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?

internal/taskwarrior/filter.go

@@ -0,0 +1,35 @@
+package taskwarrior
+
+import "fmt"
+
+type Filter struct {
+	filter []string
+}
+
+func (f *Filter) Reset() {
+	f.filter = nil
+}
+
+func (f *Filter) IncludeProjects(projects ...string) {
+	for _, project := range projects {
+		f.filter = append(f.filter, fmt.Sprintf("project:%s", project))
+	}
+}
+
+func (f *Filter) IncludeTags(tags ...string) {
+	for _, tag := range tags {
+		f.filter = append(f.filter, fmt.Sprintf("+%s", tag))
+	}
+}
+
+func (f *Filter) ExcludeTags(tags ...string) {
+	for _, tag := range tags {
+		f.filter = append(f.filter, fmt.Sprintf("-%s", tag))
+	}
+}
+
+func (f *Filter) IncludeIds(ids ...uint) {
+	for _, id := range ids {
+		f.filter = append(f.filter, fmt.Sprintf("%d", id))
+	}
+}

internal/taskwarrior/filter_test.go

@@ -0,0 +1 @@
+package taskwarrior

internal/taskwarrior/task.go

@@ -1 +1,46 @@
 package taskwarrior
+
+import (
+	"bytes"
+	"encoding/json"
+	"os/exec"
+)
+
+/// A task with an Id of 0 is either `completed` or `deleted` which is also
+/// mentioned in the Status field
+
+type Task struct {
+	Id          uint
+	Project     string
+	Tags        []string
+	Description string
+	Annotations []Annotation
+	Status      string
+	Due         string
+	Entry       string
+	Modified    string
+	End         string
+	Uuid        string
+	Urgency     float32
+}
+
+type Annotation struct {
+	Description string
+	Entry       string
+}
+
+func GetTasks(filter Filter) ([]Task, error) {
+	filter.filter = append(filter.filter, "export")
+	cmd := exec.Command("task", filter.filter...)
+	out, err := cmd.Output()
+	if err != nil {
+		return nil, err
+	}
+	var tasks []Task
+	decoder := json.NewDecoder(bytes.NewBuffer(out))
+	decoder.DisallowUnknownFields()
+	if err = decoder.Decode(&tasks); err != nil {
+		return nil, err
+	}
+	return tasks, nil
+}