Implement generation status

Sources/XCHammer/Generator.swift

@@ -36,7 +36,7 @@ enum Generator {
     /// @note this version is written into the `XCHAMMER_DEPS_HASH` build setting
     /// the version can be extracted with a simple search: i.e.
     /// grep -m 1 XCHAMMER_DEPS_HASH $PROJ | sed 's,.*version:\(.*\):.*,\1,g'
-    public static let BinaryVersion = "0.1.2"
+    public static let BinaryVersion = "0.1.3"
 
     /// Used to store the `depsHash` into the project
     static let DepsHashSettingName = "XCHAMMER_DEPS_HASH"
@@ -91,18 +91,28 @@ enum Generator {
         // Use whatever command and XCHammer this project was built with
         let generateCommand = CommandLine.arguments.filter { $0 != "--force" }
 
+        let genStatusPath: String
+        if let xcworkspacePath = genOptions.xcworkspacePath {
+            genStatusPath = XCHammerAsset.genStatus.getPath(underProj:
+                    xcworkspacePath)
+        } else {
+            genStatusPath = XCHammerAsset.genStatus.getPath(underProj:
+                    genOptions.outputProjectPath)
+        }
+
         // Exit with a non 0 status to ensure Xcode reloads the project ( by
         // forcing another build in the future )
         // Determine state by comparing timestamps of the script.
         let updateScript = """
         # This file is governed by XCHammer
+        set -e
         if [[ $ACTION == "clean" ]]; then
             exit 0
         fi
 
-        PREV_STAT=`stat -f %c "$0"`
+        PREV_STAT=`stat -f %c "\(genStatusPath)"`
         \(generateCommand.joined(separator: " "))
-        STAT=`stat -f %c "$0"`
+        STAT=`stat -f %c "\(genStatusPath)"`
         if [[ "$PREV_STAT" != "$STAT" ]]; then
             echo "error: Xcode project was out-of-date so we updated it for you! Please build again."
             exit 1
@@ -305,6 +315,13 @@ enum Generator {
              fatalError("Can't write BUILD file")
         }
 
+        let genStatusPath = XCHammerAsset.genStatus.getPath(underProj:
+                tempProjectPath)
+        guard FileManager.default.createFile(atPath: genStatusPath,
+                contents: "".data(using: .utf8), attributes: nil) else {
+             fatalError("Can't write genStatus")
+        }
+
         // Add the entitilement rules to the queried rules
         let targetsToBuild = genfileLabels + entitlementRules
                 .map { BuildLabel("/" + relativeProjDir + "/XCHammerAssets:" + $0.name) }
@@ -642,6 +659,19 @@ enum Generator {
                     depsHash: depsHash)
         })
 
+        // Write the genStatus into the workspace
+        if let xcworkspacePath = xcworkspacePath {
+            try? FileManager.default.createDirectory(atPath:
+                    (xcworkspacePath + Path("XCHammerAssets")).string,
+                    withIntermediateDirectories: true,
+                    attributes: [:])
+            let genStatusPath = XCHammerAsset.genStatus.getPath(underProj:
+                    xcworkspacePath)
+            guard FileManager.default.createFile(atPath: genStatusPath,
+                    contents: "".data(using: .utf8), attributes: nil) else {
+                 fatalError("Can't write genStatus")
+            }
+        }
         return results.first ?? .success()
     }
 }

Sources/XCHammer/XCHammerAsset.swift

@@ -33,6 +33,11 @@ enum XCHammerAsset: String {
 
     case genLog = "HammerLog.txt"
 
+    /// This file is used to track the status of XCHammer and is updated when we
+    /// successfully run. Do not use this for anything else, as it is not part
+    /// the Xcode project and is unstable.
+    case genStatus = "genStatus"
+
     func getPath() -> String {
         return "XCHammerAssets/" + self.rawValue
     }

sample/UrlGet/UrlGet.xcodeproj/XCHammerAssets/updateXcodeProj.sh

@@ -1,11 +1,12 @@
 # This file is governed by XCHammer
+set -e
 if [[ $ACTION == "clean" ]]; then
     exit 0
 fi
 
-PREV_STAT=`stat -f %c "$0"`
+PREV_STAT=`stat -f %c "/Users/jerry/Projects/xchammer-github/sample/UrlGet/UrlGet.xcodeproj/XCHammerAssets/genStatus"`
 /Users/jerry/Projects/xchammer-github/.build/debug/XCHammer generate /Users/jerry/Projects/xchammer-github/sample/UrlGet/XCHammer.yaml --workspace_root /Users/jerry/Projects/xchammer-github/sample/UrlGet
-STAT=`stat -f %c "$0"`
+STAT=`stat -f %c "/Users/jerry/Projects/xchammer-github/sample/UrlGet/UrlGet.xcodeproj/XCHammerAssets/genStatus"`
 if [[ "$PREV_STAT" != "$STAT" ]]; then
     echo "error: Xcode project was out-of-date so we updated it for you! Please build again."
     exit 1