gems/opal-task/cmd/modify.go

package cmd

import (
	"fmt"
	"os"

	"git.jnss.me/joakim/opal/internal/engine"
	"github.com/spf13/cobra"
)

var modifyCmd = &cobra.Command{
	Use:   "modify [modifier...]",
	Short: "Modify task attributes",
	Long: `Modify task attributes. Filters must come before 'modify', modifiers after.

Examples:
  opal 2 modify priority:H
  opal +urgent modify due:tomorrow
  opal project:backend modify priority:L
  opal modify priority:H               # Modify ALL pending tasks (with confirmation)`,
	Run: func(cmd *cobra.Command, args []string) {
		parsed := getParsedArgs(cmd)
		if err := modifyTasks(parsed.Filters, parsed.Modifiers); err != nil {
			fmt.Fprintf(os.Stderr, "Error: %v\n", err)
			os.Exit(1)
		}
	},
}

func modifyTasks(filterArgs, modifierArgs []string) error {
	// Validate we have modifiers
	if len(modifierArgs) == 0 {
		return fmt.Errorf("no modifiers specified (modifiers must come after 'modify')")
	}

	// Parse filter (or use default if no filters specified)
	var filter *engine.Filter
	var err error

	if len(filterArgs) == 0 {
		// No filters = modify all pending tasks (with confirmation)
		filter = engine.DefaultFilter()
	} else {
		filter, err = engine.ParseFilter(filterArgs)
		if err != nil {
			return fmt.Errorf("failed to parse filter: %w", err)
		}
	}

	// Load working set for ID resolution
	ws, err := engine.LoadWorkingSet()
	if err != nil {
		// If no working set exists yet, build one from filtered tasks
		tasks, err := engine.GetTasks(filter)
		if err != nil {
			return fmt.Errorf("failed to get tasks: %w", err)
		}
		ws, err = engine.BuildWorkingSet(tasks)
		if err != nil {
			return fmt.Errorf("failed to build working set: %w", err)
		}
	}

	// Resolve tasks
	var tasks []*engine.Task

	if len(filter.IDs) > 0 {
		// Resolve display IDs
		for _, id := range filter.IDs {
			task, err := ws.GetTaskByDisplayID(id)
			if err != nil {
				return err
			}
			tasks = append(tasks, task)
		}
	} else {
		// Use filter to get tasks
		tasks, err = engine.GetTasks(filter)
		if err != nil {
			return err
		}
	}

	if len(tasks) == 0 {
		return fmt.Errorf("no tasks matched filter")
	}

	if dryRunFlag {
		fmt.Print(engine.FormatTaskConfirmList("modify", tasks, ws))
		fmt.Println("Dry run — no changes made.")
		return nil
	}

	// Confirm if multiple tasks or no filters specified
	if len(tasks) > 1 || len(filterArgs) == 0 {
		fmt.Print(engine.FormatTaskConfirmList("modify", tasks, ws))
		fmt.Printf("Proceed? (y/N): ")
		var confirm string
		fmt.Scanln(&confirm)
		if confirm != "y" && confirm != "Y" {
			fmt.Println("Cancelled.")
			return nil
		}
	}

	// Parse and apply modifiers
	mod, err := engine.ParseModifier(modifierArgs)
	if err != nil {
		return fmt.Errorf("failed to parse modifiers: %w", err)
	}

	modified := 0
	for _, task := range tasks {
		if err := mod.Apply(task); err != nil {
			fmt.Fprintf(os.Stderr, "Warning: failed to modify task %s: %v\n", task.UUID, err)
		} else {
			engine.RecordUndo("modify", task.UUID)
			modified++
		}
	}

	fmt.Printf("Modified %d task(s).\n", modified)
	return nil
}