#!/bin/sh

# Arguments given? Show help text.

if [ "$#" != "0" ]; then

	cat <<EOF

Usage: ./findversion.sh

Finds the current revision and if the code is modified.

REV

    a string describing what version of the code the current checkout is

    based on. The exact format of this string depends on the version

    control system in use, but it tries to identify the revision used as

    close as possible (using the svn revision number or hg/git hash).

    This also includes an indication of whether the checkout was

    modified and which branch was checked out. This value is not

    guaranteed to be sortable, but is mainly meant for identifying the

    revision and user display.

    If no revision identifier could be found, this is left empty.

REV_NR

    this number will not increase on new commits.

    If no revision number could be found, this is left empty.

MODIFIED

    Whether (the src directory of) this checkout is modified or not. A

    value of 0 means not modified, a value of 2 means it was modified.

    Modification is determined in relation to the commit identified by

    REV, so not in relation to the svn revision identified by REV_NR.

    A value of 1 means that the modified status is unknown, because this

    is not an svn/git/hg checkout for example.

By setting the AWK environment variable, a caller can determine which

version of "awk" is used. If nothing is set, this script defaults to

"awk".

EOF

exit 1;

fi

# Allow awk to be provided by the caller.

if [ -z "$AWK" ]; then

	AWK=awk

fi

SRC_DIR=src

# Determine if we are using a modified version

# Assume the dir is not modified

MODIFIED="0"

if [ -d "$ROOT_DIR/.svn" ]; then

	# We are an svn checkout

	if svnversion "$SRC_DIR" | grep 'M' > /dev/null; then

		MODIFIED="2"

	fi

	# Find the revision like: rXXXXM-branch

	BRANCH=`LC_ALL=C svn info "$SRC_DIR" | "$AWK" '/^URL:.*branches/ { split($2, a, "/"); for(i in a) if (a[i]=="branches") { print a[i+1]; break } }'`

	REV_NR=`LC_ALL=C svn info "$SRC_DIR" | "$AWK" '/^Last Changed Rev:/ { print $4 }'`

elif [ -d "$ROOT_DIR/.git" ]; then

	# We are a git checkout

	if git diff-index HEAD "$SRC_DIR" | read dummy; then

		MODIFIED="2"

	fi

	HASH=`LC_ALL=C git rev-parse --verify HEAD 2>/dev/null | cut -c1-8`

	REV="g$HASH"

	BRANCH=`git branch|grep '[*]' | sed 's/\* //;s/^master$//'`

	REV_NR=`LC_ALL=C git log --pretty=format:%s "$SRC_DIR" | grep "^(svn r[0-9]*)" | head -n 1 | sed "s/.*(svn r\([0-9]*\)).*/\1/"`

elif [ -d "$ROOT_DIR/.hg" ]; then

	# We are a hg checkout

	if hg status "$SRC_DIR" | grep -v '^?' | read dummy; then

else

	# We don't know

	MODIFIED="1"

	BRANCH=""

	REV=""

	REV_NR=""

fi

if [ "$MODIFIED" -eq "2" ]; then

	REV="${REV}M"

fi

if [ -n "$BRANCH" ]; then

	REV="${REV}-$BRANCH"

fi