Fix #1599 by relaxing the match_trigger regex (#1601)

* Fix #1599 by relaxing the `match_trigger` regex

Also simplify logic and reduce duplication.

* restrict trigger regex again (but not so far)

ldm/invoke/CLI.py

@@ -308,7 +308,7 @@ def main_loop(gen, opt):
                     if use_prefix is not None:
                         prefix = use_prefix
                     postprocessed = upscaled if upscaled else operation=='postprocess'
-                    opt.prompt = triggers_to_concepts(gen, opt.prompt)  # to avoid the problem of non-unique concept triggers
+                    opt.prompt = gen.concept_lib().replace_triggers_with_concepts(opt.prompt)  # to avoid the problem of non-unique concept triggers
                     filename, formatted_dream_prompt = prepare_image_metadata(
                         opt,
                         prefix,
@@ -353,7 +353,7 @@ def main_loop(gen, opt):
 
             if operation == 'generate':
                 # load any <embeddings> from the SD concepts library
-                opt.prompt = concepts_to_triggers(gen, opt.prompt)
+                opt.prompt = gen.concept_lib().replace_concepts_with_triggers(opt.prompt, lambda concepts: gen.load_concepts(concepts))
                 catch_ctrl_c = infile is None # if running interactively, we catch keyboard interrupts
                 opt.last_operation='generate'
                 try:
@@ -503,19 +503,6 @@ def do_command(command:str, gen, opt:Args, completer) -> tuple:
         command = '-h'
     return command, operation
 
-def concepts_to_triggers(gen, prompt:str)->str:
-    concepts = re.findall('<([^>]+)>',prompt)
-    if not concepts:
-        return prompt
-    gen.load_concepts(concepts)
-    return gen.concept_lib().replace_concepts_with_triggers(prompt)
-
-def triggers_to_concepts(gen,prompt:str)->str:
-    concepts = re.findall('<([^>]+)>',prompt)
-    if not concepts:
-        return prompt
-    return gen.concept_lib().replace_triggers_with_concepts(prompt)
-        
 def set_default_output_dir(opt:Args, completer:Completer):
     '''
     If opt.outdir is relative, we add the root directory to it

ldm/invoke/concepts_lib.py

@@ -7,6 +7,7 @@ The interface is through the Concepts() object.
 import os
 import re
 import traceback
+from typing import Callable
 from urllib import request, error as ul_error
 from huggingface_hub import HfFolder, hf_hub_url, ModelSearchArguments, ModelFilter, HfApi
 from ldm.invoke.globals import Globals
@@ -22,8 +23,8 @@ class Concepts(object):
         self.concepts_loaded = dict()
         self.triggers = dict()            # concept name to trigger phrase
         self.concept_names = dict()       # trigger phrase to concept name
-        self.match_trigger = re.compile('(<[\w\-]+>)')
-        self.match_concept = re.compile('<([\w\-]+)>')
+        self.match_trigger = re.compile('(<[\w\- >]+>)') # trigger is slightly less restrictive than HF concept name
+        self.match_concept = re.compile('<([\w\-]+)>') # HF concept name can only contain A-Za-z0-9_-
 
     def list_concepts(self)->list:
         '''
@@ -83,15 +84,27 @@ class Concepts(object):
         better to store the concept name (unique) than the concept trigger
         (not necessarily unique!)
         '''
+        triggers = self.match_trigger.findall(prompt)
+        if not triggers:
+            return prompt
+
         def do_replace(match)->str:
             return self.trigger_to_concept(match.group(1)) or f'<{match.group(1)}>'
         return self.match_trigger.sub(do_replace, prompt)
 
-    def replace_concepts_with_triggers(self, prompt:str)->str:
+    def replace_concepts_with_triggers(self, prompt:str, load_concepts_callback: Callable[[list], any])->str:
         '''
-        Given a prompt string that contains <concept_name> tags, replace
+        Given a prompt string that contains `<concept_name>` tags, replace
         these tags with the appropriate trigger.
+
+        If any `<concept_name>` tags are found, `load_concepts_callback()` is called with a list
+        of `concepts_name` strings.
         '''
+        concepts = self.match_concept.findall(prompt)
+        if not concepts:
+            return prompt
+        load_concepts_callback(concepts)
+
         def do_replace(match)->str:
             return self.concept_to_trigger(match.group(1)) or f'<{match.group(1)}>'
         return self.match_concept.sub(do_replace, prompt)