Can it figure out what my $HOME is?

[Raj2032]

Lets say if I wanted something like this in my Cargo.toml file:

[dependency]
some_lib = {path = "~/Desktop/some_lib"}

This is obviously not valid as it can't convert ~ to /home/<username>/.

So I was wondering if I understood correctly, would Nickel solve such an issue and actually create a Cargo.toml file by figuring out what is the ~ and then add this bit in: /Desktop/some_lib into the Cargo.toml file?

[vkleen]

Nickel wouldn't automatically do this expansion. But, you could write a Nickel function to do the expansion with the caveat that Nickel doesn't have a builtin to access environment variables:

# test.ncl
let expand_with : String -> String -> String
  = fun home => std.string.replace_regex "^~/" "%{home}/"
  in
{
  HOME
    | String
    | not_exported,
  dependency.some_lib.path = expand_with HOME "~/Desktop/some_lib"
}

and export to TOML using

nickel export --format toml <<< "(import \"test.ncl\") & { HOME = \"$HOME\" }"

You would then have to somehow arrange for this export to happen before calling anything that needs Cargo.toml. So this can be done, but the UI isn't particularly friendly at the moment.

[yannham]

I think it would be more idiomatic to simply interpolate HOME directly:

{
  HOME
    | String
    | not_exported,
  dependency = {
    some_lib = {path = "%{HOME}/Desktop/some_lib"}
  }
}

@Raj2032, the idea is to write the config file in Nickel instead of TOML (Cargo.ncl), where you have access to string interpolation, functions, etc. Then export it as TOML.

[Raj2032]

Ok thanks mate :) ------- Original Message -------

…

On Tuesday, June 13th, 2023 at 18:01, Yann Hamdaoui ***@***.***> wrote: I think it would be more idiomatic to simply interpolate HOME directly: { HOME | String | not_exported, dependency = { some_lib = {path = "%{HOME}/Desktop/some_lib"} } } ***@***.***(https://github.com/Raj2032), the idea is to write the config file in Nickel instead of TOML (Cargo.ncl), where you have access to string interpolation, functions, etc. Then export it as TOML. — Reply to this email directly, [view it on GitHub](#1356 (reply in thread)), or [unsubscribe](https://github.com/notifications/unsubscribe-auth/AG7P2BSQ7ESPBR57X3RLZQ3XLAM7JANCNFSM6AAAAAAZCFTL3I). You are receiving this because you were mentioned.Message ID: ***@***.***>