feat: add option to declare an included Taskfile as flatten

.editorconfig

@@ -8,6 +8,6 @@ charset = utf-8
 trim_trailing_whitespace = true
 indent_style = tab
 
-[*.{md,yml,yaml,json,toml,htm,html,js,css,svg,sh,bash,fish}]
+[*.{md,mdx,yml,yaml,json,toml,htm,html,js,css,svg,sh,bash,fish}]
 indent_style = space
 indent_size = 2

errors/errors_task.go

@@ -80,6 +80,19 @@ func (err *TaskNameConflictError) Code() int {
 	return CodeTaskNameConflict
 }
 
+type TaskNameFlattenConflictError struct {
+	TaskName string
+	Include  string
+}
+
+func (err *TaskNameFlattenConflictError) Error() string {
+	return fmt.Sprintf(`task: Found multiple tasks (%s) included by "%s""`, err.TaskName, err.Include)
+}
+
+func (err *TaskNameFlattenConflictError) Code() int {
+	return CodeTaskNameConflict
+}
+
 // TaskCalledTooManyTimesError is returned when the maximum task call limit is
 // exceeded. This is to prevent infinite loops and cyclic dependencies.
 type TaskCalledTooManyTimesError struct {

task_test.go

@@ -1230,6 +1230,43 @@ func TestIncludesInternal(t *testing.T) {
 	}
 }
 
+func TestIncludesFlatten(t *testing.T) {
+	const dir = "testdata/includes_flatten"
+	tests := []struct {
+		name           string
+		taskfile       string
+		task           string
+		expectedErr    bool
+		expectedOutput string
+	}{
+		{name: "included flatten", taskfile: "Taskfile.yml", task: "gen", expectedOutput: "gen from included\n"},
+		{name: "included flatten with deps", taskfile: "Taskfile.yml", task: "with_deps", expectedOutput: "gen from included\nwith_deps from included\n"},
+		{name: "included flatten nested", taskfile: "Taskfile.yml", task: "from_nested", expectedOutput: "from nested\n"},
+		{name: "included flatten multiple same task", taskfile: "Taskfile.multiple.yml", task: "gen", expectedErr: true, expectedOutput: "task: Found multiple tasks (gen) included by \"included\"\""},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			var buff bytes.Buffer
+			e := task.Executor{
+				Dir:        dir,
+				Entrypoint: dir + "/" + test.taskfile,
+				Stdout:     &buff,
+				Stderr:     &buff,
+				Silent:     true,
+			}
+			err := e.Setup()
+			if test.expectedErr {
+				assert.EqualError(t, err, test.expectedOutput)
+			} else {
+				require.NoError(t, err)
+				_ = e.Run(context.Background(), &ast.Call{Task: test.task})
+				assert.Equal(t, test.expectedOutput, buff.String())
+			}
+		})
+	}
+}
+
 func TestIncludesInterpolation(t *testing.T) {
 	const dir = "testdata/includes_interpolation"
 	tests := []struct {

taskfile/ast/include.go

@@ -17,6 +17,7 @@ type Include struct {
 	Aliases        []string
 	AdvancedImport bool
 	Vars           *Vars
+	Flatten        bool
 }
 
 // Includes represents information about included tasksfiles
@@ -81,6 +82,7 @@ func (include *Include) UnmarshalYAML(node *yaml.Node) error {
 			Dir      string
 			Optional bool
 			Internal bool
+			Flatten  bool
 			Aliases  []string
 			Vars     *Vars
 		}
@@ -94,6 +96,7 @@ func (include *Include) UnmarshalYAML(node *yaml.Node) error {
 		include.Aliases = includedTaskfile.Aliases
 		include.AdvancedImport = true
 		include.Vars = includedTaskfile.Vars
+		include.Flatten = includedTaskfile.Flatten
 		return nil
 	}
 
@@ -114,5 +117,6 @@ func (include *Include) DeepCopy() *Include {
 		Internal:       include.Internal,
 		AdvancedImport: include.AdvancedImport,
 		Vars:           include.Vars.DeepCopy(),
+		Flatten:        include.Flatten,
 	}
 }

taskfile/ast/taskfile.go

@@ -55,8 +55,7 @@ func (t1 *Taskfile) Merge(t2 *Taskfile, include *Include) error {
 	}
 	t1.Vars.Merge(t2.Vars, include)
 	t1.Env.Merge(t2.Env, include)
-	t1.Tasks.Merge(t2.Tasks, include, t1.Vars)
-	return nil
+	return t1.Tasks.Merge(t2.Tasks, include, t1.Vars)
 }
 
 func (tf *Taskfile) UnmarshalYAML(node *yaml.Node) error {

taskfile/ast/tasks.go

@@ -47,43 +47,48 @@ func (t *Tasks) FindMatchingTasks(call *Call) []*MatchingTask {
 	return matchingTasks
 }
 
-func (t1 *Tasks) Merge(t2 Tasks, include *Include, includedTaskfileVars *Vars) {
-	_ = t2.Range(func(name string, v *Task) error {
+func (t1 *Tasks) Merge(t2 Tasks, include *Include, includedTaskfileVars *Vars) error {
+	err := t2.Range(func(name string, v *Task) error {
 		// We do a deep copy of the task struct here to ensure that no data can
 		// be changed elsewhere once the taskfile is merged.
 		task := v.DeepCopy()
-
 		// Set the task to internal if EITHER the included task or the included
 		// taskfile are marked as internal
 		task.Internal = task.Internal || (include != nil && include.Internal)
-
-		// Add namespaces to task dependencies
-		for _, dep := range task.Deps {
-			if dep != nil && dep.Task != "" {
-				dep.Task = taskNameWithNamespace(dep.Task, include.Namespace)
+		taskName := name
+		if !include.Flatten {
+			// Add namespaces to task dependencies
+			for _, dep := range task.Deps {
+				if dep != nil && dep.Task != "" {
+					dep.Task = taskNameWithNamespace(dep.Task, include.Namespace)
+				}
 			}
-		}
 
-		// Add namespaces to task commands
-		for _, cmd := range task.Cmds {
-			if cmd != nil && cmd.Task != "" {
-				cmd.Task = taskNameWithNamespace(cmd.Task, include.Namespace)
+			// Add namespaces to task commands
+			for _, cmd := range task.Cmds {
+				if cmd != nil && cmd.Task != "" {
+					cmd.Task = taskNameWithNamespace(cmd.Task, include.Namespace)
+				}
 			}
-		}
 
-		// Add namespaces to task aliases
-		for i, alias := range task.Aliases {
-			task.Aliases[i] = taskNameWithNamespace(alias, include.Namespace)
-		}
+			// Add namespaces to task aliases
+			for i, alias := range task.Aliases {
+				task.Aliases[i] = taskNameWithNamespace(alias, include.Namespace)
+			}
 
-		// Add namespace aliases
-		if include != nil {
-			for _, namespaceAlias := range include.Aliases {
-				task.Aliases = append(task.Aliases, taskNameWithNamespace(task.Task, namespaceAlias))
-				for _, alias := range v.Aliases {
-					task.Aliases = append(task.Aliases, taskNameWithNamespace(alias, namespaceAlias))
+			// Add namespace aliases
+			if include != nil {
+				for _, namespaceAlias := range include.Aliases {
+					task.Aliases = append(task.Aliases, taskNameWithNamespace(task.Task, namespaceAlias))
+					for _, alias := range v.Aliases {
+						task.Aliases = append(task.Aliases, taskNameWithNamespace(alias, namespaceAlias))
+					}
 				}
 			}
+
+			taskName = taskNameWithNamespace(name, include.Namespace)
+			task.Namespace = include.Namespace
+			task.Task = taskName
 		}
 
 		if include.AdvancedImport {
@@ -95,11 +100,14 @@ func (t1 *Tasks) Merge(t2 Tasks, include *Include, includedTaskfileVars *Vars) {
 			task.IncludedTaskfileVars = includedTaskfileVars.DeepCopy()
 		}
 
+		if t1.Get(taskName) != nil {
+			return &errors.TaskNameFlattenConflictError{
+				TaskName: taskName,
+				Include:  include.Namespace,
+			}
+		}
 		// Add the task to the merged taskfile
-		taskNameWithNamespace := taskNameWithNamespace(name, include.Namespace)
-		task.Namespace = include.Namespace
-		task.Task = taskNameWithNamespace
-		t1.Set(taskNameWithNamespace, task)
+		t1.Set(taskName, task)
 
 		return nil
 	})
@@ -114,6 +122,7 @@ func (t1 *Tasks) Merge(t2 Tasks, include *Include, includedTaskfileVars *Vars) {
 		t1.Get(defaultTaskName).Aliases = append(t1.Get(defaultTaskName).Aliases, include.Namespace)
 		t1.Get(defaultTaskName).Aliases = slices.Concat(t1.Get(defaultTaskName).Aliases, include.Aliases)
 	}
+	return err
 }
 
 func (t *Tasks) UnmarshalYAML(node *yaml.Node) error {

taskfile/reader.go

@@ -109,6 +109,7 @@ func (r *Reader) include(node Node) error {
 				Dir:            templater.Replace(include.Dir, cache),
 				Optional:       include.Optional,
 				Internal:       include.Internal,
+				Flatten:        include.Flatten,
 				Aliases:        include.Aliases,
 				AdvancedImport: include.AdvancedImport,
 				Vars:           include.Vars,

testdata/includes_flatten/.gitignore

@@ -0,0 +1 @@
+*.txt

testdata/includes_flatten/Taskfile.multiple.yml

@@ -0,0 +1,12 @@
+version: '3'
+
+includes:
+  included:
+    taskfile: ./included
+    flatten: true
+
+tasks:
+  gen:
+    cmds:
+      - echo "gen multiple"
+

testdata/includes_flatten/Taskfile.yml

@@ -0,0 +1,13 @@
+version: '3'
+
+includes:
+  included:
+    taskfile: ./included
+    dir: ./included
+    flatten: true
+
+tasks:
+  default:
+    cmds:
+      - echo root_directory > root_directory.txt
+

testdata/includes_flatten/included/Taskfile.yml

@@ -0,0 +1,23 @@
+version: '3'
+
+includes:
+    nested:
+      taskfile: ../nested
+      flatten: true
+
+tasks:
+  gen:
+    cmds:
+      - echo "gen from included"
+
+  with_deps:
+    deps:
+        - gen
+    cmds:
+      - echo "with_deps from included"
+
+
+  pwd:
+    desc: Print working directory
+    cmds:
+      - pwd

testdata/includes_flatten/nested/Taskfile.yml

@@ -0,0 +1,6 @@
+version: '3'
+
+tasks:
+  from_nested:
+    cmds:
+      - echo "from nested"

website/docs/reference/schema.mdx

@@ -8,7 +8,7 @@ toc_max_heading_level: 5
 # Schema Reference
 
 | Attribute  | Type                               | Default       | Description                                                                                                                                                            |
-| ---------- | ---------------------------------- | ------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
+|------------|------------------------------------|---------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
 | `version`  | `string`                           |               | Version of the Taskfile. The current version is `3`.                                                                                                                   |
 | `output`   | `string`                           | `interleaved` | Output mode. Available options: `interleaved`, `group` and `prefixed`.                                                                                                 |
 | `method`   | `string`                           | `checksum`    | Default method in this Taskfile. Can be overridden in a task by task basis. Available options: `checksum`, `timestamp` and `none`.                                     |
@@ -26,10 +26,11 @@ toc_max_heading_level: 5
 ## Include
 
 | Attribute  | Type                  | Default                       | Description                                                                                                                                                                                                                                              |
-| ---------- | --------------------- | ----------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
+|------------|-----------------------|-------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
 | `taskfile` | `string`              |                               | The path for the Taskfile or directory to be included. If a directory, Task will look for files named `Taskfile.yml` or `Taskfile.yaml` inside that directory. If a relative path, resolved relative to the directory containing the including Taskfile. |
 | `dir`      | `string`              | The parent Taskfile directory | The working directory of the included tasks when run.                                                                                                                                                                                                    |
 | `optional` | `bool`                | `false`                       | If `true`, no errors will be thrown if the specified file does not exist.                                                                                                                                                                                |
+| `flatten`  | `bool`                | `false`                       | If `true`, the tasks from the included Taskfile will be available in the including Taskfile without a namespace. If a task with the same name already exists in the including Taskfile, an error will be thrown.                                         |
 | `internal` | `bool`                | `false`                       | Stops any task in the included Taskfile from being callable on the command line. These commands will also be omitted from the output when used with `--list`.                                                                                            |
 | `aliases`  | `[]string`            |                               | Alternative names for the namespace of the included Taskfile.                                                                                                                                                                                            |
 | `vars`     | `map[string]Variable` |                               | A set of variables to apply to the included Taskfile.                                                                                                                                                                                                    |