Add hability to globally set environment variables

Closes #138

internal/taskfile/taskfile.go

@@ -7,6 +7,7 @@ type Taskfile struct {
 	Output     string
 	Includes   map[string]string
 	Vars       Vars
+	Env        Vars
 	Tasks      Tasks
 }
 
@@ -23,6 +24,7 @@ func (tf *Taskfile) UnmarshalYAML(unmarshal func(interface{}) error) error {
 		Output     string
 		Includes   map[string]string
 		Vars       Vars
+		Env        Vars
 		Tasks      Tasks
 	}
 	if err := unmarshal(&taskfile); err != nil {
@@ -33,6 +35,7 @@ func (tf *Taskfile) UnmarshalYAML(unmarshal func(interface{}) error) error {
 	tf.Output = taskfile.Output
 	tf.Includes = taskfile.Includes
 	tf.Vars = taskfile.Vars
+	tf.Env = taskfile.Env
 	tf.Tasks = taskfile.Tasks
 	if tf.Expansions <= 0 {
 		tf.Expansions = 2

task.go

@@ -268,9 +268,9 @@ func getEnviron(t *taskfile.Task) []string {
 		return nil
 	}
 
-	envs := os.Environ()
+	environ := os.Environ()
 	for k, v := range t.Env.ToStringMap() {
-		envs = append(envs, fmt.Sprintf("%s=%s", k, v))
+		environ = append(environ, fmt.Sprintf("%s=%s", k, v))
 	}
-	return envs
+	return environ
 }

task_test.go

@@ -61,7 +61,8 @@ func TestEnv(t *testing.T) {
 		Target:    "default",
 		TrimSpace: false,
 		Files: map[string]string{
-			"env.txt": "GOOS='linux' GOARCH='amd64' CGO_ENABLED='0'\n",
+			"local.txt":  "GOOS='linux' GOARCH='amd64' CGO_ENABLED='0'\n",
+			"global.txt": "FOO='foo' BAR='overriden' BAZ='baz'\n",
 		},
 	}
 	tt.Run(t)

testdata/env/.gitignore

@@ -1 +1 @@
-env.txt
+*.txt

testdata/env/Taskfile.yml

@@ -1,4 +1,21 @@
-default:
+version: '2'
+
+vars:
+  BAZ:
+    sh: echo baz
+
+env:
+  FOO: foo
+  BAR: bar
+  BAZ: "{{.BAZ}}"
+
+tasks:
+  default:
+    cmds:
+      - task: local
+      - task: global
+
+  local:
     vars:
       AMD64: amd64
     env:
@@ -7,4 +24,10 @@ default:
       CGO_ENABLED:
         sh: echo '0'
     cmds:
-    - echo "GOOS='$GOOS' GOARCH='$GOARCH' CGO_ENABLED='$CGO_ENABLED'" > env.txt
+      - echo "GOOS='$GOOS' GOARCH='$GOARCH' CGO_ENABLED='$CGO_ENABLED'" > local.txt
+
+  global:
+    env:
+      BAR: overriden
+    cmds:
+      - echo "FOO='$FOO' BAR='$BAR' BAZ='$BAZ'" > global.txt

variables.go

@@ -30,7 +30,7 @@ func (e *Executor) CompiledTask(call taskfile.Call) (*taskfile.Task, error) {
 		Status:      r.ReplaceSlice(origTask.Status),
 		Dir:         r.Replace(origTask.Dir),
 		Vars:        nil,
-		Env:         r.ReplaceVars(origTask.Env),
+		Env:         nil,
 		Silent:      origTask.Silent,
 		Method:      r.Replace(origTask.Method),
 		Prefix:      r.Replace(origTask.Prefix),
@@ -46,6 +46,14 @@ func (e *Executor) CompiledTask(call taskfile.Call) (*taskfile.Task, error) {
 	if new.Prefix == "" {
 		new.Prefix = new.Task
 	}
+
+	new.Env = make(taskfile.Vars, len(e.Taskfile.Env)+len(origTask.Env))
+	for k, v := range r.ReplaceVars(e.Taskfile.Env) {
+		new.Env[k] = v
+	}
+	for k, v := range r.ReplaceVars(origTask.Env) {
+		new.Env[k] = v
+	}
 	for k, v := range new.Env {
 		static, err := e.Compiler.HandleDynamicVar(v)
 		if err != nil {