Made Arduino IDE scroll during upload

When esptool is run from the Arduino IDE, the output window doesn't
scroll because of the \rs used to make the console update status on a
single line.

To avoid this, don't attempt to output everything on a single line when
scripted (i.e. not running on a TTY) by replacing \r with \n.

See esp8266/Arduino#6765 for some discussion.

Author: earlephilhower

esptool.py

@@ -75,6 +75,10 @@
 MEM_END_ROM_TIMEOUT = 0.05            # special short timeout for ESP_MEM_END, as it may never respond
 DEFAULT_SERIAL_WRITE_TIMEOUT = 10     # timeout for serial port write
 
+if sys.stdout.isatty():
+    CR = '\r'
+else:
+    CR = '\n'
 
 def timeout_per_mb(seconds_per_mb, size_bytes):
     """ Scales timeouts which are size-specific """
@@ -2365,8 +2369,8 @@ def dump_mem(esp, args):
             d = esp.read_reg(args.address + (i * 4))
             f.write(struct.pack(b'<I', d))
             if f.tell() % 1024 == 0:
-                print('\r%d bytes read... (%d %%)' % (f.tell(),
-                                                      f.tell() * 100 // args.size),
+                print(CR +'%d bytes read... (%d %%)' % (f.tell(),
+                                                        f.tell() * 100 // args.size),
                       end=' ')
             sys.stdout.flush()
     print('Done!')
@@ -2503,7 +2507,7 @@ def write_flash(esp, args):
         written = 0
         t = time.time()
         while len(image) > 0:
-            print('\rWriting at 0x%08x... (%d %%)' % (address + seq * esp.FLASH_WRITE_SIZE, 100 * (seq + 1) // blocks), end='')
+            print(CR + 'Writing at 0x%08x... (%d %%)' % (address + seq * esp.FLASH_WRITE_SIZE, 100 * (seq + 1) // blocks), end='')
             sys.stdout.flush()
             block = image[0:esp.FLASH_WRITE_SIZE]
             if args.compress:
@@ -2523,11 +2527,11 @@ def write_flash(esp, args):
         if args.compress:
             if t > 0.0:
                 speed_msg = " (effective %.1f kbit/s)" % (uncsize / t * 8 / 1000)
-            print('\rWrote %d bytes (%d compressed) at 0x%08x in %.1f seconds%s...' % (uncsize, written, address, t, speed_msg))
+            print(CR + 'Wrote %d bytes (%d compressed) at 0x%08x in %.1f seconds%s...' % (uncsize, written, address, t, speed_msg))
         else:
             if t > 0.0:
                 speed_msg = " (%.1f kbit/s)" % (written / t * 8 / 1000)
-            print('\rWrote %d bytes at 0x%08x in %.1f seconds%s...' % (written, address, t, speed_msg))
+            print(CR + 'Wrote %d bytes at 0x%08x in %.1f seconds%s...' % (written, address, t, speed_msg))
 
         if not args.encrypt:
             try:
@@ -2690,7 +2694,7 @@ def flash_progress(progress, length):
     t = time.time()
     data = esp.read_flash(args.address, args.size, flash_progress)
     t = time.time() - t
-    print('\rRead %d bytes at 0x%x in %.1f seconds (%.1f kbit/s)...'
+    print(CR + 'Read %d bytes at 0x%x in %.1f seconds (%.1f kbit/s)...'
           % (len(data), args.address, t, len(data) / t * 8 / 1000))
     with open(args.filename, 'wb') as f:
         f.write(data)