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// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
use std::{
ffi::{OsStr, OsString},
path::Path,
vec,
};
use anyhow::Result;
use nimbus_fml::command_line::do_main;
pub(crate) fn fml_cli(args: &Vec<OsString>, cwd: &Path) -> Result<bool> {
// We prepend the string `nimbus-cli fml` to the args to pass to FML
// because the clap uses the 0th argument for help messages; so the FML's command line processor
// will report an error with a usage message of `nimbus-cli fml generate [FLAGS] INPUT OUTPUT`.
let first = OsStr::new("nimbus-cli fml").to_os_string();
let mut cli_args = vec![&first];
let help = OsStr::new("--help").to_os_string();
if args.is_empty() {
// If the user has just typed `nimbus-cli fml`– with no further arguments— then the rather unhelpful message
// `not implemented: Command not implemented` is displayed. This will change if and when we upgrade the nimbus-fml
// to use cli-derive, but until then, we can do a simple thing to make the experience a bit nicer, by adding
// the `--help` flag, so the user gets the nimbus-fml command line help.
cli_args.push(&help);
}
// Finally, send all the args after `nimbus-cli fml` verbatim to the FML clap cli.
cli_args.extend(args);
do_main(cli_args, cwd)?;
Ok(true)
}