Add movements 'H', 'M', 'L'

H moves to the n-th window line from top
M moves to the middle window line
L moves to the n-th window line from bottom

4 files changed, 36 insertions, 0 deletions

diff --git a/config.def.h b/config.def.h
index 8206cac..c748780 100644
--- a/config.def.h
+++ b/config.def.h
@@ -129,6 +129,9 @@ static KeyBinding vis_movements[] = {
 	{ { NONE('|')               }, movement, { .i = MOVE_COLUMN            } },
 	{ { NONE('n')               }, movement, { .i = MOVE_SEARCH_FORWARD    } },
 	{ { NONE('N')               }, movement, { .i = MOVE_SEARCH_BACKWARD   } },
+	{ { NONE('H')               }, movement, { .i = MOVE_WINDOW_LINE_TOP   } },
+	{ { NONE('M')               }, movement, { .i = MOVE_WINDOW_LINE_MIDDLE} },
+	{ { NONE('L')               }, movement, { .i = MOVE_WINDOW_LINE_BOTTOM} },
 	{ { NONE('f')               }, movement_key, { .i = MOVE_RIGHT_TO      } },
 	{ { NONE('F')               }, movement_key, { .i = MOVE_LEFT_TO       } },
 	{ { NONE('t')               }, movement_key, { .i = MOVE_RIGHT_TILL    } },
diff --git a/vis.c b/vis.c
index 8f8b78c..d45c4c8 100644
--- a/vis.c
+++ b/vis.c
@@ -196,6 +196,9 @@ enum {
 	MOVE_MARK_LINE,
 	MOVE_SEARCH_FORWARD,
 	MOVE_SEARCH_BACKWARD,
+	MOVE_WINDOW_LINE_TOP,
+	MOVE_WINDOW_LINE_MIDDLE,
+	MOVE_WINDOW_LINE_BOTTOM,
 };
 
 /** movements which can be used besides the one in text-motions.h and window.h */
@@ -218,6 +221,12 @@ static size_t till_left(const Arg *arg);
 static size_t line(const Arg *arg);
 /* goto to byte action.count on current line */
 static size_t column(const Arg *arg);
+/* goto the action.count-th line from top of the focused window */
+static size_t window_line_top(const Arg *arg);
+/* goto the start of middle line of the focused window */
+static size_t window_line_middle(const Arg *arg);
+/* goto the action.count-th line from bottom of the focused window */
+static size_t window_line_bottom(const Arg *arg);
 
 static Movement moves[] = {
 	[MOVE_LINE_UP]         = { .win = window_line_up                                   },
@@ -251,6 +260,9 @@ static Movement moves[] = {
 	[MOVE_MARK_LINE]       = { .cmd = mark_line_goto,       .type = LINEWISE           },
 	[MOVE_SEARCH_FORWARD]  = { .cmd = search_forward,       .type = LINEWISE           },
 	[MOVE_SEARCH_BACKWARD] = { .cmd = search_backward,      .type = LINEWISE           },
+	[MOVE_WINDOW_LINE_TOP]    = { .cmd = window_line_top,   .type = LINEWISE           },
+	[MOVE_WINDOW_LINE_MIDDLE] = { .cmd = window_line_middle,.type = LINEWISE           },
+	[MOVE_WINDOW_LINE_BOTTOM] = { .cmd = window_line_bottom,.type = LINEWISE           },
 };
 
 /* these can be passed as int argument to textobj(&(const Arg){ .i = TEXT_OBJ_* }) */
@@ -504,6 +516,18 @@ static size_t column(const Arg *arg) {
 	return it.pos;
 }
 
+static size_t window_line_top(const Arg *arg) {
+	return window_line_goto(vis->win->win, action.count);
+}
+
+static size_t window_line_middle(const Arg *arg) {
+	return window_line_goto(vis->win->win, vis->win->height / 2);
+}
+
+static size_t window_line_bottom(const Arg *arg) {
+	return window_line_goto(vis->win->win, vis->win->height - action.count);
+}
+
 /** key bindings functions of type: void (*func)(const Arg*) */
 
 static void repeat(const Arg *arg) {
diff --git a/window.c b/window.c
index e9ab2d5..166d257 100644
--- a/window.c
+++ b/window.c
@@ -749,3 +749,10 @@ void window_cursor_watch(Win *win, void (*cursor_moved)(Win*, void *), void *dat
 	win->cursor_moved = cursor_moved;
 	win->cursor_moved_data = data;
 }
+
+size_t window_line_goto(Win *win, int n) {
+	size_t pos = win->start;
+	for (Line *line = win->topline; --n > 0 && line != win->lastline; line = line->next)
+		pos += line->len;
+	return pos;
+}
diff --git a/window.h b/window.h
index e7d5b0b..d575341 100644
--- a/window.h
+++ b/window.h
@@ -33,6 +33,8 @@ size_t window_char_next(Win*);
 size_t window_char_prev(Win*);
 size_t window_line_down(Win*);
 size_t window_line_up(Win*);
+/* place the cursor at the start ot the n-th window line, counting from 1 */
+size_t window_line_goto(Win*, int n);
 
 /* get cursor position in bytes from start of the file */
 size_t window_cursor_get(Win*);