Add git command to create branch when creating a issue

src/git.rs

@@ -13,3 +13,20 @@ pub fn get_branch() -> Result<String, String> {
         Err(String::from_utf8(output.stderr).unwrap())
     }
 }
+
+pub fn create_branch(branch_name: String) -> Result<String, String> {
+    let output = std::process::Command::new("git")
+        .arg("checkout")
+        .arg("-b")
+        .arg(branch_name)
+        .output()
+        .map_err(|e| e.to_string())?;
+
+    if output.status.success() {
+        String::from_utf8(output.stdout)
+            .map(|s| s.trim().to_string())
+            .map_err(|e| e.to_string())
+    } else {
+        Err(String::from_utf8(output.stderr).unwrap())
+    }
+}

src/issue.rs

@@ -433,7 +433,7 @@ pub fn create(
     state: State,
     assignee_id: String,
     priority: Priority,
-) -> Result<String, String> {
+) -> Result<(String, String), String> {
     let priority = priority::priority_to_int(&priority);
     let response = request::Gql::new(config, token, ISSUE_CREATE_DOC)
         .put_string("title", title)
@@ -449,7 +449,7 @@ pub fn create(
         url, branch_name, ..
     } = issue_create_response(response)?;
 
-    Ok(format!("{url}\n{branch_name}"))
+    Ok((branch_name.clone(), format!("{url}\n{branch_name}")))
 }
 
 pub fn list(
@@ -702,7 +702,10 @@ mod tests {
         );
         assert_eq!(
             result,
-            Ok("https://linear.app/vardy/issue/BE-3354/test\nbe-3354-test".to_string())
+            Ok((
+                "be-3354-test".to_string(),
+                "https://linear.app/vardy/issue/BE-3354/test\nbe-3354-test".to_string()
+            ))
         );
         mock.assert();
     }

src/main.rs

@@ -251,6 +251,19 @@ fn issue_create(cli: Cli, args: &IssueCreate) -> Result<String, String> {
         viewer.id,
         priority,
     )
+    .map(|(branch_name, url)| {
+        match git::create_branch(branch_name.clone()) {
+            Ok(_) => {
+                let success_msg = format!("✓ Created git branch: {}", branch_name);
+                eprintln!("{}", success_msg.green());
+            }
+            Err(e) => {
+                let warning_msg = format!("⚠ Could not create git branch '{}': {}", branch_name, e);
+                eprintln!("{}", warning_msg.yellow());
+            }
+        }
+        url
+    })
 }
 
 fn issue_view(cli: Cli, args: &IssueView) -> Result<String, String> {