move to clap 4, wip4, replay almost working

cargo-klee/src/cargo_out.rs

+// Commodity functions to parse the output of `cargo`.
+// Notice, this is fragile and depends on the output format of `cargo` which has no stability guarantees.
+use regex::Regex;
+
+pub fn get_hash(s: &str) -> Option<String> {
+    let re = Regex::new(r"(-C metadata=)([\da-f]*)").unwrap();
+    let cap = re.captures(s)?;
+    Some(cap[2].to_string())
+}
+
+pub fn get_out_dir(s: &str) -> Option<String> {
+    let re = Regex::new(r"(--out-dir)( )([[:alpha:]\d/-]*)").unwrap();
+    let cap = re.captures(s)?;
+    Some(cap[3].to_string())
+}
+
+#[test]
+fn test_hash() {
+    let s = "-C linker=true -C lto --emit=llvm-ir -C metadata=71aaac8ea4e4b0e4 extra-filename=-71aaac8ea4e4b0e4 -C metadata=71e4";
+
+    let hash = get_hash(s);
+
+    println!("hash {:?}", hash);
+    assert_eq!(hash.unwrap(), "71aaac8ea4e4b0e4");
+}
+
+#[test]
+fn test_out_dir_bin() {
+    let s = "-C extra-filename=-6539d757805e64cf --out-dir /home/pln/courses/d7020e/cargo-klee/klee-examples/target/debug/examples -L dependency=/home/pln/courses/d7020e/cargo-klee/klee-examples/target/debug/deps";
+
+    let dir = get_out_dir(s);
+    println!("dir {:?}", dir);
+
+    assert_eq!(
+        dir.unwrap(),
+        "/home/pln/courses/d7020e/cargo-klee/klee-examples/target/debug/examples"
+    );
+}