rgapi

rgapi provides fd-style file discovery and rg-style text search from Python without starting a shell command.

It uses the same ignore, grep-regex, and grep-searcher crates that ripgrep uses for walking, regex matching, and file scanning. Walking and searching run in parallel by default. Most expensive work stays in Rust.

Overview

For common file discovery and search:

from rgapi import fd, ls, rg, rg_iter

fd(".", ext="py", exclude="test_*.py")
ls("src")
for row in rg_iter("TODO", ".", include="*.py", context=2): print(row.asdict())
rg("TODO", ".", ext="py", skip_dir=".venv", paths=True)

For cell-aware search of Jupyter notebooks (see Notebooks):

from rgapi import nbrg

nbrg("read_csv", ".", cell_context=1)

Walk and search functions have async versions. Streaming versions yield results as the search finds them. See Async:

from rgapi import fda, rga, rga_iter, nbrga, nbrga_iter

await rga("TODO", ".", ext="py", timeout_ms=200)
async for row in rga_iter("TODO", "."): print(row)

Use the lower-level functions to compile a regex, search text or a single file, or walk a directory:

from rgapi import compile, search_path, search_text, walk

matcher = compile("TODO")
matcher.is_match("TODO")
matcher.finditer("TODO TODO")

walk(".")
search_text(matcher, "alpha\nTODO\nomega\n", path="memory.txt", context=1)
search_path(matcher, "src/lib.rs", display_path="src/lib.rs")

Install

pip install rgapi

File discovery

fd and walk return slash-separated paths relative to root. Pass root as a str or pathlib.Path. The sync and async APIs expand ~ and accept ., ./, and paths containing ...

Discovery uses the ignore crate with ripgrep's default filters. It reads .gitignore, .ignore, and .rgignore files. .rgignore takes precedence over .gitignore. Pass ignore=False to disable all ignore-file filtering, including .rgignore.

Hidden files are skipped unless hidden=True. Symlinks are followed only with follow_links=True. Use same_file_system=True to avoid crossing filesystem boundaries.

Traversal runs in parallel without guaranteed result order. Use sorted(...) when order matters.

fd adds filename filters to walk. Its pattern is a smart-case regex matched against each basename. Lowercase patterns match case-insensitively. A pattern containing uppercase letters is case-sensitive. Use path_re to match the slash-separated relative path instead.

include and exclude use glob syntax. glob= is an alias for include=. A basename glob such as *.py also matches nested paths such as src/app.py.

Filter extensions with ext="py" or ext=["py", "rs"]. Extension and glob filters must both match. For example, include="src/*", ext="py" requires src/* and *.py, like combining rg -g with -t.

Set min_depth and max_depth to bound recursion. max_filesize skips files above a byte limit.

ls follows the shell command's listing conventions. It uses fd with max_depth=1, includes directories, disables ignore rules, and sorts by name. Set hidden=True for ls -a behaviour. All fd filters remain available.

fd_iter yields FileEntry paths as the walk finds them. It accepts every fd filter. Stopping iteration ends the walk. It does not accept timeout_ms.

path_re and skip_path_re filter slash-separated relative paths using regexes. They select returned paths or searched files without changing traversal. To skip entire subtrees, use skip_dir with a glob or skip_dir_re with a regex.

Text search

rg and rg_iter return structured SearchLine rows. They accept the same filters as fd: include, exclude, glob, ext, path_re, skip_path_re, skip_dir, skip_dir_re, min_depth, max_depth, max_filesize, follow_links, and same_file_system.

Search is case-sensitive by default, matching rg. Use smart_case=True for rg --smart-case behaviour. Use case_sensitive=False to force case-insensitive matching.

Each SearchLine has these fields:

kind         'match', 'before', 'after', or 'context'
path         path relative to root
line_number  1-based line number
lnhash       exhash-style `lineno|hash|` address for the line
line         line text without the trailing newline
matches      list of (start, end) byte offsets for match rows

rg, search_text, and search_path return SearchResults by default. This list subclass displays as rg-style multiline text in str() and notebook pretty output. rg_iter yields rows lazily.

SearchLine has a structured repr and an rg-style str. The string display truncates line to 180 characters with a trailing …. repr and asdict() retain the full line. SearchLine.asdict() returns the fields as a plain Python dictionary.

Pass lnhashs=True to rg or rg_iter to display hash addresses instead of line numbers. The line_number field remains available.

For other result forms, use rg(..., paths=True) to return unique matched paths or rg(..., count=True) to count match spans. paths and count cannot both be set.

Path results

fd, walk, and ls return PathResults. So do rg and nbrg with paths=True. This is a list of FileEntry rows.

A FileEntry is a str subclass containing a relative path. Its stat property calls os.lstat on first access and caches the result. It returns None if the path has vanished. size, mtime, and is_dir use the cached stat result. The object also supports ordinary string operations.

PathResults displays as an ls -l-style listing of at most rgapi.MAX_REPR rows. A final … N more line reports omitted rows. Only displayed rows need stat calls. str() returns one plain path per line. list(res) also displays plain paths.

Limits and timeouts

Set timeout_ms on rg, fd, walk, or ls to stop at a deadline and return the results collected so far. Their async versions accept it too. Results report why the operation stopped:

• stop_reason=None means the result is complete.
• stop_reason="max_results" means max_results truncated the result.
• stop_reason="timeout" means the deadline was reached.

complete is true exactly when stop_reason is None. count=True returns a plain integer without a completion flag. It cannot be combined with timeout_ms.

Context lines

before_context, after_context, and context correspond to rg -B, rg -A, and rg -C. Files containing NUL bytes or invalid UTF-8 are skipped.

Block summaries

rg(..., summary=True) returns one row per blank-line-delimited block instead of one row per matching line. Empty and whitespace-only lines delimit blocks. A block containing several matching lines appears once and keeps every matching SearchLine in matches.

rg("TODO", ".", summary=True, context=1, maxlen=120)

The result is BlockResults, a list of SearchBlock objects. Each block has path, block_index, start_line, end_line, start_lnhash, end_lnhash, kind, full source, and matches.

Matches display as path:start-end:source. Context displays as path:start-end-source. With lnhashs=True, the range uses copyable boundary addresses such as path:4|a3f2|,6|b1c3|:source. Newline runs display as ¶. maxlen limits the displayed text without changing source or asdict().

In summary mode, before_context, after_context, and context count neighbouring blocks. max_results counts matching blocks and retains their context. summary=True cannot be combined with paths or count. It can be combined with lnhash for copyable block boundaries.

Notebooks

nbrg searches cell source in Jupyter .ipynb files and returns matching cells. Each result identifies the cell by its nbformat cell/message id, which stays stable across edits.

Plain rg searches escaped notebook JSON, including outputs and metadata. Its line numbers refer to that JSON file. nbrg searches the reconstructed cell source and identifies the cell you would edit.

from rgapi import nbrg

nbrg("read_csv", ".")                  # cells whose source matches, across all notebooks under "."
nbrg("read_csv", ".", cell_context=1)  # also include neighbouring cells as context

Notebook discovery, parsing, and matching run together in one parallel Rust pass. Matching uses rg's regex engine with the same case_sensitive and smart_case behaviour. nbrg accepts the discovery filters from fd and rg, including include, exclude, glob, hidden, max_depth, and skip_dir.

nbrg returns NbResults, a list of NbCell. Each NbCell has:

path         notebook path relative to root
cell_index   0-based position of the cell in the notebook
cell_id      nbformat cell id (falls back to the cell index for notebooks without ids)
cell_type    'code', 'markdown', or 'raw'
kind         'match' or 'context'
source       full cell source
matches      list of SearchLine rows for the matched lines within the cell

NbCell.asdict() returns these fields as a plain dictionary. Its matches field contains SearchLine dictionaries.

str() and pretty display show one line per cell. Matches use path:cell_id:source. Context uses path:cell_id-source. Newline runs display as ¶.

A matching cell's display starts at its first matched line. Earlier lines are replaced by …[Ln], where n is the matched line's one-based number within the cell. A leading #| directive is retained, as in #| export…[L4]needle here.

maxlen limits displayed source and defaults to 120. The full source remains in source and asdict(). Each cell appears once even when it has multiple matches. All hits remain in matches.

cell_context=N includes the N cells before and after each match as kind="context" rows. Context cells are deduplicated within each notebook.

nbrg_iter yields NbCell rows as notebooks are parsed. For collected results, nbrg accepts these limits and result options:

• max_results returns at most that many cells after sorting by path and cell index.
• count=True returns the number of matching cells.
• timeout_ms applies a deadline with the same stop_reason values as rg.

The parser reads only each cell's id, cell_type, and source. It skips outputs and metadata without loading embedded images or plots. search_nb(pattern, path, ...) searches a single notebook file in the same way.

rgapi-nbrg exposes notebook search without requiring a Python kernel:

rgapi-nbrg 'read_csv' .
rgapi-nbrg 'read_csv' . --cell-context 1
rgapi-nbrg 'read_csv' nbs --glob '*.ipynb' --max-results 20

Run rgapi-nbrg --help for its discovery, matching, and output options.

Async

fda, rga, and nbrga are async versions of fd, rg, and nbrg. The async generators fda_iter, rga_iter, and nbrga_iter yield rows as the search finds them. Async functions accept the same arguments and return the same types as their synchronous equivalents.

from rgapi import fda, rga, rga_iter

await fda(".", ext="py")
res = await rga("TODO", ".", timeout_ms=200)
if not res.complete: print(f"partial results: {res.stop_reason}")
async for row in rga_iter("TODO", "."): ...

Walking and searching use Rust threads, without asyncio.to_thread or the event loop's executor. A callback uses loop.call_soon_threadsafe to complete the awaited future or supply results to the generator's queue. The event loop remains unblocked, with normal contextvars behaviour.

Cancellation stops the Rust workers within about one row. This includes timeouts from asyncio.wait_for or asyncio.timeout. It also includes task cancellation, such as starlette cancelling a disconnected client's request.

Wrap an async iterator in contextlib.aclosing when leaving its loop early. break alone delays generator finalization until garbage collection. The context manager provides prompt cleanup:

async with aclosing(rga_iter("TODO", ".")) as it:
    async for row in it:
        if enough(row): break

Use streaming results for incremental display, such as sending batches to a browser as they arrive. Collected results with timeout_ms return what was found before the deadline. Use asyncio.wait_for when a timeout should raise instead.

Benchmarks

tools/bench.py compares the rg CLI with in-process rgapi. Run it against a release build. One run on this machine, using best time from seven repeats: