Allow evaluating justfiles with no recipes (#794)

src/justfile.rs

@@ -61,23 +61,6 @@ impl<'src> Justfile<'src> {
     overrides: &'run BTreeMap<String, String>,
     arguments: &'run [String],
   ) -> RunResult<'run, ()> {
-    let argvec: Vec<&str> = if !arguments.is_empty() {
-      arguments.iter().map(String::as_str).collect()
-    } else if let Some(recipe) = self.first() {
-      let min_arguments = recipe.min_arguments();
-      if min_arguments > 0 {
-        return Err(RuntimeError::DefaultRecipeRequiresArguments {
-          recipe: recipe.name.lexeme(),
-          min_arguments,
-        });
-      }
-      vec![recipe.name()]
-    } else {
-      return Err(RuntimeError::NoRecipes);
-    };
-
-    let arguments = argvec.as_slice();
-
     let unknown_overrides = overrides
       .keys()
       .filter(|name| !self.assignments.contains_key(name.as_str()))
@@ -142,6 +125,23 @@ impl<'src> Justfile<'src> {
       return Ok(());
     }
 
+    let argvec: Vec<&str> = if !arguments.is_empty() {
+      arguments.iter().map(String::as_str).collect()
+    } else if let Some(recipe) = self.first() {
+      let min_arguments = recipe.min_arguments();
+      if min_arguments > 0 {
+        return Err(RuntimeError::DefaultRecipeRequiresArguments {
+          recipe: recipe.name.lexeme(),
+          min_arguments,
+        });
+      }
+      vec![recipe.name()]
+    } else {
+      return Err(RuntimeError::NoRecipes);
+    };
+
+    let arguments = argvec.as_slice();
+
     let mut missing = vec![];
     let mut grouped = vec![];
     let mut rest = arguments;

tests/evaluate.rs

@@ -0,0 +1,29 @@
+test! {
+  name:     evaluate,
+  justfile: r#"
+foo := "a\t"
+hello := "c"
+bar := "b\t"
+ab := foo + bar + hello
+
+wut:
+  touch /this/is/not/a/file
+"#,
+  args:     ("--evaluate"),
+  stdout:   r#"ab    := "a	b	c"
+bar   := "b	"
+foo   := "a	"
+hello := "c"
+"#,
+}
+
+test! {
+  name:     evaluate_empty,
+  justfile: "
+    a := 'foo'
+  ",
+  args:     ("--evaluate"),
+  stdout:   r#"
+    a := "foo"
+  "#,
+}

tests/lib.rs

@@ -10,6 +10,7 @@ mod delimiters;
 mod dotenv;
 mod edit;
 mod error_messages;
+mod evaluate;
 mod examples;
 mod export;
 mod init;

tests/misc.rs

@@ -569,25 +569,6 @@ echo `echo command interpolation`
 ",
 }
 
-test! {
-  name:     evaluate,
-  justfile: r#"
-foo := "a\t"
-hello := "c"
-bar := "b\t"
-ab := foo + bar + hello
-
-wut:
-  touch /this/is/not/a/file
-"#,
-  args:     ("--evaluate"),
-  stdout:   r#"ab    := "a	b	c"
-bar   := "b	"
-foo   := "a	"
-hello := "c"
-"#,
-}
-
 test! {
   name:     line_error_spacing,
   justfile: r#"