCommonState :: (CommonState -> CommonState) -> Lua ()
modifyCommonState f = getCommonState >>= setCommonState . f
+-- | Delete all items from the media bag.
+empty :: Lua NumResults
+empty = 0 <$ modifyCommonState (\st -> st { stMediaBag = mempty })
+
+-- | Insert a new item into the media bag.
insertMediaFn :: FilePath
-> Optional MimeType
-> BL.ByteString