1 files changed, 82 insertions, 0 deletions
diff --git a/internal/importer/nixpkgs-channel.go b/internal/importer/nixpkgs-channel.go
new file mode 100644
index 0000000..0e5be62
--- /dev/null
+++ b/internal/importer/nixpkgs-channel.go
@@ -0,0 +1,82 @@
+package importer
+
+import (
+	"bytes"
+	"context"
+	"log/slog"
+	"net/url"
+	"os"
+	"path"
+	"searchix/internal/file"
+	"searchix/internal/search"
+
+	"github.com/pkg/errors"
+)
+
+type NixpkgsChannelImporter struct {
+	DataPath  string
+	Source    Source
+	Logger    *slog.Logger
+	indexPath string
+}
+
+func makeChannelURL(channel string, subPath string) (string, error) {
+	url, err := url.JoinPath("https://channels.nixos.org/", channel, subPath)
+
+	return url, errors.WithMessagef(err, "error creating URL")
+}
+
+var filesToFetch = map[string]string{
+	"revision": "git-revision",
+	"options":  "options.json.br",
+}
+
+func (i *NixpkgsChannelImporter) FetchIfNeeded(parent context.Context) (bool, error) {
+	ctx, cancel := context.WithTimeout(parent, i.Source.FetchTimeout)
+	defer cancel()
+
+	root := i.DataPath
+
+	err := file.Mkdirp(root)
+	if err != nil {
+		return false, errors.WithMessagef(err, "error creating directory for data: %s", root)
+	}
+
+	for _, filename := range filesToFetch {
+		url, err := makeChannelURL(i.Source.Channel, filename)
+		if err != nil {
+			return false, err
+		}
+
+		path := path.Join(root, filename)
+
+		updated, err := fetchFileIfNeeded(ctx, path, url)
+		if err != nil {
+			return false, err
+		}
+		// don't bother to issue requests for the later files
+		if !updated {
+			return false, err
+		}
+	}
+
+	return true, nil
+}
+
+func (i *NixpkgsChannelImporter) Import(parent context.Context, indexer *search.WriteIndex) (bool, error) {
+	filename := path.Join(i.DataPath, filesToFetch["options"])
+	revFilename := path.Join(i.DataPath, filesToFetch["revision"])
+	bits, err := os.ReadFile(revFilename)
+	if err != nil {
+		return false, errors.WithMessagef(err, "unable to read revision file at %s", revFilename)
+	}
+	i.Source.Repo.Revision = string(bytes.TrimSpace(bits))
+	i.Logger.Debug("preparing import run", "revision", i.Source.Repo.Revision, "filename", filename)
+
+	return processOptions(parent, indexer, &importConfig{
+		IndexPath: i.indexPath,
+		Source:    i.Source,
+		Filename:  filename,
+		Logger:    i.Logger,
+	})
+}