system("cls") works but executeShell doesn't. system is depreciated.

What's going on? The docs say that it creates a new process. I simply want to clear the console!

On 06/26/2016 05:37 PM, Smoke Adams wrote:
> system("cls") works but executeShell doesn't. system is depreciated.

Unsolicited spelling correction: no 'i' in "deprecated".

> What's going on? The docs say that it creates a new process. I simply
> want to clear the console!

`system` directly prints its output, `executeShell` returns it in a tuple with the status code. Maybe cls works by printing some specific clear code. If so, you have to print the output of the command.

This works with `clear` on Linux which seems to behave similarly to Windows' cls:

----
void main()
{
    import std.stdio: write, writeln;
    import std.process: executeShell;
    import std.exception: enforce;
    writeln("A");
    auto r = executeShell("clear");
    enforce(r.status == 0);
    write(r.output);
    writeln("B");
}
----

`wait(spawnShell(...))` is the other suggestion from `system`'s deprecation message. It works for `clear`, too:

----
void main()
{
    import std.stdio: writeln;
    import std.process: spawnShell, wait;
    writeln("A");
    wait(spawnShell("clear"));
    writeln("B");
}
----

On Sunday, 26 June 2016 at 15:37:03 UTC, "Smoke" Adams wrote:
> system("cls") works but executeShell doesn't. system is depreciated.
>
> What's going on? The docs say that it creates a new process. I simply want to clear the console!


I have problem with executeShell on windows 10 (LDC 1.0.0) too.
When I rewrote it into http://prntscr.com/blc9j8 it works.

On Sunday, 26 June 2016 at 17:56:08 UTC, Satoshi wrote:
> On Sunday, 26 June 2016 at 15:37:03 UTC, "Smoke" Adams wrote:
>> system("cls") works but executeShell doesn't. system is depreciated.
>>
>> What's going on? The docs say that it creates a new process. I simply want to clear the console!
>
>
> I have problem with executeShell on windows 10 (LDC 1.0.0) too.
> When I rewrote it into http://prntscr.com/blc9j8 it works.

OT but please, refrain from using screenshots. I know it's very customary on windows but I can't copy paste code from a screenshot to play with it and manually copying is error-prone. We manipulate text, let's stay with it.

On 6/26/16 12:02 PM, ag0aep6g wrote:
> On 06/26/2016 05:37 PM, Smoke Adams wrote:
>> system("cls") works but executeShell doesn't. system is depreciated.

Use spawn-related function, and avoid capturing output instead. Not sure if you need to call spawnShell (which creates a new system shell to execute the command), it depends on whether cls is a shell builtin or an executable.

>
> Unsolicited spelling correction: no 'i' in "deprecated".
>
>> What's going on? The docs say that it creates a new process. I simply
>> want to clear the console!
>
> `system` directly prints its output, `executeShell` returns it in a
> tuple with the status code. Maybe cls works by printing some specific
> clear code. If so, you have to print the output of the command.

Perhaps not exactly correct, but close enough. When you call "executeShell", the subprocess is started with stdout/err sent to a pipe, and no console is passed to the subprocess. Probably cls sees it's not talking to a console and exits.

-Steve

On Sunday, 26 June 2016 at 19:01:07 UTC, cym13 wrote:
> On Sunday, 26 June 2016 at 17:56:08 UTC, Satoshi wrote:
>> On Sunday, 26 June 2016 at 15:37:03 UTC, "Smoke" Adams wrote:
>>> system("cls") works but executeShell doesn't. system is depreciated.
>>>
>>> What's going on? The docs say that it creates a new process. I simply want to clear the console!
>>
>>
>> I have problem with executeShell on windows 10 (LDC 1.0.0) too.
>> When I rewrote it into http://prntscr.com/blc9j8 it works.
>
> OT but please, refrain from using screenshots. I know it's very customary on windows but I can't copy paste code from a screenshot to play with it and manually copying is error-prone. We manipulate text, let's stay with it.

Sorry... It's same function as executeImpl just with changed byChunk to 1. It corrupt stack when I called the original function.

https://github.com/ldc-developers/phobos/blob/aa133b5927bbc5f9669374d5bb0f206f6f68cfe4/std/process.d#L2130

On Sunday, 26 June 2016 at 16:02:18 UTC, ag0aep6g wrote:
> On 06/26/2016 05:37 PM, Smoke Adams wrote:
>> [...]
>
> Unsolicited spelling correction: no 'i' in "deprecated".
>
>> [...]
>
> `system` directly prints its output, `executeShell` returns it in a tuple with the status code. Maybe cls works by printing some specific clear code. If so, you have to print the output of the command.
>
> [...]

neither work but

wait(spawnShell("cls"));