61 lines
1.1 KiB
Go
61 lines
1.1 KiB
Go
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package main
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import (
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"encoding/json"
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"errors"
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"fmt"
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"io/ioutil"
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"log"
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"os"
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"os/user"
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"strings"
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)
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type Config struct {
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Tick int `json:"tick"` // ms
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Timescale float32 `json:"timescale"`
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Width int `json:"width"`
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Height int `json:"height"`
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Obstacles int `json:"obstacles"`
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}
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const (
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TICK = 60
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TIMESCALE = 1.0
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WIDTH = 800
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HEIGHT = 550
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OBSTACLES = 5
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)
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func loadConfig(filename string) (Config, error) {
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c := Config{}
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u, err := user.Current()
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if err != nil {
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return c, err
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}
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if len(filename) > 1 && filename[:2] == "~/" {
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filename = strings.Replace(filename, "~", u.HomeDir, 1)
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}
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if _, err := os.Stat(filename); os.IsNotExist(err) {
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log.Printf("%+v not found, using defaults", filename)
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return Config{
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Tick: TICK,
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Timescale: TIMESCALE,
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Width: WIDTH,
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Height: HEIGHT,
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Obstacles: OBSTACLES,
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}, nil
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} else {
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log.Printf("found config file: %s", filename)
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f, err := ioutil.ReadFile(filename)
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if err != nil {
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return c, err
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}
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err = json.Unmarshal(f, &c)
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if err != nil {
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return c, errors.New(fmt.Sprintf("config parse error: %s", err))
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}
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}
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return c, nil
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}
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