Support including Taskfiles

Taskfile.yml

@@ -23,7 +23,7 @@ tasks:
     desc: Downloads cli dependencies
     cmds:
       - task: go-get
-        vars: {REPO: github.com/golang/lint/golint}
+        vars: {REPO: golang.org/x/lint/golint}
       - task: go-get
         vars: {REPO: github.com/golang/dep/cmd/dep}
       - task: go-get
@@ -68,7 +68,7 @@ tasks:
   ci:
     cmds:
       - task: go-get
-        vars: {REPO: github.com/golang/lint/golint}
+        vars: {REPO: golang.org/x/lint/golint}
       - task: lint
       - task: test
 

docs/taskfile_versions.md

@@ -128,5 +128,21 @@ tasks:
     ignore_error: true
 ```
 
-[output]: https://github.com/go-task/task#output-syntax
-[ignore_errors]: https://github.com/go-task/task#ignore-errors
+## Version 2.2
+
+Version 2.2 comes with a global `includes` options to include other
+Taskfiles:
+
+```yaml
+version: '2'
+
+includes:
+  docs: ./documentation # will look for ./documentation/Taskfile.yml
+  docker: ./DockerTasks.yml
+```
+
+Please check the [documentation][includes]
+
+[output]: usage#output-syntax
+[ignore_errors]: usage#ignore-errors
+[includes]: usage#including-other-taskfiles

docs/usage.md

@@ -48,7 +48,7 @@ tasks:
       hallo: welt
 ```
 
-## OS specific task
+## Operating System specific tasks
 
 If you add a `Taskfile_{{GOOS}}.yml` you can override or amend your Taskfile
 based on the operating system.
@@ -86,6 +86,31 @@ It's also possible to have an OS specific `Taskvars.yml` file, like
 `Taskvars_windows.yml`, `Taskfile_linux.yml`, or `Taskvars_darwin.yml`. See the
 [variables section](#variables) below.
 
+## Including other Taskfiles
+
+If you want to share tasks between different projects (Taskfiles), you can use
+the importing mechanism to include other Taskfiles using the `includes` keyword:
+
+```yaml
+version: '2'
+
+includes:
+  docs: ./documentation # will look for ./documentation/Taskfile.yml
+  docker: ./DockerTasks.yml
+```
+
+The tasks described in the given Taskfiles will be available with the informed
+namespace. So, you'd call `task docs:serve` to run the `serve` task from
+`documentation/Taskfile.yml` or `task docker:build` to run the `build` task
+from the `DockerTasks.yml` file.
+
+> The included Taskfiles must be using the same schema version the main
+> Taskfile uses.
+
+> Also, for now included Taskfiles can't include other Taskfiles.
+> This was a deliberate decision to keep use and implementation simple.
+> If you disagree, open an GitHub issue and explain your use case. =)
+
 ## Task directory
 
 By default, tasks will be executed in the directory where the Taskfile is

internal/taskfile/merge.go

@@ -2,10 +2,14 @@ package taskfile
 
 import (
 	"fmt"
+	"strings"
 )
 
+// NamespaceSeparator contains the character that separates namescapes
+const NamespaceSeparator = ":"
+
 // Merge merges the second Taskfile into the first
-func Merge(t1, t2 *Taskfile) error {
+func Merge(t1, t2 *Taskfile, namespaces ...string) error {
 	if t1.Version != t2.Version {
 		return fmt.Errorf(`Taskfiles versions should match. First is "%s" but second is "%s"`, t1.Version, t2.Version)
 	}
@@ -16,12 +20,19 @@ func Merge(t1, t2 *Taskfile) error {
 	if t2.Output != "" {
 		t1.Output = t2.Output
 	}
+	for k, v := range t2.Includes {
+		t1.Includes[k] = v
+	}
 	for k, v := range t2.Vars {
 		t1.Vars[k] = v
 	}
 	for k, v := range t2.Tasks {
-		t1.Tasks[k] = v
+		t1.Tasks[taskNameWithNamespace(k, namespaces...)] = v
 	}
 
 	return nil
 }
+
+func taskNameWithNamespace(taskName string, namespaces ...string) string {
+	return strings.Join(append(namespaces, taskName), NamespaceSeparator)
+}

internal/taskfile/read/taskfile.go

@@ -1,6 +1,7 @@
 package read
 
 import (
+	"errors"
 	"fmt"
 	"os"
 	"path/filepath"
@@ -11,6 +12,9 @@ import (
 	"gopkg.in/yaml.v2"
 )
 
+// ErrIncludedTaskfilesCantHaveIncludes is returned when a included Taskfile contains includes
+var ErrIncludedTaskfilesCantHaveIncludes = errors.New("task: Included Taskfiles can't have includes. Please, move the include to the main Taskfile")
+
 // Taskfile reads a Taskfile for a given directory
 func Taskfile(dir string) (*taskfile.Taskfile, error) {
 	path := filepath.Join(dir, "Taskfile.yml")
@@ -22,6 +26,27 @@ func Taskfile(dir string) (*taskfile.Taskfile, error) {
 		return nil, err
 	}
 
+	for namespace, path := range t.Includes {
+		path = filepath.Join(dir, path)
+		info, err := os.Stat(path)
+		if err != nil {
+			return nil, err
+		}
+		if info.IsDir() {
+			path = filepath.Join(path, "Taskfile.yml")
+		}
+		includedTaskfile, err := readTaskfile(path)
+		if err != nil {
+			return nil, err
+		}
+		if len(includedTaskfile.Includes) > 0 {
+			return nil, ErrIncludedTaskfilesCantHaveIncludes
+		}
+		if err = taskfile.Merge(t, includedTaskfile, namespace); err != nil {
+			return nil, err
+		}
+	}
+
 	path = filepath.Join(dir, fmt.Sprintf("Taskfile_%s.yml", runtime.GOOS))
 	if _, err = os.Stat(path); err == nil {
 		osTaskfile, err := readTaskfile(path)

internal/taskfile/taskfile.go

@@ -5,6 +5,7 @@ type Taskfile struct {
 	Version    string
 	Expansions int
 	Output     string
+	Includes   map[string]string
 	Vars       Vars
 	Tasks      Tasks
 }
@@ -20,6 +21,7 @@ func (tf *Taskfile) UnmarshalYAML(unmarshal func(interface{}) error) error {
 		Version    string
 		Expansions int
 		Output     string
+		Includes   map[string]string
 		Vars       Vars
 		Tasks      Tasks
 	}
@@ -29,6 +31,7 @@ func (tf *Taskfile) UnmarshalYAML(unmarshal func(interface{}) error) error {
 	tf.Version = taskfile.Version
 	tf.Expansions = taskfile.Expansions
 	tf.Output = taskfile.Output
+	tf.Includes = taskfile.Includes
 	tf.Vars = taskfile.Vars
 	tf.Tasks = taskfile.Tasks
 	if tf.Expansions <= 0 {

internal/taskfile/version/version.go

@@ -9,6 +9,7 @@ var (
 	v2  = mustVersion("2")
 	v21 = mustVersion("2.1")
 	v22 = mustVersion("2.2")
+	v23 = mustVersion("2.3")
 )
 
 // IsV1 returns if is a given Taskfile version is version 1
@@ -31,6 +32,11 @@ func IsV22(v *semver.Constraints) bool {
 	return v.Check(v22)
 }
 
+// IsV23 returns if is a given Taskfile version is at least version 2.3
+func IsV23(v *semver.Constraints) bool {
+	return v.Check(v23)
+}
+
 func mustVersion(s string) *semver.Version {
 	v, err := semver.NewVersion(s)
 	if err != nil {

task.go

@@ -116,21 +116,24 @@ func (e *Executor) Setup() error {
 			Vars:   e.taskvars,
 			Logger: e.Logger,
 		}
-	case version.IsV2(v), version.IsV21(v):
+	case version.IsV2(v), version.IsV21(v), version.IsV22(v):
 		e.Compiler = &compilerv2.CompilerV2{
 			Dir:          e.Dir,
 			Taskvars:     e.taskvars,
 			TaskfileVars: e.Taskfile.Vars,
 			Expansions:   e.Taskfile.Expansions,
 			Logger:       e.Logger,
 		}
-	case version.IsV22(v):
-		return fmt.Errorf(`task: Taskfile versions greater than v2.1 not implemented in the version of Task`)
+	case version.IsV23(v):
+		return fmt.Errorf(`task: Taskfile versions greater than v2.3 not implemented in the version of Task`)
 	}
 
 	if !version.IsV21(v) && e.Taskfile.Output != "" {
 		return fmt.Errorf(`task: Taskfile option "output" is only available starting on Taskfile version v2.1`)
 	}
+	if !version.IsV22(v) && len(e.Taskfile.Includes) > 0 {
+		return fmt.Errorf(`task: Including Taskfiles is only available starting on Taskfile version v2.2`)
+	}
 	switch e.Taskfile.Output {
 	case "", "interleaved":
 		e.Output = output.Interleaved{}

task_test.go

@@ -470,3 +470,17 @@ func TestDry(t *testing.T) {
 		t.Errorf("File should not exist %s", file)
 	}
 }
+
+func TestIncludes(t *testing.T) {
+	tt := fileContentTest{
+		Dir:       "testdata/includes",
+		Target:    "default",
+		TrimSpace: true,
+		Files: map[string]string{
+			"main.txt":               "main",
+			"included_directory.txt": "included_directory",
+			"included_taskfile.txt":  "included_taskfile",
+		},
+	}
+	tt.Run(t)
+}

testdata/includes/.gitignore

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

testdata/includes/Taskfile.yml

@@ -0,0 +1,16 @@
+version: '2'
+
+includes:
+  included: ./included
+  included_taskfile: ./Taskfile2.yml
+
+tasks:
+  default:
+    cmds:
+      - task: gen
+      - task: included:gen
+      - task: included_taskfile:gen
+
+  gen:
+    cmds:
+      - echo main > main.txt

testdata/includes/Taskfile2.yml

@@ -0,0 +1,6 @@
+version: '2'
+
+tasks:
+  gen:
+    cmds:
+      - echo included_taskfile > included_taskfile.txt

testdata/includes/included/Taskfile.yml

@@ -0,0 +1,6 @@
+version: '2'
+
+tasks:
+  gen:
+    cmds:
+      - echo included_directory > included_directory.txt