1 files changed, 57 insertions, 0 deletions
diff --git a/2.27.1/src/strx.rs b/2.27.1/src/strx.rs
new file mode 100644
index 0000000..d1b26fa
--- /dev/null
+++ b/2.27.1/src/strx.rs
@@ -0,0 +1,57 @@
+pub fn remove_to<'s, P>(s: &'s str, pattern: P) -> &'s str
+where
+    P: Fn(char) -> bool,
+{
+    match s.rfind(pattern) {
+        Some(pos) => &s[(pos + 1)..],
+        None => s,
+    }
+}
+
+pub fn remove_suffix<'s>(s: &'s str, suffix: &str) -> &'s str {
+    if !s.ends_with(suffix) {
+        s
+    } else {
+        &s[..(s.len() - suffix.len())]
+    }
+}
+
+pub fn capitalize(s: &str) -> String {
+    if s.is_empty() {
+        return String::new();
+    }
+    let mut char_indices = s.char_indices();
+    char_indices.next().unwrap();
+    match char_indices.next() {
+        None => s.to_uppercase(),
+        Some((i, _)) => s[..i].to_uppercase() + &s[i..],
+    }
+}
+
+#[cfg(test)]
+mod test {
+
+    use super::capitalize;
+    use super::remove_suffix;
+    use super::remove_to;
+
+    #[test]
+    fn test_remove_to() {
+        assert_eq!("aaa", remove_to("aaa", |c| c == '.'));
+        assert_eq!("bbb", remove_to("aaa.bbb", |c| c == '.'));
+        assert_eq!("ccc", remove_to("aaa.bbb.ccc", |c| c == '.'));
+    }
+
+    #[test]
+    fn test_remove_suffix() {
+        assert_eq!("bbb", remove_suffix("bbbaaa", "aaa"));
+        assert_eq!("aaa", remove_suffix("aaa", "bbb"));
+    }
+
+    #[test]
+    fn test_capitalize() {
+        assert_eq!("", capitalize(""));
+        assert_eq!("F", capitalize("f"));
+        assert_eq!("Foo", capitalize("foo"));
+    }
+}