feat: deno run <task> (#24891)

This PR updates `deno run` to fallback to executing tasks when there is
no script with the specified name. If there are both script and a task
with the same name then `deno run` will prioritise executing the script.

cli/main.rs

@@ -37,6 +37,7 @@ use crate::util::display;
 use crate::util::v8::get_v8_flags_from_env;
 use crate::util::v8::init_v8_flags;
 
+use args::TaskFlags;
 use deno_runtime::WorkerExecutionMode;
 pub use deno_runtime::UNSTABLE_GRANULAR_FLAGS;
 
@@ -50,8 +51,10 @@ use deno_runtime::fmt_errors::format_js_error;
 use deno_runtime::tokio_util::create_and_run_current_thread_with_maybe_metrics;
 use deno_terminal::colors;
 use factory::CliFactory;
+use standalone::MODULE_NOT_FOUND;
 use std::env;
 use std::future::Future;
+use std::ops::Deref;
 use std::path::PathBuf;
 use std::sync::Arc;
 
@@ -177,16 +180,39 @@ async fn run_subcommand(flags: Arc<Flags>) -> Result<i32, AnyError> {
     }
     DenoSubcommand::Run(run_flags) => spawn_subcommand(async move {
       if run_flags.is_stdin() {
-        tools::run::run_from_stdin(flags).await
+        tools::run::run_from_stdin(flags.clone()).await
       } else {
-        tools::run::run_script(WorkerExecutionMode::Run, flags, run_flags.watch).await
+        let result = tools::run::run_script(WorkerExecutionMode::Run, flags.clone(), run_flags.watch).await;
+       match result {
+         Ok(v) =>  Ok(v),
+         Err(script_err) => {
+          if script_err.to_string().starts_with(MODULE_NOT_FOUND) {
+            let mut new_flags = flags.deref().clone();
+            let task_flags = TaskFlags {
+                cwd: None,
+                task: Some(run_flags.script.clone()),
+            };
+            new_flags.subcommand = DenoSubcommand::Task(task_flags.clone());
+            let result  = tools::task::execute_script(Arc::new(new_flags), task_flags.clone(), true).await;
+            match result {
+              Ok(v) => Ok(v),
+              Err(_) => {
+                  // Return script error for backwards compatibility.
+                  Err(script_err)
+              }
+            }
+          } else {
+            Err(script_err)
+          }
+         },
+       }
       }
     }),
     DenoSubcommand::Serve(serve_flags) => spawn_subcommand(async move {
       tools::run::run_script(WorkerExecutionMode::Serve, flags, serve_flags.watch).await
     }),
     DenoSubcommand::Task(task_flags) => spawn_subcommand(async {
-      tools::task::execute_script(flags, task_flags).await
+      tools::task::execute_script(flags, task_flags, false).await
     }),
     DenoSubcommand::Test(test_flags) => {
       spawn_subcommand(async {

cli/standalone/mod.rs

@@ -131,6 +131,8 @@ struct EmbeddedModuleLoader {
   dynamic_permissions: PermissionsContainer,
 }
 
+pub const MODULE_NOT_FOUND: &str = "Module not found";
+
 impl ModuleLoader for EmbeddedModuleLoader {
   fn resolve(
     &self,
@@ -336,7 +338,7 @@ impl ModuleLoader for EmbeddedModuleLoader {
 
     let Some(module) = self.shared.eszip.get_module(original_specifier) else {
       return deno_core::ModuleLoadResponse::Sync(Err(type_error(format!(
-        "Module not found: {}",
+        "{MODULE_NOT_FOUND}: {}",
         original_specifier
       ))));
     };

cli/tools/task.rs

@@ -12,6 +12,7 @@ use deno_config::deno_json::Task;
 use deno_config::workspace::TaskOrScript;
 use deno_config::workspace::WorkspaceDirectory;
 use deno_config::workspace::WorkspaceTasksConfig;
+use deno_core::anyhow::anyhow;
 use deno_core::anyhow::bail;
 use deno_core::anyhow::Context;
 use deno_core::error::AnyError;
@@ -28,6 +29,7 @@ use std::sync::Arc;
 pub async fn execute_script(
   flags: Arc<Flags>,
   task_flags: TaskFlags,
+  using_run: bool,
 ) -> Result<i32, AnyError> {
   let factory = CliFactory::from_flags(flags);
   let cli_options = factory.cli_options()?;
@@ -140,7 +142,10 @@ pub async fn execute_script(
       }
     },
     None => {
-      log::error!("Task not found: {task_name}");
+      if using_run {
+        return Err(anyhow!("Task not found: {}", task_name));
+      }
+      log::error!("Task not found: {}", task_name);
       if log::log_enabled!(log::Level::Error) {
         print_available_tasks(
           &mut std::io::stderr(),

tests/specs/run/run_task/__test__.jsonc

@@ -0,0 +1,13 @@
+{
+  "tests": {
+    "deno_run_task": {
+      "args": "run main",
+      "output": "main.out"
+    },
+    "deno_run_module_task_not_found": {
+      "args": "run not_found",
+      "output": "not_found.out",
+      "exitCode": 1
+    }
+  }
+}

tests/specs/run/run_task/deno.json

@@ -0,0 +1,5 @@
+{
+  "tasks": {
+    "main": "deno run main.ts"
+  }
+}

tests/specs/run/run_task/main.out

@@ -0,0 +1,2 @@
+Task main deno run main.ts
+main

tests/specs/run/run_task/main.ts

@@ -0,0 +1 @@
+console.log("main");

tests/specs/run/run_task/not_found.out

@@ -0,0 +1 @@
+error: Module not found "file:///[WILDCARD]/not_found".