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|
use ahash::HashMap;
use clap::{error::Error as ClapError, ArgMatches, CommandFactory};
use config::{Config, ConfigError};
use toml::Value;
#[derive(Debug, thiserror::Error)]
pub enum Error {
#[error("{0}")]
Deserialization(#[from] ConfigError),
#[error("Table '#{0}' does not exist.")]
TableNotFound(String),
#[error("Error while parsing config arguments: {0}")]
Parse(#[from] ClapError),
}
type Result<T> = std::result::Result<T, Error>;
type KeyTransformer = fn(String) -> String;
type TomlConfig = toml::map::Map<String, Value>;
pub fn args(conf: Config, table_name: Option<&str>) -> Result<Option<ArgMatches>> {
let maybe_config = conf.try_deserialize::<toml::Table>().map(|raw_config| {
deep_transform_keys(raw_config, |mut key| {
key.make_ascii_lowercase();
format!("--{}", key.replace('_', "-"))
})
})?;
let Some(mut config) = maybe_config else {
return Ok(None);
};
match table_name {
Some(name) => match config.remove(&format!("--{name}")) {
Some(Value::Table(sub_table)) => {
config = sub_table;
},
_ => return Err(Error::TableNotFound(name.to_string())),
},
None => remove_sub_tables(&mut config),
}
let arg_matches = into_args(config)?;
Ok(Some(arg_matches))
}
fn into_args(conf: TomlConfig) -> Result<ArgMatches> {
let mut args = vec![crate::BIN_NAME.to_string()];
for (arg_name, param) in conf {
match param {
Value::Array(array_args) => {
for arg in array_args {
if let Some(farg) = fmt_arg(arg) {
args.push(arg_name.clone());
args.push(farg)
}
}
},
Value::Boolean(arg) if arg => {
args.push(arg_name.clone());
},
_ => {
if let Some(farg) = fmt_arg(param) {
args.push(arg_name.clone());
args.push(farg)
}
},
}
}
let cmd = crate::user::Context::command().try_get_matches_from(args)?;
Ok(cmd)
}
/// Formats basic primitive types into OS args. Will ignore table and array types.
fn fmt_arg(val: Value) -> Option<String> {
match val {
Value::Float(p) => Some(p.to_string()),
Value::String(p) => Some(p.to_string()),
Value::Datetime(p) => Some(p.to_string()),
Value::Integer(p) => Some(p.to_string()),
_ => None,
}
}
fn remove_sub_tables(conf: &mut TomlConfig) {
let mut sub_table_keys = Vec::new();
conf.iter().for_each(|(k, v)| {
if let Value::Table(_) = v {
sub_table_keys.push(k.clone())
}
});
sub_table_keys.iter().for_each(|k| {
conf.remove(k);
});
}
/// Transforms all keys and nested keys to the format computed by `transformer`.
fn deep_transform_keys(toml: TomlConfig, transformer: KeyTransformer) -> Option<TomlConfig> {
let mut dfs_stack_src = vec![Value::Table(toml)];
let mut dfs_stack_dst = vec![("".to_string(), toml::map::Map::default())];
let mut key_iters = HashMap::default();
'outer: while !dfs_stack_src.is_empty() {
let Some(Value::Table(current_node)) = dfs_stack_src.last_mut() else {
continue;
};
let Some((dst_key, copy_dst)) = dfs_stack_dst.last_mut() else {
continue;
};
let keys = key_iters
.entry(dst_key.clone())
.or_insert_with(|| current_node.keys().cloned().collect::<Vec<_>>().into_iter());
for key in keys {
match current_node.remove(&key) {
Some(value) => match value {
Value::Table(_) => {
let transformed_key = transformer(key);
dfs_stack_dst.push((transformed_key, toml::map::Map::default()));
dfs_stack_src.push(value);
continue 'outer;
},
_ => {
let transformed_key = transformer(key);
copy_dst.insert(transformed_key, value);
},
},
None => continue,
}
}
dfs_stack_src.pop();
if let Some((transformed_key, current_map)) = dfs_stack_dst.pop() {
if let Some((_, parent_map)) = dfs_stack_dst.last_mut() {
parent_map.insert(transformed_key, Value::Table(current_map));
} else {
return Some(current_map);
}
}
}
None
}
|
