first version

.gitignore

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+/target
+.idea/

Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "prettypwd"
+version = "0.1.0"

Cargo.toml

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+[package]
+name = "prettypwd"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+
+[profile.release]
+lto = true
+# strip = "symbols"

src/main.rs

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+extern crate core;
+
+use std::env;
+
+
+fn simplify_string(pwd: String, home: String) -> String {
+    let prettyhome = pwd.replacen(home.as_str(), "/~", 1);
+    let dirs: Vec<&str> = prettyhome.split("/").collect();
+    let mut print_dirs: Vec<&str> = Vec::new();
+    if dirs.len() > 4 {
+        if dirs[1] != "~" {
+            print_dirs.push("")
+        }
+        print_dirs.push(dirs[1]);
+        print_dirs.push("…");
+        print_dirs.extend(dirs[dirs.len() - 2..].to_vec())
+    } else { print_dirs = dirs }
+    // println!("{:#?}", print_dirs);
+    return print_dirs.join("/").replacen("/~", "~", 1);
+}
+
+fn main() {
+    let pwd = env::var("PWD");
+    let pwd = match pwd {
+        Ok(test) => test,
+        Err(error) => panic!("{:?}", error)
+    };
+    let home = env::var("HOME");
+    let home = match home {
+        Ok(test) => test,
+        Err(error) => panic!("{:?}", error)
+    };
+    println!("{}", simplify_string(pwd, home));
+}
+
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    const TEST_HOME: &str = "/home/user";
+
+    fn comparison_helper(input: &str, output: &str) {
+        assert_eq!(
+            simplify_string(input.to_string(), TEST_HOME.to_string())
+            , output.to_string()
+        );
+    }
+
+    #[test]
+    fn it_works() {
+        comparison_helper("/test", "/test");
+    }
+
+    #[test]
+    fn shortening() {
+        comparison_helper("/var/log/sometool", "/var/log/sometool");
+        comparison_helper("/var/log/sometool/subdir", "/var/…/sometool/subdir");
+    }
+
+    #[test]
+    fn homedir() {
+        comparison_helper("/home/user/sometool/subdir", "~/sometool/subdir");
+        comparison_helper("/home/user/sometool/subdir/subsubdir", "~/…/subdir/subsubdir");
+    }
+}