refactor

src/path.rs

@@ -0,0 +1,35 @@
+use std::{env, path::PathBuf};
+
+use anyhow::{Context, Result};
+
+pub(crate) fn get_pacdef_group_dir() -> Result<PathBuf> {
+    let mut result = get_pacdef_base_dir().context("getting pacdef base dir")?;
+    result.push("groups");
+    Ok(result)
+}
+
+pub(crate) fn get_pacdef_config_file() -> Result<PathBuf> {
+    let mut result = get_pacdef_base_dir().context("getting pacdef base dir")?;
+    result.push("pacdef.conf");
+    Ok(result)
+}
+
+fn get_pacdef_base_dir() -> Result<PathBuf> {
+    let mut dir = get_xdg_config_home().context("getting XDG_CONFIG_HOME")?;
+    dir.push("pacdef");
+    Ok(dir)
+}
+
+fn get_xdg_config_home() -> Result<PathBuf> {
+    if let Ok(config) = env::var("XDG_CONFIG_HOME") {
+        Ok(config.into())
+    } else {
+        let mut config = get_home_dir().context("falling back to $HOME/.config")?;
+        config.push(".config");
+        Ok(config)
+    }
+}
+
+fn get_home_dir() -> Result<PathBuf> {
+    Ok(env::var("HOME").context("getting $HOME variable")?.into())
+}