legit-add

#!/bin/dash
export PATH=$PATH:.
# usage error
if [ $# -lt 1 ]
then
    echo "usage: legit-add <filenames>"
    exit
fi   

# no directory error
if [ ! -d ".legit" ]
then 
    echo "legit-add: error: no .legit directory containing legit repository exists"
    exit
fi
    
# no file error
files="$@"
for file in $files;
do
    if [ ! -f "$file" -a ! -f ".legit/copy/$file" ]
    then
        echo "legit-add: error: can not open '$file'"
        exit 
    fi
done

# copying of files
files="$@"
for file in $files;
do
    valid=`echo $file | egrep ^[a-zA-Z0-9][A-Za-z0-9\._-]*$`
    
    if [ "$file" = "$valid" ]
    then
        if [ ! -f ".legit/copy/$file" ]
        then 
            cp $file .legit/copy
        fi
        
        if [ ! -f "$file" ]
        then 
            cp .legit/copy/$file .legit/index
            mv .legit/index/$file .legit/index/$file. # renames deleted files
        else
            cp $file .legit/index
        fi 
    else
        echo "legit-add: error: invalid filename '$file'"
    exit
    fi
done