Load SQL queries from text file

Queries.sql

-- all_things
SELECT * FROM things

-- thing_with_id
SELECT * FROM things WHERE id = :id

Sequel.swift

import Foundation

class Sequel {

    static let sharedInstance = Sequel()

    var queries: [String: String] = [:]

    init() {

        let path = NSBundle.mainBundle().pathForResource("Queries", ofType: "sql")

        var err: NSError?
        if let text = NSString(contentsOfFile: path!, encoding: NSUTF8StringEncoding, error: &err) {

            let lines = text.componentsSeparatedByString("\n") as! [String]

            var curKey: String?
            var curSql: String?

            for line in lines {
                if line.isEmpty {
                    continue
                }

                // New query
                if line.hasPrefix("--") {

                    // Save the last query we parsed
                    if let key = curKey, let sql = curSql {
                        queries[key] = sql
                    }

                    curKey = line.substringFromIndex(advance(line.startIndex, 2)).trim()
                    curSql = nil
                }
                    
                else {
                    if let sql = curSql {
                        curSql = join(" ", [sql, line.trim()])
                    }
                    else {
                        curSql = line.trim()
                    }
                }
            }

            // Save the last query we parsed
            if let key = curKey, let sql = curSql {
                queries[key] = sql
            }
        }
        else {
            fatalError("Unable to load queries: \(err)")
        }
    }

    subscript(key: String) -> String {
        return queries[key]!
    }
}

Uses String.trim() extension found here: http://themainthread.com/blog/2015/04/trim-a-string-in-swift.html