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config.go
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config.go
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package config
import (
"bytes"
"io/ioutil"
"os/user"
"path"
"text/template"
"gopkg.in/yaml.v2"
"github.com/tj/robo/task"
)
// Config represents the main YAML configuration
// loaded for Robo tasks.
type Config struct {
File string
Tasks map[string]*task.Task `yaml:",inline"`
Variables map[string]interface{}
Templates struct {
List string
Help string
Variables string
}
}
// Eval evaluates the config by interpolating
// all templates using the variables.
func (c *Config) Eval() error {
for _, task := range c.Tasks {
err := interpolate(
c.Variables,
&task.Command,
&task.Summary,
&task.Script,
&task.Exec,
)
if err != nil {
return err
}
for i, item := range task.Env {
if err := interpolate(c.Variables, &item); err != nil {
return err
}
task.Env[i] = item
}
}
return nil
}
// New configuration loaded from `file`.
func New(file string) (*Config, error) {
b, err := ioutil.ReadFile(file)
if err != nil {
return nil, err
}
c, err := NewString(string(b))
if err != nil {
return nil, err
}
c.File = file
// Initialize variables if needed.
if c.Variables == nil {
c.Variables = make(map[string]interface{})
}
// Expose robo's internal variables
// but respect users who override them.
if _, ok := c.Variables["robo"]; !ok {
c.Variables["robo"] = map[string]string{
"path": path.Dir(c.File),
"file": c.File,
}
}
// Add the current user.
if _, ok := c.Variables["user"]; !ok {
if user, err := user.Current(); err == nil {
c.Variables["user"] = map[string]string{
"name": user.Name,
"username": user.Username,
"home": user.HomeDir,
}
}
}
// Interpolate variables.
if err := c.Eval(); err != nil {
return nil, err
}
return c, nil
}
// NewString configuration from string.
func NewString(s string) (*Config, error) {
c := new(Config)
// unmarshal
err := yaml.Unmarshal([]byte(s), &c)
if err != nil {
return nil, err
}
// assign .Name
for name, task := range c.Tasks {
task.Name = name
}
return c, nil
}
// Apply interpolation against the given strings.
func interpolate(v interface{}, s ...*string) error {
for _, p := range s {
ret, err := eval(*p, v)
if err != nil {
return err
}
*p = ret
}
return nil
}
// Evaluate template against `v`.
func eval(s string, v interface{}) (string, error) {
t, err := template.New("task").Parse(s)
if err != nil {
return "", err
}
var b bytes.Buffer
err = t.Execute(&b, v)
if err != nil {
return "", err
}
return string(b.Bytes()), nil
}