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#!/bin/sh

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# Arguments given? Show help text.

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

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	cat <<EOF

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Usage: ./findversion.sh

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Finds the current revision and if the code is modified.

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Output: <REV>\t<REV_NR>\t<MODIFIED>

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REV

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

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

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

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

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    This also includes an indication of whether the checkout was

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

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

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    revision and user display.

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

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REV_NR

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    the revision number of the svn revision this checkout is based on.

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    This can be used to determine which functionality is present in this

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    checkout. For trunk svn checkouts and hg/git branches based upon it,

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    this number should be accurate. For svn branch checkouts, this

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    number is mostly meaningless, at least when comparing with the

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    REV_NR from other branches or trunk.

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    This number should be sortable. Within a given branch or trunk, a

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    higher number means a newer version. However, when using git or hg,

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    this number will not increase on new commits.

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

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MODIFIED

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

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

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    Modification is determined in relation to the commit identified by

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

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

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

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

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

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"awk".

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EOF

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exit 1;

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fi

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# Allow awk to be provided by the caller.

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if [ -z "$AWK" ]; then

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	AWK=awk

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fi

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# Find out some dirs

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cd `dirname "$0"`

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ROOT_DIR=`pwd`

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SRC_DIR=src

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# Determine if we are using a modified version

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# Assume the dir is not modified

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MODIFIED="0"

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

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	# We are an svn checkout

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

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		MODIFIED="2"

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	fi

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	# Find the revision like: rXXXXM-branch

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	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 } }'`

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

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	REV="r$REV_NR"

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

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	# We are a git checkout

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

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		MODIFIED="2"

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	fi

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

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	REV="g$HASH"

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

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	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/"`

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

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	# We are a hg checkout

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

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		MODIFIED="2"

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	fi

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	HASH=`LC_ALL=C hg tip 2>/dev/null | head -n 1 | cut -d: -f3 | cut -c1-8`

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	REV="h$HASH"

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	BRANCH=`hg branch | sed 's/^default$//'`

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	REV_NR=`LC_ALL=C hg log -k "svn" -l 1 --template "{desc}\n" "$SRC_DIR" | grep "^(svn r[0-9]*)" | head -n 1 | sed "s/.*(svn r\([0-9]*\)).*/\1/"`

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else

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	# We don't know

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	MODIFIED="1"

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	BRANCH=""

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	REV=""

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	REV_NR=""

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fi

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

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	REV="${REV}M"

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fi

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if [ -n "$BRANCH" ]; then

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	REV="${REV}-$BRANCH"

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fi

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echo -e "$REV\t$REV_NR\t$MODIFIED"