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GitFileInfo.swift
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GitFileInfo.swift
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//
// GitFileInfo.swift
// SwiftFormat
//
// Created by Hampus Tågerud on 2023-08-08.
// Copyright 2023 Nick Lockwood and the SwiftFormat project authors
//
// Distributed under the permissive MIT license
// Get the latest version from here:
//
// https://github.com/nicklockwood/SwiftFormat
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
//
import Foundation
struct GitFileInfo {
var authorName: String?
var authorEmail: String?
var creationDate: Date?
}
extension GitFileInfo {
init?(url: URL) {
guard let gitRoot = getGitRoot(url.deletingLastPathComponent()),
let commitHash = getCommitHash(url, root: gitRoot),
let gitInfo = getCommitInfo((commitHash, gitRoot))
else {
return nil
}
self = gitInfo
}
var author: String? {
if let authorName = authorName {
if let authorEmail = authorEmail {
return "\(authorName) <\(authorEmail)>"
}
return authorName
}
return authorEmail
}
}
private extension String {
func shellOutput(cwd: URL? = nil) -> String? {
#if os(macOS) || os(Linux) || os(Windows)
let process = Process()
let pipe = Pipe()
process.executableURL = URL(fileURLWithPath: "/bin/bash")
process.arguments = ["-c", self]
process.standardOutput = pipe
process.standardError = pipe
if let safeCWD = cwd {
process.currentDirectoryURL = safeCWD
}
let file = pipe.fileHandleForReading
do { try process.run() }
catch { return nil }
process.waitUntilExit()
guard process.terminationStatus == 0 else {
return nil
}
let outputData = file.readDataToEndOfFile()
return String(data: outputData, encoding: .utf8)?
.trimmingCharacters(in: .whitespacesAndNewlines)
#else
return nil
#endif
}
}
private let getGitRoot: (URL) -> URL? = memoize({ $0.relativePath }) { url in
let dir = "git rev-parse --show-toplevel".shellOutput(cwd: url)
guard let root = dir, FileManager.default.fileExists(atPath: root) else {
return nil
}
return URL(fileURLWithPath: root, isDirectory: true)
}
// If a file has never been committed, default to the local git user for the repository
private let getDefaultGitInfo: (URL) -> GitFileInfo = memoize({ $0.relativePath }) { url in
let name = "git config user.name".shellOutput(cwd: url)
let email = "git config user.email".shellOutput(cwd: url)
return GitFileInfo(authorName: name, authorEmail: email)
}
private func getCommitHash(_ url: URL, root: URL) -> String? {
let command = [
"git log",
"--follow", // keep tracking file across renames
"--diff-filter=A",
"--author-date-order",
"--pretty=%H",
url.relativePath,
]
.filter { ($0?.count ?? 0) > 0 }
.joined(separator: " ")
let output = command.shellOutput(cwd: root)
guard let safeValue = output, !safeValue.isEmpty else { return nil }
if safeValue.contains("\n") {
let parts = safeValue.split(separator: "\n")
if parts.count > 1, let first = parts.first {
return String(first)
}
}
return safeValue
}
private let getCommitInfo: ((String, URL)) -> GitFileInfo? = memoize(
{ hash, root in hash + root.relativePath },
{ hash, root in
let format = #"{"name":"%an","email":"%ae","time":"%at"}"#
let command = "git show --format='\(format)' -s \(hash)"
guard let commitInfo = command.shellOutput(cwd: root),
let commitData = commitInfo.data(using: .utf8),
let dict = try? JSONDecoder().decode([String: String].self, from: commitData)
else {
return nil
}
let defaultInfo = getDefaultGitInfo(root)
let (name, email) = (dict["name"] ?? defaultInfo.authorName, dict["email"] ?? defaultInfo.authorEmail)
var date: Date?
if let createdAtString = dict["time"],
let interval = TimeInterval(createdAtString)
{
date = Date(timeIntervalSince1970: interval)
}
return GitFileInfo(authorName: name,
authorEmail: email,
creationDate: date)
}
)
private func memoize<K, T>(_ keyFn: @escaping (K) -> String?,
_ workFn: @escaping (K) -> T) -> (K) -> T
{
let lock = NSLock()
var cache: [String: T] = [:]
return { input in
let key = keyFn(input) ?? "@nil"
lock.lock()
defer { lock.unlock() }
if let value = cache[key] {
return value
}
let newValue = workFn(input)
cache[key] = newValue
return newValue
}
}