git-export

#!/bin/bash
# TODO add archive
# TODO filter D files
# TODO remove -w flag move to end of options

# Init
VERBOSE=false
ERROR=false
RECORD=false
RETRIEVE=false

while getopts ":w:o:cld:zvrR" flag
do
    case $flag in
    o)  # exported to 
        DEST_ROOT=$OPTARG
        [ ! $(echo $DEST_ROOT | grep '^/') ] && DEST_ROOT=$PWD/$DEST_ROOT
        [ ! $(echo $DEST_ROOT | grep '/$') ] && DEST_ROOT=$DEST_ROOT/
    ;;
    w)
        WORKPATH=$OPTARG
    ;;
    c) # export and compress these files in tar formmat
        COMPRESS=true
    ;;
    l) # only list these file names
        LIST=true
    ;;
    z) # zip formmat compress exported files
        ZIP=true
    ;;
    d) # 
        DIFF=$OPTARG 
    ;;
    v) # verbose
        VERBOSE=true
    ;;
    r)
        RECORD=true
    ;;
    R)
        RECORD=true
        RETRIEVE=true
    ;;
    *)
        ERROR=true
    ;;
    esac
done

[ -z "$WORKPATH" ] && ERROR=true

if $ERROR; then 
    echo "usage: git-export [-w GIT_WORKSPACE] -lvc [-o EXPORT_TO] [-d GIT_DIFF_COMMIT_HASH]"
    echo '-l   List files which are going to be exported.'
    echo '-v   Cause to be verbose, showing files after they are exported.'
    echo '-c   Compress exported files into tar formmat.[not implemented yet]'
    echo '-z   Compress exported files into zip formmat.[not implemented yet]'
    echo '-r   Record last commit id to the file .git-export located in the root of workpath.'
    echo '-R   Diff from last commit id recorded in .git-export file.'
    exit 8
fi

[ -z "$DEST_ROOT" ] && DEST_ROOT=$PWD/

# CD to root of workpath
cd $WORKPATH
WORKPATH=`git rev-parse --show-cdup`
if [ -n "$WORKPATH" ]; then
    cd $WORKPATH
fi

if $RETRIEVE ;then
    if [ -e ".git-export" ]; then
        DIFF=`cat .git-export`
    fi
fi

if [ -z "$DIFF" ]; then
    GIT_LIST=`git diff --name-status`
else 
    GIT_LIST=`git diff --name-status $DIFF`
fi

for f in $GIT_LIST; do
    [ $(echo $f | grep '^[M|A|D|R|C|U]$') ] && continue
    p=$PWD/$f
    if ${LIST:=false}; then
        echo $p
    else
        if [ $(echo $f | grep '/') ]; then
            DEST_DIR=$DEST_ROOT${f%/*}
            [ ! -d $DEST_DIR ] && mkdir -p $DEST_DIR
            cp $p $DEST_DIR
        else
            cp $p $DEST_ROOT
        fi
        [ $VERBOSE = true ] && echo $DEST_ROOT$f
    fi
done


if $RECORD; then
    LAST_COMMIT_ID=`git log --pretty=oneline -n1`
    if [ -n "$LAST_COMMIT_ID" ]; then
        LAST_COMMIT_ID=${LAST_COMMIT_ID:0:20}
        echo $LAST_COMMIT_ID > .git-export
    fi
fi