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use anyhow::Result;
use platform_dirs::AppDirs;
pub use platform_dirs::AppUI;
use serde::{Deserialize, Serialize};
use std::fs::OpenOptions;
use std::io::BufReader;
use std::path::PathBuf;
pub struct Configstore {
prefix_dir: PathBuf,
}
const CONFIG_STORE_NAME: &str = "configstore-rs";
impl Configstore {
pub fn new(app_name: &str, app_ui: AppUI) -> Result<Self> {
let prefix_dir = match AppDirs::new(Some(CONFIG_STORE_NAME), app_ui) {
Some(dir) => dir.config_dir,
None => return Err(anyhow::Error::msg("Unable to find config directory")),
};
let prefix_dir = prefix_dir.join(app_name);
std::fs::create_dir_all(prefix_dir.clone())?;
Ok(Configstore { prefix_dir })
}
pub fn set<T>(&self, key: &str, value: T) -> Result<()>
where
T: Serialize + for<'de> Deserialize<'de>,
{
let mut file_name = String::from(key);
file_name.push_str(".json");
let config_path = self.prefix_dir.join(&file_name);
let file = OpenOptions::new()
.write(true)
.create(true)
.truncate(true)
.open(config_path)?;
serde_json::to_writer(&file, &value)?;
Ok(())
}
pub fn get<T>(&self, key: &str) -> Result<T>
where
T: Serialize + for<'de> Deserialize<'de>,
{
let mut file_name = String::from(key);
file_name.push_str(".json");
let config_path = self.prefix_dir.join(&file_name);
let file = std::fs::File::open(config_path)?;
let buff_reader = BufReader::new(file);
let ret: T = serde_json::from_reader(buff_reader)?;
Ok(ret)
}
}
#[cfg(test)]
mod tests {
use super::*;
use serde_derive::*;
#[derive(Deserialize, Serialize, Eq, PartialEq, Debug, Clone)]
struct TestStruct {
str_test: String,
num: i64,
}
#[test]
fn test_struct() {
let config_store = Configstore::new("tests", AppUI::CommandLine).unwrap();
let test_struct = TestStruct {
str_test: "Hello World".to_string(),
num: 1000,
};
config_store.set("test1", test_struct.clone()).unwrap();
let other_struct: TestStruct = config_store.get("test1").unwrap();
assert_eq!(test_struct, other_struct);
}
#[test]
fn test_string() {
let config_store = Configstore::new("tests", AppUI::CommandLine).unwrap();
config_store.set("test2", String::from("World")).unwrap();
let out: String = config_store.get("test2").unwrap();
assert_eq!(out, "World".to_string());
}
#[test]
fn reset_same_type() {
let config_store = Configstore::new("tests", AppUI::CommandLine).unwrap();
let test_struct = TestStruct {
str_test: "Hello World".to_string(),
num: 1000,
};
config_store.set("test3", test_struct.clone()).unwrap();
let other_struct: TestStruct = config_store.get("test3").unwrap();
assert_eq!(test_struct, other_struct);
let replacement_struct = TestStruct {
str_test: "Goodbye World".to_string(),
num: 4242,
};
config_store
.set("test3", replacement_struct.clone())
.unwrap();
let out: TestStruct = config_store.get("test3").unwrap();
assert_eq!(replacement_struct, out);
}
#[test]
fn test_vector() {
let config_store = Configstore::new("tests", AppUI::CommandLine).unwrap();
let test_struct_1 = TestStruct {
str_test: "Hello World".to_string(),
num: 1000,
};
let test_struct_2 = TestStruct {
str_test: "Goodbye world".to_string(),
num: 4524,
};
let test_vec = vec![test_struct_1, test_struct_2];
config_store.set("test4", test_vec.clone()).unwrap();
let out: Vec<TestStruct> = config_store.get("test4").unwrap();
assert_eq!(out.len(), test_vec.len());
for (i, val) in out.iter().enumerate() {
assert_eq!(test_vec[i], *val);
}
}
}