conch-runtime 0.1.2

A library for evaluating/executing programs written in the shell programming language.
Documentation 
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use env::StringWrapper;
use eval::Fields;

mod alternative;
mod assign;
mod default;
mod error;
mod len;
mod remove;
mod split;

pub use self::alternative::{alternative, Alternative};
pub use self::assign::{assign, Assign};
pub use self::default::{default, EvalDefault};
pub use self::error::{error, Error};
pub use self::len::len;
pub use self::remove::{remove_largest_prefix, remove_largest_suffix,
                       remove_smallest_prefix, remove_smallest_suffix};
pub use self::remove::{RemoveLargestPrefix, RemoveLargestSuffix,
                       RemoveSmallestPrefix, RemoveSmallestSuffix};
pub use self::split::{Split, split};

/// Determines if a `Fields` variant can be considered non-empty/non-null.
///
/// If `strict = false`, then fields are considered present as long as they
/// aren't `None`.
///
/// If `strict = true`, then fields are considered present as long as there
/// exists at least one field that is not the empty string.
fn is_present<T: StringWrapper>(strict: bool, fields: Option<Fields<T>>) -> Option<Fields<T>> {
    fields.and_then(|f| {
        if f.is_null() {
            if strict {
                None
            } else {
                Some(Fields::Zero)
            }
        } else {
            Some(f)
        }
    })
}