/*
* Copyright (c) 2017 N26 GmbH.
*
* This file is part of Bob.
*
* Bob is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Bob is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Bob. If not, see .
*/
import Foundation
import Vapor
public extension GitHub {
func branchExists(_ branch: BranchName) throws -> Future<(branchExists: Bool, possibleMatches: [Branch])> {
return try self.branches().map { branches -> (branchExists: Bool, possibleMatches: [Branch]) in
var branchExists = false
let possibleMatches = branches.filter { remoteBranch -> Bool in
if remoteBranch.name == branch {
branchExists = true
} else {
let distance = remoteBranch.name.levenshtein(to: branch)
if Double(distance) / Double(branch.count) < 0.25 {
return true
}
}
return false
}
return (branchExists, possibleMatches)
}
}
/**
Helper method to assert that the specified branch exists.
The Future's `futureResult` is called when the branch does exist otherwise it's `.failure`
```
try gitHub.assertBranchExists(branch).map {
// do something with the branch
}.catch { error in
// branch does not exists
}
```
*/
func assertBranchExists(_ branch: BranchName) throws -> Future {
return try branchExists(branch).map { result in
if !result.branchExists {
throw GitHubError.invalidBranch(name: branch)
}
}
}
}