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use gix_error::Result;
use std::ffi::OsString;
use crate::{Defaults, MagicSignature, SearchMode};
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> {
let mut env_bool = |name: &str| -> Result<Option<bool>> {
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(gix_error::message("Glob and no-glob settings are mutually exclusive").validation_error())
} else {
Ok(SearchMode::Literal)
}
})
.transpose()?
.unwrap_or(search_mode);
Ok(Defaults {
signature,
search_mode,
literal,
})
}
}