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main.go
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main.go
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// Copyright (C) 2023 Shanhu Tech Inc.
//
// This program is free software: you can redistribute it and/or modify it
// under the terms of the GNU Affero General Public License as published by the
// Free Software Foundation, either version 3 of the License, or (at your
// option) any later version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License
// for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
package main
import (
"encoding/json"
"flag"
"io"
"log"
"os"
"shanhu.io/g/dags"
"shanhu.io/g/errcode"
)
func readInput(in string) ([]byte, error) {
if in == "" {
return io.ReadAll(os.Stdin)
}
return os.ReadFile(in)
}
func writeOutput(out string, bs []byte) error {
if out == "" {
_, err := os.Stdout.Write(bs)
return err
}
return os.WriteFile(out, bs, 0644)
}
func layout(in, out string) error {
bs, err := readInput(in)
if err != nil {
return errcode.Annotate(err, "read input")
}
g := new(dags.Graph)
g = g.Reverse()
if err := json.Unmarshal(bs, &g.Nodes); err != nil {
return errcode.Annotate(err, "parse graph")
}
_, v, err := dags.Layout(g)
if err != nil {
return errcode.Annotate(err, "layout graph")
}
m := dags.Output(v)
outBytes, err := json.Marshal(m)
if err != nil {
return errcode.Annotate(err, "encode output")
}
if err := writeOutput(out, outBytes); err != nil {
return errcode.Annotate(err, "write output")
}
return nil
}
func main() {
in := flag.String("in", "", "input file")
out := flag.String("out", "", "output file")
flag.Parse()
if err := layout(*in, *out); err != nil {
log.Fatal(err)
}
}