feat untildify

.gitignore

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+/target
+Cargo.lock
+.DS_Store

Cargo.toml

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+[package]
+name = "untildify"
+version = "0.1.0"
+edition = "2018"
+license = "MIT"
+readme = "README.md"
+authors = ["sathishsoundharajan <sathishwelcomez@ymail.com>"]
+categories = ["development-tools"]
+homepage = "https://github.com/sathishsoundharajan/untildify"
+repository = "https://github.com/sathishsoundharajan/untildify"
+keywords = ["tilde", "untildify", "~", "utility"]
+documentation = "https://docs.rs/untildify"
+
+[badges.maintenance]
+status = "actively-developed"
+
+[dependencies]
+regex = "1.5.4"

src/lib.rs

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+use regex::Regex;
+use std::env;
+use std::path::PathBuf;
+
+pub fn untildify(input_path: &str) -> String {
+    if input_path.is_empty() {
+        return String::from(input_path);
+    }
+    return match get_host_dir() {
+        Some(path) => {
+            let host_dir = path.to_str().unwrap();
+            let re = Regex::new(r"^~([/\w]+)").unwrap();
+            match re.captures(input_path) {
+                Some(captures) => {
+                    return format!("{}{}", host_dir, &captures[1]);
+                }
+                None => String::from(input_path),
+            }
+        }
+        None => String::from(input_path),
+    };
+}
+
+#[cfg(any(unix, target_os = "redox"))]
+fn get_host_dir() -> Option<PathBuf> {
+    #[allow(deprecated)]
+    env::home_dir()
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::untildify;
+    use std::env;
+    use std::path::Path;
+
+    #[test]
+    fn test_returns_untildfyed_string() {
+        env::remove_var("HOME");
+
+        let home = Path::new("/User/Untildify");
+        env::set_var("HOME", home.as_os_str());
+
+        assert_eq!(untildify("~/Desktop"), "/User/Untildify/Desktop");
+        assert_eq!(untildify("~/a/b/c/d/e"), "/User/Untildify/a/b/c/d/e");
+        assert_eq!(untildify("~/"), "/User/Untildify/");
+    }
+
+    #[test]
+    fn test_returns_empty_string() {
+        env::remove_var("HOME");
+
+        let home = Path::new("/User/Untildify");
+        env::set_var("HOME", home.as_os_str());
+
+        assert_eq!(untildify("Desktop"), "Desktop");
+        assert_eq!(untildify(""), "");
+        assert_eq!(untildify("/"), "/");
+        assert_eq!(untildify("~/Desktop/~/Code"), "/User/Untildify/Desktop/");
+    }
+}