zsh: functions: fix upload()

this can be used to watch a file for changes and execute the
given action on changes.

functions/misc.zsh

@@ -121,14 +121,14 @@ function upload
     echo -e "Done, file at:\t$out"
     if [[ $(uname) == "Darwin" ]]; then
         clipboard="pbcopy"
-    elif command -v wl-copy; then
+    elif command -v wl-copy &>/dev/null; then
         clipboard="wl-copy"
-    elif command -v xclip; then
+    elif command -v xclip &>/dev/null ; then
         clipboard="xclip"
     else
         clipboard="cat"
     fi
-    echo -n"$out" | $clipboard
+    echo -en "$out" | $clipboard
 }
 
 ## If connecting through ssh and reverse forwarding port 2222 (ssh -R 2222:localhost:22 ), this function allows to copy the files back to the machine one is connecting from by typing 'mecp filename' (configure the username for "localhost" in ~/.ssh/config or add an username)
@@ -284,3 +284,19 @@ function mangrep() {
 
     MANPAGER="less -p \"$pattern\"" man "$cmd"
 }
+
+
+# watches the given file and executes the given action whenever the file is changed. Usage: watch_file <file> <command>
+function watch_file() {
+  if ! which inotifywait &>/dev/null ; then echo "$0 requires inotifywait"; return 1; fi
+  [[ -z "$1" ]] && "Usage: $0 <file> <action>" && return 1
+  local file
+  file="$1"
+  shift
+
+  [[ -z "$@" ]] && "Usage: $0 <file> <action>" && return 1
+
+  local action
+  action="$@"
+  while inotifywait -e close_write "$file"; do zsh -c "$action"; done
+}