add(taskwarrior): get exported taskwarrior tasks

This implementation uses a filter struct to create taskwarrior filters
(like you would do in the command line) to export the filtered tasks
into json which are parsed as go structs.

cmd/gitw/main.go

@@ -6,6 +6,7 @@ import (
 
 	"gitea.yves-biener.de/yves-biener/gitwarrior/internal/gitea"
 	"gitea.yves-biener.de/yves-biener/gitwarrior/internal/gitw"
+	"gitea.yves-biener.de/yves-biener/gitwarrior/internal/taskwarrior"
 )
 
 func main() {
@@ -54,6 +55,30 @@ func main() {
 		}
 	}
 
+	var filter taskwarrior.Filter
+	filter.IncludeProjects("notes")
+	tasks, err := taskwarrior.GetTasks(filter)
+	if err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(-1)
+	}
+	for _, task := range tasks {
+		fmt.Printf("%#v\n", task)
+	}
+	fmt.Println("---")
+
+	filter.Reset()
+	filter.IncludeIds(1, 2, 3)
+	tasks, err = taskwarrior.GetTasks(filter)
+	if err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(-1)
+	}
+	for _, task := range tasks {
+		fmt.Printf("%#v\n", task)
+	}
+	fmt.Println("---")
+
 	// necessary configurations (see config file gitw.json)
 	// - access code for gitea
 	// - configuration for taskwarrior settings?