RedmineBot/Sources/RedmineBotCore/Command/PostRewriteHookCommand.swift at 940635a84cb511b9412077951c8107717eb0140b · marcuswu0814/RedmineBot · GitHub

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import Foundation
import PathKit
import Commander
import SwiftCLIToolbox

public class PostRewriteHookCommand: CommandProtocol {

    public static func make() -> CommandType {
        let postRewriteHookCommand = command {
            let action = PostRewriteHookCommandAction()

            action.doAction()
        }

        return postRewriteHookCommand
    }

}

struct CommitDiff {
    var oldHash: String
    var newHash: String
}

class PostRewriteHookCommandAction {

    lazy var provider = CommitsDiffReader()
    lazy var git: GitProtocol.Type = Git.self
    lazy var system: SystemProtocol = System()
    lazy var request = CommentRequest.defaultRequest()

    func doAction() {
        let commitsDiff = provider.commitsDiff()
        let repoName = git.repoName()
        let branchName = git.branchName()

        commitsDiff.forEach { commitDiff in
            guard let issuesNumber = processIssuesNumber(commitDiff) else {
                return
            }

            let content =
            """
            Commit already rewrite,
            \(commitDiff.oldHash) -> \(commitDiff.newHash)

            \(commitMessage(commitDiff))
            """

            let context = CommentContext(content: content,
                                         authorName: authorName(commitDiff),
                                         gitRepoName: repoName,
                                         gitBranchName: branchName)

            issuesNumber.forEach({ issueNumber in
                request.send(to: issueNumber, wtih: context)
            })
        }
    }

    private func commitMessage(_ commitDiff: CommitDiff) -> String {
        guard let commitMessage = git.commitMessage(commitDiff.newHash) else {
            system.printFatalError("Ran `git show` fail with sha \(commitDiff.newHash)")
        }

        return commitMessage
    }

    private func authorName(_ commitDiff: CommitDiff) -> String {
        guard let authorName = git.authorName(commitDiff.newHash) else {
            system.printFatalError("Ran `git show` fail with sha \(commitDiff.newHash)")
        }

        return authorName
    }

    private func processIssuesNumber(_ commitDiff: CommitDiff) -> [Int]? {
        guard let issuesNumber = git.commitTitle(commitDiff.newHash)?.findIssuesNumber() else {
            return nil
        }

        // Remove issue string's `#`, i.g. #12345 -> 12345
        return issuesNumber.map { Int($0.dropFirst())! }
    }

}

class CommitsDiffReader {

    public func commitsDiff() -> [CommitDiff] {
        var commitsDiff = [CommitDiff]()

        while let string = readLine() {
            let hashSplit = string.split(separator: " ").map{ String($0) }

            let commitDiff = CommitDiff(oldHash: hashSplit[0], newHash: hashSplit[1])

            commitsDiff.append(commitDiff)
        }

        return commitsDiff
    }

}