From 6636cd38c094000410ec7b40fefcda9df6dcc109 Mon Sep 17 00:00:00 2001
From: Sascha Andres <sascha.andres@outlook.com>
Date: Tue, 7 Mar 2017 09:45:14 +0100
Subject: [PATCH 1/2] Implemented os specific task file support

---
 errors.go        |  9 ++++++--
 read_taskfile.go | 58 ++++++++++++++++++++++++++++++++++++++++++++++++
 task.go          | 17 --------------
 3 files changed, 65 insertions(+), 19 deletions(-)
 create mode 100644 read_taskfile.go

diff --git a/errors.go b/errors.go
index 4b94e194..0c6a1dcf 100644
--- a/errors.go
+++ b/errors.go
@@ -4,8 +4,13 @@ import (
 	"fmt"
 )
 
-// ErrNoTaskFile is returned when the program can not find a proper TaskFile
-var ErrNoTaskFile = fmt.Errorf(`task: No task file found (is it named "%s"?)`, TaskFilePath)
+type taskFileNotFound struct {
+	taskFile string
+}
+
+func (err taskFileNotFound) Error() string {
+	return fmt.Sprintf(`task: No task file found (is it named "%s"?)`, err.taskFile)
+}
 
 type taskNotFoundError struct {
 	taskName string
diff --git a/read_taskfile.go b/read_taskfile.go
new file mode 100644
index 00000000..e76df86f
--- /dev/null
+++ b/read_taskfile.go
@@ -0,0 +1,58 @@
+package task
+
+import (
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"os"
+
+	"runtime"
+
+	"github.com/BurntSushi/toml"
+	"github.com/imdario/mergo"
+	"gopkg.in/yaml.v2"
+)
+
+func readTaskfile() (map[string]*Task, error) {
+	initialTasks, err := readTaskfileData(TaskFilePath)
+	if err != nil {
+		return nil, err
+	}
+	mergeTasks, err := readTaskfileData(fmt.Sprintf("%s_%s", TaskFilePath, runtime.GOOS))
+	if err != nil {
+		switch err.(type) {
+		default:
+			return nil, err
+		case taskFileNotFound:
+			return initialTasks, nil
+		}
+	}
+	if err := mergo.MapWithOverwrite(&initialTasks, mergeTasks); err != nil {
+		return nil, err
+	}
+	return initialTasks, nil
+}
+
+func readTaskfileData(path string) (tasks map[string]*Task, err error) {
+	if b, err := ioutil.ReadFile(path + ".yml"); err == nil {
+		return tasks, yaml.Unmarshal(b, &tasks)
+	}
+	if b, err := ioutil.ReadFile(path + ".json"); err == nil {
+		return tasks, json.Unmarshal(b, &tasks)
+	}
+	if b, err := ioutil.ReadFile(path + ".toml"); err == nil {
+		return tasks, toml.Unmarshal(b, &tasks)
+	}
+	return nil, taskFileNotFound{path}
+}
+
+func exists(path string) (bool, error) {
+	_, err := os.Stat(path)
+	if err == nil {
+		return true, nil
+	}
+	if os.IsNotExist(err) {
+		return false, nil
+	}
+	return true, err
+}
diff --git a/task.go b/task.go
index 26aa9809..ec07617f 100644
--- a/task.go
+++ b/task.go
@@ -1,16 +1,12 @@
 package task
 
 import (
-	"encoding/json"
-	"io/ioutil"
 	"log"
 	"os"
 	"os/exec"
 	"strings"
 
-	"github.com/BurntSushi/toml"
 	"github.com/spf13/pflag"
-	"gopkg.in/yaml.v2"
 )
 
 var (
@@ -168,16 +164,3 @@ func (t *Task) runCommand(i int) error {
 	}
 	return nil
 }
-
-func readTaskfile() (tasks map[string]*Task, err error) {
-	if b, err := ioutil.ReadFile(TaskFilePath + ".yml"); err == nil {
-		return tasks, yaml.Unmarshal(b, &tasks)
-	}
-	if b, err := ioutil.ReadFile(TaskFilePath + ".json"); err == nil {
-		return tasks, json.Unmarshal(b, &tasks)
-	}
-	if b, err := ioutil.ReadFile(TaskFilePath + ".toml"); err == nil {
-		return tasks, toml.Unmarshal(b, &tasks)
-	}
-	return nil, ErrNoTaskFile
-}

From 78bf1aeeac3e0035da3fbcef23c980668d193fe6 Mon Sep 17 00:00:00 2001
From: Sascha Andres <sascha.andres@outlook.com>
Date: Tue, 7 Mar 2017 09:47:41 +0100
Subject: [PATCH 2/2] Updated README

Closes #4
---
 README.md | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/README.md b/README.md
index e49afd49..300ee1f9 100644
--- a/README.md
+++ b/README.md
@@ -42,6 +42,30 @@ task assets build
 If Bash is available (Linux and Windows while on Git Bash), the commands will
 run in Bash, otherwise will fallback to `cmd` (on Windows).
 
+### OS specific task support
+
+If you add a `Taskfile_{{GOOS}}` you can override or amend your taskfile based on the op;erating system.
+
+Example:
+
+Taskfile.yml:
+
+```yml
+build:
+  cmds:
+  - echo  "default"
+```
+
+Taskfile_linux.yml:
+
+```yml
+build:
+  cmds:
+  - echo  "linux"
+```
+
+Will print out `linux` and not default
+
 ### Running task in another dir
 
 By default, tasks will be executed in the directory where the Taskfile is