当我按下 Bamboo Ink 笔的顶部按钮时，如何运行命令？

Question 1

我是这样做的：

ACTION=="add" , SUBSYSTEM=="bluetooth", DEVPATH=="/devices/pci0000:00/0000:00:14.0/usb1/1-10/1-10:1.0/bluetooth/hci0/hci0:3585", RUN+="/home/gvb/bin/run-pen-state.sh"

我想要做的是在 Xournal 中在笔和橡皮擦之间切换。下面显示了所需的两个脚本。它们需要两个小实用程序：wmctrl 和 xdotool...

“run-pen-state.sh”的内容是

#!/bin/csh
sudo -u gvb -i /home/gvb/bin/pen-state

而“笔状态”本身是

#!/usr/bin/perl -w

$home=$ENV{'HOME'};
$store=`grep "#state: " ~/bin/pen-state | grep -v store`;
chomp($store);

$command=`export DISPLAY=:0; export XAUTHORITY=$home/.Xauthority; wmctrl -l`;
foreach $line (split(/\n/,$command)){
  if (($line=~ /Xournal/)&&($line=~ /$filename/)){
    $winid=(split(/ /,$line))[0];
  }
}


if($winid){
  system("export DISPLAY=:0; export XAUTHORITY=$home/.Xauthority; wmctrl -i -a $winid");


  if($store =~ /pen/){
    $now="state: eraser";
    system("export DISPLAY=:0; export XAUTHORITY=$home/.Xauthority; xdotool key shift+ctrl+e");
  }else{
    $now="state: pen";
    system("export DISPLAY=:0; export XAUTHORITY=$home/.Xauthority; xdotool key shift+ctrl+p");
  }

  $now="#$now";

  print "$store\n";
  print "$now\n";

  open(SELF,"$home/bin/pen-state");
  read(SELF,$self,-s "$home/bin/pen-state",0);
  close(SELF);
  $self=~ s/$store/$now/;
  open(SELF,">$home/bin/pen-state");
  print SELF $self;
  close(SELF);
}

#state: pen

Answer

我是这样做的：

ACTION=="add" , SUBSYSTEM=="bluetooth", DEVPATH=="/devices/pci0000:00/0000:00:14.0/usb1/1-10/1-10:1.0/bluetooth/hci0/hci0:3585", RUN+="/home/gvb/bin/run-pen-state.sh"

我想要做的是在 Xournal 中在笔和橡皮擦之间切换。下面显示了所需的两个脚本。它们需要两个小实用程序：wmctrl 和 xdotool...

“run-pen-state.sh”的内容是

#!/bin/csh
sudo -u gvb -i /home/gvb/bin/pen-state

而“笔状态”本身是

#!/usr/bin/perl -w

$home=$ENV{'HOME'};
$store=`grep "#state: " ~/bin/pen-state | grep -v store`;
chomp($store);

$command=`export DISPLAY=:0; export XAUTHORITY=$home/.Xauthority; wmctrl -l`;
foreach $line (split(/\n/,$command)){
  if (($line=~ /Xournal/)&&($line=~ /$filename/)){
    $winid=(split(/ /,$line))[0];
  }
}


if($winid){
  system("export DISPLAY=:0; export XAUTHORITY=$home/.Xauthority; wmctrl -i -a $winid");


  if($store =~ /pen/){
    $now="state: eraser";
    system("export DISPLAY=:0; export XAUTHORITY=$home/.Xauthority; xdotool key shift+ctrl+e");
  }else{
    $now="state: pen";
    system("export DISPLAY=:0; export XAUTHORITY=$home/.Xauthority; xdotool key shift+ctrl+p");
  }

  $now="#$now";

  print "$store\n";
  print "$now\n";

  open(SELF,"$home/bin/pen-state");
  read(SELF,$self,-s "$home/bin/pen-state",0);
  close(SELF);
  $self=~ s/$store/$now/;
  open(SELF,">$home/bin/pen-state");
  print SELF $self;
  close(SELF);
}

#state: pen

Question 2

2022 年 2 月更新：
我刚刚注意到，在 Ubuntu 22.04、Kernel 5.16.8 和 Gnome 41.3 中，它可以开箱即用。顶部按钮被检测为Super+AudioMicMute组合，您可以使用它在 Gnome 设置中分配任何快捷方式。但不知道什么时候开始起作用。

原答案：
我的方法与纪尧姆之前的回答几乎相同。但他的答案对我来说的问题是，我找不到办法区分哪个设备触发了蓝牙子系统的添加操作，因此当我通过蓝牙连接任何其他设备时，纪尧姆的简单规则也匹配。但使用我的 Lenovo Active Pen 2，我注意到每当我按下顶部按钮时，就会发生以下两种情况之一。

情况 1) 笔在一两秒内连接和断开。udevadm monitor仅显示添加和删除操作。

情况 2) 在 udev 的添加操作之后，笔被识别为名为 HID联想 Active Pen2 键盘。然后大约需要10秒的时间才能将其移除。

ACTION=="add", SUBSYSTEM=="bluetooth", DEVPATH=="/devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7:1.0/bluetooth/hci0/hci0:3585", RUN+="/usr/local/bin/bluetooth_event_detected.sh add"
ACTION=="remove", SUBSYSTEM=="bluetooth", DEVPATH=="/devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7:1.0/bluetooth/hci0/hci0:3585", RUN+="/usr/local/bin/bluetooth_event_detected.sh remove"
ACTION=="add", SUBSYSTEM=="hid", DEVPATH=="/devices/virtual/misc/uhid/0005:17EF:60A8.*", RUN+="/usr/local/bin/bluetooth_event_detected.sh force"

因此，我在 udev 规则中监视添加和删除操作，这会触发一个脚本，该脚本会计算添加事件和下一个删除事件之间所需的时间。如果花费的时间少于 2 秒，则假定这是笔并在下设置一个标志/tmp/stylus。当笔被识别为 HID 时，情况二也会发生同样的情况。

#!/bin/bash
# PATH is not provided in an udev environment
PATH=/bin:/usr/bin:/usr/local/bin

DIRECTORY=/tmp/stylus
TSFILE=$DIRECTORY/bluetooth_timestamp
BTN_PRESSED_FLAG=$DIRECTORY/stylus_button_pressed
TIME_DELTA="2"  

ACTION=$1
NOW=$(date +%s)


mkdir -p $DIRECTORY 
chmod 777 $DIRECTORY

if [ "$ACTION" = "add" ]; then
        echo $NOW > $TSFILE                   
elif [ "$ACTION" = "remove" ]; then
        ADDED_TS=$(cat $TSFILE)
        DIFF=$(($NOW-$ADDED_TS))
        echo diff: $DIFF
        # if the time between adding and removing is 
        # 2 seconds or less, we assume the stylus button
        # was pressed
        if [ "$DIFF" -le "$TIME_DELTA" ]; then
                touch $BTN_PRESSED_FLAG          
                chmod 666 $BTN_PRESSED_FLAG 
        fi
elif [ "$ACTION" = "force" ]; then
        touch $BTN_PRESSED_FLAG
        chmod 666 $BTN_PRESSED_FLAG
fi

最后，当我登录桌面环境时，我有一个自动启动的简单脚本，它会持续监视/tmp/stylus并执行gnome-screenshot -i.

#!/bin/bash

FILE=/tmp/stylus/stylus_button_pressed
CMD="gnome-screenshot -i"

while true; do
        if [ -f $FILE ]; then
                echo running command
                $CMD
                rm $FILE
        fi
        sleep 0.1
done

不优雅，但工作。

Answer