driver: introduce task priority field

Override the version-based task priority ordering.

2 files changed, 14 insertions, 6 deletions

diff --git a/crates/driver/src/context.rs b/crates/driver/src/context.rs
index fb0ea96..5564c86 100644
--- a/crates/driver/src/context.rs
+++ b/crates/driver/src/context.rs
@@ -1,5 +1,6 @@
 use std::{
 	borrow::Cow,
+	cmp::Ordering,
 	collections::{HashMap, HashSet},
 	fmt::Display,
 	hash::Hash,
@@ -273,16 +274,21 @@ impl Context {
 			.all(|(key, value)| args.get(key) == Some(value))
 	}
 
+	fn compare_tasks(task1: &TaskDef, task2: &TaskDef) -> Ordering {
+		task1
+			.priority
+			.cmp(&task2.priority)
+			.then(deb_version::compare_versions(
+				task1.meta.version.as_deref().unwrap_or_default(),
+				task2.meta.version.as_deref().unwrap_or_default(),
+			))
+	}
+
 	fn select_task<'ctx>(tasks: &'ctx [TaskDef], args: &TaskArgs) -> Option<&'ctx TaskDef> {
 		tasks
 			.iter()
 			.filter(|task| Self::match_task(task, args))
-			.max_by(|task1, task2| {
-				deb_version::compare_versions(
-					task1.meta.version.as_deref().unwrap_or_default(),
-					task2.meta.version.as_deref().unwrap_or_default(),
-				)
-			})
+			.max_by(|task1, task2| Self::compare_tasks(task1, task2))
 	}
 
 	fn get_with_args<'ctx>(&'ctx self, id: &'ctx TaskID, args: &TaskArgs) -> Result<&TaskDef> {
diff --git a/crates/driver/src/task.rs b/crates/driver/src/task.rs
index 51557ae..df3bc68 100644
--- a/crates/driver/src/task.rs
+++ b/crates/driver/src/task.rs
@@ -87,6 +87,8 @@ pub struct TaskDef {
 	pub output: HashMap<String, Output>,
 	#[serde(flatten)]
 	pub action: Action,
+	#[serde(default)]
+	pub priority: i32,
 	#[serde(skip)]
 	pub arg_match: TaskArgs,
 }