diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/pardes.zig | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/src/pardes.zig b/src/pardes.zig index c4893b25..eab8aa7e 100644 --- a/src/pardes.zig +++ b/src/pardes.zig @@ -31,6 +31,9 @@ pub const BOX_H: u16 = 1; pub const MINW: u16 = 10; pub const MINH: u16 = 3; pub const PREFIX_W: u16 = 5; +/// vim 'scrolloff': keyboard cursor moves keep this many context rows visible +/// above/below the cursor (clamped at file boundaries and short panes) +const scroll_off = 3; pub const topbar_str = "Kill Newcol Tutor Debug Colors NextColor Dump"; const pane_builtins_str = "Del"; @@ -523,9 +526,19 @@ pub const Pane = struct { } fn ensureCursorVisible(pane: *Pane) void { + // scrolloff margin, shrunk on short panes so the band stays non-empty + const margin: i32 = @min(scroll_off, @divTrunc(@as(i32, pane.rows) - 1, 2)); const off = pane.scroll(); const last = off + @as(i32, pane.rows) - 1; - if (pane.cur_row < off) pane.scrollBy(pane.cur_row - off) else if (pane.cur_row > last) pane.scrollBy(pane.cur_row - last); + if (pane.cur_row < off + margin) { + pane.scrollBy(pane.cur_row - margin - off); // scrollBy clamps at line 0 + } else if (pane.cur_row > last - margin) { + // don't scroll a file past EOF-at-bottom-row (vim's bottom clamp); + // terminals overshoot harmlessly — the vt clamps at the live bottom + var to = pane.cur_row + margin; + if (pane.file) |f| to = @min(to, @as(i32, @intCast(modal.lineCount(f.content) -| 1))); + pane.scrollBy(@max(0, to - last)); + } } /// the last navigable row: file -> last content line; terminal -> viewport bottom |