/
start.go
78 lines (65 loc) · 1.3 KB
/
start.go
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package main
import (
"context"
"fmt"
"os"
"os/exec"
"time"
"github.com/magefile/mage/target"
"golang.org/x/sync/errgroup"
)
// Starts the development server and will restart the server on any changes
func Start() error {
for {
eg, ctx := errgroup.WithContext(context.Background())
eg.Go(func() error {
return detectChangesInCurrentDirectory(ctx)
})
eg.Go(func() error {
// FIXME: Child commands still living after killed
// TODO: Open browser after starting
return run(ctx)
})
if err := eg.Wait(); err != nil {
if err.Error() == "reload" {
fmt.Println("File changes detected, reloading")
continue
}
return fmt.Errorf("exited: %w", err)
}
}
}
func run(ctx context.Context) error {
cmd := exec.CommandContext(
ctx,
"go",
"run",
"./cmd",
"-addr", ":0",
)
// Pipe all output to stdout
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
return cmd.Run()
}
func detectChangesInCurrentDirectory(ctx context.Context) error {
now := time.Now()
for {
select {
case <-ctx.Done():
return ctx.Err()
case <-time.After(2 * time.Second):
newChanges, err := target.DirNewer(
now,
"cmd",
"http",
)
if err != nil {
return fmt.Errorf("watch for changes: %w", err)
}
if newChanges {
return fmt.Errorf("reload")
}
}
}
}