Allow use of mutiple styles csv files

* https://github.com/AUTOMATIC1111/stable-diffusion-webui/issues/14122
Fix edge case where style text has multiple {prompt} placeholders
* https://github.com/AUTOMATIC1111/stable-diffusion-webui/issues/14005

modules/styles.py

 import csv
+import fnmatch
 import os
 import os.path
 import re
@@ -10,6 +11,23 @@ class PromptStyle(typing.NamedTuple):
     name: str
     prompt: str
     negative_prompt: str
+    path: str = None
+
+
+def clean_text(text: str) -> str:
+    """
+    Iterating through a list of regular expressions and replacement strings, we
+    clean up the prompt and style text to make it easier to match against each
+    other.
+    """
+    re_list = [
+        ("multiple commas", re.compile("(,+\s+)+,?"), ", "),
+        ("multiple spaces", re.compile("\s{2,}"), " "),
+    ]
+    for _, regex, replace in re_list:
+        text = regex.sub(replace, text)
+
+    return text.strip(", ")
 
 
 def merge_prompts(style_prompt: str, prompt: str) -> str:
@@ -26,41 +44,64 @@ def apply_styles_to_prompt(prompt, styles):
     for style in styles:
         prompt = merge_prompts(style, prompt)
 
-    return prompt
+    return clean_text(prompt)
 
 
-re_spaces = re.compile("  +")
+def unwrap_style_text_from_prompt(style_text, prompt):
+    """
+    Checks the prompt to see if the style text is wrapped around it. If so,
+    returns True plus the prompt text without the style text. Otherwise, returns
+    False with the original prompt.
 
-
-def extract_style_text_from_prompt(style_text, prompt):
-    stripped_prompt = re.sub(re_spaces, " ", prompt.strip())
-    stripped_style_text = re.sub(re_spaces, " ", style_text.strip())
+    Note that the "cleaned" version of the style text is only used for matching
+    purposes here. It isn't returned; the original style text is not modified.
+    """
+    stripped_prompt = clean_text(prompt)
+    stripped_style_text = clean_text(style_text)
     if "{prompt}" in stripped_style_text:
-        left, right = stripped_style_text.split("{prompt}", 2)
+        # Work out whether the prompt is wrapped in the style text. If so, we
+        # return True and the "inner" prompt text that isn't part of the style.
+        try:
+            left, right = stripped_style_text.split("{prompt}", 2)
+        except ValueError as e:
+            # If the style text has multple "{prompt}"s, we can't split it into
+            # two parts. This is an error, but we can't do anything about it.
+            print(f"Unable to compare style text to prompt:\n{style_text}")
+            print(f"Error: {e}")
+            return False, prompt
         if stripped_prompt.startswith(left) and stripped_prompt.endswith(right):
-            prompt = stripped_prompt[len(left):len(stripped_prompt)-len(right)]
+            prompt = stripped_prompt[len(left) : len(stripped_prompt) - len(right)]
             return True, prompt
     else:
+        # Work out whether the given prompt ends with the style text. If so, we
+        # return True and the prompt text up to where the style text starts.
         if stripped_prompt.endswith(stripped_style_text):
-            prompt = stripped_prompt[:len(stripped_prompt)-len(stripped_style_text)]
-
-            if prompt.endswith(', '):
+            prompt = stripped_prompt[: len(stripped_prompt) - len(stripped_style_text)]
+            if prompt.endswith(", "):
                 prompt = prompt[:-2]
-
             return True, prompt
 
     return False, prompt
 
 
-def extract_style_from_prompts(style: PromptStyle, prompt, negative_prompt):
+def extract_original_prompts(style: PromptStyle, prompt, negative_prompt):
+    """
+    Takes a style and compares it to the prompt and negative prompt. If the style
+    matches, returns True plus the prompt and negative prompt with the style text
+    removed. Otherwise, returns False with the original prompt and negative prompt.
+    """
     if not style.prompt and not style.negative_prompt:
         return False, prompt, negative_prompt
 
-    match_positive, extracted_positive = extract_style_text_from_prompt(style.prompt, prompt)
+    match_positive, extracted_positive = unwrap_style_text_from_prompt(
+        style.prompt, prompt
+    )
     if not match_positive:
         return False, prompt, negative_prompt
 
-    match_negative, extracted_negative = extract_style_text_from_prompt(style.negative_prompt, negative_prompt)
+    match_negative, extracted_negative = unwrap_style_text_from_prompt(
+        style.negative_prompt, negative_prompt
+    )
     if not match_negative:
         return False, prompt, negative_prompt
 
@@ -69,25 +110,88 @@ def extract_style_from_prompts(style: PromptStyle, prompt, negative_prompt):
 
 class StyleDatabase:
     def __init__(self, path: str):
-        self.no_style = PromptStyle("None", "", "")
+        self.no_style = PromptStyle("None", "", "", None)
         self.styles = {}
         self.path = path
 
+        folder, file = os.path.split(self.path)
+        self.default_file = file.split("*")[0] + ".csv"
+        if self.default_file == ".csv":
+            self.default_file = "styles.csv"
+        self.default_path = os.path.join(folder, self.default_file)
+
+        self.prompt_fields = [field for field in PromptStyle._fields if field != "path"]
+
         self.reload()
 
     def reload(self):
+        """
+        Clears the style database and reloads the styles from the CSV file(s)
+        matching the path used to initialize the database.
+        """
         self.styles.clear()
 
-        if not os.path.exists(self.path):
+        path, filename = os.path.split(self.path)
+
+        if "*" in filename:
+            fileglob = filename.split("*")[0] + "*.csv"
+            filelist = []
+            for file in os.listdir(path):
+                if fnmatch.fnmatch(file, fileglob):
+                    filelist.append(file)
+                    # Add a visible divider to the style list
+                    half_len = round(len(file) / 2)
+                    divider = f"{'-' * (20 - half_len)} {file.upper()}"
+                    divider = f"{divider} {'-' * (40 - len(divider))}"
+                    self.styles[divider] = PromptStyle(
+                        f"{divider}", None, None, "do_not_save"
+                    )
+                    # Add styles from this CSV file
+                    self.load_from_csv(os.path.join(path, file))
+            if len(filelist) == 0:
+                print(f"No styles found in {path} matching {fileglob}")
+                return
+        elif not os.path.exists(self.path):
+            print(f"Style database not found: {self.path}")
             return
+        else:
+            self.load_from_csv(self.path)
 
-        with open(self.path, "r", encoding="utf-8-sig", newline='') as file:
+    def load_from_csv(self, path: str):
+        with open(path, "r", encoding="utf-8-sig", newline="") as file:
             reader = csv.DictReader(file, skipinitialspace=True)
             for row in reader:
+                # Ignore empty rows or rows starting with a comment
+                if not row or row["name"].startswith("#"):
+                    continue
                 # Support loading old CSV format with "name, text"-columns
                 prompt = row["prompt"] if "prompt" in row else row["text"]
                 negative_prompt = row.get("negative_prompt", "")
-                self.styles[row["name"]] = PromptStyle(row["name"], prompt, negative_prompt)
+                # Add style to database
+                self.styles[row["name"]] = PromptStyle(
+                    row["name"], prompt, negative_prompt, path
+                )
+
+    def get_style_paths(self) -> list():
+        """
+        Returns a list of all distinct paths, including the default path, of
+        files that styles are loaded from."""
+        # Update any styles without a path to the default path
+        for style in list(self.styles.values()):
+            if not style.path:
+                self.styles[style.name] = style._replace(path=self.default_path)
+
+        # Create a list of all distinct paths, including the default path
+        style_paths = set()
+        style_paths.add(self.default_path)
+        for _, style in self.styles.items():
+            if style.path:
+                style_paths.add(style.path)
+
+        # Remove any paths for styles that are just list dividers
+        style_paths.remove("do_not_save")
+
+        return list(style_paths)
 
     def get_style_prompts(self, styles):
         return [self.styles.get(x, self.no_style).prompt for x in styles]
@@ -96,20 +200,53 @@ class StyleDatabase:
         return [self.styles.get(x, self.no_style).negative_prompt for x in styles]
 
     def apply_styles_to_prompt(self, prompt, styles):
-        return apply_styles_to_prompt(prompt, [self.styles.get(x, self.no_style).prompt for x in styles])
+        return apply_styles_to_prompt(
+            prompt, [self.styles.get(x, self.no_style).prompt for x in styles]
+        )
 
     def apply_negative_styles_to_prompt(self, prompt, styles):
-        return apply_styles_to_prompt(prompt, [self.styles.get(x, self.no_style).negative_prompt for x in styles])
-
-    def save_styles(self, path: str) -> None:
-        # Always keep a backup file around
-        if os.path.exists(path):
-            shutil.copy(path, f"{path}.bak")
-
-        with open(path, "w", encoding="utf-8-sig", newline='') as file:
-            writer = csv.DictWriter(file, fieldnames=PromptStyle._fields)
-            writer.writeheader()
-            writer.writerows(style._asdict() for k, style in self.styles.items())
+        return apply_styles_to_prompt(
+            prompt, [self.styles.get(x, self.no_style).negative_prompt for x in styles]
+        )
+
+    def save_styles(self, path: str = None) -> None:
+        # The path argument is deprecated, but kept for backwards compatibility
+        _ = path
+
+        # Update any styles without a path to the default path
+        for style in list(self.styles.values()):
+            if not style.path:
+                self.styles[style.name] = style._replace(path=self.default_path)
+
+        # Create a list of all distinct paths, including the default path
+        style_paths = set()
+        style_paths.add(self.default_path)
+        for _, style in self.styles.items():
+            if style.path:
+                style_paths.add(style.path)
+
+        # Remove any paths for styles that are just list dividers
+        style_paths.remove("do_not_save")
+
+        csv_names = [os.path.split(path)[1].lower() for path in style_paths]
+
+        for style_path in style_paths:
+            # Always keep a backup file around
+            if os.path.exists(style_path):
+                shutil.copy(style_path, f"{style_path}.bak")
+
+            # Write the styles to the CSV file
+            with open(style_path, "w", encoding="utf-8-sig", newline="") as file:
+                writer = csv.DictWriter(file, fieldnames=self.prompt_fields)
+                writer.writeheader()
+                for style in (s for s in self.styles.values() if s.path == style_path):
+                    # Skip style list dividers, e.g. "STYLES.CSV"
+                    if style.name.lower().strip("# ") in csv_names:
+                        continue
+                    # Write style fields, ignoring the path field
+                    writer.writerow(
+                        {k: v for k, v in style._asdict().items() if k != "path"}
+                    )
 
     def extract_styles_from_prompt(self, prompt, negative_prompt):
         extracted = []
@@ -120,7 +257,9 @@ class StyleDatabase:
             found_style = None
 
             for style in applicable_styles:
-                is_match, new_prompt, new_neg_prompt = extract_style_from_prompts(style, prompt, negative_prompt)
+                is_match, new_prompt, new_neg_prompt = extract_original_prompts(
+                    style, prompt, negative_prompt
+                )
                 if is_match:
                     found_style = style
                     prompt = new_prompt