@@ -13,6 +13,8 @@ use crate::view::View;
1313/// state (usually by creating and applying a transaction).
1414pub type Command = fn(view: &mut View, count: usize);
1515
16+const PADDING: usize = 5;
17+
1618pub fn move_char_left(view: &mut View, count: usize) {
1719 // TODO: use a transaction
1820 let selection = view
@@ -117,6 +119,74 @@ pub fn move_next_word_end(view: &mut View, count: usize) {
117119 view.state.selection = Selection::single(pos, pos);
118120}
119121
122+pub fn move_file_start(view: &mut View, _count: usize) {
123+ // TODO: use a transaction
124+ view.state.selection = Selection::single(0, 0);
125+
126+ view.state.mode = Mode::Normal;
127+}
128+
129+pub fn move_file_end(view: &mut View, _count: usize) {
130+ // TODO: use a transaction
131+ let text = &view.state.doc;
132+ let last_line = text.line_to_char(text.len_lines().saturating_sub(2));
133+ view.state.selection = Selection::single(last_line, last_line);
134+
135+ view.state.mode = Mode::Normal;
136+}
137+
138+pub fn check_cursor_in_view(view: &mut View) -> bool {
139+ let cursor = view.state.selection().cursor();
140+ let line = view.state.doc().char_to_line(cursor);
141+ let document_end = view.first_line + view.size.1.saturating_sub(1) as usize;
142+
143+ if (line > document_end.saturating_sub(PADDING)) | (line < view.first_line + PADDING) {
144+ return false;
145+ }
146+ true
147+}
148+
149+pub fn page_up(view: &mut View, _count: usize) {
150+ view.first_line = view.first_line.saturating_sub(view.size.1 as usize);
151+
152+ if !check_cursor_in_view(view) {
153+ let text = view.state.doc();
154+ let pos = text.line_to_char(view.last_line().saturating_sub(PADDING as usize));
155+ view.state.selection = Selection::single(pos, pos);
156+ }
157+}
158+
159+pub fn page_down(view: &mut View, _count: usize) {
160+ view.first_line += view.size.1 as usize + PADDING;
161+
162+ if view.first_line < view.state.doc().len_lines() {
163+ let text = view.state.doc();
164+ let pos = text.line_to_char(view.first_line as usize);
165+ view.state.selection = Selection::single(pos, pos);
166+ }
167+}
168+
169+pub fn half_page_up(view: &mut View, _count: usize) {
170+ view.first_line = view.first_line.saturating_sub(view.size.1 as usize / 2);
171+
172+ if !check_cursor_in_view(view) {
173+ let text = &view.state.doc;
174+ let pos = text.line_to_char(view.last_line() - PADDING as usize);
175+ view.state.selection = Selection::single(pos, pos);
176+ }
177+}
178+
179+pub fn half_page_down(view: &mut View, _count: usize) {
180+ let lines = view.state.doc().len_lines();
181+ if view.first_line < lines.saturating_sub(view.size.1 as usize) {
182+ view.first_line += view.size.1 as usize / 2;
183+ }
184+ if !check_cursor_in_view(view) {
185+ let text = view.state.doc();
186+ let pos = text.line_to_char(view.first_line as usize);
187+ view.state.selection = Selection::single(pos, pos);
188+ }
189+}
120190// avoid select by default by having a visual mode switch that makes movements into selects
121191
122192pub fn extend_char_left(view: &mut View, count: usize) {
@@ -292,6 +362,10 @@ pub fn normal_mode(view: &mut View, _count: usize) {
292362 }
293363}
294364
365+pub fn goto_mode(view: &mut View, _count: usize) {
366+ view.state.mode = Mode::Goto;
367+}
368+
295369// TODO: insert means add text just before cursor, on exit we should be on the last letter.
296370pub fn insert_char(view: &mut View, c: char) {
297371 let c = Tendril::from_char(c);