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#!/bin/sh

LANG=C
export LANG
LC_TIME=C
export LC_TIME

# --- GIT -----------------------------------------------------------------------

found_git_dir()
{
    work_dir=$1
    while [ -n "$work_dir" -a "$work_dir" != "/" ]; do
        [ -d "${work_dir}/.git" ] && {
            echo "${work_dir}/.git/"
            return
        }
        work_dir=`dirname "$work_dir"`
    done
    echo ''
}

changesetfs_list_git()
{
    WORK_DIR=$1; shift
    fname=$1; shift
    USER=$1; shift
    DATE=$1; shift

    GIT_DIR=`found_git_dir "$WORK_DIR"`
    [ -z "$GIT_DIR" ] && GIT_DIR=$WORK_DIR
    curr_year=`date +"%Y"`

    git --git-dir="$GIT_DIR" log --abbrev=7 --pretty="format:%at %h %an" -- "$fname" | while read TIMESTAMP chset author
    do
        year=`date -d @"$TIMESTAMP" +"%Y"`
        [ "$year" = "$curr_year" ] && {
            DATE=`date -d @"$TIMESTAMP" +"%b %d %H:%M"`
        } || {
            DATE=`date -d @"$TIMESTAMP" +"%b %d %Y"`
        }
        NAME="$chset $author"
        echo "-rw-rw-rw-   1 $USER    0 0 $DATE  $NAME `basename $fname`"
    done
}

changesetfs_copyout_git()
{
    WORK_DIR=$1; shift
    fname=$1; shift
    orig_fname=$1;shift
    output_fname=$1;shift

    chset=`echo "$orig_fname"| cut -f 1 -d " "`

    GIT_DIR=`found_git_dir "$WORK_DIR"`
    [ -z "$GIT_DIR" ] && GIT_DIR=$WORK_DIR

    filecommit=`git  --git-dir="$GIT_DIR" show --raw --pretty=tformat:%h "$chset" -- "$fname"| \
        tail -n1 | \
        sed 's@^::[0-9]*\s*[0-9]*\s*[0-9]*\s*@@' | \
        sed 's@^:[0-9]*\s*[0-9]*\s*@@' | \
        cut -d'.' -f 1`
    git  --git-dir="$GIT_DIR" show "$filecommit" > "$output_fname"
}

# --- COMMON --------------------------------------------------------------------

changesetfs_list()
{
    VCS_type=$1; shift
    WORK_DIR=$1; shift
    fname=$1; shift

    DATE=`date +"%b %d %H:%M"`
    USER=`whoami`

    case "$VCS_type" in
        git) changesetfs_list_git "$WORK_DIR" "$fname" "$USER" "$DATE" ;;
    esac
}

changesetfs_copyout()
{
    VCS_type=$1; shift
    WORK_DIR=$1; shift
    fname=$1; shift

    case "$VCS_type" in
        git) changesetfs_copyout_git "$WORK_DIR" "$fname" "$@" ;;
    esac

}

# --- MAIN ----------------------------------------------------------------------

command=$1; shift
tmp_file=$1; shift

WORK_DIR=`head -n1 $tmp_file`
fname=`tail -n2 $tmp_file | head -n1`
VCS_type=`tail -n1 $tmp_file`

case "$command" in
  list) changesetfs_list "$VCS_type" "$WORK_DIR" "$fname" ;;
  copyout) changesetfs_copyout "$VCS_type" "$WORK_DIR" "$fname" "$@" ;;
  *) exit 1 ;;
esac
exit 0