From e6677c306126cdb865d4fd513224d79c74e561ef Mon Sep 17 00:00:00 2001
From: Ferdinand Schober <ferdinandschober20@gmail.com>
Date: Fri, 1 Dec 2023 11:16:56 +0100
Subject: [PATCH] Respect XDG_CONFIG_HOME for config.toml location (#41)

* Respect XDG_CONFIG_HOME for config.toml location
* add option to specify config via commandline

closes #39
---
 src/config.rs | 22 +++++++++++++++++++---
 1 file changed, 19 insertions(+), 3 deletions(-)

diff --git a/src/config.rs b/src/config.rs
index ea131cc..aac8283 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -44,6 +44,7 @@ impl Error for MissingParameter {}
 impl ConfigToml {
     pub fn new(path: &str) -> Result<ConfigToml, Box<dyn Error>> {
         let config = fs::read_to_string(path)?;
+        log::info!("using config: \"{path}\"");
         Ok(toml::from_str::<_>(&config)?)
     }
 }
@@ -77,10 +78,25 @@ pub struct Config {
 
 impl Config {
     pub fn new() -> Result<Self, Box<dyn Error>> {
-        let config_path = "config.toml";
-        let config_toml = match ConfigToml::new(config_path) {
+        let config_file = "config.toml";
+        #[cfg(unix)] let config_path = {
+            let xdg_config_home = env::var("XDG_CONFIG_HOME")
+                .unwrap_or(format!("{}/.config", env::var("HOME")?));
+            format!("{xdg_config_home}/lan-mouse/{config_file}")
+        };
+
+        #[cfg(not(unix))] let config_path = {
+            let app_data = env::var("LOCALAPPDATA")
+                .unwrap_or(format!("{}/.config", env::var("USERPROFILE")?));
+            format!("{app_data}\\lan-mouse\\{config_file}")
+        };
+
+        // --config <file> overrules default location
+        let config_path = find_arg("--config")?.unwrap_or(config_path);
+
+        let config_toml = match ConfigToml::new(config_path.as_str()) {
             Err(e) => {
-                log::error!("config.toml: {e}");
+                log::error!("{config_path}: {e}");
                 log::warn!("Continuing without config file ...");
                 None
             },