v3: Allow interpolation on "includes"

The idea is to allow manual inclusion of a OS-dependant Taskfile, since it's
not automatically included anymore.

internal/taskfile/read/taskfile.go

@@ -8,6 +8,7 @@ import (
 	"runtime"
 
 	"github.com/go-task/task/v2/internal/taskfile"
+	"github.com/go-task/task/v2/internal/templater"
 
 	"gopkg.in/yaml.v3"
 )
@@ -28,7 +29,24 @@ func Taskfile(dir string, entrypoint string) (*taskfile.Taskfile, error) {
 		return nil, err
 	}
 
+	v, err := t.ParsedVersion()
+	if err != nil {
+		return nil, err
+	}
+
 	for namespace, includedTask := range t.Includes {
+		if v >= 3.0 {
+			tr := templater.Templater{Vars: &taskfile.Vars{}, RemoveNoValue: true}
+			includedTask = taskfile.IncludedTaskfile{
+				Taskfile:       tr.Replace(includedTask.Taskfile),
+				Dir:            tr.Replace(includedTask.Dir),
+				AdvancedImport: includedTask.AdvancedImport,
+			}
+			if err := tr.Err(); err != nil {
+				return nil, err
+			}
+		}
+
 		if filepath.IsAbs(includedTask.Taskfile) {
 			path = includedTask.Taskfile
 		} else {
@@ -63,10 +81,6 @@ func Taskfile(dir string, entrypoint string) (*taskfile.Taskfile, error) {
 		}
 	}
 
-	v, err := t.ParsedVersion()
-	if err != nil {
-		return nil, err
-	}
 	if v < 3.0 {
 		path = filepath.Join(dir, fmt.Sprintf("Taskfile_%s.yml", runtime.GOOS))
 		if _, err = os.Stat(path); err == nil {

task_test.go

@@ -560,6 +560,7 @@ func TestIncludes(t *testing.T) {
 			"included_taskfile_without_dir.txt":         "included_taskfile_without_dir",
 			"./module2/included_directory_with_dir.txt": "included_directory_with_dir",
 			"./module2/included_taskfile_with_dir.txt":  "included_taskfile_with_dir",
+			"os_include.txt":                            "os",
 		},
 	}
 	tt.Run(t)

testdata/includes/Taskfile.yml

@@ -13,6 +13,7 @@ includes:
   included_taskfile_with_dir:
     taskfile:  ./module2/Taskfile.yml
     dir:  ./module2
+  included_os: ./Taskfile_{{OS}}.yml
 
 tasks:
   default:
@@ -24,6 +25,7 @@ tasks:
       - task: included_taskfile_without_dir:gen_dir
       - task: included_with_dir:gen_file
       - task: included_taskfile_with_dir:gen_dir
+      - task: included_os:gen
 
   gen:
     cmds:

testdata/includes/Taskfile_darwin.yml

@@ -0,0 +1,4 @@
+version: '3'
+
+tasks:
+  gen: echo 'os' > os_include.txt

testdata/includes/Taskfile_linux.yml

@@ -0,0 +1,4 @@
+version: '3'
+
+tasks:
+  gen: echo 'os' > os_include.txt

testdata/includes/Taskfile_windows.yml

@@ -0,0 +1,4 @@
+version: '3'
+
+tasks:
+  gen: echo 'os' > os_include.txt