I need to execute a program and capture stdout, which I hoped std.process.execute would do. But unfortunatly this command also captures stderr, which I need to be ignored. When looking at the implementation of std.process.execute I see, that I can probably do this by removing "Redirect.stderrToStdout" in the function executeImpl. But for that I have to copy lots of functions from phobos in my own code. Is there an easier way to do that?

In case you wonder why I need this: I'm currently using a PHP frontend and a D backend. I'm calling the D routines with the PHP exec command which works fine, but unfortunately removes trailing whitespaces, that I need. Therefore I'd like to have a wrapper that replaces all whitespace by some escape sequences which than are restored in PHP. First I thought I can use sed for that, but unfortunately the return code gets lost here. I'm using stderr to show some progress information, which should be shown immediately. (I've you've got other ideas how to get arround this design flaw (as I see it) in php exec, I'd be happy too.)

I don't want to touch the D backend - that's not the place, where the problem lies and when I decide to change the frontend I've to remember to change the backend too, which I don't like.

Here my complete program:

> import std.process;
> import std.stdio;
> import std.array;
> 
> int main(string[] args)
> {
>     const result = execute(args[1..$]);
>     writeln(result[1].replace("\\","\\\\").replace(" ","\\s"));
>     return result[0];
> }

On Thursday, 20 September 2018 at 07:24:52 UTC, berni wrote:
> I need to execute a program and capture stdout, which I hoped std.process.execute would do. But unfortunatly this command also captures stderr, which I need to be ignored. When looking at the implementation of std.process.execute I see, that I can probably do this by removing "Redirect.stderrToStdout" in the function executeImpl. But for that I have to copy lots of functions from phobos in my own code. Is there an easier way to do that?
>
> [...]
>
> Here my complete program:
>
>> import std.process;
>> import std.stdio;
>> import std.array;
>> 
>> int main(string[] args)
>> {
>>     const result = execute(args[1..$]);
>>     writeln(result[1].replace("\\","\\\\").replace(" ","\\s"));
>>     return result[0];
>> }

Looks like `Config.stderrPassThrough` [1] should do what you want:

    const result = execute(args[1..$], null, Config.stdErrPassThrough);

[1] https://dlang.org/phobos/std_process.html#.Config.stderrPassThrough

On Thursday, 20 September 2018 at 07:36:06 UTC, Paul Backus wrote:
> Looks like `Config.stderrPassThrough` [1] should do what you want:
>
>     const result = execute(args[1..$], null, Config.stdErrPassThrough);
>
> [1] https://dlang.org/phobos/std_process.html#.Config.stderrPassThrough

In theory that looks good. Unfortunatley it's a relativly young feature which my compilers don't know about yet (dmd 2.079 and ldc based on an even older version of dmd). So in practice I'll probably have to wait until the next release cycle of debian in spring 2019... (maybe for the time being I'll update dmd and use dmd for this small part instead of ldc, but I yet don't know how to tell CMake to use dmd for this one file... But I'll probably figure this out.)

On 9/20/18 4:02 AM, berni wrote:
> On Thursday, 20 September 2018 at 07:36:06 UTC, Paul Backus wrote:
>> Looks like `Config.stderrPassThrough` [1] should do what you want:
>>
>>     const result = execute(args[1..$], null, Config.stdErrPassThrough);
>>
>> [1] https://dlang.org/phobos/std_process.html#.Config.stderrPassThrough
> 
> In theory that looks good. Unfortunatley it's a relativly young feature which my compilers don't know about yet (dmd 2.079 and ldc based on an even older version of dmd). So in practice I'll probably have to wait until the next release cycle of debian in spring 2019... (maybe for the time being I'll update dmd and use dmd for this small part instead of ldc, but I yet don't know how to tell CMake to use dmd for this one file... But I'll probably figure this out.)
> 

Hm... 2.079.0 had it:

https://docarchives.dlang.io/v2.079.0/phobos/std_process.html#.Config.stderrPassThrough

I don't know what your "older version of dmd" was, but the earliest I can see it is 2.077.0.

Indeed, it was fixed in 2.077 (look for Bugzilla 17844 here: https://dlang.org/changelog/2.077.0.html)

-Steve

On Thursday, 20 September 2018 at 14:10:44 UTC, Steven Schveighoffer wrote:
> Hm... 2.079.0 had it:

Sorry, I made a mistake while testing and after I found out, that it was not available in the documentation at dpldocs.info I concluded, that it must be a really new feature. But now it seems to me, that dpldocs is outdated a little bit, isn't it?

Meanwhile I've got the latest version of dmd and made it working.

On Friday, 21 September 2018 at 06:08:39 UTC, berni wrote:
> Sorry, I made a mistake while testing and after I found out, that it was not available in the documentation at dpldocs.info I concluded, that it must be a really new feature. But now it seems to me, that dpldocs is outdated a little bit, isn't it?

Oh yeah, I haven't updated Phobos on it for a while, my attention most this year has been the dub thingy. Just did though.