Add functions for tox crate version information

tox/src/lib.rs

@@ -4,3 +4,39 @@ pub use tox_core as core;
 pub use tox_crypto as crypto;
 pub use tox_encryptsave as encryptsave;
 pub use tox_packet as packet;
+
+pub fn crate_version() -> String {
+    env!("CARGO_PKG_VERSION").to_string()
+}
+pub fn crate_version_major() -> u32 {
+    env!("CARGO_PKG_VERSION_MAJOR").parse().expect("Invalid major version")
+}
+pub fn crate_version_minor() -> u32 {
+    env!("CARGO_PKG_VERSION_MINOR").parse().expect("Invalid minor version")
+}
+pub fn crate_version_patch() -> u32 {
+    env!("CARGO_PKG_VERSION_PATCH").parse().expect("Invalid patch version")
+}
+
+#[cfg(test)]
+mod tests {
+    #[test]
+    fn crate_version_is_not_empty() {
+        assert_ne!(crate::crate_version(), "");
+    }
+
+    #[test]
+    fn crate_version_major() {
+        crate::crate_version_major();
+    }
+
+    #[test]
+    fn crate_version_minor() {
+        crate::crate_version_minor();
+    }
+
+    #[test]
+    fn crate_version_patch() {
+        crate::crate_version_patch();
+    }
+}