use std::ffi::OsString; use crate::{Defaults, MagicSignature, SearchMode}; ///pub mod from_environment {    /// The error returned by [Defaults::from_environment()](super::Defaults::from_environment()).    #[derive(Debug, thiserror::Error)]    #[expect(missing_docs)]    pub enum Error {        #[error(transparent)]        ParseValue(#[from] gix_config_value::Error),        #[error("Glob and no-glob settings are mutually exclusive")]        MixedGlobAndNoGlob,    }} impl Defaults {    /// Initialize this instance using information from the environment as    /// [per the official documentation](https://git-scm.com/book/en/v2/Git-Internals-Environment-Variables) *(look for `PATHSPECS`)*,    /// calling `var(variable_name)` for each variable that should be obtained.    ///    /// Used environment variables are `GIT_GLOB_PATHSPECS`, `GIT_NOGLOB_PATHSPECS`, `GIT_LITERAL_PATHSPECS` and `GIT_ICASE_PATHSPECS`.    /// Note that there are lot of failure modes, and instead of offering lenient parsing, the caller may ignore errors and    /// use other defaults instead.    ///    /// ### Deviation    ///    /// Instead of failing if `GIT_LITERAL_PATHSPECS` is used with glob globals, we ignore these. Also our implementation allows global    /// `icase` settings in combination with this setting.    pub fn from_environment(var: &mut dyn FnMut(&str) -> Option<OsString>) -> Result<Self, from_environment::Error> {        let mut env_bool = |name: &str| -> Result<Option<bool>, gix_config_value::Error> {            var(name)                .map(|val| gix_config_value::Boolean::try_from(val).map(|b| b.0))                .transpose()        };         let literal = env_bool("GIT_LITERAL_PATHSPECS")?.unwrap_or_default();        let signature = env_bool("GIT_ICASE_PATHSPECS")?            .and_then(|val| val.then_some(MagicSignature::ICASE))            .unwrap_or_default();        if literal {            return Ok(Defaults {                signature,                search_mode: SearchMode::Literal,                literal,            });        }        let glob = env_bool("GIT_GLOB_PATHSPECS")?;        let mut search_mode = glob            .and_then(|glob| glob.then_some(SearchMode::PathAwareGlob))            .unwrap_or_default();        search_mode = env_bool("GIT_NOGLOB_PATHSPECS")?            .map(|no_glob| {                if glob.unwrap_or_default() && no_glob {                    Err(from_environment::Error::MixedGlobAndNoGlob)                } else {                    Ok(SearchMode::Literal)                }            })            .transpose()?            .unwrap_or(search_mode);         Ok(Defaults {            signature,            search_mode,            literal,        })    }}