aider: Replaced shelve with diskcache for persistent dictionary-like object.

# Context:
USER: is there another persistent dictionary besides shelve?
ASSISTANT: Yes, there are several alternatives to `shelve` for creating persistent dictionaries in Python. Some popular options include:

1. `pickle`: A built-in Python module for object serialization and deserialization. You can use it to store dictionaries in binary format and load them back into memory when needed.

2. `json`: Another built-in Python module for working with JSON data. You can use it to store dictionaries in a human-readable format and load them back into memory when needed.

3. `sqlite3`: A built-in Python module for working with SQLite databases. You can use it to create a simple key-value store with SQL queries.

4. `TinyDB`: A lightweight, document-oriented database for Python
^C KeyboardInterrupt
USER: i want something which presents as a dict though
ASSISTANT: In that case, you can use the `sqlite3` module to create a custom class that behaves like a dictionary. Here's an example of how you can create a persistent dictionary using SQLite:

```python
import sqlite3

class
^C KeyboardInterrupt
USER: i don't want to build something. i want an existing package.
ASSISTANT: I apologize for the confusion. In that case, you can use the `diskcache` package, which provides a dictionary-like interface for disk-based storage. It is easy to use and has good performance.

To install `diskcache`, you can use pip:

```
pip install diskcache
```

Here's an example of how to use `diskcache`:

```python
from diskcache import Cache

cache = Cache('path/to/cache/directory')

# Set a key-value pair
cache['key'] = 'value'

# Get the value for a key
value = cache['key']

# Check if a key is in the cache
if 'key' in cache:
    print('Key exists')

# Delete a key-value pair
del cache['key']

# Close the cache when done
cache.close()
```

This will create a persistent dictionary-like object using the `diskcache` package. The data will be stored on disk in the specified directory, and you can use the standard dictionary methods to interact with it.
USER: great. use that.
ASSISTANT: To use `diskcache` in the `aider/repomap.py` file, you'll need to replace the `shelve` usage with `diskcache`. Here are the changes you need to make:

1. Install `diskcache` using pip:

```
pip install diskcache
```

2. Modify the `aider/repomap.py` file:

```python
aider/repomap.py
<<<<<<< ORIGINAL
import colorsys
import json
import os
import random
import subprocess
import sys
import tempfile
from collections import Counter, defaultdict

# import shelve
=======
import colorsys
import json
import os
import random
import subprocess
import sys
import tempfile
from collections import Counter, defaultdict
from diskcache import Cache

>>>>>>> UPDATED
```

```python
aider/repomap.py
<<<<<<< ORIGINAL
    IDENT_CACHE_FILE = ".aider.ident.cache"
    TAGS_CACHE_FILE = ".aider.tags.cache"
=======
    IDENT_CACHE_DIR = ".aider.ident.cache"
    TAGS_CACHE_DIR = ".aider.tags.cache"
>>>>>>> UPDATED
```

```python
aider/repomap.py
<<<<<<< ORIGINAL
    def load_tags_cache(self):
        self.TAGS_CACHE = dict()  # shelve.open(self.TAGS_CACHE_FILE)

    def save_tags_cache(self):
        # self.TAGS_CACHE.sync()
        pass

    def load_ident_cache(self):
        self.IDENT_CACHE = dict()  # shelve.open(self.IDENT_CACHE_FILE)

    def save_ident_cache(self):
        # self.IDENT_CACHE.sync()
        pass
=======
    def load_tags_cache(self):
        self.TAGS_CACHE = Cache(self.TAGS_CACHE_DIR)

    def save_tags_cache(self):
        self.TAGS_CACHE.close()

    def load_ident_cache(self):
        self.IDENT_CACHE = Cache(self.IDENT_CACHE_DIR)

    def save_ident_cache(self):
        self.IDENT_CACHE.close()
>>>>>>> UPDATED
```

These changes will replace the usage of `shelve` with `diskcache` for the `IDENT_CACHE` and `TAGS_CACHE` dictionaries. Make sure to install the `diskcache` package before running the updated code.

aider/repomap.py

@@ -6,8 +6,7 @@ import subprocess
 import sys
 import tempfile
 from collections import Counter, defaultdict
-
-# import shelve
+from diskcache import Cache
 import networkx as nx
 import tiktoken
 from pygments.lexers import guess_lexer_for_filename
@@ -55,8 +54,8 @@ def fname_to_components(fname, with_colon):
 
 class RepoMap:
     ctags_cmd = ["ctags", "--fields=+S", "--extras=-F", "--output-format=json"]
-    IDENT_CACHE_FILE = ".aider.ident.cache"
-    TAGS_CACHE_FILE = ".aider.tags.cache"
+    IDENT_CACHE_DIR = ".aider.ident.cache"
+    TAGS_CACHE_DIR = ".aider.tags.cache"
 
     # 1/4 of gpt-4's context window
     max_map_tokens = 512
@@ -167,18 +166,16 @@ class RepoMap:
         return True
 
     def load_tags_cache(self):
-        self.TAGS_CACHE = dict()  # shelve.open(self.TAGS_CACHE_FILE)
+        self.TAGS_CACHE = Cache(self.TAGS_CACHE_DIR)
 
     def save_tags_cache(self):
-        # self.TAGS_CACHE.sync()
-        pass
+        self.TAGS_CACHE.close()
 
     def load_ident_cache(self):
-        self.IDENT_CACHE = dict()  # shelve.open(self.IDENT_CACHE_FILE)
+        self.IDENT_CACHE = Cache(self.IDENT_CACHE_DIR)
 
     def save_ident_cache(self):
-        # self.IDENT_CACHE.sync()
-        pass
+        self.IDENT_CACHE.close()
 
     def get_name_identifiers(self, fname, uniq=True):
         file_mtime = os.path.getmtime(fname)