git-case-common

# common file for git-case

set -e

PROGRAM=$(basename $0)

# ------------------------------------------------------------------------
# helpers

function die() {
        echo "$@" >&2
        exit 1
}

# ------------------------------------------------------------------------
# make sure the user has a sane environment

if test -z "$GIT_COMMITTER_NAME" ; then
	export GIT_COMMITTER_NAME=$(git config --get user.name)
fi
if test -z "$GIT_COMMITTER_EMAIL" ; then
	export GIT_COMMITTER_EMAIL=$(git config --get user.email)
fi

test -z "$GIT_COMMITTER_NAME" \
  -o -z "$GIT_COMMITTER_EMAIL" \
&& die "please set GIT_COMMITTER_NAME and GIT_COMMITTER_EMAIL"

LOCAL_GIT_VERSION=$(git version)
LOCAL_GIT_VERSION=${LOCAL_GIT_VERSION##* }

# we expect 1.5.3 or better
echo "${LOCAL_GIT_VERSION}" | tr '.' ' ' \
| ( read major minor patch rest ; \
    test "$major" -gt 1 -o "$minor" -gt 5 -o "$patch" -ge 3 ) \
    || die "we need git 1.5.5 or better"

if ! ( echo $HOSTNAME | grep -q '.\..' ) ; then
	export HOSTNAME=$(hostname --fqdn)
fi
echo $HOSTNAME | grep -q '.\..' \
|| die "HOSTNAME '$HOSTNAME' is not a fully qualified comain name"


# ------------------------------------------------------------------------
# find the .git dir

GIT_DIR=$(git rev-parse --git-dir)
if test "${GIT_DIR:0:1}" != / ; then
        GIT_DIR="$(pwd)/$GIT_DIR"
fi
export GIT_DIR

# ------------------------------------------------------------------------
# define locations of case tracking bits

export GIT_CASE_HEAD="cases"

export GIT_CASE_DIR="$GIT_DIR/case"
export GIT_CASE_WORK_DIR="$GIT_CASE_DIR/tmp-$$"
export GIT_CASE_ACTIVE="$GIT_CASE_DIR/active"

export GIT_CASE_INDEX="$GIT_CASE_WORK_DIR/index"

# ------------------------------------------------------------------------
# prepare the redirection

export GIT_INDEX_FILE="$GIT_CASE_INDEX"

# ------------------------------------------------------------------------
# colours are pretty

black='\E[30;40m'
red='\E[31;40m'
green='\E[32;40m'
yellow='\E[33;40m'
blue='\E[34;40m'
magenta='\E[35;40m'
cyan='\E[36;40m'
white='\E[37;40m'

reset='\e[m'
bold='\e[1m'
underline='\e[4m'
blink='\e[5m'
inverse='\e[7m'

# ------------------------------------------------------------------------
# helper functions

function go_to_git_case_work_dir() {
        test -d "$GIT_CASE_WORK_DIR" && die "stale $GIT_CASE_WORK_DIR already exists"
        trap "cd $GIT_DIR ; rm -rf $GIT_CASE_WORK_DIR; exit" INT TERM EXIT
        mkdir -p "$GIT_CASE_WORK_DIR"
        cd "$GIT_CASE_WORK_DIR"
}

function generate_case_id() {
	local description=$1

	local date=$(date +%Y%m%d-%H%M%S.%N)
	local salt="Commiter: $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL>
Date: $date
Description: $description"

	local sha1=$(echo "$salt" | git hash-object --stdin)

	test -z "$(git ls-tree "$GIT_CASE_HEAD" -- "$sha1" 2>/dev/null)" \
	|| die "holly crap, there is a collision on $sha1"

	echo "$sha1"
}

function add_file_to_index() {
	local FILE_NAME=$1
	local CONTENTS=$2		# optional

	local FILE_ID=$(
                if [ "${#@}" = 2 ];
                then
                        echo "$CONTENTS"
                else
                        cat
                fi | git hash-object -t blob -w --stdin)

	git update-index --add --cacheinfo 100644 "$FILE_ID" "$FILE_NAME"
}

function commit_index_and_update_branch() {
        local DESCRIPTION=$1
        local COMMIT_PARENT_ARGS=$2

        local TREE=$(git write-tree)
        test -z "$TREE" && die "failed to write tree"

        local COMMIT=$(echo "$DESCRIPTION" | git commit-tree ${TREE} ${COMMIT_PARENT_ARGS})
        test -z "$COMMIT" && die "failed to create commit"

	git-update-ref "refs/heads/$GIT_CASE_HEAD" "$COMMIT"
}

function gen_short_case_id() {
	local long=$1

	echo "${long:0:6}"
}

function print_pretty_comment() {
        local file=$1
        local object=$2

        local short=${file##*/}
        echo -e "  * $bold$black""$short""$reset"
        git cat-file blob $object \
	| ( while read line ; do
	    test -z "$line" && break
	    name=${line%%:*}
	    value=${line##*: }
	    echo -e "$bold$black""$name: $reset""$value"
	    done
	    echo ; cat ) \
	| sed 's/^/      /'
        echo
}


# vim: set ft=sh ts=8 noet sw=8 tw=72