{"record":{"id":"c42d79574daf0316","repo":"GitoxideLabs/gitoxide","slug":"an-undo-operation-title-cannot-be-empty","errorCode":null,"errorMessage":"an undo operation title cannot be empty","messagePattern":"an undo operation title cannot be empty","errorType":"validation","errorClass":null,"httpStatus":null,"severity":"error","filePath":"gix-tix/src/edit/undo.rs","lineNumber":670,"sourceCode":"    }\n    if let Some(hex) = value.strip_prefix(b\"object:\") {\n        let id = ObjectId::from_hex(hex).context(\"an undo object ID is invalid\")?;\n        ensure!(\n            id.kind() == repo.object_hash(),\n            \"an undo object ID uses the wrong hash kind\"\n        );\n        return Ok(State::Object(id));\n    }\n    if let Some(name) = value.strip_prefix(b\"symbolic:\") {\n        return FullName::try_from(name.as_bstr())\n            .map(State::Symbolic)\n            .context(\"an undo symbolic target is invalid\");\n    }\n    bail!(\"an undo reference state has an unknown encoding\")\n}\n\nfn validate_title(title: &str) -> Result<()> {\n    ensure!(!title.is_empty(), \"an undo operation title cannot be empty\");\n    ensure!(\n        !title.as_bytes().iter().any(|byte| matches!(byte, b'\\n' | b'\\r')),\n        \"an undo operation title must be one line\"\n    );\n    Ok(())\n}\n\nfn retention_parents(repo: &gix::Repository, predecessor: ObjectId, changes: &[RefChange]) -> Result<Vec<ObjectId>> {\n    let mut parents = vec![predecessor];\n    let mut seen = HashSet::from([predecessor]);\n    for id in changes\n        .iter()\n        .flat_map(|change| [&change.before, &change.after])\n        .filter_map(|state| match state {\n            State::Object(id) => Some(*id),\n            State::Missing | State::Symbolic(_) => None,\n        })\n    {","sourceCodeStart":652,"sourceCodeEnd":688,"githubUrl":"https://github.com/GitoxideLabs/gitoxide/blob/e73179060badf27222d790981fac3f84c1830a7e/gix-tix/src/edit/undo.rs#L652-L688","documentation":"`validate_title` in gix-tix's undo module rejects empty titles for undo operations. Undo queue commits use their commit title to describe the operation, and an empty title would produce an invalid/uninformative commit. The library throws this when recording, writing, or parsing an undo commit whose title is empty.","triggerScenarios":"Calling `record`, `write_commit`, or `parse_commit` with an empty `title: \"\"` string for an undo operation.","commonSituations":"Programmatic callers building undo records from user input or parsed data that yielded an empty title (e.g. an empty commit message, trimmed whitespace-only title, or a missing CLI argument defaulting to an empty string).","solutions":["Provide a non-empty title string when recording or writing the undo operation","Trim user-supplied titles and check `title.is_empty()` before calling the API, returning a user-facing error instead","If the title came from a parsed commit, fall back to a default title like the START_TITLE constant when parsing yields an empty string"],"exampleFix":"// before\nundo.record(repo, \"\")?;\n// after\nlet title = raw_title.trim();\nanyhow::ensure!(!title.is_empty(), \"undo title required\");\nundo.record(repo, title)?;","handlingStrategy":"validation","validationCode":"fn ensure_valid_title(title: &str) -> Result<(), String> {\n    if title.is_empty() { Err(\"undo title must not be empty\".into()) } else { Ok(()) }\n}","typeGuard":null,"tryCatchPattern":null,"preventionTips":["Trim and check titles before calling record/write_commit","Never pass raw multi-field user input as a title","Default to a generated descriptive title when input is blank"],"tags":["validation","git","undo"],"backgroundTag":"empty-required-field","analyzedSha":"e73179060badf27222d790981fac3f84c1830a7e","analyzedAt":"2026-09-08T11:26:50.865Z","contentChangedAt":"2026-09-08T11:26:50.865Z","schemaVersion":2},"datasetVersion":"2026-09-15T23:17:13.987Z"}