Improve transfer function to support stdin

[anihm136]

Fixes dutchcoders/transfer.sh#413

Allows transfer function to take input from stdin

[aspacca]

hello @anihm136

sorry for the long time taking to review your PR

$ source .bash_profile
-bash: .bash_profile: line 1: syntax error near unexpected token `('
-bash: .bash_profile: line 1: `transfer() { local file local file_name file="§1" [ -n "§file" ] && file_name=§(basename "§file") || file_name="" if tty -s; then if [ §# -eq 0 ]; then echo "No arguments specified.\nUsage:\n transfer <file|directory>\n ... | transfer <file_name>" >&2 return 1 fi if [ ! -e "§file" ]; then echo "§file: No such file or directory" >&2 return 1 fi if [ -d "§file" ]; then file_name="§file_name.zip" , (cd "§file" && zip -r -q - .) | curl --progress-bar --upload-file "-" "https://transfer.sh/§file_name" | tee /dev/null,         else              cat "§file" | curl --progress-bar --upload-file "-" "https://transfer.sh/§file_name" | tee /dev/null         fi else if [ -z "§file_name" ] && [ ! -t 0 ]; then file_name=§(mktemp -u "tmpXXXXXXXXXX") elif [ -t 0 ]; then echo "No data provided.\nUsage:\n transfer <file|directory>\n ... | transfer <file_name>" >&2 return 1 fi curl --progress-bar --upload-file "-" "https://transfer.sh/§file_name" | tee /dev/null fi }'