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Show the output from the previous run for more context for the operator

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The previous output is displayed in a dimmed style on systems that support it.

OK tedu@
This commit is contained in:
job
2025-07-09 21:23:28 +00:00
parent 3cb786741c
commit 9cefaeb29e
1 changed files with 30 additions and 1 deletions
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31
usr.bin/watch/watch.c
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@@ -1,4 +1,4 @@
/* $OpenBSD: watch.c,v 1.36 2025/07/06 19:19:56 job Exp $ */
/* $OpenBSD: watch.c,v 1.37 2025/07/09 21:23:28 job Exp $ */
/*
* Copyright (c) 2025 Job Snijders <job@openbsd.org>
* Copyright (c) 2000, 2001 Internet Initiative Japan Inc.
@@ -305,6 +305,34 @@ display(BUFFER *cur, BUFFER *prev, highlight_mode_t hm)
if (!prev || (cur == prev))
hm = HIGHLIGHT_NONE;
attron(A_DIM);
for (line = start_line, screen_y = 2; line < MAXLINE &&
(*prev)[line][0] && screen_y < (show_rusage ? LINES - 9 : LINES);
line++, screen_y++) {
wchar_t *prev_line, *p;
prev_line = (*prev)[line];
for (p = prev_line, cw = 0; cw < start_column; p++)
cw += WCWIDTH(*p);
screen_x = cw - start_column;
move(screen_y, screen_x);
while (screen_x < COLS) {
if (*p && *p != L'\n') {
cw = wcwidth(*p);
if (screen_x + cw >= COLS)
break;
addwch(*p++);
screen_x += cw;
} else
break;
}
}
attroff(A_DIM);
move(1, 1);
for (line = start_line, screen_y = 2;
screen_y < (show_rusage ? LINES - 9 : LINES) && line < MAXLINE
&& (*cur)[line][0]; line++, screen_y++) {
@@ -334,6 +362,7 @@ display(BUFFER *cur, BUFFER *prev, highlight_mode_t hm)
case HIGHLIGHT_NONE:
move(screen_y, screen_x);
clrtoeol();
while (screen_x < COLS) {
if (*p && *p != L'\n') {
cw = wcwidth(*p);