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package main
import (
"fmt"
"io"
"os"
"strings"
"github.com/alexflint/go-arg"
"go.wit.com/lib/gui/shell"
"go.wit.com/log"
)
// sent via -ldflags
var VERSION string
var BUILDTIME string
func main() {
pp := arg.MustParse(&argv)
// you need a proto file
if argv.Proto == "" {
log.Info("you must provide --proto <filename>")
os.Exit(-1)
}
if !shell.Exists(argv.Proto) {
log.Info("protobuf", argv.Proto, "is missing")
if !argv.DryRun {
os.Exit(-1)
}
}
if !strings.HasSuffix(argv.Proto, ".proto") {
log.Info("protobuf", argv.Proto, "must end in .proto")
os.Exit(-1)
}
// you need --upbase and --lobase
if argv.UpBase == "" {
pp.WriteHelp(os.Stdout)
os.Exit(-1)
}
cmd := []string{"go", "list", "-f", "'{{.Name}}'"}
result := shell.Run(cmd)
packageName := strings.Join(result.Stdout, "\n")
packageName = strings.TrimSpace(packageName)
packageName = strings.Trim(packageName, "'")
log.Info("packageName == ", packageName)
protobase := strings.TrimSuffix(argv.Proto, ".proto")
sortmap := make(map[string]string)
sortmap["package"] = packageName
sortmap["protobase"] = protobase
sortmap["base"] = argv.LoBase
sortmap["lock"] = sortmap["base"] + "slock"
sortmap["Base"] = argv.UpBase
sortmap["Bases"] = sortmap["Base"] + "s"
sortparts := strings.Split(argv.Sort[0], ",")
sortmap["sortBy"] = sortparts[0]
sortmap["sortKey"] = sortparts[1]
if argv.DryRun {
for k, v := range sortmap {
log.Info(k, "=", v)
}
os.Exit(0)
}
f, _ := os.OpenFile(protobase+".sort.pb.go", os.O_WRONLY|os.O_CREATE, 0600)
header(f, sortmap)
syncLock(f, sortmap)
iterTop(f, sortmap)
iterNext(f, sortmap)
iterSort(f, sortmap)
iterAppend(f, sortmap)
iterEnd(f, sortmap)
if argv.NoMarshal {
log.Info("not making marshal.pb.go file (--no-marshal == true)")
} else {
// make the foo.marshal.pb.go file
marshal(sortmap)
}
}
func headerComment(w io.Writer) {
fmt.Fprintln(w, "")
fmt.Fprintln(w, "// this file was autogenerated with autogenpb")
fmt.Fprintln(w, "//")
fmt.Fprintln(w, "// you might be able to use it on simple, strictly defined protobuf files")
fmt.Fprintln(w, "//")
fmt.Fprintln(w, "// go install go.wit.com/apps/autogenpb@latest")
fmt.Fprintln(w, "")
}
func header(w io.Writer, names map[string]string) {
fmt.Fprintln(w, "package "+names["package"])
headerComment(w)
fmt.Fprintln(w, "import (")
fmt.Fprintln(w, " \"fmt\"")
fmt.Fprintln(w, " \"os\"")
fmt.Fprintln(w, " \"sort\"")
fmt.Fprintln(w, " \"sync\"")
fmt.Fprintln(w, ")")
fmt.Fprintln(w, "")
}
func syncLock(w io.Writer, names map[string]string) {
fmt.Fprintln(w, "// bad global lock until I figure out some other plan")
fmt.Fprintln(w, "var "+names["lock"]+" sync.RWMutex")
fmt.Fprintln(w, "")
}
func iterTop(w io.Writer, names map[string]string) {
fmt.Fprintln(w, "type "+names["Base"]+"Iterator struct {")
fmt.Fprintln(w, " sync.RWMutex")
fmt.Fprintln(w, "")
fmt.Fprintln(w, " packs []*"+names["Base"])
fmt.Fprintln(w, " index int")
fmt.Fprintln(w, "}")
fmt.Fprintln(w, "")
fmt.Fprintln(w, "// New"+names["Base"]+"Iterator initializes a new iterator.")
fmt.Fprintln(w, "func New"+names["Base"]+"Iterator(packs []*"+names["Base"]+") *"+names["Base"]+"Iterator {")
fmt.Fprintln(w, " return &"+names["Base"]+"Iterator{packs: packs}")
fmt.Fprintln(w, "}")
fmt.Fprintln(w, "")
fmt.Fprintln(w, "// Scan moves to the next element and returns false if there are no more packs.")
fmt.Fprintln(w, "// Use Scan() in a loop, similar to a while loop")
fmt.Fprintln(w, "//")
fmt.Fprintln(w, "// for iterator.Scan() ")
fmt.Fprintln(w, "// d := iterator.Next(")
fmt.Fprintln(w, "// fmt.Println(\"found UUID:\", d.Uuid")
fmt.Fprintln(w, "// }")
fmt.Fprintln(w, "func (it *"+names["Base"]+"Iterator) Scan() bool {")
fmt.Fprintln(w, " if it.index >= len(it.packs) {")
fmt.Fprintln(w, " return false")
fmt.Fprintln(w, " }")
fmt.Fprintln(w, " it.index++")
fmt.Fprintln(w, " return true")
fmt.Fprintln(w, "}")
fmt.Fprintln(w, "")
}
func iterNext(w io.Writer, names map[string]string) {
fmt.Fprintln(w, "// Next() returns the next thing in the array")
fmt.Fprintln(w, "func (it *"+names["Base"]+"Iterator) Next() *"+names["Base"]+" {")
fmt.Fprintln(w, " if it.packs[it.index-1] == nil {")
fmt.Fprintln(w, " for i, d := range it.packs {")
fmt.Fprintln(w, " fmt.Println(\"i =\", i, d)")
fmt.Fprintln(w, " }")
fmt.Fprintln(w, " fmt.Println(\"protobuf autogenpb sort error len =\", len(it.packs))")
fmt.Fprintln(w, " fmt.Println(\"protobuf autogenpb sort error next == nil\", it.index, it.index-1)")
fmt.Fprintln(w, " os.Exit(-1)")
fmt.Fprintln(w, " }")
fmt.Fprintln(w, " return it.packs[it.index-1]")
fmt.Fprintln(w, "}")
fmt.Fprintln(w, "")
}
func iterSort(w io.Writer, names map[string]string) {
fmt.Fprintln(w, "func (all *"+names["Bases"]+") All() *"+names["Base"]+"Iterator {")
fmt.Fprintln(w, " "+names["base"]+"Pointers := all.selectAll"+names["Base"]+"()")
fmt.Fprintln(w, "")
fmt.Fprintln(w, " iterator := New"+names["Base"]+"Iterator("+names["base"]+"Pointers)")
fmt.Fprintln(w, " return iterator")
fmt.Fprintln(w, "}")
fmt.Fprintln(w, "")
fmt.Fprintln(w, "func (all *"+names["Bases"]+") Sort"+names["sortBy"]+"() *"+names["Base"]+"Iterator {")
fmt.Fprintln(w, " packs := all.selectAll"+names["Base"]+"()")
fmt.Fprintln(w, "")
fmt.Fprintln(w, " sort.Sort("+names["Base"]+""+names["sortBy"]+"(packs))")
fmt.Fprintln(w, "")
fmt.Fprintln(w, " iterator := New"+names["Base"]+"Iterator(packs)")
fmt.Fprintln(w, " return iterator")
fmt.Fprintln(w, "}")
fmt.Fprintln(w, "")
fmt.Fprintln(w, "func (all *"+names["Bases"]+") Len() int {")
fmt.Fprintln(w, " "+names["lock"]+".RLock()")
fmt.Fprintln(w, " defer "+names["lock"]+".RUnlock()")
fmt.Fprintln(w, "")
fmt.Fprintln(w, " return len(all."+names["Bases"]+")")
fmt.Fprintln(w, "}")
fmt.Fprintln(w, "")
}
func iterEnd(w io.Writer, names map[string]string) {
fmt.Fprintln(w, "type "+names["Base"]+""+names["sortBy"]+" []*"+names["Base"]+"")
fmt.Fprintln(w, "")
fmt.Fprintln(w, "func (a "+names["Base"]+""+names["sortBy"]+") Len() int { return len(a) }")
fmt.Fprintln(w, "func (a "+names["Base"]+""+names["sortBy"]+") Less(i, j int) bool { return a[i]."+names["sortKey"]+" < a[j]."+names["sortKey"]+" }")
fmt.Fprintln(w, "func (a "+names["Base"]+""+names["sortBy"]+") Swap(i, j int) { a[i], a[j] = a[j], a[i] }")
fmt.Fprintln(w, "")
fmt.Fprintln(w, "// safely returns a slice of pointers to the "+names["Base"]+" protobufs")
fmt.Fprintln(w, "func (all *"+names["Bases"]+") selectAll"+names["Base"]+"() []*"+names["Base"]+" {")
fmt.Fprintln(w, " "+names["lock"]+".RLock()")
fmt.Fprintln(w, " defer "+names["lock"]+".RUnlock()")
fmt.Fprintln(w, "")
fmt.Fprintln(w, " // Create a new slice to hold pointers to each "+names["Base"]+"")
fmt.Fprintln(w, " var aStuff []*"+names["Base"]+"")
fmt.Fprintln(w, " aStuff = make([]*"+names["Base"]+", len(all."+names["Bases"]+"))")
fmt.Fprintln(w, " for i, p := range all."+names["Bases"]+" {")
fmt.Fprintln(w, " aStuff[i] = p // Copy pointers for safe iteration")
fmt.Fprintln(w, " }")
fmt.Fprintln(w, "")
fmt.Fprintln(w, " return aStuff")
fmt.Fprintln(w, "}")
fmt.Fprintln(w, "")
}
func iterAppend(w io.Writer, names map[string]string) {
fmt.Fprintln(w, "// enforces no duplicate Refname names")
fmt.Fprintln(w, "func (all *"+names["Bases"]+") Append(newP *"+names["Base"]+") bool {")
fmt.Fprintln(w, " "+names["lock"]+".Lock()")
fmt.Fprintln(w, " defer "+names["lock"]+".Unlock()")
fmt.Fprintln(w, "")
fmt.Fprintln(w, " for _, p := range all."+names["Bases"]+" {")
fmt.Fprintln(w, " if p.Refname == newP.Refname {")
fmt.Fprintln(w, " return false")
fmt.Fprintln(w, " }")
fmt.Fprintln(w, " }")
fmt.Fprintln(w, "")
fmt.Fprintln(w, " all."+names["Bases"]+" = append(all."+names["Bases"]+", newP)")
fmt.Fprintln(w, " return true")
fmt.Fprintln(w, "}")
fmt.Fprintln(w, "")
}
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