Single quotes prevent interpolation

[ngirard]

let pwd = env::var("PWD").unwrap();
cmd!("echo 'Hello from {pwd}'").run()?;

produces

Hello from {pwd}

instead of the expected

Hello from /home/ngirard/....

[matklad]

I wouldn't say that this is an explicitly designed behavior, but I think it is reasonable. The shell works that way, there's no interpolation in single quotes.

let pwd = env::var("PWD").unwrap();
cmd!("echo 'Hello from '{pwd}").run()?;

will do what you want

[ngirard]

Well, I'm not sure it's the most readable & comfortable option...

Let's take another example: notify-send expects the string to be displayed to be given as a single argument.
What would then be the equivalent Xshell cmd! statement to the following shell command ?

notify-send "Hello from $PWD"

[matklad]

cmd!(“notify-send 'Hello from '{PWD}“)

Adjacent tokens are concated into a single arg. But I do agree that this is kinda silly. I think I need to bite the bullet and implement proper escapensequences and double quoted strings, so that your example just works.

[ngirard]

I think that would be a valuable improvement.

Thanks in advance !

[azzamsa]

The shell works that way, there's no interpolation in single quotes

So it is okay to close this issue.