feat(textarea): get the word under the cursor (#814)

* feat(textarea): get the word under the cursor

* fix: lint

* Update textarea/textarea_test.go

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* test: fix

Signed-off-by: Carlos Alexandro Becker <caarlos0@users.noreply.github.com>

---------

Signed-off-by: Carlos Alexandro Becker <caarlos0@users.noreply.github.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: caarlos0

filepicker/filepicker.go

@@ -518,9 +518,9 @@ func (m Model) canSelect(file string) bool {
 }
 
 // HighlightedPath returns the path of the currently highlighted file or directory.
-func (M Model) HighlightedPath() string {
-	if len(M.files) == 0 || M.selected < 0 || M.selected >= len(M.files) {
+func (m Model) HighlightedPath() string {
+	if len(m.files) == 0 || m.selected < 0 || m.selected >= len(m.files) {
 		return ""
 	}
-	return filepath.Join(M.CurrentDirectory, M.files[M.selected].Name())
+	return filepath.Join(m.CurrentDirectory, m.files[m.selected].Name())
 }

textarea/textarea.go

@@ -722,6 +722,41 @@ func (m *Model) Reset() {
 	m.SetCursorColumn(0)
 }
 
+// Word returns the word at the cursor position.
+// A word is delimited by spaces or line-breaks.
+func (m *Model) Word() string {
+	line := m.value[m.row]
+	col := m.col - 1
+
+	if col < 0 {
+		return ""
+	}
+
+	// If cursor is beyond the line, return empty string
+	if col >= len(line) {
+		return ""
+	}
+
+	// If cursor is on a space, return empty string
+	if unicode.IsSpace(line[col]) {
+		return ""
+	}
+
+	// Find the start of the word by moving left
+	start := col
+	for start > 0 && !unicode.IsSpace(line[start-1]) {
+		start--
+	}
+
+	// Find the end of the word by moving right
+	end := col
+	for end < len(line) && !unicode.IsSpace(line[end]) {
+		end++
+	}
+
+	return string(line[start:end])
+}
+
 // san initializes or retrieves the rune sanitizer.
 func (m *Model) san() runeutil.Sanitizer {
 	if m.rsan == nil {

textarea/textarea_test.go

@@ -1738,6 +1738,62 @@ func TestView(t *testing.T) {
 	}
 }
 
+func TestWord(t *testing.T) {
+	textarea := newTextArea()
+
+	textarea.SetHeight(3)
+	textarea.SetWidth(20)
+	textarea.CharLimit = 500
+
+	textarea, _ = textarea.Update(nil)
+
+	t.Run("regular input", func(t *testing.T) {
+		input := "Word1 Word2 Word3 Word4"
+		for _, k := range input {
+			textarea, _ = textarea.Update(keyPress(k))
+			textarea.View()
+		}
+
+		expect := "Word4"
+		if word := textarea.Word(); word != expect {
+			t.Fatalf("Expected last word to be '%s', got '%s'", expect, word)
+		}
+	})
+
+	t.Run("navigate", func(t *testing.T) {
+		for _, k := range []tea.KeyPressMsg{
+			{Code: tea.KeyLeft, Mod: tea.ModAlt, Text: "alt+left"},
+			{Code: tea.KeyLeft, Mod: tea.ModAlt, Text: "alt+left"},
+			{Code: tea.KeyRight, Text: "right"},
+		} {
+			textarea, _ = textarea.Update(k)
+			textarea.View()
+		}
+
+		expect := "Word3"
+		if word := textarea.Word(); word != expect {
+			t.Fatalf("Expected last word to be '%s', got '%s'", expect, word)
+		}
+	})
+
+	t.Run("delete", func(t *testing.T) {
+		for _, k := range []tea.KeyPressMsg{
+			{Code: tea.KeyEnd, Text: "end"},
+			{Code: tea.KeyBackspace, Mod: tea.ModAlt, Text: "alt+backspace"},
+			{Code: tea.KeyBackspace, Mod: tea.ModAlt, Text: "alt+backspace"},
+			{Code: tea.KeyBackspace, Text: "backspace"},
+		} {
+			textarea, _ = textarea.Update(k)
+			textarea.View()
+		}
+
+		expect := "Word2"
+		if word := textarea.Word(); word != expect {
+			t.Fatalf("Expected last word to be '%s', got '%s'", expect, word)
+		}
+	})
+}
+
 func newTextArea() Model {
 	textarea := New()