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// SPDX-License-Identifier: MIT OR Apache-2.0
//! 2026-09-26: The `met serve` flags the Config form can add or pick, read from clap's `ServeArgs` at runtime.
//!
//! Enumerated value sets come from `cli::flag_values::options_for_flag`, the
//! module whose lists `validate_serve_args` also checks against.
//!
//! Owner: server tui.
//! Invariants:
//! - [`serve_fields`] holds one entry per long flag of `ServeArgs`, minus
//! `Append`/`Count` flags and help/version actions.
use std::sync::OnceLock;
use clap::{ArgAction, CommandFactory as _};
/// 2026-09-26: One addable `met serve` flag, shaped for the form.
#[derive(Clone, Debug)]
pub struct FieldSpec {
/// 2026-09-26: The `defaults:` key: the long name with `-` replaced by `_`.
pub key: String,
/// 2026-09-26: clap's long name.
pub flag: String,
/// 2026-09-26: First line of the clap help, for the add-list row.
pub help: String,
/// 2026-09-26: The long clap help (else the short one), for the picker's side panel.
pub help_full: String,
/// 2026-09-26: clap's first default value; `None` makes the add flow ask for a value.
pub default: Option<String>,
/// 2026-09-26: The closed value set, empty for free-form flags.
///
/// `true`/`false` for a flag with clap's bool value parser, else
/// `cli::flag_values::options_for_flag`.
pub options: Vec<String>,
}
/// 2026-09-26: Every `met serve` flag the form can carry, built once per process.
///
/// Excluded: arguments without a long name (the positional model), and
/// `Append`/`Count` flags, since a `defaults:` map holds one value per key.
pub fn serve_fields() -> &'static [FieldSpec] {
static FIELDS: OnceLock<Vec<FieldSpec>> = OnceLock::new();
FIELDS.get_or_init(build)
}
/// 2026-09-26: The spec for a form row's key, matched through `schema::flag_for`.
///
/// So `max_model_len` and `host` find the `--max-seq-len` and `--bind` specs.
pub fn spec_for_key(key: &str) -> Option<&'static FieldSpec> {
let flag = crate::recipe::schema::flag_for(key)?;
serve_fields().iter().find(|s| s.flag == flag)
}
fn build() -> Vec<FieldSpec> {
let bool_parser_id = clap::builder::ValueParser::bool().type_id();
let command = crate::cli::ServeArgs::command();
command
.get_arguments()
.filter_map(|arg| {
let long = arg.get_long()?;
match arg.get_action() {
ArgAction::Append | ArgAction::Count => return None,
ArgAction::Help
| ArgAction::HelpShort
| ArgAction::HelpLong
| ArgAction::Version => return None,
_ => {}
}
let is_bool = arg.get_value_parser().type_id() == bool_parser_id;
let options = if is_bool {
// 2026-09-26: `recipe::schema::argv_for` renders `true` on a presence-only flag as the bare
// flag and drops `false`; other flags keep the value.
vec!["true".to_string(), "false".to_string()]
} else {
crate::cli::flag_values::options_for_flag(long).unwrap_or_default()
};
let help_full = arg
.get_long_help()
.or_else(|| arg.get_help())
.map(|h| h.to_string())
.unwrap_or_default();
Some(FieldSpec {
key: long.replace('-', "_"),
flag: long.to_string(),
help: arg
.get_help()
.map(|h| h.to_string().lines().next().unwrap_or("").to_string())
.unwrap_or_default(),
help_full,
default: arg
.get_default_values()
.first()
.map(|v| v.to_string_lossy().into_owned()),
options,
})
})
.collect()
}
#[cfg(test)]
#[path = "lib_fields_tests.rs"]
mod tests;