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/*
Copyright 2021-2023 Gabriel Jensen.
This file is part of Luma.
Luma is free software: you can redistribute it
and/or modify it under the terms of the GNU
Affero General Public License as published by
the Free Software Foundation, either version 3
of the License, or (at your option) any later
version.
Luma is distributed in the hope that it will be
useful, but WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Affero General Public License for more details.
You should have received a copy of the GNU
Affero General Public License along with Luma.
If not, see <https://www.gnu.org/licenses/>.
*/
use crate::configuration::Configuration;
extern crate toml;
use std::fs::read_to_string;
use std::str::FromStr;
use toml::{Table, Value};
impl Configuration {
pub fn load(path: &str) -> Result<Self, String> {
eprintln!("loading configuration at \"{path}\"");
let configuration_text = match read_to_string(path) {
Ok( content) => content,
_ => return Err("unable to read file".to_string()),
};
let base_table = match Table::from_str(&configuration_text) {
Ok( table) => table,
_ => return Err("unable to parse configuration".to_string()),
};
let luma_table = get_table(&base_table, "luma")?;
let device_table = get_table(&base_table, "device")?;
let video_table = get_table(&base_table, "video")?;
let version = get_integer(&luma_table, "version")?;
if version < Self::VERSION { return Err(format!("ancient version - got {}, expected {}", version, Self::VERSION)) }
if version > Self::VERSION { return Err(format!("out-of-date version - got {}, expected {}", version, Self::VERSION)) }
let bootloader = get_string(&device_table, "bootloader")?;
let image = get_string(&device_table, "image")?;
let scale = get_integer(&video_table, "scale")?;
let configuration = Configuration {
bootloader: bootloader.clone(),
image: image.clone(),
scale: scale,
};
configuration.validate()?;
return Ok(configuration);
}
}
fn get_value<'a>(table: &'a Table, name: &str) -> Option<&'a Value> {
if !table.contains_key(name) { return None };
return Some(&table[name]);
}
fn get_table<'a>(table: &'a Table, name: &str) -> Result<&'a Table, String> {
return match get_value(table, name) {
Some(Value::Table(table)) => Ok(table),
Some(_) => Err(format!("\"{name}\" should be a section")),
_ => Err("section \"{name}\" is required".to_string()),
};
}
fn get_integer(table: &Table, name: &str) -> Result<u32, String> {
return match get_value(table, name) {
Some(Value::Integer(value)) => Ok(*value as u32),
Some(_) => Err(format!("\"{name}\" should be an integer")),
_ => Err("missing integer \"{name}\"".to_string()),
};
}
fn get_string<'a>(table: &'a Table, name: &str) -> Result<&'a String, String> {
return match get_value(table, name) {
Some(Value::String(string)) => Ok(string),
Some(_) => Err(format!("\"{name}\" should be a string")),
_ => Err("missing string \"{name}\"".to_string()),
};
}
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