binutils-gdb/gdb/testsuite/gdb.tui/empty.exp
Andrew Burgess b0fcf3e344 gdb/tui: fairer distribution of excess space during apply
When applying layouts gdb computes the size of each window (or rather,
each sub-layout within a layout) using integer arithmetic.  As this
rounds down the results, then, when all sub-layouts are sized, there
is the possibility that we have some space left over.

Currently, this space is just assigned to an arbitrary sub-layout.

This can result in some unbalanced results.  Consider this set of
steps with current master:

  (gdb) tui enable
  (gdb) layout regs
  (gdb) info win
  Name       Lines Columns Focus
  regs           7      80
  src            9      80 (has focus)
  status         1      80
  cmd            8      80

Notice the weird split between the src and regs windows, the original
layout specification has these windows given equal weight.  The
problem is that, with rounding, both the regs and src windows are
initially sized to 7, the extra 2 lines are then arbitrarily added to
the src window.

In this commit, rather than add all the extra space to one single
window, I instead hand out the extra space 1 line at a time, looping
over all the sub-layouts.  We take care to respect the min/max sizes,
and so, we now get this result:

  (gdb) tui enable
  (gdb) layout regs
  (gdb) info win
  Name       Lines Columns Focus
  regs           8      80
  src            8      80 (has focus)
  status         1      80
  cmd            8      80

This looks more natural to me.

This is obviously a change in behaviour, and so, lots of the existing
tests need to be updated to take this into account.  None of the
changes are huge, it's just a line or two (or column for width) moved
between windows.
2022-04-03 15:31:47 +01:00

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# Copyright 2019-2022 Free Software Foundation, Inc.
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
# Test TUI resizing with empty windows.
tuiterm_env
standard_testfile
Term::clean_restart 24 80
if {![Term::enter_tui]} {
unsupported "TUI not supported"
return
}
# Each entry describes a layout. It has these items:
# 1. Layout name
# 2. Test name
# 3. List of boxes in 80x24 mode
# 4. List of boxes in 90x40 mode
# 5. List of test name and text for the empty window
set layouts {
{src src {{0 0 80 15}} {{0 0 90 26}}
{{"no source" "No Source Available"}}}
{regs src-regs {{0 0 80 8} {0 7 80 8}} {{0 0 90 13} {0 12 90 13}}
{
{"no source" "No Source Available"}
{"no regs" "Register Values Unavailable"}
}}
{asm asm {{0 0 80 15}} {{0 0 90 26}}
{
{"no asm" "No Assembly Available"}
}}
{regs asm-regs {{0 0 80 8} {0 7 80 8}} {{0 0 90 13} {0 12 90 13}}
{
{"no asm" "No Assembly Available"}
{"no regs" "Register Values Unavailable"}
}}
{split split {{0 0 80 8} {0 7 80 8}} {{0 0 90 13} {0 12 90 13}}
{
{"no source" "No Source Available"}
{"no asm" "No Assembly Available"}
}}
{regs split-regs {{0 0 80 8} {0 7 80 8}} {{0 0 90 13} {0 12 90 13}}
{
{"no asm" "No Assembly Available"}
{"no regs" "Register Values Unavailable"}
}}
}
# Helper function to verify a list of boxes.
proc check_boxes {boxes} {
set boxno 1
foreach box $boxes {
eval Term::check_box [list "box $boxno"] $box
incr boxno
}
}
# Helper function to verify text.
proc check_text {text_list} {
set text [Term::get_all_lines]
foreach item $text_list {
lassign $item testname check
if {![gdb_assert {[regexp -- $check $text]} $testname]} {
Term::dump_screen
}
}
}
foreach layout $layouts {
lassign $layout name testname small_boxes large_boxes text_list
with_test_prefix $testname {
Term::command "layout $name"
with_test_prefix 80x24 {
check_boxes $small_boxes
check_text $text_list
}
Term::resize 40 90
with_test_prefix 90x40 {
check_boxes $large_boxes
check_text $text_list
}
Term::resize 24 80
with_test_prefix "80x24 again" {
check_boxes $small_boxes
check_text $text_list
}
}
}