• Marcone (12/12) Dec 06 2019 import std;
• mipri (7/19) Dec 06 2019 These all work:
• Marcone (2/29) Dec 06 2019 Thank you very much mipri! Work very well!
• Timon Gehr (2/21) Dec 06 2019 alias cmd = compose!(not!(to!bool), wait, spawnShell, to!string);

Marcone <marcone email.com> writes:

import std;

alias cmd = compose!(to!bool, wait, spawnShell, to!string);

void main(){
	writeln(cmd("where notepad.exe"));
}


Result:

C:\Windows\System32\notepad.exe
C:\Windows\notepad.exe
false


The result show "false" because good spawnshell command return 0 
and 0 to bool is false. But I want to invert false to true to get 
true or false if command success.

mipri <mipri minimaltype.com> writes:

On Saturday, 7 December 2019 at 04:00:53 UTC, Marcone wrote:
 import std;

 alias cmd = compose!(to!bool, wait, spawnShell, to!string);

 void main(){
 	writeln(cmd("where notepad.exe"));
 }


 Result:

 C:\Windows\System32\notepad.exe
 C:\Windows\notepad.exe
 false


 The result show "false" because good spawnshell command return 
 0 and 0 to bool is false. But I want to invert false to true to 
 get true or false if command success.

These all work:

alias cmd = compose!(unaryFun!"!a", to!bool, wait, spawnShell, 
to!string);

alias cmd = compose!("!a", to!bool, wait, spawnShell, to!string);

alias cmd = compose!(b => !b, to!bool, wait, spawnShell, 
to!string);

Marcone <marcone email.com> writes:

On Saturday, 7 December 2019 at 04:05:23 UTC, mipri wrote:
 On Saturday, 7 December 2019 at 04:00:53 UTC, Marcone wrote:
 import std;

 alias cmd = compose!(to!bool, wait, spawnShell, to!string);

 void main(){
 	writeln(cmd("where notepad.exe"));
 }


 Result:

 C:\Windows\System32\notepad.exe
 C:\Windows\notepad.exe
 false


 The result show "false" because good spawnshell command return 
 0 and 0 to bool is false. But I want to invert false to true 
 to get true or false if command success.

 These all work:

 alias cmd = compose!(unaryFun!"!a", to!bool, wait, spawnShell, 
 to!string);

 alias cmd = compose!("!a", to!bool, wait, spawnShell, 
 to!string);

 alias cmd = compose!(b => !b, to!bool, wait, spawnShell, 
 to!string);

Thank you very much mipri! Work very well!

Timon Gehr <timon.gehr gmx.ch> writes:

On 07.12.19 05:00, Marcone wrote:
 import std;
 
 alias cmd = compose!(to!bool, wait, spawnShell, to!string);
 
 void main(){
      writeln(cmd("where notepad.exe"));
 }
 
 
 Result:
 
 C:\Windows\System32\notepad.exe
 C:\Windows\notepad.exe
 false
 
 
 The result show "false" because good spawnshell command return 0 and 0 
 to bool is false. But I want to invert false to true to get true or 
 false if command success.

alias cmd = compose!(not!(to!bool), wait, spawnShell, to!string);