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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift open source project
//
// Copyright (c) 2014-2021 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See http://swift.org/LICENSE.txt for license information
// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
import Basics
import CoreCommands
import PackageModel
import enum TSCBasic.ProcessEnv
import func TSCBasic.exec
/// A card displaying a ``Snippet`` at the terminal.
struct SnippetCard: Card {
enum Error: Swift.Error, CustomStringConvertible {
case cantRunSnippet(reason: String)
var description: String {
switch self {
case let .cantRunSnippet(reason):
return "Can't run snippet: \(reason)"
}
}
}
/// The snippet to display in the terminal.
var snippet: Snippet
/// The snippet's index within its group.
var number: Int
/// The tool used for eventually building and running a chosen snippet.
var swiftCommandState: SwiftCommandState
func render() -> String {
var rendered = colorized {
brightYellow {
"# "
snippet.name
}
"\n\n"
}.terminalString()
if !snippet.explanation.isEmpty {
rendered += brightBlack {
snippet.explanation
.split(separator: "\n", omittingEmptySubsequences: false)
.map { "// " + $0 }
.joined(separator: "\n")
}.terminalString()
rendered += "\n\n"
}
rendered += snippet.presentationCode
return rendered
}
var inputPrompt: String? {
return "\nRun this snippet? [R: run, or press Enter to return]"
}
func acceptLineInput<S>(_ line: S) -> CardEvent? where S : StringProtocol {
let trimmed = line.drop { $0.isWhitespace }.prefix { !$0.isWhitespace }.lowercased()
guard !trimmed.isEmpty else {
return .pop()
}
switch trimmed {
case "r", "run":
do {
try runExample()
} catch {
return .pop(SnippetCard.Error.cantRunSnippet(reason: error.localizedDescription))
}
break
case "c", "copy":
print("Unimplemented")
break
default:
break
}
return .pop()
}
func runExample() throws {
print("Building '\(snippet.path)'\n")
let buildSystem = try swiftCommandState.createBuildSystem(explicitProduct: snippet.name)
try buildSystem.build(subset: .product(snippet.name))
let executablePath = try swiftCommandState.productsBuildParameters.buildPath.appending(component: snippet.name)
if let exampleTarget = try buildSystem.getPackageGraph().module(for: snippet.name, destination: .destination) {
try ProcessEnv.chdir(exampleTarget.sources.paths[0].parentDirectory)
}
try exec(path: executablePath.pathString, args: [])
}
}
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