/
script.go
95 lines (77 loc) · 2.38 KB
/
script.go
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package transform
import (
"os/exec"
"os"
"fmt"
"errors"
"strings"
"github.com/ncipollo/fnew/message"
"sort"
)
type ScriptTransform struct {
Options
output message.Printer
runner CommandRunner
}
func NewScriptTransform(options Options,
output message.Printer,
runner CommandRunner) *ScriptTransform {
return &ScriptTransform{Options: options, output: output, runner: runner}
}
func (transform *ScriptTransform) Apply(variables Variables) error {
transform.output.Println(transform.transformMessage(variables))
err := transform.validateInputPath(variables)
if err != nil {
return err
}
cmd := transform.createCommand(variables)
return transform.runner.RunCommand(*cmd)
}
func (transform *ScriptTransform) transformMessage(variables Variables) string {
inputPath := transform.inputPath(variables)
return fmt.Sprintf("Running script at path: (%s)", inputPath)
}
func (transform *ScriptTransform) validateInputPath(variables Variables) error {
inputPath := transform.inputPath(variables)
if len(inputPath) == 0 {
return errors.New("invalid input path")
}
return nil
}
func (transform *ScriptTransform) inputPath(variables Variables) string {
if strings.HasPrefix(transform.Options.InputPath, "$") {
return variables[strings.TrimPrefix(transform.Options.InputPath, "$")]
} else {
return transform.Options.InputPath
}
}
func (transform *ScriptTransform) createCommand(variables Variables) *exec.Cmd {
scriptPath := transform.InputPath
args := append([]string{scriptPath}, transform.Arguments...)
cmd := exec.Command("sh", args...)
cmd.Env = transform.environmentFromVariables(variables)
return cmd
}
func (ScriptTransform) environmentFromVariables(variables Variables) []string {
environment := os.Environ()
for key, value := range variables {
environment = append(environment, fmt.Sprintf("%s=%s", key, value))
}
sort.Strings(environment)
return environment
}
type CommandRunner interface {
RunCommand(cmd exec.Cmd) error
}
type osCommandRunner struct{}
func NewCommandRunner() CommandRunner {
return &osCommandRunner{}
}
func (osCommandRunner) RunCommand(cmd exec.Cmd) error {
stdoutStderr, err := cmd.CombinedOutput()
if err != nil {
return err
}
fmt.Printf("%s\n", stdoutStderr)
return nil
}