Provide initial implementation for word inflection

Word inflection for nouns, adjectives has been added so it can be
initially be used in commands like 'words show'.

Word categories which have no inflections (e.g. adverbs, conjunctions,
et al) are skipped.

Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>

1 files changed, 38 insertions, 0 deletions

diff --git a/crates/cli/src/locale.rs b/crates/cli/src/locale.rs
new file mode 100644
index 0000000..f9d42b6
--- /dev/null
+++ b/crates/cli/src/locale.rs
@@ -0,0 +1,38 @@
+// Locale represents the locales accepted for delivering answers on this
+// tool. That is, it's not about i18n on the strings for this application. but
+// rather the different translations accepted in places like
+// `Word.translations`.
+pub enum Locale {
+    English,
+    Catalan,
+}
+
+impl Locale {
+    // Returns the string representation for the locale's code.
+    pub fn to_code(&self) -> &str {
+        match self {
+            Self::English => "en",
+            Self::Catalan => "ca",
+        }
+    }
+}
+
+impl std::fmt::Display for Locale {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        match self {
+            Self::English => write!(f, "english"),
+            Self::Catalan => write!(f, "català"),
+        }
+    }
+}
+
+/// Fetches the Locale object that is suitable for the current environment.
+pub fn current_locale() -> Locale {
+    let raw_locale = std::env::var("LC_ALL").unwrap_or("en".to_string());
+
+    if raw_locale.starts_with("ca") {
+        Locale::Catalan
+    } else {
+        Locale::English
+    }
+}