{"record":{"id":"2003f5fd72b9e4b4","repo":"slint-ui/slint","slug":"failed-to-convert-path-to-url","errorCode":null,"errorMessage":"Failed to convert path to URL","messagePattern":"Failed to convert path to URL","errorType":"exception","errorClass":"std::io::Error","httpStatus":null,"severity":"error","filePath":"tools/editor/preview.rs","lineNumber":2041,"sourceCode":"/// Otherwise the file is indeed missing.\n///\n/// In any way, register it as a dependency\nfn get_url_from_cache(url: &Url) -> std::io::Result<(SourceFileVersion, String)> {\n    PREVIEW_STATE.with_borrow_mut(|preview_state| {\n        preview_state.dependencies.insert(url.to_owned());\n\n        preview_state.source_code.get(url).map(|r| (r.version, r.code.clone())).ok_or(\n            std::io::Error::new(\n                std::io::ErrorKind::NotFound,\n                \"File not registered in Live-Preview!\",\n            ),\n        )\n    })\n}\n\nfn get_path_from_cache(path: &Path) -> std::io::Result<(SourceFileVersion, String)> {\n    let url = Url::from_file_path(path).map_err(|()| {\n        std::io::Error::new(std::io::ErrorKind::NotFound, \"Failed to convert path to URL\")\n    })?;\n    get_url_from_cache(&url)\n}\n\n#[derive(Copy, Clone, Debug, PartialEq, Eq)]\npub enum LoadBehavior {\n    /// We reload the preview, most likely because a file has changed\n    Reload,\n    /// Load the preview and make the window visible if it wasn't already.\n    LoadWithoutLiveData,\n    /// We show the preview because the user asked for it. The UI should become visible and focused if it wasn't already\n    BringWindowToFront,\n}\n\npub fn reload_preview() {\n    let pc = PREVIEW_STATE\n        .with_borrow(|preview_state| preview_state.current_previewed_component.clone());\n","sourceCodeStart":2023,"sourceCodeEnd":2059,"githubUrl":"https://github.com/slint-ui/slint/blob/3a7e700487dc74d404cad0726378053ab763d4e0/tools/editor/preview.rs#L2023-L2059","documentation":"`get_path_from_cache` converts a filesystem path to a `file://` URL with `Url::from_file_path` before consulting the source cache. Only absolute paths can be converted; relative paths (or paths with a non-root base like Windows drive-less paths) make the conversion fail, reported as `NotFound`.","triggerScenarios":"`get_path_from_cache(&path)` is called with a relative `Path` (e.g. derived from a compiler import string or a user-supplied relative path), so `Url::from_file_path` returns `Err(())`.","commonSituations":"A relative import path propagated straight from the .slint source; running the tool with a CWD different from what the caller assumed; paths built via `PathBuf::from(\"relative/file.slint\")` without canonicalization.","solutions":["Canonicalize the path to absolute before calling `get_path_from_cache`: `std::fs::canonicalize(path)`","If the file may not exist on disk, build the absolute path from a known base directory (`base.join(rel)`) then convert","Confirm the path the loader receives is absolute; if the origin is an import string, resolve it against the importing file's directory first"],"exampleFix":"// before\nlet r = get_path_from_cache(Path::new(\"ui/main.slint\"))?;\n// after\nlet abs = std::fs::canonicalize(\"ui/main.slint\")?;\nlet r = get_path_from_cache(&abs)?;","handlingStrategy":"validation","validationCode":"if !path.is_absolute() {\n    let path = std::fs::canonicalize(path).map_err(|e| std::io::Error::new(std::io::ErrorKind::NotFound, e))?;\n}\nlet url = Url::from_file_path(path).map_err(|()| std::io::Error::new(std::io::ErrorKind::NotFound, \"Failed to convert path to URL\"))?;","typeGuard":"fn to_file_url(p: &std::path::Path) -> Option<Url> {\n    if p.is_absolute() { Url::from_file_path(p).ok() } else { None }\n}","tryCatchPattern":"match get_path_from_cache(&path) {\n    Ok(result) => result,\n    Err(e) if e.kind() == std::io::ErrorKind::NotFound => {\n        let abs = std::fs::canonicalize(&path)?;\n        get_path_from_cache(&abs)\n    }\n    Err(e) => Err(e),\n}","preventionTips":["Never pass user- or compiler-supplied relative paths straight into URL conversion; canonicalize first","Establish a single base directory and join relative paths against it before lookup","Log the input path when conversion fails so misconfigured CWDs are spotted quickly"],"tags":["io","paths","url","live-preview"],"backgroundTag":"invalid-url-format","analyzedSha":"3a7e700487dc74d404cad0726378053ab763d4e0","analyzedAt":"2026-09-16T01:37:20.251Z","contentChangedAt":"2026-09-16T01:37:20.251Z","schemaVersion":2},"datasetVersion":"2026-09-23T08:17:48.524Z"}