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stdin.go
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stdin.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.Stdin", NewStdin)
}
type Stdin struct {}
func NewStdin(val cue.Value) (context.Runner, error) {
return &Stdin{}, nil
}
func (T *Stdin) Run(ctx *context.Context) (interface{}, error) {
v := ctx.Value
var m string
ferr := func () error {
ctx.CUELock.Lock()
defer func() {
ctx.CUELock.Unlock()
}()
var err error
msg := v.LookupPath(cue.ParsePath("msg"))
if msg.Err() != nil {
return msg.Err()
} else if msg.Exists() {
m, err = msg.String()
if err != nil {
return err
}
// print message to user
}
return nil
}()
if ferr != nil {
return nil, ferr
}
if len(m) > 0 {
fmt.Fprint(ctx.Stdout, m)
}
reader := bufio.NewReader(ctx.Stdin)
text, _ := reader.ReadString('\n')
ctx.CUELock.Lock()
defer ctx.CUELock.Unlock()
res := v.FillPath(cue.ParsePath("contents"), text)
return res, nil
}