Add date and hash to publishing version

6 files changed, 74 insertions, 2 deletions

diff --git a/project/Build.scala b/project/Build.scala
index c07fab230..85a7bb861 100644
--- a/project/Build.scala
+++ b/project/Build.scala
@@ -25,7 +25,8 @@ object DottyBuild extends Build {
   override def settings: Seq[Setting[_]] = {
     super.settings ++ Seq(
       scalaVersion in Global := "2.11.5",
-      version in Global := "0.1-SNAPSHOT",
+      version in Global :=
+        "0.1-SNAPSHOT-" + VersionUtil.commitDate + "-" + VersionUtil.gitHash,
       organization in Global := "ch.epfl.lamp",
       organizationName in Global := "LAMP/EPFL",
       organizationHomepage in Global := Some(url("http://lamp.epfl.ch")),
@@ -208,7 +209,8 @@ object DottyBuild extends Build {
         "org.scala-sbt" % "api" % sbtVersion.value % "test",
         "org.specs2" %% "specs2" % "2.3.11" % "test"
       ),
-      version := "0.1.1-SNAPSHOT",
+      version :=
+        "0.1.1-SNAPSHOT-" + VersionUtil.commitDate + "-" + VersionUtil.gitHash,
       // The sources should be published with crossPaths := false, the binaries
       // are unused so it doesn't matter.
       crossPaths := false,
diff --git a/project/VersionUtil.scala b/project/VersionUtil.scala
new file mode 100644
index 000000000..338cf2d95
--- /dev/null
+++ b/project/VersionUtil.scala
@@ -0,0 +1,18 @@
+import scala.sys.process.Process
+
+object VersionUtil {
+  def executeScript(scriptName: String) = {
+    val cmd =
+      if (System.getProperty("os.name").toLowerCase.contains("windows"))
+        s"cmd.exe /c scripts\\build\\$scriptName.bat -p"
+      else s"scripts/build/$scriptName"
+    Process(cmd).lines.head.trim
+  }
+
+  /** Seven letters of the SHA hash is considered enough to uniquely identify a
+   *  commit, albeit extremely large projects - such as the Linux kernel - need
+   *  more letters to stay unique
+   */
+  def gitHash = executeScript("get-scala-commit-sha").substring(0, 7)
+  def commitDate = executeScript("get-scala-commit-date")
+}
diff --git a/scripts/build/get-scala-commit-date b/scripts/build/get-scala-commit-date
new file mode 100755
index 000000000..ef5b0f540
--- /dev/null
+++ b/scripts/build/get-scala-commit-date
@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+#
+# Usage: get-scala-commit-date [dir]
+# Figures out current commit date of a git clone.
+# If no dir is given, current working dir is used.
+#
+# Example build version string:
+#   20120312
+#
+
+[[ $# -eq 0 ]] || cd "$1"
+
+lastcommitdate=$(git log --format="%ci" HEAD | head -n 1 | cut -d ' ' -f 1)
+
+# 20120324
+echo "${lastcommitdate//-/}"
diff --git a/scripts/build/get-scala-commit-date.bat b/scripts/build/get-scala-commit-date.bat
new file mode 100644
index 000000000..735a80b92
--- /dev/null
+++ b/scripts/build/get-scala-commit-date.bat
@@ -0,0 +1,9 @@
+@echo off
+for %%X in (bash.exe) do (set FOUND=%%~$PATH:X)
+if defined FOUND (
+  bash "%~dp0\get-scala-commit-date" 2>NUL
+) else (
+  rem echo this script does not work with cmd.exe. please, install bash
+  echo unknown
+  exit 1
+)
diff --git a/scripts/build/get-scala-commit-sha b/scripts/build/get-scala-commit-sha
new file mode 100755
index 000000000..eab90a421
--- /dev/null
+++ b/scripts/build/get-scala-commit-sha
@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+#
+# Usage: get-scala-commit-sha [dir]
+# Figures out current commit sha of a git clone.
+# If no dir is given, current working dir is used.
+#
+# Example build version string:
+#   6f1c486d0ba
+#
+
+[[ $# -eq 0 ]] || cd "$1"
+
+# printf %016s is not portable for 0-padding, has to be a digit.
+# so we're stuck disassembling it.
+hash=$(git log -1 --format="%H" HEAD)
+hash=${hash#g}
+hash=${hash:0:10}
+echo "$hash"
diff --git a/scripts/build/get-scala-commit-sha.bat b/scripts/build/get-scala-commit-sha.bat
new file mode 100644
index 000000000..6559a1912
--- /dev/null
+++ b/scripts/build/get-scala-commit-sha.bat
@@ -0,0 +1,9 @@
+@echo off
+for %%X in (bash.exe) do (set FOUND=%%~$PATH:X)
+if defined FOUND (
+  bash "%~dp0\get-scala-commit-sha" 2>NUL
+) else (
+  rem echo this script does not work with cmd.exe. please, install bash
+  echo unknown
+  exit 1
+)