nix: added package actions

pkg/actions/tools/nix/package.go

@@ -0,0 +1,59 @@
+package nix
+
+import (
+	"fmt"
+	"os"
+	"strings"
+
+	"github.com/rsteube/carapace"
+)
+
+// ActionChannelPackages completes local channels and their packages
+//
+//	nixos.g++
+//	nixos.gacutil
+func ActionChannelPackages() carapace.Action {
+	return carapace.ActionMultiParts(".", func(c carapace.Context) carapace.Action {
+		switch len(c.Parts) {
+		case 0:
+			return ActionLocalChannels().Invoke(c).Suffix(".").ToA()
+
+		case 1:
+			return ActionPackages(c.Parts[0])
+
+		default:
+			return carapace.ActionValues()
+		}
+	})
+}
+
+// ActionPackages completes packages for given channel
+//
+//	g++
+//	gacutil
+func ActionPackages(channel string) carapace.Action {
+	return carapace.ActionCallback(func(c carapace.Context) carapace.Action {
+		if channel == "" {
+			channel = "nixos"
+		}
+
+		path, err := c.Abs(fmt.Sprintf("~/.nix-defexpr/channels/%v/programs.sqlite", channel))
+		if err != nil {
+			return carapace.ActionMessage(err.Error())
+		}
+
+		if _, err := os.Stat(path); err != nil {
+			return carapace.ActionMessage(err.Error())
+		}
+
+		if c.CallbackValue == "" {
+			return carapace.ActionMessage("search needs at least 1 character")
+		}
+
+		query := fmt.Sprintf(`SELECT name FROM Programs WHERE name LIKE "%v%%"`, c.CallbackValue)
+		return carapace.ActionExecCommand("sqlite3", path, query)(func(output []byte) carapace.Action {
+			lines := strings.Split(string(output), "\n")
+			return carapace.ActionValues(lines[:len(lines)-1]...)
+		})
+	})
+}