tree 094d3f8937dfc9da30ef7f9ab3cd666e3d45080a
parent e1863c7d7cf84e3a5ef4eaa880f024c94202eb84
author Tom de Vries <tdevries@suse.de> 1727177175 +0200
committer Tom de Vries <tdevries@suse.de> 1727177175 +0200

[gdb/cli] Show readline wrapping mode for maint info screen

With the same trigger patch adding "set horizontal-scroll-mode on" to INPUTRC
as used in commit 250f1bbaf33 ("[gdb/testsuite] Fix gdb.tui/wrap-line.exp with
wrapping disabled"), we can easily reproduce a failure in
gdb.tui/wrap-line.exp mentioned in PR testsuite/31201:
...
(gdb) 78901234567890123456789012345678901234567890123456789012345678901234567^M<890123456789012345678901234567890123456789012345678                         ^H^H^H^H^H^H^H^H^H^H^H^H^H^H^H^H^H^H^H^H^H^H^H^H^H9WFAIL: gdb.base/wrap-line.exp: term=ansi: width-hard-coded: wrap (timeout)
...

The test-case expects wrapping, but that's disabled by horizontal-scroll-mode.

Add a new line to "maint info screen", that describes the current readline
wrapping mode, and use it in the test-case to handle the different cases.

The reported values for the wrapping mode are as follows.

Unsupported because of running in batch mode:
...
$ gdb -q -batch -ex "maint info screen"
Readline wrapping mode: unsupported (gdb batch mode).
...

Unsupported because the terminal is not capable to move the cursor up:
...
$ TERM=dumb gdb -q -ex "maint info screen" -ex q
Readline wrapping mode: unsupported (terminal is not Cursor Up capable).
...

Disabled by horizontal-scroll-mode:
...
$ grep horizontal-scroll-mode ~/.inputrc
set horizontal-scroll-mode on
$ gdb -q -ex "maint info screen" -ex q
Readline wrapping mode: disabled (horizontal-scroll-mode).
...

Wrap done by readline because terminal is not auto wrap capable:
...
$ TERM=ansi gdb -q -ex "maint info screen" -ex q
Readline wrapping mode: readline (terminal is not auto wrap capable, last column reserved).
...

Wrap done by terminal autowrap:
...
$ TERM=xterm gdb -q -ex "maint info screen" -ex q
Readline wrapping mode: terminal (terminal is auto wrap capable).
...

Tested on x86_64-linux.

Co-Authored-By: Bernd Edlinger <bernd.edlinger@hotmail.de>
Approved-By: Tom Tromey <tom@tromey.com>

Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=31201