Defer loading of networkx

aider/repomap.py

@@ -8,7 +8,6 @@ from collections import Counter, defaultdict, namedtuple
 from importlib import resources
 from pathlib import Path
 
-import networkx as nx
 from diskcache import Cache
 from grep_ast import TreeContext, filename_to_lang
 from pygments.lexers import guess_lexer_for_filename
@@ -32,6 +31,7 @@ class RepoMap:
     cache_missing = False
 
     warned_files = set()
+    nx = None
 
     def __init__(
         self,
@@ -58,6 +58,15 @@ class RepoMap:
         self.token_count = main_model.token_count
         self.repo_content_prefix = repo_content_prefix
 
+    def import_nx(self):
+        """Import nx as needed, to avoid 250ms on launch"""
+
+        if self.nx:
+            return
+        import networkx as nx
+
+        self.nx = nx
+
     def get_repo_map(self, chat_files, other_files, mentioned_fnames=None, mentioned_idents=None):
         if self.max_map_tokens <= 0:
             return
@@ -230,6 +239,8 @@ class RepoMap:
             )
 
     def get_ranked_tags(self, chat_fnames, other_fnames, mentioned_fnames, mentioned_idents):
+        self.import_nx()
+
         defines = defaultdict(set)
         references = defaultdict(list)
         definitions = defaultdict(set)
@@ -295,7 +306,7 @@ class RepoMap:
 
         idents = set(defines.keys()).intersection(set(references.keys()))
 
-        G = nx.MultiDiGraph()
+        G = self.nx.MultiDiGraph()
 
         for ident in idents:
             definers = defines[ident]
@@ -326,7 +337,7 @@ class RepoMap:
             pers_args = dict()
 
         try:
-            ranked = nx.pagerank(G, weight="weight", **pers_args)
+            ranked = self.nx.pagerank(G, weight="weight", **pers_args)
         except ZeroDivisionError:
             return []