pandoc_ast: Support multiple versions of pandoc_ast

In order to cope with multiple versions of Pandoc, we need to
support various pandoc_ast versions.  This patch introduces
support for both 0.8 and 0.7, defaulting to the older 0.7.  If
you use Subplot on a system with a much newer pandoc, then switch
to the 0.8 variant to cope.

Signed-off-by: Daniel Silverstone <dsilvers@digital-scurf.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/src/lib.rs b/src/lib.rs
index 5661f92..51712a6 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -5,6 +5,14 @@
 //! stakeholders.
 
 #![deny(missing_docs)]
+
+// Handle the multiple pandoc_ast versions
+
+#[cfg(feature = "pandoc_ast_07")]
+extern crate pandoc_ast_07 as pandoc_ast;
+#[cfg(feature = "pandoc_ast_08")]
+extern crate pandoc_ast_08 as pandoc_ast;
+
 mod error;
 pub use error::Result;
 pub use error::SubplotError;