make tokio features optional

3 files changed, 12 insertions, 2 deletions

diff --git a/Cargo.toml b/Cargo.toml
index 39d925f..739575e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -12,6 +12,10 @@ keywords = ["ttyrec"]
 categories = ["parser-implementations"]
 
 [dependencies]
-futures = "0.1.29"
+futures = { version = "0.1.29", optional = true }
 snafu = "0.5"
-tokio = "0.1.22"
+tokio = { version = "0.1.22", optional = true }
+
+[features]
+default = ["async"]
+async = ["tokio", "futures"]
diff --git a/src/error.rs b/src/error.rs
index 975889b..c106d02 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -17,10 +17,12 @@ pub enum Error {
     FrameTooLong { input: u64 },
 
     /// failed to read from file
+    #[cfg(feature = "async")]
     #[snafu(display("failed to read from file: {}", source))]
     ReadFile { source: tokio::io::Error },
 
     /// failed to write to file
+    #[cfg(feature = "async")]
     #[snafu(display("failed to write to file: {}", source))]
     WriteFile { source: tokio::io::Error },
 }
diff --git a/src/lib.rs b/src/lib.rs
index 5ae78fa..c08be3a 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -20,7 +20,11 @@ mod frame;
 pub use frame::Frame;
 mod parser;
 pub use parser::Parser;
+#[cfg(feature = "async")]
 mod reader;
+#[cfg(feature = "async")]
 pub use reader::Reader;
+#[cfg(feature = "async")]
 mod writer;
+#[cfg(feature = "async")]
 pub use writer::Writer;