{"record":{"id":"ab3d0e898284dc9b","repo":"warpdotdev/warp","slug":"failed-to-parse-line-number-in-grep-output","errorCode":null,"errorMessage":"Failed to parse line number in Grep output: {:?}","messagePattern":"Failed to parse line number in Grep output: (.+?)","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"app/src/ai/blocklist/action_model/execute/grep.rs","lineNumber":663,"sourceCode":"    shell_launch_data: Option<ShellLaunchData>,\n    current_working_directory: Option<String>,\n) -> anyhow::Result<Vec<GrepFileMatch>> {\n    let mut matched_files = HashMap::new();\n\n    for line in output.trim().split(\"\\n\") {\n        let mut parts = line.split(\":\");\n        let file = parts.next();\n        let line_number = parts.next();\n\n        let (Some(file), Some(line_number)) = (file, line_number) else {\n            return Err(anyhow::anyhow!(\n                \"Failed to parse Grep output, unexpected format\"\n            ));\n        };\n        let line_number = match line_number.parse::<usize>() {\n            Ok(line_number) => line_number,\n            Err(e) => {\n                return Err(anyhow::anyhow!(\n                    \"Failed to parse line number in Grep output: {:?}\",\n                    e\n                ));\n            }\n        };\n\n        matched_files\n            .entry(file)\n            .or_insert_with(Vec::new)\n            .push(GrepLineMatch { line_number });\n    }\n\n    Ok(matched_files\n        .into_iter()\n        .map(|(file, matched_lines)| GrepFileMatch {\n            file_path: host_native_absolute_path(\n                file,\n                &shell_launch_data,","sourceCodeStart":645,"sourceCodeEnd":681,"githubUrl":"https://github.com/warpdotdev/warp/blob/e72fd7aacbbb2236d9b3be2aad7e7178fe94b4bc/app/src/ai/blocklist/action_model/execute/grep.rs#L645-L681","documentation":"The grep output parser found a file and a second colon-separated token, but that token failed to parse as usize (a line number). The underlying ParseIntError is embedded in the message, so the offending field's content can be inferred from the failing shape.","triggerScenarios":"The second ':'-separated field is not a number: Windows-style paths ('C:\\Users\\...' makes 'C' the file and the rest the 'line number'), grep diagnostics like 'grep: dir: No such file or directory' (file='grep', line=' dir'), or output where columns appear without -n (grep.rs:659-665).","commonSituations":"Running grep on Windows where the drive-letter colon shifts the fields; stderr diagnostics interleaved with matches; grep flavor that omits line numbers; filenames containing colons (e.g. timestamps).","solutions":["Always pass -n so line numbers are present, and --no-messages to suppress 'grep:' diagnostics","Pre-filter lines starting with 'grep:' or lacking a numeric second field instead of hard-failing","On Windows, strip or special-case the drive-letter prefix before splitting","Consider a delimiter that cannot appear in the file slot, or use grep's -z/NUL output for exact splitting"],"exampleFix":"// before\nlet line_number = match line_number.parse::<usize>() {\n    Ok(n) => n,\n    Err(e) => return Err(anyhow::anyhow!(\"Failed to parse line number in Grep output: {:?}\", e)),\n};\n\n// after\nlet line_number = match line_number.parse::<usize>() {\n    Ok(n) => n,\n    Err(_) => {\n        log::warn!(\"Skipping grep line with non-numeric line field: {line:?}\");\n        continue;\n    }\n};","handlingStrategy":"fallback","validationCode":null,"typeGuard":"fn parses_as_match(line: &str) -> Option<(&str, usize)> {\n    let mut p = line.splitn(3, ':');\n    let f = p.next()?;\n    let n = p.next()?.parse::<usize>().ok()?;\n    Some((f, n))\n}","tryCatchPattern":"match parse_grep_output(&output, shell, cwd).await {\n    Err(e) if e.to_string().contains(\"Failed to parse line number\") => {\n        parse_lenient(&output) // skip non-numeric lines, keep the rest of the matches\n    }\n    r => r,\n}","preventionTips":["Strip Windows drive-letter prefixes or use a NUL-delimited grep mode before splitting on ':'","Filter out 'grep:' diagnostic lines so they are never mistaken for match records","Ensure line numbers are present by always passing -n to the underlying grep"],"tags":["rust","warp","grep","parsing","windows","shell"],"backgroundTag":null,"analyzedSha":"e72fd7aacbbb2236d9b3be2aad7e7178fe94b4bc","analyzedAt":"2026-08-16T08:27:25.381Z","schemaVersion":2},"datasetVersion":"2026-08-16T13:17:31.715Z"}