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task.go
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task.go
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//
// Copyright © 2018 Aljabr, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
package os
import (
"os/exec"
go_eval "github.com/kocircuit/kocircuit/lang/go/eval"
"github.com/kocircuit/kocircuit/lang/go/kit/tree"
"github.com/kocircuit/kocircuit/lang/go/kit/util"
"github.com/kocircuit/kocircuit/lang/go/runtime"
)
func init() {
go_eval.RegisterNamedEvalGate("Task", new(GoTask))
}
// GoTask implements the running on an external command.
type GoTask struct {
Name string `ko:"name=name"`
Binary string `ko:"name=binary"`
Arg []string `ko:"name=arg"`
Env []string `ko:"name=env"`
Dir *string `ko:"name=dir"`
After []*GoTask `ko:"name=after"`
}
// Play invokes the external command.
func (t *GoTask) Play(ctx *runtime.Context) bool {
if out, err := t.RunWithOutput(); err != nil {
ctx.Printf("task %s exited unsuccessfully (%v) with output:\n%s", tree.Sprint(t), err, out)
return false
}
return true
}
// RunWithOutput invokes the external command, waits until it is terminated
// and returns its output.
func (t *GoTask) RunWithOutput() (string, error) {
cmd := &exec.Cmd{
Path: t.Binary,
Args: append([]string{t.Binary}, t.Arg...),
Dir: util.OptString(t.Dir, ""),
Env: t.Env,
}
std, err := cmd.CombinedOutput()
return string(std), err
}
func (*GoTask) Doc() string {
return "Task(name, binary, arg, env, dir, after) runs an external process"
}
func (*GoTask) Help() string { return "Task(name, binary, arg, env, dir, after)" }