Re: [i3] binding the same key to revert the command?

[Ingo Bürk]

Hi,

one possible solution: save the following as /some/path/stopcont.sh and bind

bindsym $mod+p exec --no-startup-id /some/path/stopcont.sh 

Script:
===
#!/usr/bin/env bash
PROCESS=${1}
FILE="/tmp/${PROCESS}.signal"

if [[ -f "${FILE}" ]]; then
  rm ${FILE}
  pkill -SIGCONT ${PROCESS}
else
  touch ${FILE}
  pkill -SIGSTOP ${PROCESS}
fi
===

This will, of course, assume that the process isn't paused by anything
else as that would make it go out of sync. A better and more robust way
would be to write the script such that it instead uses the information
of /proc//stat to check whether the process is currently paused. If
you use a higher-level language such as Python, you can do this nicely
instead of manually parsing the output. See [1] for some more information.

[1]
http://stackoverflow.com/questions/6021771/is-there-a-way-to-determine-if-a-linux-pid-is-paused-or-not


Ingo

On 11/08/2015 04:16 AM, Zenny wrote:
> Hi,
>
> I am trying to use a keybinding to pause a process temporily,
>
> bindsym $mod+p exec pkill -SIGSTOP 
>
> But I could not figure out how to make pressing to same keybinding to
> restart the process?
>
> Currenlty I am using,
>
> bindsym $mod+c exec pkill -SIGCONT 
>
> Instead, I want something like re-pressing $mod+p executes pkill
> -SIGCONT .
>
> Thanks!
>
> /z

Re: [i3] binding the same key to revert the command?

[Ingo Bürk]

Hi,

sorry, my last email didn't go to the mailing list which I diidn't even
notice until this email. Below is my previous email as a quote which
also has a script using /proc/../stat. Never hurts to have multiple
solutions :)
> Hi,
>
> here's a script using /proc/.../stat. The usage is as before. The only
> assumption now is that the process is running exactly once.
>
> 
> #!/usr/bin/env bash
> PROCESS=${1}
> STATE=$(cat /proc/$(pgrep ${PROCESS})/stat | awk -F' ' '{print $3}')
>
> [[ "${STATE}" = "T" ]] && pkill -SIGCONT ${PROCESS} || pkill -SIGSTOP
> ${PROCESS}
> =



On 11/08/2015 05:22 PM, Joep van Delft wrote:
> Elaborating on Ingo's hints: Something like this could be used to not
> to have
> to maintain the state somewhere on disk:
>
> ===
> #!/usr/bin/env bash
> process_name=$1
> for pid in $(pgrep --exact $process_name); do
> # Assumes there is no space in the command name
> if   awk '$3=="T"{exit 1}' /proc/$pid/stat 2>/dev/null
> then kill -SIGCONT $pid
> else kill -SIGKILL $pid
> fi
> done
> ===
>
>
> Kind regards,
>
> Joep
>
>
> Ingo Bürk schreef op 2015-11-08 10:30:
>> Hi,
>>
>> one possible solution: save the following as /some/path/stopcont.sh
>> and bind
>>
>> bindsym $mod+p exec --no-startup-id /some/path/stopcont.sh
>> 
>>
>> Script:
>> ===
>> #!/usr/bin/env bash
>> PROCESS=${1}
>> FILE="/tmp/${PROCESS}.signal"
>>
>> if [[ -f "${FILE}" ]]; then
>>   rm ${FILE}
>>   pkill -SIGCONT ${PROCESS}
>> else
>>   touch ${FILE}
>>   pkill -SIGSTOP ${PROCESS}
>> fi
>> ===
>>
>> This will, of course, assume that the process isn't paused by anything
>> else as that would make it go out of sync. A better and more robust way
>> would be to write the script such that it instead uses the information
>> of /proc//stat to check whether the process is currently paused. If
>> you use a higher-level language such as Python, you can do this nicely
>> instead of manually parsing the output. See [1] for some more
>> information.
>>
>> [1]
>> http://stackoverflow.com/questions/6021771/is-there-a-way-to-determine-if-a-linux-pid-is-paused-or-not
>>
>>
>>
>> Ingo
>>
>> On 11/08/2015 04:16 AM, Zenny wrote:
>>> Hi,
>>>
>>> I am trying to use a keybinding to pause a process temporily,
>>>
>>> bindsym $mod+p exec pkill -SIGSTOP 
>>>
>>> But I could not figure out how to make pressing to same keybinding to
>>> restart the process?
>>>
>>> Currenlty I am using,
>>>
>>> bindsym $mod+c exec pkill -SIGCONT 
>>>
>>> Instead, I want something like re-pressing $mod+p executes pkill
>>> -SIGCONT .
>>>
>>> Thanks!
>>>
>>> /z

Re: [i3] binding the same key to revert the command?

[Zenny]

Hi Sege,

On 11/8/15, Serge van Ginderachter  wrote:
> I have a script that does that, to pause dunst (whilst locking) and/or
> disabling the autolock screensaver (for a presentation mode).
>
> The trick is to be able to check for a state, which I do by using gtrayicon
> to visually show the current state, so the script can check whether to
> enable or disable the mode.
>
> See https://github.com/srvg/dotfiles/blob/master/bin/presentation-mode

Thanks for the input. Can you explain the usage in my case in particular.

Cheers,
/z

>
> On 8 November 2015 at 10:16, Zenny  wrote:
>
>> Hi,
>>
>> I am trying to use a keybinding to pause a process temporily,
>>
>> bindsym $mod+p exec pkill -SIGSTOP 
>>
>> But I could not figure out how to make pressing to same keybinding to
>> restart the process?
>>
>> Currenlty I am using,
>>
>> bindsym $mod+c exec pkill -SIGCONT 
>>
>> Instead, I want something like re-pressing $mod+p executes pkill
>> -SIGCONT .
>>
>> Thanks!
>>
>> /z
>>
>

Re: [i3] binding the same key to revert the command?

[Joep van Delft]

Elaborating on Ingo's hints: Something like this could be used to not to 
have

to maintain the state somewhere on disk:

===
#!/usr/bin/env bash
process_name=$1
for pid in $(pgrep --exact $process_name); do
# Assumes there is no space in the command name
if   awk '$3=="T"{exit 1}' /proc/$pid/stat 2>/dev/null
then kill -SIGCONT $pid
else kill -SIGKILL $pid
fi
done
===


Kind regards,

Joep


Ingo Bürk schreef op 2015-11-08 10:30:

Hi,

one possible solution: save the following as /some/path/stopcont.sh and 
bind


bindsym $mod+p exec --no-startup-id /some/path/stopcont.sh 



Script:
===
#!/usr/bin/env bash
PROCESS=${1}
FILE="/tmp/${PROCESS}.signal"

if [[ -f "${FILE}" ]]; then
  rm ${FILE}
  pkill -SIGCONT ${PROCESS}
else
  touch ${FILE}
  pkill -SIGSTOP ${PROCESS}
fi
===

This will, of course, assume that the process isn't paused by anything
else as that would make it go out of sync. A better and more robust way
would be to write the script such that it instead uses the information
of /proc//stat to check whether the process is currently paused. 
If

you use a higher-level language such as Python, you can do this nicely
instead of manually parsing the output. See [1] for some more 
information.


[1]
http://stackoverflow.com/questions/6021771/is-there-a-way-to-determine-if-a-linux-pid-is-paused-or-not


Ingo

On 11/08/2015 04:16 AM, Zenny wrote:

Hi,

I am trying to use a keybinding to pause a process temporily,

bindsym $mod+p exec pkill -SIGSTOP 

But I could not figure out how to make pressing to same keybinding to
restart the process?

Currenlty I am using,

bindsym $mod+c exec pkill -SIGCONT 

Instead, I want something like re-pressing $mod+p executes pkill
-SIGCONT .

Thanks!

/z