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Stop writing temporary files when shelling out to less

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This commit is contained in:
Sami Samhuri 2019-12-03 18:18:24 -08:00
parent 447da5fdc1
commit e53fda0851
2 changed files with 23 additions and 8 deletions
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5
SiteGenerator/Package.swift
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@ -1,10 +1,13 @@
// swift-tools-version:5.0
// swift-tools-version:5.1
// The swift-tools-version declares the minimum version of Swift required to build this package.
import PackageDescription
let package = Package(
name: "SiteGenerator",
platforms: [
.macOS(.v10_15),
],
dependencies: [
.package(url: "https://github.com/stencilproject/Stencil.git", from: "0.13.0"),
.package(url: "https://github.com/johnsundell/ink.git", from: "0.1.0"),

26
SiteGenerator/Sources/SiteGenerator/Renderers/LessRenderer.swift
View file

@ -8,6 +8,10 @@
import Foundation
public final class LessRenderer: Renderer {
enum Error: Swift.Error {
case invalidCSSData(Data)
}
public func canRenderFile(named filename: String, withExtension ext: String) -> Bool {
ext == "less"
}
@ -27,12 +31,17 @@ public final class LessRenderer: Renderer {
_ = try? FileManager.default.removeItem(at: tempDir)
}
let timestamp = Date().timeIntervalSince1970
let lessURL = tempDir.appendingPathComponent("LessParser-in-\(timestamp).less")
let cssURL = tempDir.appendingPathComponent("LessParser-out-\(timestamp).css")
try less.write(to: lessURL, atomically: true, encoding: .utf8)
shell(lesscPath, lessURL.path, cssURL.path)
return try String(contentsOf: cssURL, encoding: .utf8)
let lessIn = Pipe()
lessIn.fileHandleForWriting.write(Data(less.utf8))
try lessIn.fileHandleForWriting.close()
let cssOut = Pipe()
shell(lesscPath, "-", stdin: lessIn, stdout: cssOut)
let cssData = cssOut.fileHandleForReading.readDataToEndOfFile()
_ = try? cssOut.fileHandleForReading.close()
guard let css = String(data: cssData, encoding: .utf8) else {
throw Error.invalidCSSData(cssData)
}
return css
}
let lesscPath = URL(fileURLWithPath: #file)
@ -45,10 +54,13 @@ public final class LessRenderer: Renderer {
.path
@discardableResult
func shell(_ args: String...) -> Int32 {
func shell(_ args: String..., stdin: Pipe? = nil, stdout: Pipe? = nil, stderr: Pipe? = nil) -> Int32 {
let task = Process()
task.launchPath = "/usr/bin/env"
task.arguments = args
task.standardInput = stdin
task.standardOutput = stdout
task.standardError = stderr
task.launch()
task.waitUntilExit()
return task.terminationStatus