feat(cli): add a subcommand to easily manage git hooks.

docs/cli.md

@@ -16,6 +16,7 @@
   * [Configuring VectorCode](#configuring-vectorcode)
   * [Vectorising Your Code](#vectorising-your-code)
     * [File Specs](#file-specs)
+    * [Git Hooks](#git-hooks)
   * [Making a Query](#making-a-query)
   * [Listing All Collections](#listing-all-collections)
   * [Removing a Collection](#removing-a-collection)
@@ -353,6 +354,35 @@ on certain conditions. See
 [the wiki](https://github.com/Davidyz/VectorCode/wiki/Tips-and-Tricks#git-hooks) 
 for an example to use it with git hooks.
 
+#### Git Hooks
+
+To keep the embeddings up-to-date, you may find it useful to set up some git
+hooks. The CLI provides a subcommand, `vectorcode hooks`, that helps you manage
+hooks when working with a git repository. You can put some custom hooks in
+`~/.config/vectorcode/hooks/` and the `vectorcode hooks` command will pick them
+up and append them to your existing hooks, or create new hook scripts if they
+don't exist yet. The hook files should be named the same as they would be under
+the `.git/hooks` directory. For example, a pre-commit hook would be named 
+`~/.config/vectorcode/hooks/pre-commit`. By default, there are 2 pre-defined
+hooks:
+```bash
+# pre-commit hook that vectorise changed files before you commit.
+diff_files=$(git diff --cached --name-only)
+[ -z "$diff_files" ] || vectorcode vectorise $diff_files
+```
+```bash
+# post-checkout hook that vectorise changed files when you checkout to a
+# different branch/tag/commit
+files=$(git diff --name-only "$1" "$2")
+[ -z "$files" ] || vectorcode vectorise $files
+```
+When you run `vectorcode hooks` in a git repo, these 2 hooks will be added to
+your `.git/hooks/`. Hooks that are managed by VectorCode will be wrapped by 
+`# VECTORCODE_HOOK_START` and `# VECTORCODE_HOOK_END` comment lines. They help 
+VectorCode determine whether hooks have been added, so don't delete the markers 
+unless you know what you're doing. To remove the hooks, simply delete the lines
+wrapped by these 2 comment strings.
+
 ### Making a Query
 
 To retrieve a list of documents from the database, you can use the following command:

src/vectorcode/cli_utils.py

@@ -59,6 +59,7 @@ class CliAction(Enum):
     clean = "clean"
     prompts = "prompts"
     chunks = "chunks"
+    hooks = "hooks"
 
 
 @dataclass
@@ -283,6 +284,16 @@ def get_cli_parser():
     )
 
     subparsers.add_parser("drop", parents=[shared_parser], help="Remove a collection.")
+    hooks_parser = subparsers.add_parser(
+        "hooks", parents=[shared_parser], help="Inject git hooks."
+    )
+    hooks_parser.add_argument(
+        "--force",
+        "-f",
+        action="store_true",
+        default=False,
+        help="Override existing VectorCode hooks.",
+    )
 
     init_parser = subparsers.add_parser(
         "init",
@@ -379,6 +390,8 @@ async def parse_cli_args(args: Optional[Sequence[str]] = None):
             configs_items["chunk_size"] = main_args.chunk_size
             configs_items["overlap_ratio"] = main_args.overlap
             configs_items["encoding"] = main_args.encoding
+        case "hooks":
+            configs_items["force"] = main_args.force
     return Config(**configs_items)
 
 

src/vectorcode/main.py

@@ -62,6 +62,10 @@ async def async_main():
             from vectorcode.subcommands import chunks
 
             return_val = await chunks(final_configs)
+        case CliAction.hooks:
+            from vectorcode.subcommands import hooks
+
+            return await hooks(cli_args)
 
     from vectorcode.common import start_server, try_server
 

src/vectorcode/subcommands/__init__.py

@@ -2,6 +2,7 @@
 from vectorcode.subcommands.chunks import chunks
 from vectorcode.subcommands.clean import clean
 from vectorcode.subcommands.drop import drop
+from vectorcode.subcommands.hooks import hooks
 from vectorcode.subcommands.init import init
 from vectorcode.subcommands.ls import ls
 from vectorcode.subcommands.prompt import prompts
@@ -14,6 +15,7 @@
     "chunks",
     "clean",
     "drop",
+    "hooks",
     "init",
     "ls",
     "prompts",

src/vectorcode/subcommands/hooks.py

@@ -0,0 +1,105 @@
+import glob
+import logging
+import os
+import platform
+import re
+import stat
+from pathlib import Path
+from typing import Optional
+
+from vectorcode.cli_utils import GLOBAL_CONFIG_PATH, Config, find_project_root
+
+logger = logging.getLogger(name=__name__)
+__GLOBAL_HOOKS_PATH = Path(GLOBAL_CONFIG_PATH).parent / "hooks"
+
+
+# Keys: name of the hooks, ie. `pre-commit`
+# Values: lines of the hooks.
+__HOOK_CONTENTS: dict[str, list[str]] = {
+    "pre-commit": [
+        "diff_files=$(git diff --cached --name-only)",
+        '[ -z "$diff_files" ] || vectorcode vectorise $diff_files',
+    ],
+    "post-checkout": [
+        'files=$(git diff --name-only "$1" "$2")',
+        '[ -z "$files" ] || vectorcode vectorise $files',
+    ],
+}
+
+
+def __lines_are_empty(lines: list[str]) -> bool:
+    pattern = re.compile(r"^\s*$")
+    if len(lines) == 0:
+        return True
+    return all(map(lambda line: pattern.match(line) is not None, lines))
+
+
+def load_hooks():
+    global __HOOK_CONTENTS
+    for file in glob.glob(str(__GLOBAL_HOOKS_PATH / "*")):
+        hook_name = Path(file).stem
+        with open(file) as fin:
+            lines = fin.readlines()
+            if not __lines_are_empty(lines):
+                __HOOK_CONTENTS[hook_name] = lines
+
+
+class HookFile:
+    prefix = "# VECTORCODE_HOOK_START"
+    suffix = "# VECTORCODE_HOOK_END"
+    prefix_pattern = re.compile(r"^\s*#\s*VECTORCODE_HOOK_START\s*")
+    suffix_pattern = re.compile(r"^\s*#\s*VECTORCODE_HOOK_END\s*")
+
+    def __init__(self, path: str | Path, git_dir: Optional[str | Path] = None):
+        self.path = path
+        self.lines: list[str] = []
+        if os.path.isfile(self.path):
+            with open(self.path) as fin:
+                self.lines.extend(fin.readlines())
+
+    def has_vectorcode_hooks(self, force: bool = False) -> bool:
+        for start, start_line in enumerate(self.lines):
+            if self.prefix_pattern.match(start_line) is None:
+                continue
+
+            for end in range(start + 1, len(self.lines)):
+                if self.suffix_pattern.match(self.lines[end]) is not None:
+                    if force:
+                        logger.debug("`force` cleaning existing VectorCode hooks...")
+                        new_lines = self.lines[:start] + self.lines[end + 1 :]
+                        self.lines[:] = new_lines
+                        return False
+                    logger.debug(
+                        f"Found vectorcode hook block between line {start} and {end} in {self.path}:\n{''.join(self.lines[start + 1 : end])}"
+                    )
+                    return True
+
+        return False
+
+    def inject_hook(self, content: list[str], force: bool = False):
+        if len(self.lines) == 0 or not self.has_vectorcode_hooks(force):
+            self.lines.append(self.prefix + "\n")
+            self.lines.extend(i if i.endswith("\n") else i + "\n" for i in content)
+            self.lines.append(self.suffix + "\n")
+        with open(self.path, "w") as fin:
+            fin.writelines(self.lines)
+        if platform.system() != "Windows":
+            # for unix systems, set the executable bit.
+            curr_mode = os.stat(self.path).st_mode
+            os.chmod(self.path, mode=curr_mode | stat.S_IXUSR)
+
+
+async def hooks(configs: Config) -> int:
+    project_root = configs.project_root or "."
+    git_root = find_project_root(project_root, ".git")
+    if git_root is None:
+        logger.error(f"{project_root} is not inside a git repo directory!")
+        return 1
+    load_hooks()
+    for hook in __HOOK_CONTENTS.keys():
+        hook_file_path = os.path.join(git_root, ".git", "hooks", hook)
+        logger.info(f"Writing {hook} hook into {hook_file_path}.")
+        print(f"Processing {hook} hook...")
+        hook_obj = HookFile(hook_file_path, git_dir=git_root)
+        hook_obj.inject_hook(__HOOK_CONTENTS[hook], configs.force)
+    return 0