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extern crate colored;
extern crate serde;
extern crate serde_derive;
use colored::*;
use std::collections::BTreeMap as Map;
use error::Error;
#[derive(Deserialize, Serialize, Default)]
pub struct Config {
pythons: Map<String, String>,
}
pub struct ConfigHandler {
cfg_path: std::path::PathBuf,
}
impl ConfigHandler {
pub fn new(cfg_path: Option<String>) -> Result<Self, Error> {
let cfg_path = Self::get_config_path(cfg_path)?;
return Ok(ConfigHandler { cfg_path });
}
pub fn get_python(&self, version: &str) -> Result<String, Error> {
self.check_cfg_path()?;
let config = Self::parse_config(&self.cfg_path)?;
let matching_python = &config.pythons.get(version);
if matching_python.is_none() {
return Err(Error::new(&format!(
"No python found matching version: {}",
version
)));
}
let matching_python = matching_python.unwrap();
Ok(matching_python.clone())
}
pub fn add_python(&self, version: &str, path: &str) -> Result<(), Error> {
let mut config = if self.cfg_path.exists() {
Self::parse_config(&self.cfg_path)?
} else {
Config::default()
};
config.pythons.insert(version.to_string(), path.to_string());
self.write_config(config)
}
pub fn remove_python(&self, version: &str) -> Result<(), Error> {
self.check_cfg_path()?;
let mut config = Self::parse_config(&self.cfg_path)?;
config.pythons.remove(version);
self.write_config(config)
}
pub fn list_pythons(&self) -> Result<(), Error> {
self.check_cfg_path()?;
let config = Self::parse_config(&self.cfg_path)?;
for (version, path) in &config.pythons {
println!("{}: {}", version.bold(), path);
}
Ok(())
}
fn check_cfg_path(&self) -> Result<(), Error> {
if !&self.cfg_path.exists() {
let message = format!(
"{}\n{}",
"No pythons configured yet",
"Please run `dmenv pythons add default <path/to/python3/interpreter>`"
);
return Err(Error::new(&message));
}
Ok(())
}
fn get_config_path(cfg_path: Option<String>) -> Result<std::path::PathBuf, Error> {
if cfg_path.is_some() {
return Ok(cfg_path.unwrap().into());
}
let config_dir = appdirs::user_config_dir(Some("dmenv"), Some("dmenv"), false);
if config_dir.is_err() {
return Err(Error::new(
"appdirs::user_data_dir() failed. That's all we know",
));
}
let config_dir = config_dir.unwrap();
let res = config_dir.join("dmenv.toml");
println!("Using config from {}", res.to_string_lossy());
Ok(res)
}
fn write_config(&self, config: Config) -> Result<(), Error> {
let contents = toml::to_string(&config)?;
let parent = self.cfg_path.parent().expect("cfg_path has no parent");
std::fs::create_dir_all(&parent)?;
std::fs::write(&self.cfg_path, &contents)?;
Ok(())
}
fn parse_config(cfg_path: &std::path::PathBuf) -> Result<Config, Error> {
let config_str = std::fs::read_to_string(&cfg_path);
if let Err(error) = config_str {
return Err(Error::new(&format!(
"Could not read from {}: {}",
cfg_path.to_string_lossy(),
error
)));
}
let config_str = config_str.unwrap();
let config = toml::from_str(&config_str)?;
Ok(config)
}
}
#[cfg(test)]
mod tests {
use super::*;
fn new_config_handler(tmp_dir: &tempdir::TempDir, contents: Option<&str>) -> ConfigHandler {
let cfg_path = tmp_dir.path().join("dmenv.cfg");
if let Some(contents) = contents {
std::fs::write(&cfg_path, contents).expect("");
}
let cfg_path = cfg_path.to_string_lossy();
ConfigHandler::new(Some(cfg_path.to_string())).unwrap()
}
#[test]
fn test_read_pythons() {
let tmp_dir = tempdir::TempDir::new("test-dmenv").expect("");
let config = r#"
[pythons]
default = "/usr/bin/python3"
"3.8" = "/path/to/python3.8"
"#;
let config_handler = new_config_handler(&tmp_dir, Some(config));
let actual = config_handler.get_python("3.8").unwrap();
assert_eq!(actual, "/path/to/python3.8");
let actual = config_handler.get_python("nosuch");
assert!(actual.is_err())
}
#[test]
fn test_remove_python() {
let tmp_dir = tempdir::TempDir::new("test-dmenv").expect("");
let config = r#"
[pythons]
default = "/usr/bin/python3"
"2.7" = "/usr/bin/python2"
"#;
let config_handler = new_config_handler(&tmp_dir, Some(config));
config_handler.remove_python("2.7").expect("");
let err = config_handler.get_python("2.7").unwrap_err();
assert_eq!(err.to_string(), "No python found matching version: 2.7");
}
#[test]
fn test_write_pythons() {
let tmp_dir = tempdir::TempDir::new("test-dmenv").expect("");
let config_handler = new_config_handler(&tmp_dir, None);
config_handler
.add_python("default", "/usr/bin/python3")
.expect("");
assert_eq!(
config_handler.get_python("default").expect(""),
"/usr/bin/python3"
);
}
}