From 57f2f9f21a82a8b13c544d62d353894eb3e0a4c7 Mon Sep 17 00:00:00 2001
From: "Jakob L. Kreuze" <zerodaysfordays@sdf.org>
Date: Mon, 18 May 2020 11:25:02 -0400
Subject: Implement `add_tag`.

---
 src/main.rs | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/src/main.rs b/src/main.rs
index ed0965c..2739f42 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -81,6 +81,19 @@ impl TagBase {
             .collect();
         Ok(*id[0].as_ref().unwrap())
     }
+
+    /// Insert `tag` into the database, if it does not already exist.
+    fn add_tag(&self, tag: &str) -> Result<()> {
+        let exists = self
+            .conn
+            .prepare("SELECT * FROM tags WHERE name = ?")?
+            .exists(params![tag]);
+        if let Err(_) = exists {
+            self.conn
+                .execute("INSERT INTO tags (name) VALUES(?)", params![tag])?;
+        }
+        Ok(())
+    }
 }
 
 fn main() {
-- 
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