Use native git in GitArchiver if possible (#193)

orx-jvm/orx-git-archiver/src/main/kotlin/GitArchiver.kt

@@ -1,15 +1,14 @@
 package org.openrndr.extra.gitarchiver
 
 import mu.KotlinLogging
-import org.eclipse.jgit.api.Git
-import org.eclipse.jgit.api.errors.EmptyCommitException
-import org.eclipse.jgit.lib.Constants
-import org.eclipse.jgit.lib.Repository
-import org.eclipse.jgit.storage.file.FileRepositoryBuilder
 import org.openrndr.AssetMetadata
 import org.openrndr.Extension
 import org.openrndr.Program
-import java.io.File
+
+internal interface GitProvider {
+    fun commitChanges(commitMessage: String)
+    fun headReference() : String
+}
 
 val logger = KotlinLogging.logger { }
 
@@ -21,39 +20,13 @@ class GitArchiver : Extension {
 
     var autoCommitMessage = "auto commit"
 
-    private val repo = FileRepositoryBuilder().setGitDir(File("./.git")).build()
-    private val git = Git(repo)
-
-    fun commitChanges() {
-        try {
-            git.commit().setAll(true).setAllowEmpty(false).setMessage(autoCommitMessage).call()
-            logger.info { "git repository is now at ${commitHash.take(7)}" }
-        } catch (e: EmptyCommitException) {
-            logger.info { "no changes" }
-        }
-    }
-
-    fun tag(name: String): Boolean {
-        val existing = git.tagList().call().find { it.name == name }
-        if (existing != null) {
-            git.tag().setName(name).call()
-        } else {
-            logger.warn { "tag $name exists" }
-        }
-        return existing != null
-    }
-
-    val commitHash: String
-        get() {
-            val id = repo.resolve(Constants.HEAD)
-            return id.name
-        }
+    private val git: GitProvider = if (nativeGitInstalled()) NativeGit() else JavaGit()
 
     override fun setup(program: Program) {
         val oldMetadataFunction = program.assetMetadata
         program.assetMetadata = {
             val oldMetadata = oldMetadataFunction()
-            val commitHash = this.commitHash.take(7)
+            val commitHash = git.headReference()
             program.assetProperties["git-commit-hash"] = commitHash
             AssetMetadata(
                 oldMetadata.programName,
@@ -63,13 +36,12 @@ class GitArchiver : Extension {
 
         program.requestAssets.listeners.add(0, {
             if (commitOnRequestAssets) {
-                commitChanges()
+                git.commitChanges(autoCommitMessage)
             }
         })
 
-
         if (commitOnRun) {
-            commitChanges()
+            git.commitChanges(autoCommitMessage)
         }
     }
 }

orx-jvm/orx-git-archiver/src/main/kotlin/JavaGit.kt

@@ -0,0 +1,36 @@
+package org.openrndr.extra.gitarchiver
+
+import org.eclipse.jgit.api.Git
+import org.eclipse.jgit.api.errors.EmptyCommitException
+import org.eclipse.jgit.lib.Constants
+import org.eclipse.jgit.storage.file.FileRepositoryBuilder
+import java.io.File
+
+class JavaGit : GitProvider {
+    private val repo = FileRepositoryBuilder().setGitDir(File("./.git")).build()
+    private val git = Git(repo)
+
+    override fun commitChanges(commitMessage: String) {
+        try {
+            git.commit().setAll(true).setAllowEmpty(false).setMessage(commitMessage).call()
+            logger.info { "git repository is now at ${headReference()}" }
+        } catch (e: EmptyCommitException) {
+            logger.info { "no changes" }
+        }
+    }
+
+    override fun headReference() : String {
+        val id = repo.resolve(Constants.HEAD)
+        return id.name.take(7)
+    }
+
+//    fun tag(name: String): Boolean {
+//        val existing = git.tagList().call().find { it.name == name }
+//        if (existing != null) {
+//            git.tag().setName(name).call()
+//        } else {
+//            logger.warn { "tag $name exists" }
+//        }
+//        return existing != null
+//    }
+}

orx-jvm/orx-git-archiver/src/main/kotlin/NativeGit.kt

@@ -0,0 +1,49 @@
+package org.openrndr.extra.gitarchiver
+
+import java.io.File
+import java.io.IOException
+import java.util.concurrent.TimeUnit
+
+private val dir = File(".")
+
+class NativeGit : GitProvider {
+    override fun commitChanges(commitMessage: String) {
+        val gitStatus = "git status --porcelain".runCommand(dir)!!
+        if (gitStatus.first.isNotBlank()){
+            if (gitStatus.first.contains("Not a git repository")){
+                logger.error { "Can't commit changes because the working directory is not a git repository" }
+            } else {
+                "git add .".runCommand(dir)
+                "git commit -m \"${commitMessage}\"".runCommand(dir)
+                logger.info { "git repository is now at ${headReference()}" }
+            }
+        } else {
+            logger.info { "no changes" }
+        }
+    }
+
+    override fun headReference(): String {
+        return "git rev-parse --short HEAD".runCommand(dir)!!.first
+    }
+}
+
+internal fun nativeGitInstalled(): Boolean {
+    return "git --version".runCommand(dir) != null
+}
+
+// Adapted from https://stackoverflow.com/questions/35421699/how-to-invoke-external-command-from-within-kotlin-code
+private fun String.runCommand(workingDir: File): Pair<String, String>? {
+    try {
+        val parts = this.split("\\s".toRegex())
+        val proc = ProcessBuilder(*parts.toTypedArray())
+            .directory(workingDir)
+            .redirectOutput(ProcessBuilder.Redirect.PIPE)
+            .redirectError(ProcessBuilder.Redirect.PIPE)
+            .start()
+
+        proc.waitFor(60, TimeUnit.MINUTES)
+        return Pair(proc.inputStream.bufferedReader().readText(), proc.errorStream.bufferedReader().readText())
+    } catch(e: IOException) {
+        return null
+    }
+}