Amend command

Modifies the current Pomodoro

README.md

@@ -39,7 +39,7 @@ $ pomodoro start --duration 22m30s
 # Provide a description and tags
 $ pomodoro start "Blog post" -t writing,personal
 25:00 🍅
-Writing a blog post
+Blog post
 writing,personal
 
 # Block until the Pomodoro finishes
@@ -48,6 +48,21 @@ $ pomodoro start --wait
 24:99
 ```
 
+### Amend the current Pomodoro
+
+```
+$ pomodoro start "Blog postt" --tags writing,personal
+25:00 🍅
+Blog postt
+writing,personal
+
+# Pass any options accepted by start. Only passed options will be changed.
+$ pomodoro amend "Blog post"
+24:30 🍅
+Blog post
+writing,personal
+```
+
 ### Check the status of the current Pomodoro
 
 ```

cmd/amend.go

@@ -0,0 +1,64 @@
+package cmd
+
+import (
+	"fmt"
+	"strings"
+	"time"
+
+	"github.com/spf13/cobra"
+)
+
+func init() {
+	command := &cobra.Command{
+		Use:   "amend",
+		Short: "Amend the last Pomodoro",
+		RunE:  amendCmd,
+	}
+
+	command.Flags().DurationVarP(
+		&agoFlag, "ago", "a", 0,
+		"time ago this Pomodoro started")
+
+	command.Flags().IntVarP(
+		&durationFlag, "duration", "d",
+		0,
+		"duration for this Pomodoro")
+
+	command.Flags().StringArrayVarP(
+		&tagsFlag, "tags", "t", []string{},
+		"tags for this Pomodoro")
+
+	RootCmd.AddCommand(command)
+}
+
+func amendCmd(cmd *cobra.Command, args []string) error {
+	h, err := client.History()
+	if err != nil {
+		return err
+	}
+	p := h.Latest()
+	if p == nil {
+		return fmt.Errorf("No Pomodoros found")
+	}
+
+	description := strings.Join(args, " ")
+	if description != "" {
+		p.Description = description
+	}
+	if durationFlag != 0 {
+		p.Duration = time.Duration(durationFlag) * time.Minute
+	}
+	if agoFlag != 0 {
+		p.StartTime = time.Now().Add(-agoFlag)
+	}
+	if len(tagsFlag) != 0 {
+		p.Tags = tagsFlag
+	}
+
+	err = client.Start(p)
+	if err != nil {
+		return err
+	}
+
+	return statusCmd(cmd, args)
+}