shellexpand-fork 2.1.2

Shell-like expansions in strings

shellexpand, a library for shell-like expansion in strings

NOTE: THIS CRATE NAME IS RETIRED. There will no further updates beyond 2.1.2. Please switch to shellexpand, which will continue to be developed.

shellexpand is a single dependency library which allows one to perform shell-like expansions in strings, that is, to expand variables like $A or ${B} into their values inside some context and to expand ~ in the beginning of a string into the home directory (again, inside some context).

This crate provides generic functions which accept arbitrary contexts as well as default, system-based functions which perform expansions using the system-wide context (represented by functions from std::env module and dirs crate).

Note: This package was a fork of Vladimir Matveev's library. This fork existed due to a hiatus in maintenance. Please use shellexpand instead now.

Alternatives to this crate:

  • expanduser: Tilde substitution only. Supports ~user which this crate currently does not (although we hope to).
  • envsubst: Does not do offer tildeexpansion. Only supports certain concrete types (eg HashMap for variable map).
  • expand_str: Uses %..% syntax. Does not offer tilde expansion. Variable lookups can only be infallible.
  • tilde_expand: Only does tilde expansion, on bytes ([u8]).


Add a dependency in your Cargo.toml.

To avoid having to write use shellexpand_fork as shellexpand or similar, rename the package on import:

shellexpand = { version = "2.1", package = "shellexpand-fork" }

See the crate documentation (a link is present in the beginning of this readme) for more information and examples.


Version 2.1.2

Minor changes:

  • README: direct people back to shellexpand
  • List alternatives to this crate.
  • Switch back to dirs from dirs-next.
  • Improve linking in docs and fix broken links and badges.
  • Apply some proposals from cargo fix.

Version 2.1.1

Version 2.1.0

  • Switched to dirs-next instead of the obsolete dirs as the underlying dependency used to resolve the home directory
  • Switched to GitHub Actions instead of Travis CI for building the project.

Version 2.0.0

  • Added support for default values in variable expansion (i.e. ${ANSWER:-42})
  • Breaking changes (minimum Rust version is now 1.30.0):
    • Using dyn for trait objects to fix deprecation warning
    • Switched to using source() instead of cause() in the Error implementation, and therefore added a 'static bound for the generic error parameter E

Version 1.1.1

  • Bump dirs dependency to 2.0.

Version 1.1.0

  • Changed use of deprecated std::env::home_dir to the dirs::home_dir function

Version 1.0.0

  • Fixed typos and minor incompletenesses in the documentation
  • Changed home_dir argument type for tilde expansion functions to FnOnce instead FnMut
  • Changed LookupError::name field name to var_name

Version 0.1.0

  • Initial release


This program is licensed under either of

at your option.


Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.