girt-add

#!/bin/dash


# test if the repo does not exist
if ! test -d ".girt"
then
    echo "$0: error: girt repository directory .girt not found" 1>&2
    exit 1
fi

# test if no filename is provided
if test "$#" -eq 0
then
    echo "usage: $0 <filenames>" 1>&2
    exit 1
fi


# going through filenames in command line arguments
for file_names in "$@"
do
    # storing filenames with incorrect format
    wrong_format=$(echo "$file_names" | grep -E '^[^a-zA-Z0-9]')

    # if the file does not exit in cwd
    if ! test -e $file_names
    then
        if test "$wrong_format" != ""
        then
            echo "$0: error: invalid filename '$file_names'" 1>&2
            exit 1

        # if the file is not stored in index, can not open file and exit
        elif ! test -e ".girt/index/$file_names"
        then
            echo "$0: error: can not open '$file_names'" 1>&2
            exit 1
        
        # if the file is stored in the index, remove it from index and continue
        else
            rm ".girt/index/$file_names"
            continue
        fi

    # if the file exists in cwd
    else

        # if the format is wrong, output invalid file name and exit
        if test "$wrong_format" != ""
        then
            echo "$0: error: invalid filename '$file_names'" 1>&2
            exit 1

        # if the file is stored in index, replace it
        elif test -e ".girt/index/$file_names"
        then
            cp "$file_names" ".girt/index/$file_names"
            continue
                
        # if the file is not stored in index, copy it in index and continue
        else
            cp "$file_names" ".girt/index/$file_names"
            continue
        fi
    fi

done