add "outdated" command to check deps

Author: Frotty

README.md

@@ -60,6 +60,16 @@ The command exits with code `0` when compilation succeeds and `1` on compilation
 > grill typecheck
 ```
 
+### Checking dependency updates
+
+Use `outdated` to check whether any dependency is not on the latest commit of its configured branch
+(or repository default branch when none is specified).
+The command exits with code `0` when dependencies are up to date and `1` when updates are available.
+
+```cmd
+> grill outdated
+```
+
 
 ### Building the project
 

src/main/kotlin/file/CLICommand.kt

@@ -7,6 +7,7 @@ enum class CLICommand {
 	GENERATE,
 	TEST,
     TYPECHECK,
+    OUTDATED,
     BUILD,
     SELF_UPDATE
 }

src/main/kotlin/file/DependencyManager.kt

@@ -85,6 +85,28 @@ object DependencyManager {
         return false
     }
 
+    fun hasOutdatedDependencies(projectRoot: Path, projectConfig: WurstProjectConfigData): Boolean {
+        Log.print("Checking dependencies...\n")
+        for (dependency in projectConfig.dependencies) {
+            val (depUri, dependencyName, requestedBranch) = resolveName(dependency)
+            val branch = resolveBranch(depUri, requestedBranch)
+            Log.print("Checking dependency - $dependencyName ..")
+            val depFolder = projectRoot.resolve("_build/dependencies/$dependencyName")
+
+            if (!Files.exists(depFolder.resolve(".git"))) {
+                Log.print("missing\n")
+                return true
+            }
+
+            if (isDependencyOutdated(depFolder, depUri, branch)) {
+                Log.print("outdated\n")
+                return true
+            }
+            Log.print("ok\n")
+        }
+        return false
+    }
+
     fun cloneRepo(dependency: String, depFolder: Path) {
         val (depURI, _, requestedBranch) = resolveName(dependency)
         val branch = resolveBranch(depURI, requestedBranch)
@@ -264,4 +286,25 @@ object DependencyManager {
         }
         return false
     }
+
+    private fun isDependencyOutdated(depFolder: Path, depUri: String, branch: String): Boolean {
+        return try {
+            FileRepository(depFolder.resolve(".git").toFile()).use { repository ->
+                repository.config.setString("remote", "origin", "url", depUri)
+                repository.config.save()
+                Git(repository).use { git ->
+                    git.fetch()
+                        .setRemote("origin")
+                        .setRemoveDeletedRefs(true)
+                        .call()
+                }
+                val localHead = repository.resolve(Constants.HEAD)
+                val remoteHead = repository.resolve("refs/remotes/origin/$branch")
+                localHead == null || remoteHead == null || localHead != remoteHead
+            }
+        } catch (e: Exception) {
+            log.warn("Could not verify dependency at <$depFolder>.", e)
+            true
+        }
+    }
 }

src/main/kotlin/file/SetupApp.kt

@@ -118,6 +118,13 @@ object SetupApp {
                     typecheckProject(configData)
                 }
             }
+            setup.command == CLICommand.OUTDATED -> {
+                if (configData == null) {
+                    log.error("No wurst.build configuration found.")
+                    exitProcess(1)
+                }
+                checkProjectOutdated(configData)
+            }
             setup.command == CLICommand.BUILD -> {
                 log.info("\uD83D\uDD28 Building project..")
                 if (setup.commandArg.isBlank()) {
@@ -211,6 +218,15 @@ object SetupApp {
         }
     }
 
+    private fun checkProjectOutdated(configData: WurstProjectConfigData) {
+        val outdated = DependencyManager.hasOutdatedDependencies(setup.projectRoot, configData)
+        if (outdated) {
+            log.info("Project dependencies are outdated. Run `grill install`.")
+            exitProcess(1)
+        }
+        log.info("Project dependencies are up to date.")
+    }
+
     private fun startWurstProcess(args: ArrayList<String>): Int {
         val pb = ProcessBuilder(args)
         pb.redirectOutput(Redirect.INHERIT)

src/main/kotlin/file/SetupMain.kt

@@ -56,7 +56,7 @@ class SetupMain {
 
 			}
 		} catch(e: IllegalArgumentException) {
-			log.error("\uD83D\uDD25 Invalid grill command <$first> ! Available commands: [generate|install|remove|test|typecheck|build] <command argument>")
+			log.error("\uD83D\uDD25 Invalid grill command <$first> ! Available commands: [generate|install|remove|test|typecheck|outdated|build] <command argument>")
             exitProcess(1)
 		}
 	}