add(taskwarrior): integrate uda for git integration

This implementation adds the necessary fields for the tasks of
taskwarrior to be synchronized with git. It provides the necessary
conversion of the taskwarrior times and the standard time.Time go
format. WIP for #3.

internal/gitw/project.go

@@ -0,0 +1,106 @@
+package gitw
+
+import (
+	"errors"
+
+	"gitea.yves-biener.de/yves-biener/gitwarrior/internal/gitea"
+	"gitea.yves-biener.de/yves-biener/gitwarrior/internal/taskwarrior"
+)
+
+type Project struct {
+	server     gitea.Gitea
+	repository gitea.Repository
+	issues     []Issue
+	milestones []gitea.Milestone
+}
+
+func NewProject(server gitea.Gitea, repository gitea.Repository) Project {
+	return Project{
+		server:     server,
+		repository: repository,
+	}
+}
+
+func (project *Project) Pull() error {
+	if err := project.Fetch(); err != nil {
+		return err
+	}
+	if err := project.merge(); err != nil {
+		return err
+	}
+	return nil
+}
+
+func (project *Project) Fetch() error {
+	comments, err := project.server.GetComments(project.repository)
+	if err != nil {
+		return err
+	}
+	issues, err := project.server.GetIssues(project.repository)
+	if err != nil {
+		return err
+	}
+	project.milestones, err = project.server.GetMilestones(project.repository)
+	if err != nil {
+		return err
+	}
+	for _, issue := range issues {
+		var issue_comments []gitea.Comment
+		for _, comment := range comments {
+			if comment.Issue_url == issue.Html_url {
+				issue_comments = append(issue_comments, comment)
+			}
+		}
+		project.issues = append(project.issues, Issue{
+			issue:    issue,
+			comments: issue_comments,
+		})
+	}
+	return nil
+}
+
+func (project *Project) merge() error {
+	// TODO: run merge to update the local taskwarrior tasks into the state of the
+	// issues and milestones
+	return nil
+}
+
+type Issue struct {
+	issue    gitea.Issue
+	comments []gitea.Comment
+}
+
+func (i *Issue) into() (taskwarrior.Task, error) {
+	// TODO: identify if issue is already an existing task
+	var filter taskwarrior.Filter
+	filter.IncludeGitId(i.issue.Id)
+	filter.IncludeGitType(taskwarrior.ISSUE)
+	tasks, err := taskwarrior.GetTasks(filter)
+	if err != nil {
+		// this means that a task for this issue does not exist yet
+		return taskwarrior.NewTask(
+			i.issue.Title,
+			i.issue.Repository.Name,
+			i.issue.Id,
+			taskwarrior.ISSUE,
+			i.issue.Labels...,
+		), nil
+	} else {
+		// this means that a task exists and it needs to be merged
+		if len(tasks) != 1 {
+			return taskwarrior.Task{}, errors.New("Did not find exactly one task for a given issue.Id")
+		}
+		return i.merge(tasks[0]), nil
+	}
+}
+
+func (i *Issue) merge(task taskwarrior.Task) taskwarrior.Task {
+	// TODO: issue values into task:
+	// - is the issue more recent than the task?
+	// - apply changes into task
+	// - in case of merge conflicts ask user for corresponding action:
+	//     1. use theirs
+	//     2. use mine
+	//     3. use provided value
+	return task
+}