From ef46540bb01703ddf05f4397c89771bb4080bc0d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Paul=20B=C3=BCtow?=
 <1224732+snonux@users.noreply.github.com>
Date: Fri, 20 Jun 2025 21:13:33 +0300
Subject: ui: add undo for done tasks

---
 internal/ui/table.go      | 11 ++++++++++
 internal/ui/table_test.go | 55 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 66 insertions(+)

diff --git a/internal/ui/table.go b/internal/ui/table.go
index bd1d4ca..3f0a16f 100644
--- a/internal/ui/table.go
+++ b/internal/ui/table.go
@@ -38,6 +38,8 @@ type Model struct {
 	filter string
 	tasks  []task.Task
 
+	undoStack []int
+
 	total      int
 	inProgress int
 	due        int
@@ -227,9 +229,17 @@ func (m Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 				idStr := ansi.Strip(row[0])
 				if id, err := strconv.Atoi(idStr); err == nil {
 					task.Done(id)
+					m.undoStack = append(m.undoStack, id)
 					m.reload()
 				}
 			}
+		case "U":
+			if n := len(m.undoStack); n > 0 {
+				id := m.undoStack[n-1]
+				m.undoStack = m.undoStack[:n-1]
+				task.SetStatus(id, "pending")
+				m.reload()
+			}
 		case "d":
 			if row := m.tbl.SelectedRow(); row != nil {
 				idStr := ansi.Strip(row[0])
@@ -295,6 +305,7 @@ func (m Model) View() string {
 			"E: edit task",
 			"s: toggle start/stop",
 			"D: mark task done",
+			"U: undo done",
 			"d: set due date",
 			"r: random due date",
 			"a: annotate task",
diff --git a/internal/ui/table_test.go b/internal/ui/table_test.go
index f02d587..0891cf7 100644
--- a/internal/ui/table_test.go
+++ b/internal/ui/table_test.go
@@ -1,6 +1,7 @@
 package ui
 
 import (
+	"fmt"
 	"os"
 	"path/filepath"
 	"strings"
@@ -174,6 +175,60 @@ func TestDoneHotkey(t *testing.T) {
 	}
 }
 
+func TestUndoHotkey(t *testing.T) {
+	tmp := t.TempDir()
+	taskPath := filepath.Join(tmp, "task")
+	logFile := filepath.Join(tmp, "log.txt")
+
+	script := fmt.Sprintf("#!/bin/sh\n"+
+		"if echo \"$@\" | grep -q export; then\n"+
+		"  echo '{\"id\":1,\"uuid\":\"x\",\"description\":\"d\",\"status\":\"pending\",\"entry\":\"\",\"priority\":\"\",\"urgency\":0}'\n"+
+		"  exit 0\n"+
+		"fi\n"+
+		"echo \"$@\" >> %s\n", logFile)
+
+	if err := os.WriteFile(taskPath, []byte(script), 0o755); err != nil {
+		t.Fatal(err)
+	}
+
+	origPath := os.Getenv("PATH")
+	os.Setenv("PATH", tmp+":"+origPath)
+	t.Cleanup(func() { os.Setenv("PATH", origPath) })
+
+	os.Setenv("TASKDATA", tmp)
+	os.Setenv("TASKRC", "/dev/null")
+	t.Cleanup(func() {
+		os.Unsetenv("TASKDATA")
+		os.Unsetenv("TASKRC")
+	})
+
+	m, err := New("")
+	if err != nil {
+		t.Fatalf("New: %v", err)
+	}
+
+	mv, _ := m.Update(tea.KeyMsg{Type: tea.KeyRunes, Runes: []rune{'D'}})
+	m = mv.(Model)
+	mv, _ = m.Update(tea.KeyMsg{Type: tea.KeyRunes, Runes: []rune{'U'}})
+	m = mv.(Model)
+
+	data, err := os.ReadFile(logFile)
+	if err != nil {
+		t.Fatalf("read log: %v", err)
+	}
+
+	lines := strings.Split(strings.TrimSpace(string(data)), "\n")
+	if len(lines) < 2 {
+		t.Fatalf("expected at least two commands, got %d", len(lines))
+	}
+	if lines[0] != "1 done" {
+		t.Fatalf("done not called: %q", lines[0])
+	}
+	if lines[1] != "1 modify status:pending" {
+		t.Fatalf("undo not called: %q", lines[1])
+	}
+}
+
 func TestDueDateHotkey(t *testing.T) {
 	tmp := t.TempDir()
 	taskPath := filepath.Join(tmp, "task")
-- 
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