feat/a-A-key-commands

src/view.v

@@ -737,6 +737,7 @@ fn (mut view View) on_key_down(e &tui.Event) {
 				.w     { view.w() }
 				.b     { view.b() }
 				.o     { view.o() }
+				.a     { if e.modifiers == .shift { view.shift_a() } else { view.a() } }
 				.up    { view.k() }
 				.right { view.l() }
 				.down  { view.j() }
@@ -1114,6 +1115,16 @@ fn (mut view View) o() {
 	view.buffer.lines.insert(y+1, "${whitespace_prefix}")
 }
 
+fn (mut view View) a() {
+	view.mode = .insert
+	defer { view.cursor.pos.x++ }
+}
+
+fn (mut view View) shift_a() {
+	view.dollar()
+	view.a()
+}
+
 fn (mut view View) enter() {
 	defer { view.move_cursor_down(1) }
 	mut x := view.cursor.pos.x

src/view_test.v

@@ -592,3 +592,32 @@ fn test_calc_b_move_amount_code_line() {
 	fake_cursor_pos.x -= amount
 	assert fake_line[fake_cursor_pos.x].ascii_str() == "s"
 }
+
+fn test_a_enters_insert_mode_after_cursor_position() {
+	mut fake_view := View{ log: unsafe { nil }, mode: .normal }
+
+	fake_view.buffer.lines = ["single line of text!"]
+
+	fake_view.cursor.pos.x = 0
+
+	fake_view.a()
+
+	assert fake_view.cursor.pos.x == 1
+	assert fake_view.mode == .insert
+}
+
+fn test_shift_a_enters_insert_mode_at_the_end_of_current_line() {
+	mut fake_view := View{ log: unsafe { nil }, mode: .normal }
+
+	fake_view.buffer.lines = ["some line of text", "single line of text!", "a third line!"]
+
+	fake_view.cursor.pos.y = 1
+	// use random starting location, not at the start
+	fake_view.cursor.pos.x = 3
+
+	fake_view.shift_a()
+
+	assert fake_view.cursor.pos.x == 20
+	assert fake_view.cursor.pos.y == 1
+	assert fake_view.mode == .insert
+}