separate render/content macros; add has_jack

jack/src/from_jack.rs

@@ -1,13 +0,0 @@
-use crate::*;
-
-/// Implement [TryFrom<&Arc<RwLock<JackConnection>>>]: create app state from wrapped JACK handle.
-#[macro_export] macro_rules! from_jack {
-    (|$jack:ident|$Struct:ident$(<$($L:lifetime),*$($T:ident$(:$U:path)?),*>)? $cb:expr) => {
-        impl $(<$($L),*$($T $(: $U)?),*>)? TryFrom<&Arc<RwLock<JackConnection>>> for $Struct $(<$($L),*$($T),*>)? {
-            type Error = Box<dyn std::error::Error>;
-            fn try_from ($jack: &Arc<RwLock<JackConnection>>) -> Usually<Self> {
-                Ok($cb)
-            }
-        }
-    };
-}

jack/src/has_jack.rs

@@ -3,3 +3,22 @@ use crate::*;
 pub trait HasJack {
     fn jack (&self) -> &Arc<RwLock<JackConnection>>;
 }
+
+/// Implement [HasJack].
+#[macro_export] macro_rules! has_jack {
+    (|$self:ident:$Struct:ident$(<$($L:lifetime),*$($T:ident$(:$U:path)?),*>)?|$cb:expr) => {
+        impl $(<$($L),*$($T $(: $U)?),*>)? HasJack for $Struct $(<$($L),*$($T),*>)? {
+            fn jack (&$self) -> &Arc<RwLock<JackConnection>> { $cb }
+        }
+    };
+}
+
+/// Implement [TryFrom<&Arc<RwLock<JackConnection>>>]: create app state from wrapped JACK handle.
+#[macro_export] macro_rules! from_jack {
+    (|$jack:ident|$Struct:ident$(<$($L:lifetime),*$($T:ident$(:$U:path)?),*>)? $cb:expr) => {
+        impl $(<$($L),*$($T $(: $U)?),*>)? TryFrom<&Arc<RwLock<JackConnection>>> for $Struct $(<$($L),*$($T),*>)? {
+            type Error = Box<dyn std::error::Error>;
+            fn try_from ($jack: &Arc<RwLock<JackConnection>>) -> Usually<Self> { Ok($cb) }
+        }
+    };
+}

jack/src/lib.rs

@@ -10,7 +10,6 @@ pub(crate) use ::jack::{
     Unowned, MidiIn, MidiOut, AudioIn, AudioOut,
 };
 
-mod from_jack;    pub use self::from_jack::*;
 mod has_jack;     pub use self::has_jack::*;
 mod jack_audio;   pub use self::jack_audio::*;
 mod jack_connect; pub use self::jack_connect::*;