Add screen redraw regression tests.

regress/screen-redraw-status.sh

@@ -0,0 +1,92 @@
+#!/bin/sh
+
+# Exercise how the client status line affects the window scene drawn by
+# screen-redraw.c. The status line is not part of the scene, but its size and
+# position change the scene's offset and height (status_line_size and the
+# REDRAW_STATUS_TOP flag in screen-redraw.c). The status line content does not
+# matter, so status-format is set empty; only the offset effect is tested.
+#
+# A top/bottom split makes the offset visible: the horizontal border and the
+# pane contents move as the status line grows or changes side.
+#
+# Each scene is rendered in an inner tmux attached inside an outer tmux pane.
+# The outer pane is captured and compared with a golden in screen-redraw-results/.
+#
+# Run with GENERATE=1 to (re)create the golden files.
+
+PATH=/bin:/usr/bin
+TERM=screen
+LC_ALL=C.UTF-8
+export TERM LC_ALL
+
+[ -z "$TEST_TMUX" ] && TEST_TMUX=$(readlink -f ../tmux)
+TMUX="$TEST_TMUX -Ltest -f/dev/null"
+TMUX2="$TEST_TMUX -Ltest2 -f/dev/null"
+RESULTS=screen-redraw-results
+
+TMP=$(mktemp)
+trap "rm -f $TMP; $TMUX kill-server 2>/dev/null; $TMUX2 kill-server 2>/dev/null" \
+	0 1 15
+
+fail() {
+	echo "$*" >&2
+	exit 1
+}
+
+compare() {
+	sleep 1
+	$TMUX capturep -p >$TMP || exit 1
+	if [ -n "$GENERATE" ]; then
+		cp $TMP "$RESULTS/$1.result" || exit 1
+		echo "generated $1"
+	else
+		cmp -s $TMP "$RESULTS/$1.result" || \
+			fail "scene $1 differs from $RESULTS/$1.result"
+	fi
+}
+
+$TMUX kill-server 2>/dev/null
+$TMUX2 kill-server 2>/dev/null
+
+# Inner: a top/bottom split. The window tracks the attached client size, so the
+# status line shrinks/shifts the window scene. Status content is blanked.
+$TMUX2 new -d -x30 -y12 "sh -c 'printf TOP; exec sleep 100'" || exit 1
+$TMUX2 set -g window-size latest || exit 1
+i=0
+while [ $i -le 4 ]; do
+	$TMUX2 set -g status-format[$i] "" || exit 1
+	i=$((i + 1))
+done
+$TMUX2 splitw -v "sh -c 'printf BOT; exec sleep 100'" || exit 1
+
+$TMUX new -d -x30 -y12 || exit 1
+$TMUX set -g status off || exit 1
+$TMUX set -g window-size manual || exit 1
+$TMUX set -g default-terminal "tmux-256color" || exit 1
+$TMUX send -l "$TMUX2 attach" || exit 1
+$TMUX send Enter || exit 1
+sleep 1
+
+# No status line: the window fills the whole client.
+$TMUX2 set -g status off || exit 1
+compare status-off
+
+# One line at the bottom: the scene loses its bottom row.
+$TMUX2 set -g status on || exit 1
+$TMUX2 set -g status-position bottom || exit 1
+compare status-bottom
+
+# One line at the top: the whole scene is shifted down one row.
+$TMUX2 set -g status-position top || exit 1
+compare status-top
+
+# Three lines at the bottom.
+$TMUX2 set -g status 3 || exit 1
+$TMUX2 set -g status-position bottom || exit 1
+compare status-3-bottom
+
+# Three lines at the top: the scene is shifted down three rows.
+$TMUX2 set -g status-position top || exit 1
+compare status-3-top
+
+exit 0