139 lines
4.1 KiB
Rust
139 lines
4.1 KiB
Rust
//! # Config settings definitions
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//! To load config values from TOML file path, it can be provided via command-line arguments <br>
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//! It use [serde](https://serde.rs/) via [`load_from_file`]
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//
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use serde::de::DeserializeOwned;
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use serde::{Deserialize, Serialize}; // ,Deserializer,Serializer};
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use std::io::{Error, ErrorKind, Result};
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use crate::{defs::CliSettings, CFG_FILE_EXTENSION, DEFAULT_INPUT_PATH, DEFAULT_REG_EXP};
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fn default_config_input() -> String {
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String::from("input.txt")
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}
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fn default_config_output() -> String {
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String::from("")
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}
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fn default_config_overwrite() -> bool {
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true
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}
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fn default_config_be_quiet() -> bool {
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false
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}
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fn default_config_reg_exp() -> String {
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String::from(DEFAULT_REG_EXP)
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}
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fn default_config_targets() -> Vec<ConfigTarget> {
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vec![ConfigTarget::default()]
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}
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/// Settings for each target metric defined in **config path**
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/// **config.toml** content example:
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/// ```toml
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/// be_quiet = false
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/// [[targets]]
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/// input = "input.txt"
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///
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/// [[targets]]
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/// input = "input_2.txt"
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/// ```
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#[derive(Debug, Clone, Serialize, Deserialize)]
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pub struct ConfigTarget {
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#[serde(default = "default_config_input")]
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pub input: String,
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#[serde(default = "default_config_output")]
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pub output: String,
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#[serde(default = "default_config_overwrite")]
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pub out_overwrite: bool,
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#[serde(default = "default_config_reg_exp")]
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pub reg_exp: String,
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}
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impl Default for ConfigTarget {
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fn default() -> Self {
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Self {
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input: String::from(DEFAULT_INPUT_PATH),
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output: String::from(""),
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out_overwrite: true,
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reg_exp: String::from(DEFAULT_REG_EXP),
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}
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}
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}
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/// Config Settings with target metric settings [`ConfigTarget`]
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/// **config.toml** content example:
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/// ```toml
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/// be_quiet = false
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/// [[targets]]
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/// input = "input.txt"
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///
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/// [[targets]]
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/// input = "input_2.txt"
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/// ```
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#[derive(Debug, Clone, Serialize, Deserialize)]
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pub struct Config {
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#[serde(default = "default_config_be_quiet")]
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pub be_quiet: bool,
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#[serde(default = "default_config_targets")]
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pub targets: Vec<ConfigTarget>,
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}
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impl Default for Config {
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fn default() -> Self {
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Self {
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be_quiet: false,
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targets: vec![ConfigTarget::default()],
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}
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}
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}
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impl Config {
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// To override [`Config`] values with [`CliSettings`] provided via command line arguments and loaded via [`parse_args`]
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pub fn add_cli_settings(&self, cli_settings: CliSettings) -> Self {
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let be_quiet = if let Some(be_quiet) = cli_settings.be_quiet {
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be_quiet
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} else {
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self.be_quiet
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};
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let targets = if let Some(input) = cli_settings.input {
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let mut target = ConfigTarget {
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input,
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..Default::default()
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};
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if let Some(output) = cli_settings.output {
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target.output = output
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}
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vec![target]
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} else {
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self.targets.to_owned()
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};
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Self { be_quiet, targets }
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}
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}
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/// To load config settings and **Deserialize** content to [`Config`] struct <br>
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/// It use **T** as generic, allowing to load from a file to a **T** type
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/// It use **fs::read_to_string** as it is expecting short files size, no need to buffers.
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pub fn load_from_file<T: DeserializeOwned>(file_cfg: &str) -> Result<T> {
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let file_path = if file_cfg.contains(CFG_FILE_EXTENSION) {
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file_cfg.to_string()
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} else {
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format!("{}{}", file_cfg, CFG_FILE_EXTENSION)
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};
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let config_content = match std::fs::read_to_string(&file_path) {
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Ok(cfgcontent) => cfgcontent,
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Err(e) => {
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return Err(Error::new(
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ErrorKind::InvalidInput,
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format!("Error read {}: {}", &file_path, e),
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))
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}
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};
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let item_cfg = match toml::from_str::<T>(&config_content) {
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Ok(cfg) => cfg,
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Err(e) => {
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return Err(Error::new(
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ErrorKind::InvalidInput,
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format!("Error loading config {}: {}", &file_path, e),
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))
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}
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};
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Ok(item_cfg)
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}
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