sve.sh

#!/bin/bash

#sve = System Variable Exemplifier
#This script executes whatever file you tell regardless of in which directory it's currently in.


script_help=$( cat << EOF

This script executes whatever file you tell regardless of
in which directory it's currently in. In order or execution,
it will: receive arg, find out/, get into out and run arg.

Usages:
    #1: $0 <java_executable>
    #2: $0 -c <out_dir|nothing>
Arguments:
    -h,--help       See this help message.
    -c,--compile    Compile all .java files in current dir into
                    current dir or a given dir a a subargument.
Example:
    #1: $0 animals.Duck
    explanation: it will execute the Duck.class that belongs to
    the package animals.

EOF
)

OUT_DICT=out

recurse_dirs() {

files_array=$(find . -type f -name "*.java") #find all files with the .java extension
test_array=()

for j in "${files_array[@]}"; do #this is because files on $files_array can't be accessed one by one
    test_array+=($j)
done

echo -e "\n\t--------Files--------\n"
#note: the emoji is for orientating the user in case the error output is huge
if [[ -z "$out" ]]; then #var is empty, therefore no out dir was given
    for file in "${test_array[@]}"; do
        echo -e "🍉 compiling:\t$file"; `javac $file`
    done
else #var has something, dir was given
    for file in "${test_array[@]}"; do
        echo -e "🍉 compiling:\t$file"; `javac $file -d $out`
    done
fi

echo -e "\n\neverything was compiled successfully!"
}

if [[ -n "$1" ]]; then
    case "$1" in
        -h|--help)
            echo "$script_help"
            exit 0
            ;;
        -c|--compile)
            out=$2
            recurse_dirs
            exit 0
            ;;
        *)
            i=0
            file=$1
            #echo "arg 1 = $1" #works
            #it will try to find out/ 18 times, this so as to avoid overloading the ram
            #trying to find an unexistent out/. Of course this number can be increased

            while [[ $i -le 18 ]]; do
                if [[ -d "$OUT_DICT" ]]; then #out found
                    cd $OUT_DICT
                    java $file
                    break
                else #out not found
                    cd ..
                    i=$((i+1))
                fi
            done
            exit 0
            ;;
    esac
    shift
else
    echo -e "This script needs at least one argument to work.\nType '$0 -h' or '$0 --help' for help "
fi