From 535d4fcc930a4f99aa2a90054d866fb2acb7908a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jo=C3=A3o=20M=2E=20Bezerra?= <marcospb19@hotmail.com>
Date: Sun, 4 Apr 2021 02:20:39 -0300
Subject: [PATCH] Added oof::matches_any_arg, can detect --help etc.

---
 oof/src/lib.rs | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/oof/src/lib.rs b/oof/src/lib.rs
index bff131b..2fb5122 100644
--- a/oof/src/lib.rs
+++ b/oof/src/lib.rs
@@ -212,6 +212,17 @@ pub fn filter_flags(
     Ok((new_args, result_flags))
 }
 
+/// Says if any text matches any arg
+pub fn matches_any_arg<T, U>(args: &[T], texts: &[U]) -> bool
+where
+    T: AsRef<OsStr>,
+    U: AsRef<str>,
+{
+    texts
+        .iter()
+        .any(|text| args.iter().any(|arg| arg.as_ref() == text.as_ref()))
+}
+
 #[cfg(test)]
 mod tests {
     use crate::*;
@@ -311,6 +322,28 @@ mod tests {
         // Should panic here
         filter_flags(vec![], &flags_info).unwrap_err();
     }
+
+    #[test]
+    fn test_matches_any_arg_function() {
+        let args = gen_args("program a -h b");
+        assert!(matches_any_arg(&args, &["--help", "-h"]));
+
+        let args = gen_args("program a b --help");
+        assert!(matches_any_arg(&args, &["--help", "-h"]));
+
+        let args = gen_args("--version program a b");
+        assert!(matches_any_arg(&args, &["--version", "-v"]));
+
+        let args = gen_args("program -v a --version b");
+        assert!(matches_any_arg(&args, &["--version", "-v"]));
+
+        // Cases without it
+        let args = gen_args("program a b c");
+        assert!(!matches_any_arg(&args, &["--help", "-h"]));
+
+        let args = gen_args("program a --version -v b c");
+        assert!(!matches_any_arg(&args, &["--help", "-h"]));
+    }
 }
 
 /// Create a flag with long flag (?).