Unreleased

Revamp toolchain resolution and storage
- Toolchain references are now always resolved to a fixed <owner>/<repo>:<version> format before downloading, resolving the issue of having the same toolchain installed as e.g. stable, v4.9.0, and leanprover/lean4:v4.9.0 and ensuring that e.g. stable has the same meaning for everyone at a given point in time.
- Accordingly, elan update has been removed as updates of non-fixed toolchains are now implicit.
- This also fixes lake +stable new ... putting an unadvisable leanprover/lean4:stable reference in lean-toolchain.
- The configured default toolchain name is stored unresolved (and not immediately installed) but is resolved before every use. This also means that passing --default-toolchain none to the elan install script is not necessary anymore to speed up installation.
- In case of a network error resolving a toolchain, elan falls back to the previous resolution if any and prints a warning.
- The update-hashes/ directory is not used anymore, deleting toolchains/ or direct subdirectories does not break elan anymore.
More useful download and installation info messages
Experimental elan toolchain gc command. See elan toolchain gc --help for documentation. lean-toolchain files will only be known to the GC after being used at least once with this version of elan.

3.1.1 - 2024-02-22

Fix update check

3.1.0 - 2024-02-19

Fix partial toolchains potentially being left in place when unpacking is aborted (#121)
Check for elan updates during toolchain downloads (#122)

3.0.0 - 2023-09-08

Default to stable toolchain again in time for first Lean 4 stable release (#104)

2.0.1 - 2023-07-24

Fix download progress display on Windows (#101)

2.0.0 - 2023-07-03

Support toolchain reference <origin>:lean-toolchain that refers to the toolchain referred to by the contents of the given GitHub file (#99)
Default to Lean 4 (#98)

1.4.6 - 2023-06-10

Avoid dependency on the VC++ Redistributable on Windows (#97)

1.4.5 - 2023-04-26

Fix self update on Apple Silicon (only?) (#78)

1.4.4 - 2023-04-24

Update dependencies

1.4.3 - 2023-04-24

Avoid setting (DY)LD_LIBRARY_PATH (#90)

1.4.2 - 2022-09-13

Fix downloading Lean releases again

1.4.1 - 2022-04-15

Added

Actual support for ARM64 macOS (M1)

1.4.0 - 2022-03-28

Added

Support for ARM64 macOS (M1)

1.3.1 - 2021-11-01

Changed

Update dependencies

1.3.0 - 2021-11-01

Added

Support for zstd-compressed tarballs

1.2.0 - 2021-10-19

Added

Support for ARM64 Linux

1.1.2 - 2021-10-15

Changed

Remove another "press any key to exit"

1.1.1 - 2021-10-15

Changed

Remove "press any key to exit" step from Windows installation not needed for VS Code or PowerShell method

1.1.0 - 2021-10-08

Added

Add lake Lean 4 executable

1.0.8 - 2021-09-10

Changed

Fix elan self update on not-Linux, again

1.0.7 - 2021-08-16

Changed

Default to respective toolchain inside of ~/.elan (#36)

1.0.6 - 2021-05-25

Changed

Fix elan self update on not-Linux and build from cmdline

1.0.5 - 2021-05-25

Changed

Run extension-less tools such as leanc using sh on Windows (and hope for the best...)

1.0.4 - 2021-05-24

Changed

Update suggestion when no default toolchain is configured (#31)
Fix elan show when no default toolchain is configured (#33)

1.0.3 - 2021-04-30

Changed

Fix elan self update download URL on Linux

1.0.2 - 2021-04-28

Changed

Fix installation from non-default repos

1.0.1 - 2021-04-28

Changed

Fix updating channels from non-default repos (e.g. leanprover/lean4:nightly) This change affects the store location of such toolchains, so you will have to re-install them first.
```
$ elan toolchain uninstall leanprover-lean4-nightly
$ elan toolchain install leanprover/lean4:nightly
```

1.0.0 - 2021-04-17

Move to leanprover/elan

0.11.0 - 2021-03-09

Changed

Make elan a static executable on Linux
Improve leanpkg.toml error handling (#26)
Make downloaded files read-only (on Linux/macOS) (#27)

0.10.3 - 2021-01-15

Changed

Hopefully fix Lean 4 leanpkg on Windows

0.10.2 - 2020-05-11

Changed

Hopefully actually restore elan toolchain link functionality

0.10.1 - 2020-05-11

Changed

Hopefully restore elan toolchain link functionality

0.10.0 - 2020-05-08

Changed

Accept (almost) arbitrary release tag names in addition to version numbers

0.9.0 - 2020-05-07

Added

Add leanc, leanmake Lean 4 executables

0.8.0 - 2020-03-06

Changed

stable/nightly now refer to leanprover-community, Lean's community fork. This includes the toolchain installed by default (stable).

0.7.5 - 2019-03-21

Changed

Fix release lookup once more with feeling

0.7.4 - 2019-03-20

Changed

Fix self-update always triggering

0.7.3 - 2019-03-20

Changed

Fix lookup of latest Github release of both Lean and elan

0.7.2 - 2019-01-15

Changed

Fix name check in elan toolchain link (#17)

0.7.0 - 2018-09-16

Added

elan will now warn if there are other Lean installations in the PATH before installing

Changed

Fix mtimes not being restored from installation archives
Fix invoking leanpkg on Windows

0.6.0 - 2018-08-01

Added

Version specifiers can now point to custom forks of Lean, such as khoek/klean:3.4.1 (#8)

0.5.0 - 2018-04-20

Changed

An explicit version passed to a proxy command like in leanpkg +nightly build will now be installed automatically when necessary
Full toolchain names and their directories do not mention the operating system (the "target triple", to be exact) any more. You may want to delete your old toolchains from ~/.elan/toolchains to save space.

[0.4.0 - 2018-04-17]

Changed

leanpkg.toml and lean-toolchain files can now reference custom toolchains (those added by elan toolchain link)

[0.3.0] - 2018-04-11

Added

leanchecker proxy

[0.2.0] - 2018-04-11

Added

curl | sh installation and instructions

Changed

Fix elan toolchain link (#1)
Fix self-update
De-rustify docs

[0.1.0] - 2018-04-10

Minimum viable product release

Added

Building on Rustup's code, implement installing and managing Lean toolchains
Have leanpkg.toml files override the Lean version