refactor: HintAlignment -> ui/hint_alignment.rs

src/ui/hint_alignment.rs

@@ -0,0 +1,26 @@
+use clap::Clap;
+use std::str::FromStr;
+
+use crate::error::ParseError;
+
+/// Describes if, during rendering, a hint should aligned to the leading edge of
+/// the matched text, or to its trailing edge.
+#[derive(Debug, Clap)]
+pub enum HintAlignment {
+    Leading,
+    Trailing,
+}
+
+impl FromStr for HintAlignment {
+    type Err = ParseError;
+
+    fn from_str(s: &str) -> Result<HintAlignment, ParseError> {
+        match s {
+            "leading" => Ok(HintAlignment::Leading),
+            "trailing" => Ok(HintAlignment::Trailing),
+            _ => Err(ParseError::ExpectedString(String::from(
+                "leading or trailing",
+            ))),
+        }
+    }
+}