add basic application config and parser

peach-web/config

@@ -0,0 +1,2 @@
+disable_auth=false
+standalone_mode=true

peach-web/src/config.rs

@@ -0,0 +1,54 @@
+// Kind thanks to Alex Wennerberg (https://alexwennerberg.com/) for writing
+// this code and offered it under the 0BSD (BDS 0-Clause) license.
+
+use std::fs::File;
+use std::io::{self, BufRead};
+use std::path::Path;
+
+// Ini-like key=value configuration with global config only (no subsections).
+#[derive(Debug)]
+pub struct Config {
+    pub disable_auth: bool,
+    pub standalone_mode: bool,
+}
+
+impl Default for Config {
+    fn default() -> Self {
+        Self {
+            disable_auth: false,
+            standalone_mode: true,
+        }
+    }
+}
+
+impl Config {
+    pub fn match_kv(&mut self, key: &str, value: &str) {
+        match key {
+            "disable_auth" => self.disable_auth = value.parse().unwrap(),
+            "standalone_mode" => self.standalone_mode = value.parse().unwrap(),
+            _ => {}
+        }
+    }
+}
+
+impl Config {
+    pub fn from_file<P: AsRef<Path>>(path: P) -> Result<Config, std::io::Error> {
+        let file = File::open(path)?;
+        let mut conf = Config::default();
+
+        for l in io::BufReader::new(file).lines() {
+            let line = l?;
+            if line.len() == 0 {
+                continue;
+            }
+            if let Some(i) = line.find('=') {
+                let key = &line[..i];
+                let value = &line[i + 1..];
+                conf.match_kv(key, value);
+            } else {
+                // panic!("Invalid config")
+            }
+        }
+        Ok(conf)
+    }
+}