Implemented projects/tasks structure listing; this implements #1 partially

README.md

@@ -126,10 +126,43 @@ zeit finish --begin 16:00
 
 ### List tracked activity
 
+```sh
+zeit list --help
+```
+
+#### Examples:
+
+List all tracked activities:
+
 ```sh
 zeit list
 ```
 
+List all tracked activities since a specific date/time:
+
+```sh
+zeit list --since "2020-10-14T00:00:01+01:00"
+```
+
+List all tracked activities and add the total hours:
+
+```sh
+zeit list --total
+```
+
+List only projects and tasks (relational):
+
+```sh
+zeit list --only-projects-and-tasks
+```
+
+List only projects and tasks (relational) that were tracked since a specific 
+date/time:
+
+```sh
+zeit list --only-projects-and-tasks --since "2020-10-14T00:00:01+01:00"
+```
+
 
 ### Display/update activity
 

z/entry.go

@@ -6,6 +6,7 @@ import (
   "time"
   "fmt"
   "github.com/gookit/color"
+  "github.com/shopspring/decimal"
 )
 
 type Entry struct {
@@ -128,6 +129,11 @@ func (entry *Entry) GetOutputForTrack(isRunning bool, wasRunning bool) (string)
   return fmt.Sprintf("%s %s task%s\n", CharTrack, outputPrefix, outputSuffix)
 }
 
+func (entry *Entry) GetDuration() (decimal.Decimal) {
+  duration := entry.Finish.Sub(entry.Begin)
+  return decimal.NewFromFloat(duration.Hours())
+}
+
 func (entry *Entry) GetOutputForFinish() (string) {
   var outputSuffix string = ""
 

z/listCmd.go

@@ -9,6 +9,7 @@ import (
 )
 
 var listTotalTime bool
+var listOnlyProjectsAndTasks bool
 
 var listCmd = &cobra.Command{
   Use:   "list",
@@ -49,11 +50,35 @@ var listCmd = &cobra.Command{
       os.Exit(1)
     }
 
+    if listOnlyProjectsAndTasks == true {
+      var projectsAndTasks = make(map[string]map[string]bool)
+
+      for _, filteredEntry := range filteredEntries {
+        taskMap, ok := projectsAndTasks[filteredEntry.Project]
+
+        if !ok {
+          taskMap = make(map[string]bool)
+          projectsAndTasks[filteredEntry.Project] = taskMap
+        }
+
+        taskMap[filteredEntry.Task] = true
+        projectsAndTasks[filteredEntry.Project] = taskMap
+      }
+
+      for project, _ := range projectsAndTasks {
+        fmt.Printf("%s %s\n", CharMore, project)
+
+        for task, _ := range projectsAndTasks[project] {
+          fmt.Printf("%*s└── %s\n", 1, " ", task)
+        }
+      }
+
+      return
+    }
+
     totalHours := decimal.NewFromInt(0);
     for _, entry := range filteredEntries {
-      duration := entry.Finish.Sub(entry.Begin)
-      durationDec := decimal.NewFromFloat(duration.Hours())
-      totalHours = totalHours.Add(durationDec)
+      totalHours = totalHours.Add(entry.GetDuration())
       fmt.Printf("%s\n", entry.GetOutput(false))
     }
 
@@ -71,6 +96,7 @@ func init() {
   listCmd.Flags().StringVarP(&project, "project", "p", "", "Project to be listed")
   listCmd.Flags().StringVarP(&task, "task", "t", "", "Task to be listed")
   listCmd.Flags().BoolVar(&listTotalTime, "total", false, "Show total time of hours for listed activities")
+  listCmd.Flags().BoolVar(&listOnlyProjectsAndTasks, "only-projects-and-tasks", false, "Only list projects and their tasks, no entries")
 
   var err error
   database, err = InitDatabase()

z/rootCmd.go

@@ -26,6 +26,7 @@ const(
   CharErase = " ◀"
   CharError = " ▲"
   CharInfo = " ●"
+  CharMore = " ◆"
 )
 
 var rootCmd = &cobra.Command{