✨ feat(label): implement add label command

- adds a new subcommand to add labels to existing rules
- removes list label subcommand

src/cli/config_cli/label_cli/add_cli.rs

@@ -0,0 +1,23 @@
+use clap::Parser;
+
+use cull_gmail::{Config, Error, Result};
+
+#[derive(Debug, Parser)]
+pub struct AddCli {
+    /// Id of the rule on which action applies
+    #[clap(short, long)]
+    id: usize,
+    /// Label to add to the rule
+    #[clap(short, long)]
+    label: String,
+}
+
+impl AddCli {
+    pub fn run(&self, mut config: Config) -> Result<()> {
+        if config.get_rule(self.id).is_none() {
+            return Err(Error::RuleNotFound(self.id));
+        }
+
+        config.add_label_to_rule(self.id, &self.label)
+    }
+}

src/config_cli/label_cli/list_cli.rs

@@ -1,29 +0,0 @@
-use clap::Parser;
-
-use cull_gmail::{Config, Error, Result};
-
-#[derive(Debug, Parser)]
-pub struct ListCli {
-    /// Id of the rule on which action applies
-    #[clap(short, long)]
-    id: usize,
-}
-
-impl ListCli {
-    pub fn run(&self, config: Config) -> Result<()> {
-        let Some(rule) = config.get_rule(self.id) else {
-            return Err(Error::RuleNotFound(self.id));
-        };
-
-        print!("Labels in rule: ");
-        for (i, label) in rule.labels().iter().enumerate() {
-            if i != 0 {
-                print!(", {label}");
-            } else {
-                print!("`{label}");
-            }
-        }
-        println!("`");
-        Ok(())
-    }
-}