feat(task): add --eval flag (#26943)

This commit adds `--eval` flag to `deno task` subcommand.

This flag allows to evaluate provided "task name" as a task itself,
effectively allowing to use `deno_task_shell` from the command line.

Also fixes shebang parsing for `node_modules/.bin/` entries to handle
`#!/usr/bin/node -S node` in addition to `#!/usr/bin/node node`.

Closes https://github.com/denoland/deno/issues/26918

cli/args/flags.rs

@@ -380,6 +380,7 @@ pub struct TaskFlags {
   pub cwd: Option<String>,
   pub task: Option<String>,
   pub is_run: bool,
+  pub eval: bool,
 }
 
 #[derive(Clone, Copy, Debug, Default, Eq, PartialEq)]
@@ -1386,7 +1387,7 @@ pub fn flags_from_vec(args: Vec<OsString>) -> clap::error::Result<Flags> {
       "repl" => repl_parse(&mut flags, &mut m)?,
       "run" => run_parse(&mut flags, &mut m, app, false)?,
       "serve" => serve_parse(&mut flags, &mut m, app)?,
-      "task" => task_parse(&mut flags, &mut m),
+      "task" => task_parse(&mut flags, &mut m, app)?,
       "test" => test_parse(&mut flags, &mut m)?,
       "types" => types_parse(&mut flags, &mut m),
       "uninstall" => uninstall_parse(&mut flags, &mut m),
@@ -2931,7 +2932,10 @@ fn task_subcommand() -> Command {
   <p(245)>deno task build</>
 
 List all available tasks:
-  <p(245)>deno task</>"
+  <p(245)>deno task</>
+  
+Evaluate a task from string
+  <p(245)>deno task --eval \"echo $(pwd)\"</>"
     ),
     UnstableArgsConfig::ResolutionAndRuntime,
   )
@@ -2947,6 +2951,13 @@ List all available tasks:
           .help("Specify the directory to run the task in")
           .value_hint(ValueHint::DirPath),
       )
+      .arg(
+        Arg::new("eval")
+          .long("eval")
+          .help(
+            "Evaluate the passed value as if, it was a task in a configuration file",
+          ).action(ArgAction::SetTrue)
+        )
       .arg(node_modules_dir_arg())
   })
 }
@@ -5066,7 +5077,11 @@ fn serve_parse(
   Ok(())
 }
 
-fn task_parse(flags: &mut Flags, matches: &mut ArgMatches) {
+fn task_parse(
+  flags: &mut Flags,
+  matches: &mut ArgMatches,
+  mut app: Command,
+) -> clap::error::Result<()> {
   flags.config_flag = matches
     .remove_one::<String>("config")
     .map(ConfigFlag::Path)
@@ -5079,6 +5094,7 @@ fn task_parse(flags: &mut Flags, matches: &mut ArgMatches) {
     cwd: matches.remove_one::<String>("cwd"),
     task: None,
     is_run: false,
+    eval: matches.get_flag("eval"),
   };
 
   if let Some((task, mut matches)) = matches.remove_subcommand() {
@@ -5091,9 +5107,15 @@ fn task_parse(flags: &mut Flags, matches: &mut ArgMatches) {
         .flatten()
         .filter_map(|arg| arg.into_string().ok()),
     );
+  } else if task_flags.eval {
+    return Err(app.find_subcommand_mut("task").unwrap().error(
+      clap::error::ErrorKind::MissingRequiredArgument,
+      "[TASK] must be specified when using --eval",
+    ));
   }
 
   flags.subcommand = DenoSubcommand::Task(task_flags);
+  Ok(())
 }
 
 fn parallel_arg_parse(matches: &mut ArgMatches) -> Option<NonZeroUsize> {
@@ -10274,6 +10296,7 @@ mod tests {
           cwd: None,
           task: Some("build".to_string()),
           is_run: false,
+          eval: false,
         }),
         argv: svec!["hello", "world"],
         ..Flags::default()
@@ -10288,6 +10311,7 @@ mod tests {
           cwd: None,
           task: Some("build".to_string()),
           is_run: false,
+          eval: false,
         }),
         ..Flags::default()
       }
@@ -10301,10 +10325,28 @@ mod tests {
           cwd: Some("foo".to_string()),
           task: Some("build".to_string()),
           is_run: false,
+          eval: false,
         }),
         ..Flags::default()
       }
     );
+
+    let r = flags_from_vec(svec!["deno", "task", "--eval", "echo 1"]);
+    assert_eq!(
+      r.unwrap(),
+      Flags {
+        subcommand: DenoSubcommand::Task(TaskFlags {
+          cwd: None,
+          task: Some("echo 1".to_string()),
+          is_run: false,
+          eval: true,
+        }),
+        ..Flags::default()
+      }
+    );
+
+    let r = flags_from_vec(svec!["deno", "task", "--eval"]);
+    assert!(r.is_err());
   }
 
   #[test]
@@ -10326,6 +10368,7 @@ mod tests {
           cwd: None,
           task: Some("build".to_string()),
           is_run: false,
+          eval: false,
         }),
         argv: svec!["--", "hello", "world"],
         config_flag: ConfigFlag::Path("deno.json".to_owned()),
@@ -10343,6 +10386,7 @@ mod tests {
           cwd: Some("foo".to_string()),
           task: Some("build".to_string()),
           is_run: false,
+          eval: false,
         }),
         argv: svec!["--", "hello", "world"],
         ..Flags::default()
@@ -10361,6 +10405,7 @@ mod tests {
           cwd: None,
           task: Some("build".to_string()),
           is_run: false,
+          eval: false,
         }),
         argv: svec!["--"],
         ..Flags::default()
@@ -10378,6 +10423,7 @@ mod tests {
           cwd: None,
           task: Some("build".to_string()),
           is_run: false,
+          eval: false,
         }),
         argv: svec!["-1", "--test"],
         ..Flags::default()
@@ -10395,6 +10441,7 @@ mod tests {
           cwd: None,
           task: Some("build".to_string()),
           is_run: false,
+          eval: false,
         }),
         argv: svec!["--test"],
         ..Flags::default()
@@ -10413,6 +10460,7 @@ mod tests {
           cwd: None,
           task: Some("build".to_string()),
           is_run: false,
+          eval: false,
         }),
         log_level: Some(log::Level::Error),
         ..Flags::default()
@@ -10430,6 +10478,7 @@ mod tests {
           cwd: None,
           task: None,
           is_run: false,
+          eval: false,
         }),
         ..Flags::default()
       }
@@ -10446,6 +10495,7 @@ mod tests {
           cwd: None,
           task: None,
           is_run: false,
+          eval: false,
         }),
         config_flag: ConfigFlag::Path("deno.jsonc".to_string()),
         ..Flags::default()
@@ -10463,6 +10513,7 @@ mod tests {
           cwd: None,
           task: None,
           is_run: false,
+          eval: false,
         }),
         config_flag: ConfigFlag::Path("deno.jsonc".to_string()),
         ..Flags::default()

cli/main.rs

@@ -238,6 +238,7 @@ async fn run_subcommand(flags: Arc<Flags>) -> Result<i32, AnyError> {
                   cwd: None,
                   task: Some(run_flags.script.clone()),
                   is_run: true,
+                  eval: false,
                 };
                 new_flags.subcommand = DenoSubcommand::Task(task_flags.clone());
                 let result = tools::task::execute_script(Arc::new(new_flags), task_flags.clone()).await;

cli/task_runner.rs

@@ -483,10 +483,23 @@ fn resolve_execution_path_from_npx_shim(
   static SCRIPT_PATH_RE: Lazy<Regex> =
     lazy_regex::lazy_regex!(r#""\$basedir\/([^"]+)" "\$@""#);
 
-  if text.starts_with("#!/usr/bin/env node") {
+  let maybe_first_line = {
+    let index = text.find("\n")?;
+    Some(&text[0..index])
+  };
+
+  if let Some(first_line) = maybe_first_line {
+    // NOTE(bartlomieju): this is not perfect, but handle two most common scenarios
+    // where Node is run without any args. If there are args then we use `NodeCommand`
+    // struct.
+    if first_line == "#!/usr/bin/env node"
+      || first_line == "#!/usr/bin/env -S node"
+    {
       // launch this file itself because it's a JS file
-    Some(file_path)
+      return Some(file_path);
-  } else {
+    }
+  }
+
   // Search for...
   // > "$basedir/../next/dist/bin/next" "$@"
   // ...which is what it will look like on Windows
@@ -496,7 +509,6 @@ fn resolve_execution_path_from_npx_shim(
     .map(|relative_path| {
       file_path.parent().unwrap().join(relative_path.as_str())
     })
-  }
 }
 
 fn resolve_managed_npm_commands(
@@ -564,6 +576,16 @@ mod test {
     let unix_shim = r#"#!/usr/bin/env node
 "use strict";
 console.log('Hi!');
+"#;
+    let path = PathBuf::from("/node_modules/.bin/example");
+    assert_eq!(
+      resolve_execution_path_from_npx_shim(path.clone(), unix_shim).unwrap(),
+      path
+    );
+    // example shim on unix
+    let unix_shim = r#"#!/usr/bin/env -S node
+"use strict";
+console.log('Hi!');
 "#;
     let path = PathBuf::from("/node_modules/.bin/example");
     assert_eq!(

cli/tools/task.rs

@@ -42,7 +42,7 @@ pub async fn execute_script(
   let factory = CliFactory::from_flags(flags);
   let cli_options = factory.cli_options()?;
   let start_dir = &cli_options.start_dir;
-  if !start_dir.has_deno_or_pkg_json() {
+  if !start_dir.has_deno_or_pkg_json() && !task_flags.eval {
     bail!("deno task couldn't find deno.json(c). See https://docs.deno.com/go/config")
   }
   let force_use_pkg_json =
@@ -90,6 +90,19 @@ pub async fn execute_script(
     concurrency: no_of_concurrent_tasks.into(),
   };
 
+  if task_flags.eval {
+    return task_runner
+      .run_deno_task(
+        &Url::from_directory_path(cli_options.initial_cwd()).unwrap(),
+        &"".to_string(),
+        &TaskDefinition {
+          command: task_flags.task.as_ref().unwrap().to_string(),
+          dependencies: vec![],
+          description: None,
+        },
+      )
+      .await;
+  }
   task_runner.run_task(task_name).await
 }
 

tests/specs/task/eval/__test__.jsonc

@@ -0,0 +1,35 @@
+{
+  "tests": {
+    "no_arg": {
+      "args": "task --eval",
+      "output": "no_arg.out",
+      "exitCode": 1
+    },
+    "echo_pwd": {
+      "args": ["task", "--eval", "echo $(pwd)"],
+      "output": "echo_pwd.out"
+    },
+    "piped": {
+      "args": [
+        "task",
+        "--eval",
+        "echo 12345 | (deno eval 'const b = new Uint8Array(1);Deno.stdin.readSync(b);console.log(b)' && deno eval 'const b = new Uint8Array(1);Deno.stdin.readSync(b);console.log(b)')"
+      ],
+      "output": "piped.out"
+    },
+    "node_modules_bin": {
+      "tempDir": true,
+      "steps": [{
+        "args": "install",
+        "output": "[WILDCARD]Initialize @denotest/bin[WILDCARD]"
+      }, {
+        "args": [
+          "task",
+          "--eval",
+          "cli-esm hi hello"
+        ],
+        "output": "bin.out"
+      }]
+    }
+  }
+}

tests/specs/task/eval/bin.out

@@ -0,0 +1,3 @@
+Task  cli-esm hi hello
+hi
+hello

tests/specs/task/eval/echo_pwd.out

@@ -0,0 +1,2 @@
+Task  echo $(pwd)
+[WILDCARD]

tests/specs/task/eval/no_arg.out

@@ -0,0 +1,4 @@
+error: [TASK] must be specified when using --eval
+
+Usage: deno task [OPTIONS] [TASK]
+

tests/specs/task/eval/package.json

@@ -0,0 +1,9 @@
+{
+  "name": "bin_package",
+  "devDependencies": {
+    "@denotest/bin": "1.0.0"
+  },
+  "scripts": {
+    "sayhi": "cli-esm hi hello"
+  }
+}

tests/specs/task/eval/piped.out

@@ -0,0 +1,3 @@
+Task  echo 12345 | (deno eval 'const b = new Uint8Array(1);Deno.stdin.readSync(b);console.log(b)' && deno eval 'const b = new Uint8Array(1);Deno.stdin.readSync(b);console.log(b)')
+Uint8Array(1) [ 49 ]
+Uint8Array(1) [ 50 ]