Move cmd coherence result partitioning to macro.

Because we're not cool enough to know what arcane type signature is
needed to add an extension method to the stream itself.

src/commands/coherence.rs

@@ -1,4 +1,5 @@
 use super::converter::validate_event_coherence;
+use super::partition;
 use crate::{
     ai::logic::AiLogic,
     db::Database,
@@ -38,20 +39,9 @@ impl CommandCoherence<'_> {
         &self,
         failures: Vec<EventCoherenceFailure>,
     ) -> ExecutionConversionResult {
-        let (successes, failures): (Vec<_>, Vec<_>) = stream::iter(failures.into_iter())
-            .then(|failure| self.cohere_event(failure))
-            .fold(
-                (vec![], vec![]),
-                |(mut successes, mut failures), res| async {
-                    match res {
-                        Ok(event) => successes.push(event),
-                        Err(err) => failures.push(err),
-                    };
-
-                    (successes, failures)
-                },
-            )
-            .await;
+        let (successes, failures) = partition!(
+            stream::iter(failures.into_iter()).then(|failure| self.cohere_event(failure))
+        );
 
         // TODO we need to use LLM on events that have failed non-LLM coherence.
 
@@ -68,7 +58,7 @@ impl CommandCoherence<'_> {
     }
 
     async fn cohere_event(&self, failure: EventCoherenceFailure) -> CoherenceResult {
-        let event = async {
+        let event_fix = async {
             match failure {
                 EventCoherenceFailure::TargetDoesNotExist(event) => {
                     self.fix_target_does_not_exist(event).await
@@ -77,7 +67,7 @@ impl CommandCoherence<'_> {
             }
         };
 
-        event
+        event_fix
             .and_then(|e| validate_event_coherence(&self.db, e))
             .await
     }

src/commands/converter.rs

@@ -1,3 +1,5 @@
+use super::coherence::strip_prefixes;
+use super::partition;
 use crate::{
     db::Database,
     models::commands::{
@@ -9,7 +11,6 @@ use anyhow::Result;
 use futures::stream::{self, StreamExt, TryStreamExt};
 use itertools::{Either, Itertools};
 use std::convert::TryFrom;
-use super::coherence::strip_prefixes;
 
 use strum::VariantNames;
 
@@ -85,15 +86,9 @@ pub async fn convert_raw_execution(
         });
 
     // Coherence validation of converted events.
-    let (successes, incoherent_events): (Vec<_>, Vec<_>) = stream::iter(converted.into_iter())
-        .then(|event| validate_event_coherence(db, event))
-        .collect::<Vec<_>>()
-        .await
-        .into_iter()
-        .partition_map(|res| match res {
-            Ok(event) => Either::Left(event),
-            Err(err) => Either::Right(err),
-        });
+    let (successes, incoherent_events) = partition!(
+        stream::iter(converted.into_iter()).then(|event| validate_event_coherence(db, event))
+    );
 
     let failure_len = conversion_failures.len() + incoherent_events.len();
 

src/commands/mod.rs

@@ -12,6 +12,27 @@ use crate::{
 use anyhow::Result;
 use std::rc::Rc;
 
+/// Splits up a stream of results into successes and failures.
+macro_rules! partition {
+    ($stream: expr) => {
+        $stream
+            .fold(
+                (vec![], vec![]),
+                |(mut successes, mut failures), res| async {
+                    match res {
+                        Ok(event) => successes.push(event),
+                        Err(err) => failures.push(err),
+                    };
+
+                    (successes, failures)
+                },
+            )
+            .await
+    };
+}
+
+pub(self) use partition;
+
 pub mod builtins;
 pub mod coherence;
 pub mod converter;