refactor: internal package

internal/execy/execy.go

@@ -0,0 +1,31 @@
+// Package execy runs external commands.
+package execy
+
+import (
+	"os/exec"
+)
+
+var runner = Runner(&osRunner{})
+
+// Runner executes external commands.
+type Runner interface {
+	Run(cmd *exec.Cmd) error
+}
+
+// osRunner runs OS programs.
+type osRunner struct{}
+
+func (r *osRunner) Run(cmd *exec.Cmd) error {
+	return cmd.Run()
+}
+
+func Run(cmd *exec.Cmd) error {
+	return runner.Run(cmd)
+}
+
+// CmdOut represents the result of the command run.
+type CmdOut struct {
+	Stdout string
+	Stderr string
+	Err    error
+}