config file from arg or default location

2 files changed, 45 insertions, 2 deletions

diff --git a/src/config.rs b/src/config.rs
new file mode 100644
index 0000000..518a82a
--- /dev/null
+++ b/src/config.rs
@@ -0,0 +1,30 @@
+use std::{fs::File, io::{Read, read_to_string}, path::Path};
+
+use serde::Deserialize;
+
+#[derive(Deserialize)]
+pub struct Config {
+}
+
+pub const DEFAULT_CONFIG_FILE_LOCATIONS: [&str; 1] = [
+    "/etc/rss-aggregator.toml",
+];
+
+impl Config {
+    pub fn parse_config_file_at_path(path: &str) -> anyhow::Result<Config> {
+        let path = Path::new(path);
+        let file = File::open(&path)?;
+        let contents = read_to_string(file)?;
+        Ok(toml::from_str(&contents)?)
+    }
+
+    pub fn find_config() -> Option<Config> {
+        for path in DEFAULT_CONFIG_FILE_LOCATIONS {
+            match Self::parse_config_file_at_path(path) {
+                Ok(config) => { return Some(config); },
+                Err(_) => {},
+            };
+        };
+        None
+    }
+}
diff --git a/src/main.rs b/src/main.rs
index 705b33b..b445285 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,11 +1,24 @@
+mod config;
+
 use clap::Parser;
 
+use crate::config::Config;
+
 #[derive(Parser, Debug)]
 #[command(version, about, long_about = None)]
 struct Args {
+    /// Path to the config file. If blank, searches default config locations.
+    #[arg(short = 'c', long = "config", default_value = "")]
+    config_file: String,
 }
 
 fn main() {
-    let _args = Args::parse();
-    println!("Hello, world!");
+    let args = Args::parse();
+    let _config = match args.config_file.as_str() {
+        "" => Config::find_config().unwrap_or_else(||
+            panic!("Failed to find config. Paths searched: {:#?}", config::DEFAULT_CONFIG_FILE_LOCATIONS)),
+        path => Config::parse_config_file_at_path(&path).unwrap_or_else(|err|
+            panic!("Failed to parse config at {}. Error: {}", path, err)),
+    };
+    println!("Found config file.");
 }