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|
package main
import (
"encoding/json"
"flag"
"io"
"log"
"os"
"github.com/antonmedv/expr"
)
var (
minify = flag.Bool("minify", false, "minify JSON?")
noColor = flag.Bool("no-color", false, "disable color output?")
)
func main() {
flag.Parse()
if _, ok := os.LookupEnv("NO_COLOR"); ok {
*noColor = true
}
if flag.NArg() != 1 {
log.Fatal("usage: eq <expression> < data.json")
}
program, err := expr.Compile(flag.Arg(0))
if err != nil {
log.Fatalf("can't compile program: %v", err)
}
dec := json.NewDecoder(os.Stdin)
enc := json.NewEncoder(os.Stdout)
if !*minify {
enc.SetIndent("", " ")
}
for {
obj := map[string]any{}
if err := dec.Decode(&obj); err != nil {
if err == io.EOF {
break
}
log.Fatalf("can't decode JSON: %v", err)
}
output, err := expr.Run(program, obj)
if err != nil {
log.Fatalf("can't run program: %v", err)
}
if err := enc.Encode(output); err != nil {
log.Fatalf("can't write JSON: %v", err)
}
}
}
|
