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digitalmars.D.learn - Is it possible to execute a function inside .d script that has no main

reply BoQsc <vaidas.boqsc gmail.com> writes:
Here I have a file named: module.d


import std.stdio   : writeln;

void interestingFunction(){
	writeln("Testing");
}


There is no main() function since, I want to import this module, 
into another .d file.

( If I try to import and module.d does have main() function I get 
this error: )

 otherFile.d(13): Error: only one main, WinMain, or DllMain 
 allowed. Previously found main at module.d(3)






I would like to launch function "interestingFunction()" directly 
using rdmd.
Is it possible to achieve that by any way?





I tried to launch the whole file, but it gave me some weird 
output:

C:\Users\User\Desktop\Environment variables>rdmd module.d
OPTLINK (R) for Win32  Release 8.00.17
Copyright (C) Digital Mars 1989-2013  All rights reserved.
http://www.digitalmars.com/ctg/optlink.html
OPTLINK : Warning 134: No Start Address
Jul 11 2019
parent reply Alex <sascha.orlov gmail.com> writes:
On Thursday, 11 July 2019 at 09:43:55 UTC, BoQsc wrote:

 Here I have a file named: module.d


import std.stdio   : writeln;

void interestingFunction(){
	writeln("Testing");
}


 There is no main() function since, I want to import this 
 module, into another .d file.

 ( If I try to import and module.d does have main() function I 
 get this error: )

 otherFile.d(13): Error: only one main, WinMain, or DllMain 
 allowed. Previously found main at module.d(3)






 I would like to launch function "interestingFunction()" 
 directly using rdmd.
 Is it possible to achieve that by any way?





 I tried to launch the whole file, but it gave me some weird 
 output:

C:\Users\User\Desktop\Environment variables>rdmd module.d
OPTLINK (R) for Win32  Release 8.00.17
Copyright (C) Digital Mars 1989-2013  All rights reserved.
http://www.digitalmars.com/ctg/optlink.html
OPTLINK : Warning 134: No Start Address




If you are trying to test a function separately from other 
functions, e.g. for testing, then you are approaching unit 
testing.
You could write a unit test block just under the function to test 
like
unittest
{
   interestingFunction;
}

and launch it via rdmd... don't know the syntax right now. But 
here is something:
https://stackoverflow.com/questions/10694994/rdmd-is-not-running-unit-tests

So, I assume something like
rdmd -unittest --main module.d
Jul 11 2019
parent BoQsc <vaidas.boqsc gmail.com> writes:
On Thursday, 11 July 2019 at 10:41:38 UTC, Alex wrote:

 On Thursday, 11 July 2019 at 09:43:55 UTC, BoQsc wrote:

 Here I have a file named: module.d


[...]


 There is no main() function since, I want to import this 
 module, into another .d file.

 ( If I try to import and module.d does have main() function I 
 get this error: )

 [...]






 I would like to launch function "interestingFunction()" 
 directly using rdmd.
 Is it possible to achieve that by any way?





 I tried to launch the whole file, but it gave me some weird 
 output:

[...]




 If you are trying to test a function separately from other 
 functions, e.g. for testing, then you are approaching unit 
 testing.
 You could write a unit test block just under the function to 
 test like
 unittest
 {
   interestingFunction;
 }

 and launch it via rdmd... don't know the syntax right now. But 
 here is something:
 https://stackoverflow.com/questions/10694994/rdmd-is-not-running-unit-tests

 So, I assume something like
 rdmd -unittest --main module.d


Hmm, maybe I'll just rename module.d to module_library.d and 
place it in a folder,
then create a new module_run.d file that would launch the 
functions of module_library.d


 module\module_library.d
 module\module_run.d
 README.md


Maybe even place a README.md file explaining how I come up with 
this idea.

And when in need of executing it, I'll just type:

 rdmd module\module_run.d
Jul 12 2019