Function load_json_file_strict

src/agents/mod.rs:464–482

Load a JSON file for **editing**. Unlike [`load_json_file`], this returns an error if the file exists but cannot be parsed, preventing silent data loss when the modified value is written back. # Error conditions - File exists but is not readable (permissions, I/O error). - File exists and has content but contains invalid JSON. Returns `Ok(json!({}))` only when the file does not exist or is empty

(path: &Path)

/// Returns `Ok(json!({}))` only when the file does not exist or is empty,
/// which is safe for creating a new config from scratch.
pub fn load_json_file_strict(path: &Path) -> Result<serde_json::Value> {
    if !path.exists() {
        return Ok(serde_json::json!({}));
    }
    let contents = std::fs::read_to_string(path).map_err(|e| TraceDecayError::Config {
        message: format!("cannot read {}: {e}", path.display()),
    })?;
    if contents.trim().is_empty() {
        return Ok(serde_json::json!({}));
    }
    serde_json::from_str(&contents).map_err(|e| TraceDecayError::Config {
        message: format!(
            "cannot parse {} as JSON: {e}\n  \
             Hint: fix the JSON syntax manually and re-run the command,\n  \
             or delete the file to start fresh",
            path.display()
        ),
    })
}

/// Create a backup copy of a config file before modifying it.
///