From e2b258ca09093a50b90b8345e9a9b2b11d16e909 Mon Sep 17 00:00:00 2001
From: Hatter Jiang <jht5945@gmail.com>
Date: Sun, 24 Aug 2025 16:11:03 +0800
Subject: [PATCH] feat: add env_var

---
 Cargo.toml      |  2 +-
 src/util_env.rs | 12 ++++++++++++
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/Cargo.toml b/Cargo.toml
index 2705d54..7e8d0b0 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "rust_util"
-version = "0.6.48"
+version = "0.6.49"
 authors = ["Hatter Jiang <jht5945@gmail.com>"]
 edition = "2018"
 description = "Hatter's Rust Util"
diff --git a/src/util_env.rs b/src/util_env.rs
index 0599013..c90ec36 100644
--- a/src/util_env.rs
+++ b/src/util_env.rs
@@ -17,3 +17,15 @@ pub fn is_off(val: &str) -> bool {
     let lower_val = val.to_lowercase();
     ["false", "no", "0"].iter().any(|x| *x == lower_val)
 }
+
+pub fn env_var(var: &str) -> Option<String> {
+    let var_from_env = env::var(var).ok();
+    if var_from_env.is_some() {
+        return var_from_env;
+    }
+    let var_content = crate::util_file::read_file_content(&format!("~/.config/envs/{}", var));
+    if let Ok(var_content) = var_content {
+        return Some(var_content.trim().to_string());
+    }
+    None
+}