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package importer
import (
"context"
"fmt"
"log/slog"
"net/url"
"os"
"reflect"
"searchix/internal/options"
"strings"
"github.com/bcicen/jstream"
"github.com/mitchellh/mapstructure"
"github.com/pkg/errors"
)
type nixValueJSON struct {
Type string `mapstructure:"_type"`
Text string
}
type linkJSON struct {
Name string
URL string `json:"url"`
}
type nixOptionJSON struct {
Declarations []linkJSON
Default *nixValueJSON
Description string
Example *nixValueJSON
Loc []string
ReadOnly bool
RelatedPackages string
Type string
}
func ValueTypeToString(valueType jstream.ValueType) string {
switch valueType {
case jstream.Unknown:
return "unknown"
case jstream.Null:
return "null"
case jstream.String:
return "string"
case jstream.Number:
return "number"
case jstream.Boolean:
return "boolean"
case jstream.Array:
return "array"
case jstream.Object:
return "object"
}
return "very strange"
}
func makeGitHubFileURL(userRepo string, ref string, subPath string) string {
url, _ := url.JoinPath("https://github.com/", userRepo, "blob", ref, subPath)
return url
}
// make configurable?
var channelRepoMap = map[string]string{
"nixpkgs": "NixOS/nixpkgs",
"nix-darwin": "LnL7/nix-darwin",
"home-manager": "nix-community/home-manager",
}
func MakeChannelLink(channel string, ref string, subPath string) (*options.Link, error) {
if channelRepoMap[channel] == "" {
return nil, fmt.Errorf("don't know what repository relates to channel <%s>", channel)
}
return &options.Link{
Name: fmt.Sprintf("<%s/%s>", channel, subPath),
URL: makeGitHubFileURL(channelRepoMap[channel], ref, subPath),
}, nil
}
func convertNixValue(nj *nixValueJSON) *options.NixValue {
if nj == nil {
return nil
}
switch nj.Type {
case "", "literalExpression":
return &options.NixValue{
Text: nj.Text,
}
case "literalMD":
return &options.NixValue{
Markdown: options.Markdown(nj.Text),
}
default:
slog.Warn("got unexpected NixValue type", "type", nj.Type, "text", nj.Text)
return nil
}
}
type OptionIngester struct {
dec *jstream.Decoder
ms *mapstructure.Decoder
optJSON nixOptionJSON
infile *os.File
source Source
}
type Ingester[T options.NixOption] interface {
Process() (<-chan *T, <-chan error)
}
func NewOptionProcessor(inpath string, source Source) (*OptionIngester, error) {
infile, err := os.Open(inpath)
if err != nil {
return nil, errors.WithMessagef(err, "failed to open input file %s", inpath)
}
i := OptionIngester{
dec: jstream.NewDecoder(infile, 1).EmitKV(),
optJSON: nixOptionJSON{},
infile: infile,
source: source,
}
ms, err := mapstructure.NewDecoder(&mapstructure.DecoderConfig{
ErrorUnused: true,
ZeroFields: true,
Result: &i.optJSON,
Squash: true,
DecodeHook: mapstructure.TextUnmarshallerHookFunc(),
})
if err != nil {
defer infile.Close()
return nil, errors.WithMessage(err, "could not create mapstructure decoder")
}
i.ms = ms
return &i, nil
}
func (i *OptionIngester) Process(ctx context.Context) (<-chan *options.NixOption, <-chan error) {
results := make(chan *options.NixOption)
errs := make(chan error)
go func() {
defer i.infile.Close()
defer close(results)
defer close(errs)
slog.Debug("starting decoder stream")
outer:
for mv := range i.dec.Stream() {
select {
case <-ctx.Done():
break outer
default:
}
if err := i.dec.Err(); err != nil {
errs <- errors.WithMessage(err, "could not decode JSON")
continue
}
if mv.ValueType != jstream.Object {
errs <- errors.Errorf("unexpected object type %s", ValueTypeToString(mv.ValueType))
continue
}
kv := mv.Value.(jstream.KV)
x := kv.Value.(map[string]interface{})
var decls []*options.Link
for _, decl := range x["declarations"].([]interface{}) {
i.optJSON = nixOptionJSON{}
switch decl := reflect.ValueOf(decl); decl.Kind() {
case reflect.String:
s := decl.String()
link, err := MakeChannelLink(i.source.Channel, i.source.Repo.Revision, s)
if err != nil {
errs <- errors.WithMessagef(err,
"could not make a channel link for channel %s, revision %s and subpath %s",
i.source.Channel, i.source.Repo.Revision, s,
)
continue
}
decls = append(decls, link)
case reflect.Map:
v := decl.Interface().(map[string]interface{})
link := options.Link{
Name: v["name"].(string),
URL: v["url"].(string),
}
decls = append(decls, &link)
default:
errs <- errors.Errorf("unexpected declaration type %s", decl.Kind().String())
continue
}
}
if len(decls) > 0 {
x["declarations"] = decls
}
err := i.ms.Decode(x) // stores in optJSON
if err != nil {
errs <- errors.WithMessagef(err, "failed to decode option %#v", x)
continue
}
var decs = make([]options.Link, len(i.optJSON.Declarations))
for i, d := range i.optJSON.Declarations {
decs[i] = options.Link(d)
}
// slog.Debug("sending option", "name", kv.Key)
results <- &options.NixOption{
Option: kv.Key,
Source: strings.ToLower(i.source.Name),
Declarations: decs,
Default: convertNixValue(i.optJSON.Default),
Description: options.Markdown(i.optJSON.Description),
Example: convertNixValue(i.optJSON.Example),
RelatedPackages: options.Markdown(i.optJSON.RelatedPackages),
Loc: i.optJSON.Loc,
Type: i.optJSON.Type,
}
}
}()
return results, errs
}
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