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Magnetic redraw behaviour - scroll - scrollbackbuffer program for st |
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git clone git://git.suckless.org/scroll |
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README |
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LICENSE |
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--- |
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commit 8afdc10fd50174fc2f567d371401834277bf1c40 |
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parent d65e29260f83ac1d9d5fe128540f0079638b4e1a |
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Author: Jochen Sprickerhof <[email protected]> |
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Date: Sat, 25 Apr 2020 22:33:46 +0200 |
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Magnetic redraw behaviour |
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Diffstat: |
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M scroll.c | 21 ++++++++++++++------- |
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1 file changed, 14 insertions(+), 7 deletions(-) |
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--- |
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diff --git a/scroll.c b/scroll.c |
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@@ -254,16 +254,19 @@ redraw() |
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{ |
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int rows = 0, x, y; |
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+ if (bottom == NULL) |
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+ return; |
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+ |
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getcursorposition(&x, &y); |
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+ if (y < ws.ws_row-1) |
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+ y--; |
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+ |
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/* wind back bottom pointer by shown history */ |
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for (; bottom != NULL && TAILQ_NEXT(bottom, entries) != NULL && |
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- rows < y - 2; rows++) |
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+ rows < y - 1; rows++) |
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bottom = TAILQ_NEXT(bottom, entries); |
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- if (rows == 0) |
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- return; |
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- |
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/* clear screen */ |
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dprintf(STDOUT_FILENO, "\033[2J"); |
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/* set cursor position to upper left corner */ |
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@@ -275,12 +278,16 @@ redraw() |
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else |
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write(STDOUT_FILENO, bottom->buf, bottom->size); |
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- for (; rows > 0; rows--) { |
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+ for (rows = ws.ws_row; rows > 0 && |
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+ TAILQ_PREV(bottom, tailhead, entries) != NULL; rows--) { |
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bottom = TAILQ_PREV(bottom, tailhead, entries); |
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write(STDOUT_FILENO, bottom->buf, bottom->size); |
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} |
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- /* add new line in front of the shell prompt */ |
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- write(STDOUT_FILENO, "\n", 1); |
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+ |
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+ if (bottom == TAILQ_FIRST(&head)) |
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+ write(STDOUT_FILENO, "\n", 1); |
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+ else |
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+ bottom = TAILQ_NEXT(bottom, entries); |
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} |
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void |
