Add the transfer from transfer.io plugin

plugins/transfer/transfer.plugin.zsh

@@ -0,0 +1,22 @@
+transfer() {
+    if [ $# -eq 0 ]; then
+              echo "No arguments specified. Usage:"
+              echo "transfer /tmp/test.md"
+              echo "cat /tmp/test.md | transfer test.md"
+              return 1
+    fi
+ 
+    # write to output to tmpfile because of progress bar
+    tmpfile=$( mktemp -t transferXXX );
+ 
+    if tty -s; then
+        basefile=$(basename "$1" | sed -e 's/[^a-zA-Z0-9._-]/-/g');
+        curl --progress-bar --upload-file "$1" "https://transfer.sh/$basefile" >> $tmpfile;
+    else
+        curl --progress-bar --upload-file "-" "https://transfer.sh/$1"
+    fi
+ 
+    cat $tmpfile; rm -f $tmpfile;
+}
+ 
+alias transfer=transfer