Implement update command

README.md

@@ -32,7 +32,7 @@ Target: x86_64-unknown-linux-gnu
 
 - Installing multiple toolchains, including both stable releases and snapshots
 - Switching which installed toolchain is active (i.e. which one is discovered via `$PATH`)
-- Updating installed toolchains to the latest available versions of those toolchains (not yet implemented)
+- Updating installed toolchains to the latest available versions of those toolchains
 - Uninstalling installed toolchains
 - Listing the toolchains that are available to install (not yet implemented)
 
@@ -175,23 +175,27 @@ $ swiftly use main-snapshot
 
 ### Updating a toolchain
 
-Update replaces a given toolchain with a later version of that toolchain. For a stable release, this means updating to a later patch version. For snapshots, this means updating to the most recently available snapshot. 
+Update replaces a given toolchain with a later version of that toolchain. For a stable release, this means updating to a later patch, minor, or major version. For snapshots, this means updating to the most recently available snapshot. 
 
-If no version is provided, update will update the currently selected toolchain to its latest version while removing the old version. The newly installed version will be used.
-
-Note that this command isn't implemented yet, but it will be included in a future release.
+If no version is provided, update will update the currently selected toolchain to its latest patch release if a release toolchain or the latest available snapshot if a snapshot. The newly installed version will be selected.
 
 ```
 $ swiftly update
 ```
 
-To update the latest installed stable version, the “latest” version can be provided:
+To update the latest installed release version to the latest available release version, the “latest” version can be provided. Note that this may update the toolchain to the next minor or even major version.
 
 ```
 swiftly update latest
 ```
 
-To update to the latest patch release of a given major/minor version, only the major/minor pair need to be provided. This will update the latest installed toolchain associated with that major/minor version to the latest patch release for that major/minor version.
+If only a major version is specified, the latest installed toolchain with that major version will be updated to the latest available release of that major version:
+
+```
+swiftly update 5
+```
+
+If the major and minor version are specified, the latest installed toolchain associated with that major/minor version will be updated to the latest available patch release for that major/minor version.
 
 ```
 swiftly update 5.3
@@ -215,6 +219,12 @@ You can also update the latest installed main snapshot to the latest available o
 swiftly update main-snapshot
 ```
 
+A specific snapshot toolchain can be updated to the newest available snapshot for that branch by including the date:
+
+```
+swiftly update 5.9-snapshot-2023-09-20
+```
+
 ### Listing toolchains available to install
 
 The `list-available` command can be used to list the latest toolchains that Apple has made available to install.

Sources/Swiftly/Install.swift

@@ -53,16 +53,25 @@ struct Install: SwiftlyCommand {
     ))
     var token: String?
 
+    public var httpClient = SwiftlyHTTPClient()
+
+    private enum CodingKeys: String, CodingKey {
+        case version, token
+    }
+
     mutating func run() async throws {
         let selector = try ToolchainSelector(parsing: self.version)
-        HTTP.githubToken = self.token
+        self.httpClient.githubToken = self.token
         let toolchainVersion = try await self.resolve(selector: selector)
-        try await Self.execute(version: toolchainVersion)
-    }
-
-    internal static func execute(version: ToolchainVersion) async throws {
         var config = try Config.load()
+        try await Self.execute(version: toolchainVersion, &config, self.httpClient)
+    }
 
+    internal static func execute(
+        version: ToolchainVersion,
+        _ config: inout Config,
+        _ httpClient: SwiftlyHTTPClient
+    ) async throws {
         guard !config.installedToolchains.contains(version) else {
             SwiftlyCore.print("\(version) is already installed, exiting.")
             return
@@ -121,7 +130,8 @@ struct Install: SwiftlyCommand {
         var lastUpdate = Date()
 
         do {
-            try await HTTP.downloadToolchain(
+            try await httpClient.downloadToolchain(
+                version,
                 url: url,
                 to: tmpFile.path,
                 reportProgress: { progress in
@@ -143,7 +153,7 @@ struct Install: SwiftlyCommand {
                     )
                 }
             )
-        } catch _ as HTTP.DownloadNotFoundError {
+        } catch _ as SwiftlyHTTPClient.DownloadNotFoundError {
             SwiftlyCore.print("\(version) does not exist, exiting")
             return
         } catch {
@@ -160,7 +170,7 @@ struct Install: SwiftlyCommand {
 
         // If this is the first installed toolchain, mark it as in-use.
         if config.inUse == nil {
-            try await Use.execute(version, config: &config)
+            try await Use.execute(version, &config)
         }
 
         SwiftlyCore.print("\(version) installed successfully!")
@@ -173,7 +183,7 @@ struct Install: SwiftlyCommand {
         case .latest:
             SwiftlyCore.print("Fetching the latest stable Swift release...")
 
-            guard let release = try await HTTP.getReleaseToolchains(limit: 1).first else {
+            guard let release = try await self.httpClient.getReleaseToolchains(limit: 1).first else {
                 throw Error(message: "couldn't get latest releases")
             }
             return .stable(release)
@@ -192,7 +202,7 @@ struct Install: SwiftlyCommand {
             SwiftlyCore.print("Fetching the latest stable Swift \(major).\(minor) release...")
             // If a patch was not provided, perform a lookup to get the latest patch release
             // of the provided major/minor version pair.
-            let toolchain = try await HTTP.getReleaseToolchains(limit: 1) { release in
+            let toolchain = try await self.httpClient.getReleaseToolchains(limit: 1) { release in
                 release.major == major && release.minor == minor
             }.first
 
@@ -210,7 +220,7 @@ struct Install: SwiftlyCommand {
             SwiftlyCore.print("Fetching the latest \(branch) branch snapshot...")
             // If a date was not provided, perform a lookup to find the most recent snapshot
             // for the given branch.
-            let snapshot = try await HTTP.getSnapshotToolchains(limit: 1) { snapshot in
+            let snapshot = try await self.httpClient.getSnapshotToolchains(limit: 1) { snapshot in
                 snapshot.branch == branch
             }.first
 

Sources/Swiftly/ListAvailable.swift

@@ -35,6 +35,12 @@ struct ListAvailable: SwiftlyCommand {
     ))
     var toolchainSelector: String?
 
+    public var httpClient = SwiftlyHTTPClient()
+
+    private enum CodingKeys: String, CodingKey {
+        case toolchainSelector
+    }
+
     internal mutating func run() async throws {
         let selector = try self.toolchainSelector.map { input in
             try ToolchainSelector(parsing: input)
@@ -47,7 +53,7 @@ struct ListAvailable: SwiftlyCommand {
             }
         }
 
-        let toolchains = try await HTTP.getReleaseToolchains()
+        let toolchains = try await self.httpClient.getReleaseToolchains()
             .map(ToolchainVersion.stable)
             .filter { selector?.matches(toolchain: $0) ?? true }
 

Sources/Swiftly/Swiftly.swift

@@ -18,6 +18,7 @@ public struct Swiftly: SwiftlyCommand {
             Use.self,
             Uninstall.self,
             List.self,
+            Update.self,
         ]
     )
 

Sources/Swiftly/Uninstall.swift

@@ -59,9 +59,8 @@ struct Uninstall: SwiftlyCommand {
             for toolchain in toolchains {
                 SwiftlyCore.print("  \(toolchain)")
             }
-            let proceed = SwiftlyCore.readLine(prompt: "Proceed? (y/n)") ?? "n"
 
-            guard proceed == "y" else {
+            guard SwiftlyCore.promptForConfirmation(defaultBehavior: true) else {
                 SwiftlyCore.print("Aborting uninstall")
                 return
             }
@@ -90,7 +89,7 @@ struct Uninstall: SwiftlyCommand {
                     ?? config.listInstalledToolchains(selector: .latest).filter({ !toolchains.contains($0) }).max()
                     ?? config.installedToolchains.filter({ !toolchains.contains($0) }).max()
                 {
-                    try await Use.execute(toUse, config: &config)
+                    try await Use.execute(toUse, &config)
                 } else {
                     // If there are no more toolchains installed, just unuse the currently active toolchain.
                     try Swiftly.currentPlatform.unUse(currentToolchain: toolchain)
@@ -99,14 +98,18 @@ struct Uninstall: SwiftlyCommand {
                 }
             }
 
-            SwiftlyCore.print("Uninstalling \(toolchain)...", terminator: "")
-            try Swiftly.currentPlatform.uninstall(toolchain)
-            config.installedToolchains.remove(toolchain)
-            try config.save()
-            SwiftlyCore.print("done")
+            try await Self.execute(toolchain, &config)
         }
 
         SwiftlyCore.print()
         SwiftlyCore.print("\(toolchains.count) toolchain(s) successfully uninstalled")
     }
+
+    static func execute(_ toolchain: ToolchainVersion, _ config: inout Config) async throws {
+        SwiftlyCore.print("Uninstalling \(toolchain)...", terminator: "")
+        try Swiftly.currentPlatform.uninstall(toolchain)
+        config.installedToolchains.remove(toolchain)
+        try config.save()
+        SwiftlyCore.print("done")
+    }
 }