{"record":{"id":"ae89bfee4f3eda7a","repo":"nikivdev/code","slug":"f-pr-preview-mode-requires-a-value","errorCode":null,"errorMessage":"`f pr preview --mode` requires a value","messagePattern":"`f pr preview --mode` requires a value","errorType":"validation","errorClass":null,"httpStatus":null,"severity":"error","filePath":"src/pr_preview.rs","lineNumber":285,"sourceCode":"    let mut repo_path = match opts.paths.len() {\n        0 => None,\n        1 => Some(PathBuf::from(&opts.paths[0])),\n        _ => bail!(\"`f pr preview --path` accepts at most one repo path override\"),\n    };\n    let mut requested_base = opts.base.clone();\n    let mut mode = opts.mode.unwrap_or(PrPreviewModeArg::Draft);\n    let mut json = opts.json;\n\n    let mut index = 1;\n    while index < args.len() {\n        match args[index].as_str() {\n            \"--json\" => {\n                json = true;\n                index += 1;\n            }\n            \"--mode\" => {\n                let Some(value) = args.get(index + 1) else {\n                    bail!(\"`f pr preview --mode` requires a value\");\n                };\n                mode = parse_mode_arg(value)?;\n                index += 2;\n            }\n            \"--base\" => {\n                let Some(value) = args.get(index + 1) else {\n                    bail!(\"`f pr preview --base` requires a value\");\n                };\n                requested_base = value.clone();\n                index += 2;\n            }\n            \"--path\" => {\n                let Some(value) = args.get(index + 1) else {\n                    bail!(\"`f pr preview --path` requires a value\");\n                };\n                repo_path = Some(PathBuf::from(value));\n                index += 2;\n            }","sourceCodeStart":267,"sourceCodeEnd":303,"githubUrl":"https://github.com/nikivdev/code/blob/a747e741ae92c09071d0ae946ab48488adcff1ce/src/pr_preview.rs#L267-L303","documentation":"The `--mode` flag of `f pr preview` requires a value (e.g. draft or feedback). This error is thrown when the flag is the last argument on the command line, so args.get(index + 1) returns None.","triggerScenarios":"Running `f pr preview --mode` with nothing following it, so no value can be consumed for the flag.","commonSituations":"Truncated command lines in shell scripts; forgetting to pass draft/feedback after --mode; shell quoting mistakes that drop the value.","solutions":["Append a value: `f pr preview --mode draft` (or `feedback`)","Check shell scripts for truncated or line-wrapped commands","Ensure the value is not accidentally consumed by quoting issues"],"exampleFix":"// before\nf pr preview --mode\n// after\nf pr preview --mode feedback","handlingStrategy":"validation","validationCode":"if args.iter().any(|a| a == \"--mode\") {\n    let i = args.iter().position(|a| a == \"--mode\").unwrap();\n    if args.get(i + 1).is_none() { anyhow::bail!(\"--mode needs a value\"); }\n}","typeGuard":null,"tryCatchPattern":"if let Err(e) = run_pr_preview(cmd) {\n    if e.to_string().contains(\"--mode`) requires a value\") {\n        eprintln!(\"Usage: f pr preview --mode draft|feedback\");\n    }\n}","preventionTips":["Always pass draft or feedback after --mode","Check scripts for trailing flags at end of line","Avoid empty shell variables adjacent to flags"],"tags":["cli","argument-parsing","pr"],"backgroundTag":"missing-argument-value","analyzedSha":"a747e741ae92c09071d0ae946ab48488adcff1ce","analyzedAt":"2026-09-01T22:43:55.719Z","contentChangedAt":null,"schemaVersion":2},"datasetVersion":"2026-09-08T10:18:20.063Z"}