#!/bin/bash

# sftpsync--Given a target directory on an sftp server, makes sure that 
#   all new or modified files are uploaded to the remote system. Uses
#   a timestamp file ingeniously called .timestamp to keep track.

setglobal timestamp = '".timestamp'"
setglobal tempfile = ""/tmp/sftpsync.$Pid""
setglobal count = '0'

trap "$[which rm] -f $tempfile" 0 1 15      # Zap tempfile on exit

if test $Argc -eq 0  {
  echo "Usage: $0 user@host { remotedir }" > !2
  exit 1
}

setglobal user = $[echo $1 | cut -d@ -f1]
setglobal server = $[echo $1 | cut -d@ -f2]

if test $Argc -gt 1  {
  echo "cd $2" >> $tempfile
}

if test ! -f $timestamp  {
  # If no timestamp file, upload all files.
  for filename in [*]
  { 
    if test -f $filename  {
      echo "put -P \"$filename\"" >> $tempfile
      setglobal count = $shExpr(' $count + 1 ')
    }
  }
} else {
  for filename in [$[find . -newer $timestamp -type f -print]]
  { 
    echo "put -P \"$filename\"" >> $tempfile
    setglobal count = $shExpr(' $count + 1 ')
  }
}

if test $count -eq 0  {
  echo "$0: No files require uploading to $server" > !2
  exit 1
}

echo "quit" >> $tempfile

echo "Synchronizing: Found $count files in local folder to upload."

if ! sftp -b $tempfile "$user@$server"  {
  echo "Done. All files synchronized up with $server"
  touch $timestamp
}
exit 0