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digitalmars.D.learn - Run a command-line process with data sent, and retrieve the data.

reply Chris Katko <ckatko gmail.com> writes:
I want to pipe in string data to a shell/commandline program, 
then retrieve the output. But the documentation I read appears to 
only show usage for 'Files' for stdin/stdout/stderr.

ala something like this:
````D
string input = "hello\nworld";
string output;
runProcess("grep hello", input, output);
assert(output = "hello");
````
Jun 10 2022
next sibling parent Chris Katko <ckatko gmail.com> writes:
On Friday, 10 June 2022 at 17:37:30 UTC, Chris Katko wrote:

 I want to pipe in string data to a shell/commandline program, 
 then retrieve the output. But the documentation I read appears 
 to only show usage for 'Files' for stdin/stdout/stderr.

 ala something like this:
 ````D
 string input = "hello\nworld";
 string output;
 runProcess("grep hello", input, output);
 assert(output = "hello");
 ````


Okay that's probably incorrect grep, but you get the point.
Jun 10 2022
prev sibling parent reply =?UTF-8?Q?Ali_=c3=87ehreli?= <acehreli yahoo.com> writes:
On 6/10/22 10:37, Chris Katko wrote:

 I want to pipe in string data to a shell/commandline program, then
 retrieve the output. But the documentation I read appears to only show
 usage for 'Files' for stdin/stdout/stderr.

 ala something like this:
 ````D
 string input = "hello\nworld";
 string output;
 runProcess("grep hello", input, output);
 assert(output = "hello");
 ````


   https://dlang.org/library/std/process/pipe_process.html

Ali
Jun 10 2022
parent reply =?UTF-8?Q?Ali_=c3=87ehreli?= <acehreli yahoo.com> writes:
On 6/10/22 10:40, Ali Çehreli wrote:


    https://dlang.org/library/std/process/pipe_process.html


I realized you may be happier with the following if all you need is stdout:

   https://dlang.org/library/std/process/execute.html
   https://dlang.org/library/std/process/execute_shell.html

Ali
Jun 10 2022
parent Christopher Katko <ckatko gmail.com> writes:
On Friday, 10 June 2022 at 17:49:20 UTC, Ali Çehreli wrote:

 On 6/10/22 10:40, Ali Çehreli wrote:


    https://dlang.org/library/std/process/pipe_process.html


 I realized you may be happier with the following if all you 
 need is stdout:

   https://dlang.org/library/std/process/execute.html
   https://dlang.org/library/std/process/execute_shell.html

 Ali


pipeShell works great! It even allowed me to keep the process 
running "live" in a streaming mode which was going to be a later 
modification so I don't have to keep invoking it over and over.

I'm using it at the moment, to run a prettyprinter for a console 
output, but one prettyprinter just straight up calls Python 
Pygments which can run in streaming mode and while it was 
surprisingly fast being called for every single line, it's 
certainly going to be faster without the overhead of constantly 
spawning a python instance.

Thanks!
Jun 10 2022