diff --git a/src/main/kotlin/me/msoucy/gbat/Main.kt b/src/main/kotlin/me/msoucy/gbat/Main.kt
index d643036..761c7be 100644
--- a/src/main/kotlin/me/msoucy/gbat/Main.kt
+++ b/src/main/kotlin/me/msoucy/gbat/Main.kt
@@ -1,9 +1,7 @@
 package me.msoucy.gbat
 
 import java.io.File
-import java.io.IOException
 import java.util.concurrent.Executors
-import java.util.concurrent.TimeUnit
 import kotlin.math.pow
 import kotlin.system.exitProcess
 import kotlin.text.Regex
@@ -77,39 +75,6 @@ class GbatArgs(parser: ArgParser) {
     val project_root by parser.positional("The root directory to inspect")
 }
 
-fun List<String>.runCommand(workingDir: File): Pair<String?,String?> {
-    try {
-        val proc = ProcessBuilder(*this.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) {
-        e.printStackTrace()
-        return Pair(null, null)
-    }
-}
-
-class GitRepo(val project_root : File, val git_exe : String) {
-    fun ls() : String {
-        val cmd = listOf(
-            git_exe,
-            "ls-tree",
-            "--full-tree",
-            "--name-only",
-            "-r",
-            "HEAD",
-            project_root.absolutePath
-        )
-        val (out, err) = cmd.runCommand(project_root)
-        return out ?: ""
-    }
-}
-
 fun main(args: Array<String>) = mainBody {
 	ArgParser(args).parseInto(::GbatArgs).run {
         val outDir = File(output)
diff --git a/src/main/kotlin/me/msoucy/gbat/Models.kt b/src/main/kotlin/me/msoucy/gbat/Models.kt
index f11ebe2..03785e1 100644
--- a/src/main/kotlin/me/msoucy/gbat/Models.kt
+++ b/src/main/kotlin/me/msoucy/gbat/Models.kt
@@ -5,16 +5,6 @@ import kotlin.io.forEachLine
 import org.jetbrains.exposed.sql.*
 import org.jetbrains.exposed.sql.transactions.transaction
 
-fun <T> Iterable<T>.copyOf(): List<T> {
-    val original = this
-    return mutableListOf<T>().apply { addAll(original) }
-}
-
-fun <T> Iterable<T>.mutableCopyOf(): MutableList<T> {
-    val original = this
-    return mutableListOf<T>().apply { addAll(original) }
-}
-
 enum class ChangeType {
     Add, Change, Remove
 }
diff --git a/src/main/kotlin/me/msoucy/gbat/Repo.kt b/src/main/kotlin/me/msoucy/gbat/Repo.kt
new file mode 100644
index 0000000..24c1a97
--- /dev/null
+++ b/src/main/kotlin/me/msoucy/gbat/Repo.kt
@@ -0,0 +1,81 @@
+package me.msoucy.gbat
+
+import java.io.File
+import java.io.IOException
+
+typealias Diff = String
+
+class GitRepo(val projectRoot : File, val git_exe : String) {
+    fun ls() : String {
+        val cmd = listOf(
+            git_exe,
+            "ls-tree",
+            "--full-tree",
+            "--name-only",
+            "-r",
+            "HEAD",
+            projectRoot.absolutePath
+        )
+        val (out, _) = cmd.runCommand(projectRoot)
+        return out ?: ""
+    }
+
+    fun root() : String? {
+        val cmd = listOf(
+            git_exe,
+            "rev-parse",
+            "--show-toplevel"
+        )
+        val (out, _) = cmd.runCommand(projectRoot)
+        return out
+    }
+
+    fun log(fname : File) : List<Pair<String, Diff>> {
+        val cmd = listOf(
+            git_exe,
+            "log",
+            "-z", // Null byte separate log entries
+            "-w", // Ignore all whitespace
+            "--follow", // Follow history through renames
+            "--patience", // Use the patience diff algorithm
+            "-p", // Show patches
+            fname.absolutePath
+        )
+        val (out, err) = cmd.runCommand(projectRoot)
+        if(err != "") {
+            System.err.println("Error from git log: " + err)
+            throw IOException(err)
+        }
+        val logEntries = (out?: "").split("\u0000").filter {it.trim().isNotEmpty()}
+        return logEntries.map {
+            val (header, diffLines) = splitEntryHeader(it)
+            val diff = diffLines.joinToString("\n")
+            val author = parseAuthor(header)
+            author to diff
+        }.filter {
+            it.first != "" && it.second != ""
+        }.reversed()
+    }
+
+    private fun parseAuthor(header : List<String>) : String {
+        val segs = header.getOrNull(1)?.trim()?.split("\\s+")?: listOf()
+        return segs.subList(1, segs.size - 2).joinToString(" ")
+    }
+
+    private fun splitEntryHeader(entry : String) : Pair<List<String>, List<String>> {
+        val lines = entry.split("\n")
+        if(lines.size < 2) {
+            return Pair(listOf(), listOf())
+        } else if(!lines.get(0).startsWith("commit")) {
+            return Pair(listOf(), listOf())
+        } else if(!lines.get(1).startsWith("Author")) {
+            return Pair(listOf(), listOf())
+        }
+        var ind = 2
+        while(ind < lines.size && !lines.get(ind).startsWith("diff")) {
+            ind++
+        }
+        return Pair(lines.subList(0, ind).copyOf(),
+                    lines.subList(ind, lines.size).copyOf())
+    }
+}
\ No newline at end of file
diff --git a/src/main/kotlin/me/msoucy/gbat/Util.kt b/src/main/kotlin/me/msoucy/gbat/Util.kt
new file mode 100644
index 0000000..8d33acb
--- /dev/null
+++ b/src/main/kotlin/me/msoucy/gbat/Util.kt
@@ -0,0 +1,25 @@
+package me.msoucy.gbat
+
+import java.io.File
+import java.io.IOException
+import java.util.concurrent.TimeUnit
+
+fun <T> Iterable<T>.copyOf() = mutableListOf<T>().also { it.addAll(this) }
+fun <T> Iterable<T>.mutableCopyOf() = mutableListOf<T>().also { it.addAll(this) }
+
+fun List<String>.runCommand(workingDir: File): Pair<String?,String?> {
+    try {
+        val proc = ProcessBuilder(*this.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) {
+        e.printStackTrace()
+        return Pair(null, null)
+    }
+}
\ No newline at end of file