respond: No forced spaces (#5152)

Signed-off-by: Adrian Joachim <adi.joachim12@gmail.com>

docs/G-Codes.md

@@ -1010,6 +1010,8 @@ The following additional commands are also available.
   configured default prefix (or `echo: ` if no prefix is configured).
 - `RESPOND TYPE=echo MSG="<message>"`: echo the message prepended with
   `echo: `.
+- `RESPOND TYPE=echo_no_space MSG="<message>"`: echo the message prepended with
+  `echo:` without a space between prefix and message, helpful for compatibility with some octoprint plugins that expect very specific formatting.
 - `RESPOND TYPE=command MSG="<message>"`: echo the message prepended
   with `// `.  OctoPrint can be configured to respond to these messages
   (e.g.  `RESPOND TYPE=command MSG=action:pause`).

klippy/extras/respond.py

@@ -10,6 +10,10 @@ respond_types = {
     'error' : '!!',
 }
 
+respond_types_no_space = {
+    'echo_no_space': 'echo:',
+}
+
 class HostResponder:
     def __init__(self, config):
         self.printer = config.get_printer()
@@ -26,19 +30,26 @@ class HostResponder:
         gcmd.respond_raw("%s %s" % (self.default_prefix, msg))
     cmd_RESPOND_help = ("Echo the message prepended with a prefix")
     def cmd_RESPOND(self, gcmd):
+        no_space = False
         respond_type = gcmd.get('TYPE', None)
         prefix = self.default_prefix
         if(respond_type != None):
             respond_type = respond_type.lower()
             if(respond_type in respond_types):
                 prefix = respond_types[respond_type]
+            elif(respond_type in respond_types_no_space):
+                prefix = respond_types_no_space[respond_type]
+                no_space = True
             else:
                 raise gcmd.error(
                     "RESPOND TYPE '%s' is invalid. Must be one"
                     " of 'echo', 'command', or 'error'" % (respond_type,))
         prefix = gcmd.get('PREFIX', prefix)
         msg = gcmd.get('MSG', '')
-        gcmd.respond_raw("%s %s" % (prefix, msg))
+        if(no_space):
+            gcmd.respond_raw("%s%s" % (prefix, msg))
+        else:
+            gcmd.respond_raw("%s %s" % (prefix, msg))
 
 def load_config(config):
     return HostResponder(config)