WIP: rename Fig to Compose

Signed-off-by: Aanand Prasad <aanand.prasad@gmail.com>

compose/progress_stream.py

@@ -0,0 +1,85 @@
+import json
+import os
+import codecs
+
+
+class StreamOutputError(Exception):
+    pass
+
+
+def stream_output(output, stream):
+    is_terminal = hasattr(stream, 'fileno') and os.isatty(stream.fileno())
+    stream = codecs.getwriter('utf-8')(stream)
+    all_events = []
+    lines = {}
+    diff = 0
+
+    for chunk in output:
+        event = json.loads(chunk)
+        all_events.append(event)
+
+        if 'progress' in event or 'progressDetail' in event:
+            image_id = event.get('id')
+            if not image_id:
+                continue
+
+            if image_id in lines:
+                diff = len(lines) - lines[image_id]
+            else:
+                lines[image_id] = len(lines)
+                stream.write("\n")
+                diff = 0
+
+            if is_terminal:
+                # move cursor up `diff` rows
+                stream.write("%c[%dA" % (27, diff))
+
+        print_output_event(event, stream, is_terminal)
+
+        if 'id' in event and is_terminal:
+            # move cursor back down
+            stream.write("%c[%dB" % (27, diff))
+
+        stream.flush()
+
+    return all_events
+
+
+def print_output_event(event, stream, is_terminal):
+    if 'errorDetail' in event:
+        raise StreamOutputError(event['errorDetail']['message'])
+
+    terminator = ''
+
+    if is_terminal and 'stream' not in event:
+        # erase current line
+        stream.write("%c[2K\r" % 27)
+        terminator = "\r"
+        pass
+    elif 'progressDetail' in event:
+        return
+
+    if 'time' in event:
+        stream.write("[%s] " % event['time'])
+
+    if 'id' in event:
+        stream.write("%s: " % event['id'])
+
+    if 'from' in event:
+        stream.write("(from %s) " % event['from'])
+
+    status = event.get('status', '')
+
+    if 'progress' in event:
+        stream.write("%s %s%s" % (status, event['progress'], terminator))
+    elif 'progressDetail' in event:
+        detail = event['progressDetail']
+        if 'current' in detail:
+            percentage = float(detail['current']) / float(detail['total']) * 100
+            stream.write('%s (%.1f%%)%s' % (status, percentage, terminator))
+        else:
+            stream.write('%s%s' % (status, terminator))
+    elif 'stream' in event:
+        stream.write("%s%s" % (event['stream'], terminator))
+    else:
+        stream.write("%s%s\n" % (status, terminator))