From c54e8928d3afa769efeff6388eaf41f4dbb6540a Mon Sep 17 00:00:00 2001
From: Tom Goff <tomgoff@users.noreply.github.com>
Date: Mon, 9 Nov 2015 13:09:31 -0500
Subject: [PATCH] Include revision information in non-release version strings,
 if available.

---
 configure.ac |  2 +-
 revision.sh  | 87 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 88 insertions(+), 1 deletion(-)
 create mode 100755 revision.sh

diff --git a/configure.ac b/configure.ac
index 11a69fcf..ef3b641f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -12,7 +12,7 @@
 #
 # this defines the CORE version number, must be static for AC_INIT
 #
-AC_INIT(core, 4.8dev1, core-dev@pf.itd.nrl.navy.mil)
+AC_INIT(core, m4_esyscmd_s([./revision.sh 4.8]), core-dev@pf.itd.nrl.navy.mil)
 VERSION=$PACKAGE_VERSION
 CORE_VERSION=$PACKAGE_VERSION
 CORE_VERSION_DATE=20150605
diff --git a/revision.sh b/revision.sh
new file mode 100755
index 00000000..589c4726
--- /dev/null
+++ b/revision.sh
@@ -0,0 +1,87 @@
+#!/bin/sh
+
+if [ $# -ne 1 ]; then
+    echo "usage: $(basename $0) <base version>" >&2
+    exit 1
+fi
+
+git_revision()
+{
+    local ver describe commits branch sha dirty
+
+    ver=$1
+
+    describe=$(git describe --tags --dirty  2> /dev/null)
+    if [ "$describe" ]; then
+        echo "$describe" | sed -e 's/^release-//'
+        return
+    fi
+
+    if [ ! "$(git tag -l release-$ver)" ]; then
+        ver="unknown"
+    else
+        commits=$(git rev-list release-${ver}^..HEAD | wc -l)
+        if [ $commits -eq 0 ]; then
+            commits=""
+        else
+            commits=".$commits"
+        fi
+    fi
+
+    branch=$(git rev-parse --abbrev-ref HEAD)
+    if [ "$branch" = master ]; then
+        branch=""
+    else
+        branch=".$(echo -n $branch | tr -sC '.[:alnum:]' '[.*]')"
+    fi
+
+    if [ "$ver" = "unknown" -o "$commits" ]; then
+        sha=.g$(git log -1 --pretty="%h")
+    fi
+
+    if ! git diff --quiet; then
+        dirty=".dirty"
+    else
+        dirty=""
+    fi
+
+    echo ${ver}${commits}${branch}${sha}${dirty}
+}
+
+svn_revision()
+{
+    local ver tagrev commits rev dirty
+
+    ver=$1
+
+    tagrev=$(svn log -q ^/tags/release-$ver --limit 1 2> /dev/null | \
+        awk '/^r/ {print $1}')
+    if [ ! "$tagrev" ];then
+        ver="unknown"
+    else
+        commits=$(svn log -q -r $tagrev:HEAD | grep '^r' | wc -l)
+        if [ $commits -eq 0 ]; then
+            commits=""
+        else
+            commits=".$commits"
+        fi
+    fi
+
+    if [ "$ver" = "unknown" -o "$commits" ]; then
+        rev=.s$(svn info | awk '/^Revision:/ {print $2}')
+    fi
+
+    if (svn status -q | grep -q .); then
+        dirty=".dirty"
+    fi
+
+    echo ${ver}${commits}${rev}${dirty}
+}
+
+if test -d .git || git rev-parse --git-dir > /dev/null 2>&1; then
+    git_revision "$@"
+elif test -d .svn || svn info > /dev/null 2>&1; then
+    svn_revision "$@"
+else
+    echo "$@"
+fi