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fix(flare-proxy): shortcircuit extract_filepaths treats shell redirects as literal filenames - #396

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getappz merged 2 commits into
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task/13
Aug 7, 2026
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fix(flare-proxy): shortcircuit extract_filepaths treats shell redirects as literal filenames#396
getappz merged 2 commits into
masterfrom
task/13

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@getappz

@getappz getappz commented Aug 7, 2026

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Summary

  • extract_filepaths() (used by flare-proxy's shortcircuit mock to answer "what file paths did this command touch" without a real LLM round trip) split commands on whitespace with no notion of shell redirection, so tail -5 <path> 2>/dev/null treated 2>/dev/null as a second literal filepath.
  • Adds is_shell_operator_token (fused forms like 2>/dev/null) and is_bare_redirect_operator (space-separated forms like cmd > out.txt, dropping the following target token too) and applies both in the reading-command and grep branches.

This is the actual fix for the original vent report (item #13) that surfaced as tail -5 <path> 2>/dev/null failing with a misleading "file not found" error -- produced autonomously via the now-fixed supervisor dispatch pipeline (#392-#395), reviewed and shipped by me.

Test plan

  • 3 new regression tests: fused stderr redirect, space-separated stdout redirect, grep + redirect
  • cargo test -p flare-proxy -- shortcircuit -- 31 pass
  • cargo clippy -p flare-proxy --all-targets --all-features -- -D warnings -- clean

Summary by CodeRabbit

  • Bug Fixes
    • Improved command parsing when reading files or searching with grep.
    • Redirects and shell control operators are now excluded from extracted file paths.
    • Correctly handles standard output and error redirects, including their target paths.

…ects as literal filenames

extract_filepaths() answers "what file paths did this command touch" for
reading commands (cat/head/tail/etc.) and grep without a real LLM round
trip, by splitting the command on whitespace and keeping every token that
doesn't start with '-'. That has no notion of shell redirection, so
`tail -5 <path> 2>/dev/null` produced filepaths ["<path>", "2>/dev/null"] --
the redirect got treated as a second literal file, surfacing downstream as
a "file not found: .../2>/dev/null" error that looked like a missing-file
problem rather than the real quoting/redirect issue.

Adds is_shell_operator_token (catches fused forms like `2>/dev/null`,
`>>`, `|`, `&&`, `;`) and is_bare_redirect_operator (catches
space-separated forms like `cmd > out.txt`, where the *next* token is a
target, not something read) and applies both filters in the reading-command
and grep branches.
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coderabbitai Bot commented Aug 7, 2026

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Review Change Stack

📝 Walkthrough

Walkthrough

The change adds shell-operator detection to reading and grep filepath extraction. Redirection operators and their targets are excluded, while actual input paths remain included. Tests cover stderr redirects, stdout redirects, and grep redirects.

Changes

Filepath extraction

Layer / File(s) Summary
Operator-aware filepath extraction
crates/flare-proxy/src/shortcircuit.rs
The parser identifies shell operators and redirect targets. Reading and grep commands exclude these tokens from extracted filepaths. Tests cover stdout and stderr redirects while preserving input paths.

Estimated code review effort: 2 (Simple) | ~15 minutes

Possibly related PRs

🚥 Pre-merge checks | ✅ 5
✅ Passed checks (5 passed)
Check name Status Explanation
Title check ✅ Passed The title clearly and concisely describes the fix for treating shell redirects as literal file paths.
Description check ✅ Passed The description explains the change, motivation, implementation, and test results, but it omits the optional Notes for reviewers section.
Docstring Coverage ✅ Passed Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
Linked Issues check ✅ Passed Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check ✅ Passed Check skipped because no linked issues were found for this pull request.
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Actionable comments posted: 2

🤖 Prompt for all review comments with AI agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@crates/flare-proxy/src/shortcircuit.rs`:
- Around line 259-262: Update is_shell_operator_token and the surrounding
command-token parsing to recognize shell operators embedded within an argument,
such as src/main.rs>out.txt, before filepath classification. Ensure redirects
attached to preceding arguments are tokenized or otherwise handled as operators,
and add coverage for both cat src/main.rs>out.txt and grep pattern
src/main.rs>out.txt.
- Around line 305-310: Update the token-scanning loops in shortcircuit filepath
extraction to terminate when encountering command separators |, ||, &&, ;, or &,
while retaining existing bare-redirect handling before continuing. Add
regression tests covering separators followed by command tokens, including the
cat/&& and grep/| examples, and verify later command arguments are not extracted
as filepaths.
🪄 Autofix

Fix all unresolved CodeRabbit comments on this PR:

  • Push a commit to this branch (recommended)
  • Create a new PR with the fixes

ℹ️ Review info
⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 948888ca-0685-416c-a54d-27c2e644fe97

📥 Commits

Reviewing files that changed from the base of the PR and between ae4bb66 and 184d92a.

📒 Files selected for processing (1)
  • crates/flare-proxy/src/shortcircuit.rs

Comment on lines +259 to +262
fn is_shell_operator_token(part: &str) -> bool {
let trimmed = part.trim_start_matches(|c: char| c.is_ascii_digit());
matches!(trimmed.chars().next(), Some('>' | '<' | '&' | '|' | ';'))
}

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🎯 Functional Correctness | 🟠 Major | 🏗️ Heavy lift

🧩 Analysis chain

🏁 Script executed:

#!/bin/bash
set -eu

printf '%s\n' '--- target implementation ---'
sed -n '230,330p' crates/flare-proxy/src/shortcircuit.rs

printf '%s\n' '--- filepath extraction and tests ---'
sed -n '330,370p' crates/flare-proxy/src/shortcircuit.rs
sed -n '700,750p' crates/flare-proxy/src/shortcircuit.rs

printf '%s\n' '--- related symbols and command parsing ---'
rg -n -C 3 'is_shell_operator_token|split_whitespace|filepath|filepaths|redirect|shortcircuit' crates/flare-proxy/src/shortcircuit.rs

Repository: getappz/agentflare

Length of output: 17627


🏁 Script executed:

#!/bin/bash
set -eu

python3 - <<'PY'
def is_shell_operator_token(part):
    trimmed = part.lstrip("0123456789")
    return bool(trimmed) and trimmed[0] in "><&|;"

def is_bare_redirect_operator(part):
    trimmed = part.lstrip("0123456789")
    return trimmed in (">", ">>", "<", "<<", "&>", "&>>")

def extract_filepaths(command):
    reading_commands = {"cat", "head", "tail", "less", "more", "bat", "type"}
    parts = command.split()
    if not parts:
        return []
    base_cmd = parts[0].replace("\\", "/").rsplit("/", 1)[-1].lower()

    if base_cmd in reading_commands:
        filepaths = []
        skip_next = False
        for part in parts[1:]:
            if skip_next:
                skip_next = False
                continue
            if part.startswith("-"):
                continue
            if is_shell_operator_token(part):
                if is_bare_redirect_operator(part):
                    skip_next = True
                continue
            filepaths.append(part)
        return filepaths

    if base_cmd == "grep":
        flags_with_args = {"-e", "-f", "-m", "-A", "-B", "-C"}
        pattern_via_flag = False
        positional = []
        skip_next = False
        for part in parts[1:]:
            if skip_next:
                skip_next = False
                continue
            if part.startswith("-"):
                if part in flags_with_args:
                    if part in {"-e", "-f"}:
                        pattern_via_flag = True
                    skip_next = True
                continue
            if is_shell_operator_token(part):
                if is_bare_redirect_operator(part):
                    skip_next = True
                continue
            positional.append(part)
        return positional if pattern_via_flag else (positional[1:] if len(positional) > 1 else [])

for command in (
    "cat src/main.rs>out.txt",
    "grep pattern src/main.rs>out.txt",
    "cat src/main.rs > out.txt",
    "grep pattern src/main.rs > out.txt",
):
    print(f"{command!r} -> {extract_filepaths(command)!r}")
PY

printf '%s\n' '--- operator/tokenizer implementations elsewhere ---'
rg -n -i -C 2 'shell.?token|tokeniz|split_whitespace|is_shell_operator|redirect' crates/flare-proxy

Repository: getappz/agentflare

Length of output: 5316


Handle redirects attached to preceding arguments. command.split_whitespace() keeps src/main.rs>out.txt as one token. Because is_shell_operator_token checks only the first non-digit character, the parser reports the combined token as a filepath. Tokenize shell operators before filepath classification, or use a shell-aware tokenizer. Add cases for cat src/main.rs>out.txt and grep pattern src/main.rs>out.txt.

🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In `@crates/flare-proxy/src/shortcircuit.rs` around lines 259 - 262, Update
is_shell_operator_token and the surrounding command-token parsing to recognize
shell operators embedded within an argument, such as src/main.rs>out.txt, before
filepath classification. Ensure redirects attached to preceding arguments are
tokenized or otherwise handled as operators, and add coverage for both cat
src/main.rs>out.txt and grep pattern src/main.rs>out.txt.

Comment on lines +305 to +310
if is_shell_operator_token(part) {
if is_bare_redirect_operator(part) {
skip_next = true;
}
continue;
}

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🎯 Functional Correctness | 🟠 Major | 🏗️ Heavy lift

🧩 Analysis chain

🏁 Script executed:

#!/bin/bash
set -eu

printf '%s\n' '--- available context tools ---'
command -v ctx_search || true
command -v ctx_callgraph || true
command -v ctx_compose || true
command -v ctx_read || true
command -v ctx_shell || true

printf '%s\n' '--- target file outline ---'
if command -v ast-grep >/dev/null 2>&1; then
  ast-grep outline crates/flare-proxy/src/shortcircuit.rs
else
  printf '%s\n' 'ast-grep unavailable'
fi

printf '%s\n' '--- relevant source ---'
sed -n '260,365p' crates/flare-proxy/src/shortcircuit.rs

printf '%s\n' '--- symbols and call sites ---'
rg -n -C 3 'is_shell_operator_token|is_bare_redirect_operator|positional|skip_next|shortcircuit' crates/flare-proxy/src/shortcircuit.rs crates/flare-proxy/src

Repository: getappz/agentflare

Length of output: 24533


🏁 Script executed:

#!/bin/bash
set -eu

python3 - <<'PY'
from pathlib import Path

p = Path("crates/flare-proxy/src/shortcircuit.rs")
lines = p.read_text().splitlines()

for start, end in [(1, 180), (260, 365)]:
    print(f"--- shortcircuit.rs:{start}-{end} ---")
    for i in range(start, min(end, len(lines)) + 1):
        print(f"{i:4}: {lines[i-1]}")
PY

printf '%s\n' '--- tests and fixtures related to path extraction ---'
rg -n -C 4 'filepath|file path|positional|redirect|pipeline|operator|&&|\|\||cat |grep ' crates/flare-proxy tests crates 2>/dev/null | head -n 500

Repository: getappz/agentflare

Length of output: 46911


🏁 Script executed:

#!/bin/bash
set -eu

printf '%s\n' '--- available context tools ---'
command -v ctx_search || true
command -v ctx_callgraph || true
command -v ctx_compose || true
command -v ctx_read || true
command -v ctx_shell || true

printf '%s\n' '--- relevant source ---'
sed -n '260,365p' crates/flare-proxy/src/shortcircuit.rs

printf '%s\n' '--- related symbols and tests ---'
rg -n -C 4 'is_shell_operator_token|is_bare_redirect_operator|positional|skip_next|filepath|redirect|pipeline|operator|&&|\|\||cat |grep ' crates/flare-proxy/src crates/flare-proxy/tests tests 2>/dev/null | head -n 500

Repository: getappz/agentflare

Length of output: 39976


🏁 Script executed:

#!/bin/bash
set -eu

python3 - <<'PY'
def is_shell_operator_token(part):
    trimmed = part.lstrip("0123456789")
    return bool(trimmed) and trimmed[0] in "><&|;"

def is_bare_redirect_operator(part):
    trimmed = part.lstrip("0123456789")
    return trimmed in {">", ">>", "<", "<<", "&>", "&>>"}

def implemented_paths(command):
    parts = command.split()
    if not parts:
        return []

    base_cmd = parts[0].replace("\\", "/").split("/")[-1].lower()
    reading = {"cat", "head", "tail", "less", "more", "bat", "type"}

    if base_cmd in reading:
        paths = []
        skip_next = False
        for part in parts[1:]:
            if skip_next:
                skip_next = False
                continue
            if part.startswith("-"):
                continue
            if is_shell_operator_token(part):
                if is_bare_redirect_operator(part):
                    skip_next = True
                continue
            paths.append(part)
        return paths

    if base_cmd == "grep":
        flags_with_args = {"-e", "-f", "-m", "-A", "-B", "-C"}
        pattern_via_flag = False
        positional = []
        skip_next = False
        for part in parts[1:]:
            if skip_next:
                skip_next = False
                continue
            if part.startswith("-"):
                if part in flags_with_args:
                    if part in {"-e", "-f"}:
                        pattern_via_flag = True
                    skip_next = True
                continue
            if is_shell_operator_token(part):
                if is_bare_redirect_operator(part):
                    skip_next = True
                continue
            positional.append(part)
        return positional if pattern_via_flag else positional[1:] if len(positional) > 1 else []

cases = {
    "cat src/main.rs && echo done": ["src/main.rs", "echo", "done"],
    "grep pattern src/main.rs | sort": ["src/main.rs", "sort"],
    "cat src/main.rs > out.txt": ["src/main.rs"],
    "grep -e pattern src/main.rs | sort": ["src/main.rs", "sort"],
}
for command, expected in cases.items():
    actual = implemented_paths(command)
    print(f"{command!r} -> {actual!r}")
    assert actual == expected, (command, actual, expected)
PY

printf '%s\n' '--- command extraction implementation ---'
sed -n '175,215p' crates/flare-proxy/src/shortcircuit.rs

printf '%s\n' '--- existing filepath tests ---'
sed -n '690,755p' crates/flare-proxy/src/shortcircuit.rs

Repository: getappz/agentflare

Length of output: 4120


🏁 Script executed:

#!/bin/bash
set -eu

python3 - <<'PY'
def is_shell_operator_token(part):
    trimmed = part.lstrip("0123456789")
    return bool(trimmed) and trimmed[0] in "><&|;"

def is_bare_redirect_operator(part):
    trimmed = part.lstrip("0123456789")
    return trimmed in {">", ">>", "<", "<<", "&>", "&>>"}

def implemented_paths(command):
    parts = command.split()
    base_cmd = parts[0].replace("\\", "/").split("/")[-1].lower()
    if base_cmd in {"cat", "head", "tail", "less", "more", "bat", "type"}:
        paths, skip_next = [], False
        for part in parts[1:]:
            if skip_next:
                skip_next = False
                continue
            if part.startswith("-"):
                continue
            if is_shell_operator_token(part):
                if is_bare_redirect_operator(part):
                    skip_next = True
                continue
            paths.append(part)
        return paths
    if base_cmd == "grep":
        positional, skip_next, pattern_via_flag = [], False, False
        for part in parts[1:]:
            if skip_next:
                skip_next = False
                continue
            if part.startswith("-"):
                if part in {"-e", "-f", "-m", "-A", "-B", "-C"}:
                    pattern_via_flag |= part in {"-e", "-f"}
                    skip_next = True
                continue
            if is_shell_operator_token(part):
                if is_bare_redirect_operator(part):
                    skip_next = True
                continue
            positional.append(part)
        return positional if pattern_via_flag else positional[1:] if len(positional) > 1 else []

cases = {
    "cat src/main.rs && echo done": ["src/main.rs", "echo", "done"],
    "grep pattern src/main.rs | sort": ["src/main.rs", "sort"],
}
for command, expected in cases.items():
    actual = implemented_paths(command)
    print(f"{command!r} -> {actual!r}")
    assert actual == expected
PY

Repository: getappz/agentflare

Length of output: 283


Stop filepath extraction at command separators. In both loops, later command tokens become filepaths. For example, cat src/main.rs && echo done includes echo and done, and grep pattern src/main.rs | sort includes sort. Stop scanning at |, ||, &&, ;, and &, while preserving redirect handling. Add regression tests for both cases.

🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In `@crates/flare-proxy/src/shortcircuit.rs` around lines 305 - 310, Update the
token-scanning loops in shortcircuit filepath extraction to terminate when
encountering command separators |, ||, &&, ;, or &, while retaining existing
bare-redirect handling before continuing. Add regression tests covering
separators followed by command tokens, including the cat/&& and grep/| examples,
and verify later command arguments are not extracted as filepaths.

@getappz
getappz merged commit c20aa47 into master Aug 7, 2026
21 of 23 checks passed
@getappz
getappz deleted the task/13 branch August 7, 2026 08:43
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