Get snippets actions (talonhub#1315)

Added actions to get insertion and wrapper snippet content(body, scope,
etc). This will be used by example cursorless to leverage the community
snippets

Follow up from:
talonhub#1305

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Pokey Rule <755842+pokey@users.noreply.github.com>

core/snippets/README.md

@@ -7,7 +7,15 @@ Custom format to represent snippets.
 - Custom file ending `.snippet`.
 - Supports syntax highlighting in VSCode via an [extension](https://marketplace.visualstudio.com/items?itemName=AndreasArvidsson.andreas-talon)
 - Supports auto-formatting in VSCode via an [extension](https://marketplace.visualstudio.com/items?itemName=AndreasArvidsson.andreas-talon)
-- Support for insertion and wrapper snippets. Note that while the snippet file syntax here supports wrapper snippets, we still need to add the proper voice commands; stay tuned.
+- Support for insertion and wrapper snippets. Note that while the snippet file syntax here supports wrapper snippets, you will need to install [Cursorless](https://www.cursorless.org/) for wrapper snippets to work. You'll also need to add the following line to your `settings.talon` file:
+
+  ```talon
+  tag(): user.cursorless_use_community_snippets
+  ```
+
+  Note that this line will also disable any Cursorless snippets defined in your
+  Cursorless customization CSVs. You will need to migrate your Cursorless snippets to the new community snippet format described here. If you'd be interested in a tool to help with this migration, please leave a comment on [cursorless-dev/cursorless#2149](https://github.com/cursorless-dev/cursorless/issues/2149), ideally with a link to your custom snippets for us to look at.
+
 - Support for phrase formatters.
 
 ## Format

core/snippets/snippet_types.py

@@ -30,3 +30,16 @@ def get_variable_strict(self, name: str):
         if variable is None:
             raise ValueError(f"Snippet '{self.name}' has no variable '{name}'")
         return variable
+
+
+@dataclass
+class InsertionSnippet:
+    body: str
+    scopes: list[str] = None
+
+
+@dataclass
+class WrapperSnippet:
+    body: str
+    variable_name: str
+    scope: str = None

core/snippets/snippets.py

@@ -5,7 +5,7 @@
 from talon import Context, Module, actions, app, fs, settings
 
 from ..modes.language_modes import language_ids
-from .snippet_types import Snippet
+from .snippet_types import InsertionSnippet, Snippet, WrapperSnippet
 from .snippets_parser import create_snippets_from_file
 
 SNIPPETS_DIR = Path(__file__).parent / "snippets"
@@ -64,6 +64,20 @@ def get_snippet(name: str) -> Snippet:
 
         return snippets_map[name]
 
+    def get_insertion_snippet(name: str) -> InsertionSnippet:
+        """Get insertion snippet named <name>"""
+        snippet: Snippet = actions.user.get_snippet(name)
+        return InsertionSnippet(snippet.body, snippet.insertion_scopes)
+
+    def get_wrapper_snippet(name: str) -> WrapperSnippet:
+        """Get wrapper snippet named <name>"""
+        index = name.rindex(".")
+        snippet_name = name[:index]
+        variable_name = name[index + 1]
+        snippet: Snippet = actions.user.get_snippet(snippet_name)
+        variable = snippet.get_variable_strict(variable_name)
+        return WrapperSnippet(snippet.body, variable.name, variable.wrapper_scope)
+
 
 def update_snippets():
     language_to_snippets = group_by_language(get_snippets())

core/snippets/snippets_parser.py

@@ -54,6 +54,7 @@ def create_snippet(
         name=document.name or default_context.name,
         languages=document.languages or default_context.languages,
         phrases=document.phrases or default_context.phrases,
+        insertion_scopes=document.insertionScopes or default_context.insertionScopes,
         variables=combine_variables(default_context.variables, document.variables),
         body=normalize_snippet_body_tabs(document.body),
     )