MIKE_VERSION_GEN

#!/usr/bin/env bash

# path
MIKE_VERSION_GEN_REALPATH=$(realpath $0)
MIKE_PATH=$(dirname $MIKE_VERSION_GEN_REALPATH)

# include mike.sh
source "$MIKE_PATH/lib/mike.sh"

# Mike info
MIKE_GIT_URL="sylvain@git.abstraction.fr:~/priv/git/mike.git"
MIKE_WHO=$(whoami)@$(hostname)

# default values
MIKE_VERSION_FILE="$MIKE_PATH/MIKE_VERSION_FILE"
MIKE_HEAD_DIFF_FILE="$MIKE_PATH/MIKE_HEAD_DIFF_FILE"
MIKE_TAG_DIFF_FILE="$MIKE_PATH/MIKE_TAG_DIFF_FILE"

# MIKE_VERSION_FILE
if [ ! -z "$1" ]; then
    MIKE_VERSION_FILE=$1;
fi

# MIKE_COMMIT_DIFF_FILE
if [ ! -z "$2" ]; then
    MIKE_HEAD_DIFF_FILE=$2
fi

# MIKE_TAG_DIFF_FILE
if [ ! -z "$3" ]; then
    MIKE_TAG_DIFF_FILE=$3
fi

# if git repository
if [ -d "$MIKE_PATH/.git" ]; then
    # exporting git dit
    GIT_DIR="$MIKE_PATH/.git"
    GIT_WORK_TREE="$MIKE_PATH"
    export GIT_DIR GIT_WORK_TREE

    MIKE_COMMIT=$(git rev-parse HEAD)
    MIKE_COMMIT_DATE=$(git log --pretty=format:"%ci" -1)
    MIKE_BRANCH=$(git symbolic-ref -q HEAD | sed -e 's#refs/heads/##')

    if [ -z "$MIKE_BRANCH" ]; then
        for branch in $(git branch --contains HEAD | grep -v '(no branch)' | cut -b '3-'); do
            MIKE_BRANCH=$(echo -n "$MIKE_BRANCH $branch" | sed -e 's#^ ##g')
        done
    fi

    # generating MIKE_VERSION
    if [ ! -z "$(git describe --match "v[0-9]*.[0-9]*.[0-9]*" --dirty 2>/dev/null)" ]; then
        MIKE_VERSION=$(git describe --match "v[0-9]*.[0-9]*.[0-9]*" --dirty --abbrev 2>/dev/null)
        MIKE_LAST_TAG=$(git describe --match "v[0-9]*.[0-9]*.[0-9]*" --no-abbrev 2>/dev/null)

        if [ ! -z "$(git diff --name-only $MIKE_LAST_TAG HEAD --)" ]; then
            git diff --patience --no-color $MIKE_LAST_TAG HEAD -- > $MIKE_TAG_DIFF_FILE
        else
            rm -f $MIKE_TAG_DIFF_FILE
        fi
    fi

    # generating MIKE_HEAD_DIFF_FILE
    if [ ! -z "$(git diff-index --name-only HEAD --)" ]; then
        MIKE_COMMIT="$MIKE_COMMIT-dirty";
        git diff --patience --no-color HEAD -- > $MIKE_HEAD_DIFF_FILE
    else
        rm -f $MIKE_HEAD_DIFF_FILE
    fi

    # removing for safety
    rm -f $MIKE_VERSION_FILE
else
    if [ ! -f "$MIKE_VERSION_FILE" ]; then
        die "not in a git repository and $MIKE_VERSION_FILE not here.\n" \
            "You messed up something"
    fi

    exit 0
fi

# writing MIKE_VERSION_FILE
echo "MIKE_GIT_URL=$MIKE_GIT_URL" >> $MIKE_VERSION_FILE
echo "MIKE_VERSION=$MIKE_VERSION" >> $MIKE_VERSION_FILE
echo "MIKE_COMMIT=$MIKE_COMMIT" >> $MIKE_VERSION_FILE
echo "MIKE_COMMIT_DATE=$MIKE_COMMIT_DATE" >> $MIKE_VERSION_FILE
echo "MIKE_BRANCH=$MIKE_BRANCH" >> $MIKE_VERSION_FILE
echo 'MIKE_WHO_INSTALLED=$(shell whoami)@$(shell hostname)' >> $MIKE_VERSION_FILE

exit 0