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monitor: Add clear command

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The monitor screen can be cluttered after executing commands
like `info qtree`. It is useful to have a command to clear
current screen, just like linux `clear` command do.

This patch has been tested under monitors using stdio, vc,
tcp socket, unix socket and serial interfaces.

Signed-off-by: Alano Song <AlanoSong@163.com>
Reviewed-by: Dr. David Alan Gilbert <dave@treblig.org>
Signed-off-by: Dr. David Alan Gilbert <dave@treblig.org>
Message-ID: <20260504174914.122607-5-dave@treblig.org>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
This commit is contained in:
AlanoSong@163.com
2026-05-04 18:49:14 +01:00
committed by Markus Armbruster
parent 675dd677ea
commit ea017f67ce
3 changed files with 26 additions and 0 deletions
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14
hmp-commands.hx
View File

@@ -20,6 +20,20 @@ SRST
Show the help for all commands or just for command *cmd*.
ERST
{
.name = "clear",
.args_type = "",
.params = "",
.help = "clear the monitor screen",
.cmd = hmp_clear,
.flags = "p",
},
SRST
``clear``
Clear the monitor screen.
ERST
{
.name = "commit",
.args_type = "device:B",

1
include/monitor/hmp.h
View File

@@ -165,6 +165,7 @@ void hmp_trace_event(Monitor *mon, const QDict *qdict);
void hmp_trace_file(Monitor *mon, const QDict *qdict);
void hmp_info_trace_events(Monitor *mon, const QDict *qdict);
void hmp_help(Monitor *mon, const QDict *qdict);
void hmp_clear(Monitor *mon, const QDict *qdict);
void hmp_info_help(Monitor *mon, const QDict *qdict);
void hmp_info_sync_profile(Monitor *mon, const QDict *qdict);
void hmp_info_history(Monitor *mon, const QDict *qdict);

11
monitor/hmp-cmds.c
View File

@@ -219,6 +219,17 @@ void hmp_help(Monitor *mon, const QDict *qdict)
hmp_help_cmd(mon, qdict_get_try_str(qdict, "name"));
}
void hmp_clear(Monitor *mon, const QDict *qdict)
{
/*
* Send an ANSI escape sequence:
* "\x1b[H" - move cursor to top-left
* "\x1b[2J" - clear visible screen
* "\x1b[3J" - clear scrollback
*/
monitor_printf(mon, "\x1b[H\x1b[2J\x1b[3J");
}
void hmp_info_help(Monitor *mon, const QDict *qdict)
{
hmp_help_cmd(mon, "info");