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stdout.go
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/
stdout.go
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package os
import (
"bufio"
"fmt"
"cuelang.org/go/cue"
"github.com/hofstadter-io/cuetils/flow/context"
)
func init() {
context.Register("os.Stdout", NewStdout)
}
type Stdout struct {}
func NewStdout(val cue.Value) (context.Runner, error) {
return &Stdout{}, nil
}
func (T *Stdout) Run(ctx *context.Context) (interface{}, error) {
bufStdout := bufio.NewWriter(ctx.Stdout)
defer bufStdout.Flush()
v := ctx.Value
var m string
var err error
ferr := func () error {
ctx.CUELock.Lock()
defer func() {
ctx.CUELock.Unlock()
}()
msg := v.LookupPath(cue.ParsePath("text"))
if msg.Err() != nil {
return msg.Err()
} else if msg.Exists() {
m, err = msg.String()
if err != nil {
return err
}
} else {
err := fmt.Errorf("unknown msg:", msg)
return err
}
return nil
}()
if ferr != nil {
return nil, ferr
}
fmt.Fprint(bufStdout, m)
return nil, nil
}