/
main.go
164 lines (146 loc) · 3.83 KB
/
main.go
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package main
import (
"encoding/json"
"flag"
"fmt"
"os"
"path/filepath"
"strings"
goacodegen "goa.design/goa/v3/codegen"
"goa.design/model/codegen"
"goa.design/model/mdl"
model "goa.design/model/pkg"
)
func main() {
var (
gset = flag.NewFlagSet("global", flag.ExitOnError)
debug, help, h *bool
genset = flag.NewFlagSet("gen", flag.ExitOnError)
out = genset.String("out", "design.json", "set path to generated JSON representation")
svrset = flag.NewFlagSet("serve", flag.ExitOnError)
dir = svrset.String("dir", goacodegen.Gendir, "set output directory used by editor to save SVG files")
port = svrset.Int("port", 8080, "set local HTTP port used to serve diagram editor")
devmode = os.Getenv("DEVMODE") == "1"
showUsage = func() { printUsage(svrset, genset, gset) }
)
addGlobals := func(set *flag.FlagSet) {
debug = set.Bool("debug", false, "print debug output")
help = set.Bool("help", false, "print this information")
h = set.Bool("h", false, "print this information")
}
var (
cmd string
pkg string
idx = 1
)
for _, arg := range os.Args[1:] {
if strings.HasPrefix(arg, "-") {
break
} else if cmd == "" {
cmd = arg
} else if pkg == "" {
pkg = arg
} else {
addGlobals(gset)
showUsage()
}
idx++
}
switch cmd {
case "gen":
addGlobals(genset)
if err := genset.Parse(os.Args[idx:]); err != nil {
fail(err.Error())
}
case "serve":
addGlobals(svrset)
if err := svrset.Parse(os.Args[idx:]); err != nil {
fail(err.Error())
}
default:
addGlobals(gset)
if err := gset.Parse(os.Args[idx:]); err != nil {
fail(err.Error())
}
}
if *h || *help {
showUsage()
os.Exit(0)
}
var err error
switch cmd {
case "gen":
if pkg == "" {
fail(`missing PACKAGE argument, use "--help" for usage`)
}
var b []byte
b, err = codegen.JSON(pkg, *debug)
if err == nil {
err = os.WriteFile(*out, b, 0644)
}
case "serve":
if pkg == "" {
fail(`missing PACKAGE argument, use "--help" for usage`)
}
*dir, _ = filepath.Abs(*dir)
if err := os.MkdirAll(*dir, 0700); err != nil {
fail(err.Error())
}
err = serve(*dir, pkg, *port, devmode, *debug)
case "version":
fmt.Printf("%s %s\n", os.Args[0], model.Version())
case "", "help":
showUsage()
default:
fail(`unknown command %q, use "--help" for usage`, cmd)
}
if err != nil {
fail(err.Error())
}
}
func serve(out, pkg string, port int, devmode, debug bool) error {
// Retrieve initial design and create server.
b, err := codegen.JSON(pkg, debug)
if err != nil {
return err
}
var design mdl.Design
if err := json.Unmarshal(b, &design); err != nil {
return fmt.Errorf("failed to load design: %s", err.Error())
}
s := NewServer(&design)
// Update server whenever design changes on disk.
err = watch(pkg, func() {
b, err := codegen.JSON(pkg, debug)
if err != nil {
fmt.Println("error parsing DSL:\n" + err.Error())
return
}
design = mdl.Design{}
if err := json.Unmarshal(b, &design); err != nil {
fmt.Println("failed to load design: " + err.Error())
return
}
s.SetDesign(&design)
})
if err != nil {
return err
}
return s.Serve(out, devmode, port)
}
func printUsage(fss ...*flag.FlagSet) {
fmt.Fprintln(os.Stderr, "Usage:")
fmt.Fprintf(os.Stderr, " %s serve PACKAGE [FLAGS].\n", os.Args[0])
fmt.Fprintf(os.Stderr, " Start a HTTP server that serves a graphical editor for the design described in PACKAGE.\n")
fmt.Fprintf(os.Stderr, " %s gen PACKAGE [FLAGS].\n", os.Args[0])
fmt.Fprintf(os.Stderr, " Generate a JSON representation of the design described in PACKAGE.\n")
fmt.Fprintf(os.Stderr, "\nPACKAGE must be the import path to a Go package containing Model DSL.\n\n")
fmt.Fprintf(os.Stderr, "FLAGS:\n")
for _, fs := range fss {
fs.PrintDefaults()
}
}
func fail(format string, args ...any) {
fmt.Fprintf(os.Stderr, format+"\n", args...)
os.Exit(1)
}