vis-lua: add window.viewport range

2 files changed, 8 insertions, 0 deletions

diff --git a/README.md b/README.md
index 19fe88b..a27c982 100644
--- a/README.md
+++ b/README.md
@@ -619,6 +619,7 @@ At this time there exists no API stability guarantees.
    - `map(mode, key, function)` map a Lua function to `key` in `mode`, local to the given window
    - `style_define(id, style)` where `id` is a constant and `style` a string
    - `style(id, start, end)` apply style to file range, will be cleared after every redraw
+   - `viewport` a range denoting the currently visible area of the window
  - `cursor`
    - `line` (1 based), `col` (1 based)
    - `to(line, col)`
diff --git a/vis-lua.c b/vis-lua.c
index 749abaa..1988075 100644
--- a/vis-lua.c
+++ b/vis-lua.c
@@ -594,6 +594,13 @@ static int window_index(lua_State *L) {
 
 	if (lua_isstring(L, 2)) {
 		const char *key = lua_tostring(L, 2);
+
+		if (strcmp(key, "viewport") == 0) {
+			Filerange r = win ? view_viewport_get(win->view) : text_range_empty();
+			pushrange(L, &r);
+			return 1;
+		}
+
 		if (strcmp(key, "file") == 0) {
 			obj_ref_new(L, win->file, "vis.file");
 			return 1;